Biogeochemistry Tag
Biogeochemistry is one of more than 16 discipline tags that we use to categorize and aggregate our interdisciplinary information within and across CZOs. Much of our information has been tagged with 2-3 disciplines.
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Calhoun People - Biogeochemistry
21 People
Cross-CZO COLLABORATOR
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ecology, soil microbial ecology, biogeochemistry, invasion ecology
INVESTIGATOR
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pedology & anthropedology, terrestrial biogeochemistry, forest ecology, non-traditional isotopes
INVESTIGATOR
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KU
stable isotope biogeochemistry; terrestrial ecosystem ecology; land use change; SOM & N2O dynamics.
INVESTIGATOR, PostDoc
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Water Resources, Environmental Engineering
INVESTIGATOR
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UGA
accelerator mass spectrometry; radiocarbon dating; soil chemistry
STAFF, Data Manager, Field Manager
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Duke
ecology, natural history
GRAD STUDENT
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KU
Biogeochemistry
GRAD STUDENT
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KU
Biogeochemistry, soil ecology, nitrogen cycling
Cross-CZO GRAD STUDENT
PhD Student (Shale Hills CZO), MS student alumna (Calhoun CZO)
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Biogeochemistry
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Geochemistry and Soil Sciences
GRAD STUDENT
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Duke
watershed hydrology, biogeochemistry
INVESTIGATOR
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soil site productitvity, nutrient and hydrologic cycles, land use change, biogeochemistry
Cross-CZO INVESTIGATOR
.(JavaScript must be enabled to view this email address), 919 684 1743
DU Nicholas School
Hydrology
COLLABORATOR
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Ecosystems Ecology, Ecosystem Services, Grassland Ecology, Soil carbon sequestration, Forest Carbon
.(JavaScript must be enabled to view this email address), 919 613 8031
Pedology, biogeochemistry
GRAD STUDENT
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UGA
Soil Science
Cross-CZO INVESTIGATOR, Visiting/Affiliate, COLLABORATOR
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KU
Hydrogeochemistry
STAFF
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UGA
Wetland Ecology
Cross-CZO INVESTIGATOR, COLLABORATOR
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UGA
Soil biogeochemistry
GRAD STUDENT
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DU Nicholas School
Soil Biogeochemistry and Hydrology
GRAD STUDENT
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UGA
Biogeochemistry
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Calhoun Research Groups - Biogeochemistry
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Calhoun Data - Biogeochemistry
Calhoun Critical Zone Observatory - Soil Moisture - Hydroprobe (2016-2018)
1 components • Calhoun CZO Research Area 1, Calhoun CZO Research Area 4, Calhoun CZO Research Area 7 • Hydrology, Biogeochemistry, Soil Science / Pedology • Austin, Jason C.; Brecheisen, Zachary S.; Cook, Charles W.; Heine, Paul R.; Richter, Daniel deB.Calhoun CZO - Soil Geochemistry - Soil organic matter transformations (2015)
1 components • Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas • Biogeochemistry, Biology / Ecology, Soil Science / Pedology • Min, K.; Flournoy, R.; Heroneme, C.; Barger, K.; Lehmeier, C.A.; Heine, P.; Richter, Daniel deB.; Billings, S.A.Calhoun CZO - Soil Geochemistry - Mössbauer spectroscopy (2015)
1 components • Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas • Biogeochemistry, Soil Science / Pedology • Thompson, Aaron; Richter, Daniel deB.; Wilmoth, Jared; Barcellos, DiegoCalhoun CZO - Soil Biogeochemistry (2015-2016)
1 components • Calhoun CZO Research Area 1, Calhoun CZO Research Area 2, Calhoun CZO Research Area 7, Calhoun CZO Research Area 8 • Biogeochemistry, Biology / Ecology, Soil Science / Pedology • Sharon Billings; Christoph Lehmeier; Kyungjin Min; Samik Bagchi; Emma Hauser; Keelan Barger; Samantha Elledge; Rebecca Flournoy; Carl Heroneme; Hanna Rankin; Rena StairCalhoun Experimental Watersheds 2, 3, 4 - Soil Moisture, Soil Redox Potential (2014-2015)
1 components • Calhoun Experimental Forest and Eco-hydrology Experiments • Biogeochemistry, Soil Science / Pedology • Caitlin Hodges; Daniel Markewitz; Aaron ThompsonCalhoun Long Term Soil Experiment - Soil Gas (1992-1996)
1 components • Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas • Soil Science / Pedology, Biogeochemistry • Markewitz, Daniel; Richter, Daniel deB.Calhoun Long-Term Soil Experiment - Soil Geochemistry - 70-m deep borehole (2010)
1 components • Calhoun Long-Term Soil-Ecosystem Plots and Reference Areas • Biogeochemistry, Geochemistry / Mineralogy, Soil Science / Pedology • Bacon, A.R.; Richter, Daniel deB.National - Soil Gas - CO2 and O2 (2014-2017)
2 components • Bigelow Site (High-Elevation), Jemez 2013 Burned ZOB, Jemez Unburned Site, Calhoun CZO Research Area 1, Garner Run - Sandstone Forested, Northeastern Puerto Rico and the Luquillo Mountains • Biogeochemistry, Climatology / Meteorology, Soil Science / Pedology, Biology / Ecology • Brecheisen, Zachary; Chorover, Jon; Kaye, Jason; Silver, Whendee; Abramson, Nate; Barron-Gafford, Greg; Condon, Katherine E.; Cook, Charles W.; Hill, Lillian; Losleben, Mark; Minor, Rebecca; O'Connell, Christine; Richter, Daniel deB.; Durcik, MatejR1 - Soil Biogeochemistry - Carbon isotopes (2016)
1 components • Calhoun CZO Research Area 1 • Soil Science / Pedology, Biogeochemistry • Cherkinsky, AlexanderResearch area 1 - Soil Gas, Soil Moisture, Soil Temperature (2016-2019)
1 components • Calhoun CZO Research Area 1 • Biogeochemistry, Soil Science / Pedology, Hydrology • Brecheisen, Z. S.; Cook, Charles W.; Richter, Daniel deB.Research areas 1, 4, 7 - Soil Gas (2015-2017)
2 components • Calhoun CZO Research Area 1, Calhoun CZO Research Area 4, Calhoun CZO Research Area 7 • Biogeochemistry, Soil Science / Pedology • Brecheisen, Z. S.; Cook, Charles W.; Richter, Daniel deB.Shale Hills, Boulder, Luquillo, JRB-SCM, Calhoun - Soil Geochemistry (2001-2013)
1 components • Susquehanna Shale Hills Critical Zone Observatory, Bisley, Boulder Creek Watershed, Northeastern Puerto Rico and the Luquillo Mountains, Santa Catalina Mountains • Geochemistry / Mineralogy, Biogeochemistry • Niu, Xianzeng; Williams, Jennifer; Brantley, Susan L.; Miller, Doug; Bills, Brian -
Calhoun Models - Biogeochemistry
CN reforest dynamics
Coupled dynamics of tree and soil C and N during reforestation following land abandonment
Calhoun reforestation was unique: 30% biomass was lost after age 35. Models are used to explore explanations of this behavior.
Plant-soil feedback
Bistable plant-soil dynamics and biogenic controls on the soil production function
A coupled soil-plant model was developed, exhibiting bistability driven by positive feedback between vegetation and soil.
tRIBS-ECO
Triangulated Irregular Network-based Real-time Integrated Basin Simulator-Erosion and C Oxidatition
Spatially- and depth-explicit physically-based model of hydro-geomorphic processes and of soil organic carbon dynamics.
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Calhoun Publications - Biogeochemistry
2020
Working across scales to project soil biogeochemical responses to climate. Billings, S.A., Sullivan, P.L. (2020): In: Yang, Y., Keiluweit, M., Senesi, N., Xing, B., eds. Multi-Scale Biogeochemical Processes in Soil Ecosystems: Critical Reactions and Resilience to Climate Changes, Vol. 5 in IUPAC Series on Biophysico-Chemical Processes in Environmental Systems, Wiley
2020
The Influence of Native Soil Organic Matter and Minerals on Ferrous Iron Oxidation. Chen, Chunmei, and Aaron Thompson (2020): ASA-CSSA-SSSA International Annual Meeting, 9-13 November 2020
2020
Persistent anthropogenic legacies structure depth dependence of regenerating rooting systems and their functions. Hauser, Emma, Daniel D. Richter, Daniel Markewitz, Zachary Brecheisen, and Sharon A. Billings (2020): Biogeochemistry 147: 259-275
2020
Limited carbon contents of centuries old soils forming in legacy sediment. Wade, A., D.D. Richter, A. Cherkinsky, C.B. Craft, P.R. Heine (2020): Geomorphology 354: 107018
2020
Bioavailability of Phosphorus to Loblolly Pine (Pinus taeda L) and Red Maple (Acer rubrum L) in Clay and Saprolite from the Southeastern Piedmont, USA. Wang, Zhine, Aaron Thompson, Lori Sutter, and Daniel Markewitz (2020): ASA-CSSA-SSSA International Annual Meeting, 9-13 November 2020
2019
Biological Cycling of Potassium by Roots as a Control on Mixed-layer Clays. Austin, Jason, Paul A Schroeder, Daniel deB. Richter (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
Length of Oxygen Exposure during Redox Oscillations Affects Rates of Iron Reduction, Anaerobic Carbon Mineralization, and Methane Emissions. Barcellos, Diego, Ashley Campbell, Jennifer Pett-Ridge, Aaron Thompson (2019): Soil Science Society of America International Soils Meeting, San Diego, CA, 6-9 January 2019
2019
Anthropogenic Declines in Deep Roots Constrain Deep Soil Organic Carbon Forms and Fluxes. Billings, Sharon A, Pamela L Sullivan, Ligia Souza, Emma Hauser, Terry Loecke, Kyler Lang, Charles W Rice, Daniel Hirmas, Daniel deB. Richter, Alexander Cherkinsky, Daniel Markewitz (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
Distinct contributions of eroding and depositional profiles to land-atmosphere CO2 exchange in two contrasting forests. Billings, Sharon A., Daniel de B. Richter, Susan E. Ziegler, Karen Prestegaard, and Anna M. Wade (2019): Frontiers in Earth Science 7: article 36
2019
Development and deployment of a field-portable soil O2 and CO2 gas analyzer and sampler. Brecheisen, Zachary S., Charles W. Cook, Paul R. Heine, Junmo Ryang, Daniel deB. Richter (2019): PLoS ONE 14(8): e0220176
2019
The Multiscale Signature of Ecohydrological Fluctuations on Soil Biogeochemical Cycles. Calabrese, Salvatore (2019): PhD dissertation, Princeton University
2019
Impact of ecohydrological fluctuations on iron-redox cycling. Calabrese, Salvatore, and Amilcare Porporato (2019): Soil Biology and Biochemistry 133: 188-195 Cross-CZO
2019
Know your water, know your soil, know your worms? – Earthworms and biogeochemistry at the margins of North American freshwater. Callaham, M.A., Jr., R.R. Carrera-Martínez, and M.K. Taylor (2019): Society for Freshwater Science annual meeting, Salt Lake City, Utah, May 2019
2019
Influence of earthworms (Oligochaeta: Sparganophilidae) on decomposition of riparian leaf litter. Carrera-Martínez, R.R., M.K. Taylor, D. Markewitz, L.A. Sutter, and M.A. Callaham, Jr. (2019): Society for Freshwater Science annual meeting, Salt Lake City, Utah, May 2019
2019
Dynamics of Soil Phosphorus Fractions over 60 Years of Forest Development. Foroughi, Maryam, Daniel Richter, and Daniel Markewitz (2019): Soil Science Society of America International Soils Meeting, San Diego, CA, 6-9 January 2019
2019
Modeling Phosphorus Losses and Distribution in Different Land Uses over Time. Foroughi, Maryam, John Mallard, Daniel Markewitz (2019): ASA-CSSA-SSSA International Annual Meeting, 10-13 Nov. 2019, San Antonio, Texas
2019
Seasonal and spatial variation in the potential for iron reduction in soils of the Southeastern Piedmont of the US. Hodges, Caitlin, John Mallard, Daniel Markewitz, Diego Barcellos, AaronThompson (2019): CATENA 180: 32-40
2019
How to estimate statistically detectable trends in a time series: A study of soil carbon and nutrient concentrations at the Calhoun LTSE. Mobley, M.L., Y. Yang, R.D. Yanai, K.A. Nelson, A.R. Bacon, P.R. Heine, and D.D. Richter (2019): Soil Science Society of America Journal 83(s1): S133-S140
2019
Bioavailability of carbon in ferrihydrite-organic matter coprecipitates transformed by Fe (II)-catalyzed recrystalization. Noor, Nadia, Aaron Thompson, Zhe Zhou, Drew E. Latta, Michelle M. Scherer, Alain F. Plante, and Thomas Borch (2019): Soil Science Society of America International Soils Meeting, San Diego, CA, 6-9 January 2019
2019
Effect of Reaction Time of Fe (II) with Different C/Fe Ratio Containing Ferrihydrite-Natural Organic Matter Coprecipitate on the Bioavailability of Carbon. Noor, Nadia, Zhe Zhou, Drew E. Latta, Michelle M. Scherer, Alain F. Plante, Thomas Borch, and Aaron Thompson (2019): ASA-CSSA-SSSA International Annual Meeting, 10-13 Nov. 2019, San Antonio, Texas
2019
Dynamic evolution of the soil pore size distribution and its connection to soil management and biogeochemical processes. Pelak, Norman, and Amilcare Porporato (2019): Advances in Water Resources 131, 103384
2019
How to Estimate Statistically Detectable Trends in a Time Series: A Study of Soil Carbon and Nutrient Concentrations at the Calhoun LTSE (Invited). Richter, Daniel deB., Megan L. Mobley, Yang Yang, Kevin A. Nelson, Allan R Bacon, Paul Heine (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
Controls of iron abundance and crystallinity on organomineral associations under contrasting long-term land use. Thompson, Aaron, Elizabeth K Coward, Daniel Markewitz, Daniel deB. Richter, Allan R Bacon, Alain F Plante (2019): American Geophysical Union Fall Meeting, San Francisco, CA, December 9-13, 2019
2019
Saturated but Not Yet Suffocated: Seasonal Oxidation-Reduction Dynamics in Southern Piedmont Floodplains. Wade, Anna, Daniel Richter (2019): ASA-CSSA-SSSA International Annual Meeting, 10-13 Nov. 2019, San Antonio, Texas
2019
Soil Carbon Stocks and Soil Moisture Regimes of Historic Sedimentation in the Southern Piedmont. Wade, Anna, Daniel Richter, Alex Cherkinsky and Paul Heine (2019): Soil Science Society of America International Soils Meeting, San Diego, CA, 6-9 January 2019
2019
Tree Phosphorus Uptake from Argillic and Saprolite Horizons in a Weathered Ultisol in the Calhoun Critical Zone Observatory, USA. Wang, Z., A. Thompson, L. Sutter, and D. Markewitz (2019): ASA-CSSA-SSSA International Annual Meeting, 10-13 Nov. 2019, San Antonio, Texas
2018
Biogeochemical cycling of iron and carbon in humid (sub)tropical forest soils under fluctuating redox conditions. Barcellos, Diego (2018): PhD Dissertation, Department of Crop and Soil Sciences, University of Georgia Cross-CZO
2018
Faster redox fluctuations can lead to higher iron reduction rates in humid forest soils. Barcellos, Diego, K. Taylor Cyle, Aaron Thompson (2018): Biogeochemistry 137 (3): 367-378 Cross-CZO
2018
Loss of deep roots limits biogenic agents of soil development that are only partially restored by decades of forest regeneration. Billings, S.A., D. Hirmas, P.L. Sullivan, C.A. Lehmeier, S. Bagchi, K. Min, Z. Brecheisen, E. Hauser, R. Stair, R. Flournoy, D. deB. Richter (2018): Elementa Science of the Anthropocene 6(1): 34
2018
Carbon isotopes reveal signals of the Anthropocene in soil carbon pools deep within the critical zone. Billings, S.A., Z.S. Brecheisen, A. Cherkinsky, C.W. Cook, C. Lehmeier, D. deB. Richter (2018): American Geophysical Union 2018 Fall Meeting, Washington, DC, 10-14 Dec 2018
2018
A tale of two CZ’s: Comparing shallow and deep old-field forest regeneration at the Calhoun CZO. Brecheisen Z., Richter D., Cook C., and Heine P. (2018): Goldschmidt Conference, Boston, MA, 12-17 August 2018
2018
Time-series measurements of deep soil profile O2, CO2, soil moisture, and aboveground precipitation highlight differential rooting across landuse history treatments at the Calhoun Critical Zone Observatory. Brecheisen, Z.S., D. deB. Richter, C.W. Cook, P. Heine, J. Austin (2018): American Geophysical Union 2018 Fall Meeting, Washington, DC, 10-14 Dec 2018
2018
Macro to Micro Legacies of Landuse at the Calhoun Critical Zone Observatory. Brecheisen, Zachary S. (2018): PhD Dissertation, Duke University, Durham, North Carolina
2018
Evaluating the effect of nutrient redistribution by animals on the phosphorus cycle of lowland Amazonia. Buendía, Corina, Axel Kleidon, Stefano Manzoni, Björn Reu, and Amilcare Porporato (2018): Biogeosciences 15: 279-295
2018
Ecohydrological controls on iron redox fluctuations. Calabrese, Salvatore, and Amilcare M. Porporato (2018): American Geophysical Union 2018 Fall Meeting, Washington, DC, 10-14 Dec 2018
2018
A dynamical system approach to soil iron and carbon cycles. Calabrese, Salvatore, and Amilcare Porporato (2018): European Geosciences Union General Assembly, 4-13 April, 2018, Vienna, Austria
2018
Influence of pO2 on iron redox cycling and anaerobic organic carbon mineralization in a humid tropical forest soil. Chen, Chunmei, Christof Meile, Jared Wilmoth, Diego Barcellos, and Aaron Thompson (2018): Environmental Science & Technology 52 (14): 7709-7719 Cross-CZO
2018
Tree carbon investments and soil phosphorus dividends: How do rooting systems maximize P acquisition while being thrifty with their carbon?. Hauser, E., D. deB. Richter, S.A. Billings (2018): American Geophysical Union 2018 Fall Meeting, Washington, DC, 10-14 Dec 2018
2018
Potential for iron reduction increases with rainfall in montane basaltic soils of Hawaii. Hodges, C., E. King, J. Pett-Ridge, A. Thompson (2018): Soil Science Society of America Journal 82:176-185 Cross-CZO
2018
Decadal restructuring of soil carbon and nitrogen in a regenerating forest on long cultivated land in the southern piedmont of the USA. Richter, Daniel, Megan Mobley, Sharon Billings, Daniel Markewitz, Anna Wade (2018): North American Forest Soils Conference – International Symposium on Forest Soils, Quebec City, Quebec, Canada, June 10-16, 2018
2018
Short-range-ordered (SRO) iron minerals are dynamic, emergent representations of recent environmental conditions in soils . Thompson, Aaron (2018): American Geophysical Union 2018 Fall Meeting, Washington, DC, 10-14 Dec 2018 Cross-CZO
2017
Field measurements of soil iron and carbon cycling during spring warm-up in an aggrading pine forest at the Calhoun CZO. Barcellos, D, C Hodges, D Markewitz, E. Ardington, and A Thompson (2017): Soil Science Society of America International Annual Meeting, Tampa, FL, 22-25 Oct. 2017
2017
Hot spots and hot moments for redox, iron and carbon cycling in soils across Luquillo and Calhoun CZOs. Barcellos, D., and Thompson, A. (2017): Critical Zone Science: Current Advances and Future Opportunities, Arlington, VA, 4-6 June, 2017 Cross-CZO
2017
Drivers of redox, iron and carbon in soils from the Calhoun CZO. Barcellos, Diego, Dan Markewitz, Caitlin Hodges, Aaron Thompson (2017): Calhoun CZO 2017 Summer Science Meeting, Union, SC, 17-18 May 2017
2017
Deep and persistent consequences of long-term changes in land cover. Billings, S.A., Richter, D.D., Sullivan, P.L., Lehmeier, C.A., Bagchi, S., Min, K., Hauser, E., Stair, R., Flournoy, R. (2017): Calhoun CZO 2017 Summer Science Meeting, Union, SC
2017
Soil biogeochemistry reveals the importance of deep roots as biotic controls of CZ evolution: a belowground analog to Ruddiman’s hypothesis. Billings, S.A., Sullivan, P.L., Richter, D.D., Lehmeier, C.A., Min, K., Bagchi, S., Flournoy, R., Hauser, E. (2017): Critical Zone Science: Current Advances and Future Opportunities, Arlington, VA, 4-6 June, 2017
2017
Soil weathering agents are limited where deep tree roots are removed, even after decades of forest regeneration. Billings, Sharon A, Daniel deB. Richter, Daniel Hirmas, Christoph Lehmeier, Samik Bagchi, Zachary Brecheisen, Pamela L Sullivan, Kyungjin Min, Emma Hauser, Rena Stair, Rebecca Flournoy (2017): American Geophysical Union 2017 Fall Meeting, New Orleans, Louisiana, 11-15 December 2017
2017
Old-field succession: Land-use legacies and below-ground respiration. Brecheisen, Zachary, Daniel Richter, Will Cook, Paul Heine (2017): Ecological Society of America Annual Meeting, Portland, OR, 6-11 August 2017
2017
Regeneration of critical zone structure: Macroporosity and soil gasses in old-field forest soils of the southeastern US. Brecheisen, Zachary, Mac A. Callaham Jr., Daniel deB. Richter (2017): Soil Science Society of America International Annual Meeting, Tampa, FL, 22-25 Oct. 2017
2017
The impact of O2 concentrations and organic matter on Fe(II) oxidation and the resulting Fe(III) solids in the presence of Fe/Al oxide sorbents. Chen, C., and Thompson, A. (2017): Critical Zone Science: Current Advances and Future Opportunities, Arlington, VA, 4-6 June, 2017
2017
Carbon and oxygen isotope composition in soil carbon dioxide within deep Ultisols at the Calhoun CZO, South Carolina, USA. Cherkinsky, A., Brecheisen Z., Richter D. (2017): 2nd International Radiocarbon in the Environment Conference, Debrecen, Hungary, 3-7 July 2017
2017
AMS and IRMS studies of different soil organic matter fractions in Ultisol profiles, Calhoun CZO, South Carolina USA. Cherkinsky, A., G.V.R. Prasad, H. Pan, D. Richter (2017): 14th International Conference on Accelerator Mass Spectrometry, Ottawa, Canada
2017
Estimation of soil respiration rates and soil gas isotopic composition for the different land use of Ultisols from Calhoun CZO. Cherkinsky, Alexander, Zachary Brecheisen, Daniel deB. Richter, Hong Sheng (2017): American Geophysical Union 2017 Fall Meeting, New Orleans, Louisiana, 11-15 December 2017
2017
Soil organic matter stabilization by Fe-C interactions in temperate and tropical soils: A cross-CZO comparison. Coward, E.K., Thompson, A., and Plante, A.F. (2017): Critical Zone Science: Current Advances and Future Opportunities, Arlington, VA, 4-6 June, 2017 Cross-CZO
2017
Influence of Linked Hydrologic and Geomorphic Processes on the Terrestrial Carbon Cycle. Dialynas, Ioannis Minas (Yannis) (2017): Doctoral dissertation, School of Civil and Environmental Engineering, Georgia Institute of Technology Cross-CZO
2017
Hydrologic drivers of soil organic carbon erosion and burial: Insights from a spatially-explicit model of a degraded landscape at the Calhoun Critical Zone Observatory. Dialynas, Yannis G., Rafael L. Bras, Daniel deB. Richter (2017): American Geophysical Union 2017 Fall Meeting, New Orleans, Louisiana, 11-15 December 2017
2017
Soil Phosphorous redistribution in the Calhoun CZO. Foroughi, M., and D. Markewitz (2017): Warnell Graduate Student Symposium, University of Georgia, Athens, GA
2017
Soil Phosphorus distribution in contrasting land-use history. Foroughi, Maryam, and Daniel Markewitz (2017): Calhoun CZO 2017 Summer Science Meeting, Union, SC, 17-18 May 2017
2017
Soil phosphorus distributions in the Calhoun CZO landscape. Foroughi, Maryam, Lori Sutter, and Daniel Markewitz (2017): Soil Science Society of America 2017 Annual Meeting
2017
Illuminating pathways of forest nutrient provision: relative release from soil mineral and organic pools. Hauser, Emma, and Sharon A Billings (2017): American Geophysical Union 2017 Fall Meeting, New Orleans, Louisiana, 11-15 December 2017 Cross-CZO
2017
Water and carbon influence the distribution of iron reduction at the Calhoun CZO. Hodges, C., Mallard, J., Markewitz, D., and Thompson, A. (2017): University of Georgia Plant and Soil Symposium, Athens, GA
2017
Iron cycling under oscillatory redox conditions: from observations to processes (Invited). Meile, Christof D, Chunmei Chen, Diego Barcellos, Jared Wilmoth, Aaron Thompson (2017): American Geophysical Union 2017 Fall Meeting, New Orleans, Louisiana, 11-15 December 2017
2017
Temperature responses of microbial soil organic matter decomposition and associated respiration at various scales, ranging from exo-enzymes to populations and communities. Min, Kyungjin (2017): PhD Dissertation, University of Kansas
2017
Boom and bust carbon-nitrogen dynamics during reforestation. Parolari, A.J., M.L. Mobley, A.R. Bacon, G.G. Katul, D.deB. Richter, and A. Porporato (2017): Ecological Modelling 360: 108-119
2017
Impact of seasonal variability in water, plant and soil nutrient dynamics in agroecosystems. Pelak, N. F., III; Revelli, R.; Porporato, A. M. (2017): American Geophysical Union 2017 Fall Meeting, 11-15 Dec. 2017, New Orleans, LA
2017
Earthcasting controls of vegetation on solute fluxes and soil development in the critical zone. Sullivan, P.L., Goddéris, Y., Li, L., Billings, S., Macpherson, G.L., Shi, Y., Schott, J., Brantley, S.L. (2017): Critical Zone Science: Current Advances and Future Opportunities, Arlington, VA, 4-6 June, 2017 Cross-CZO
2017
Key features of redox fluctuating soils that influence iron cycling. Thompson, Aaron; Meile, Christof; Wilmoth, Jared; Barcellos, Diego; Chen, Chunmei; Ginn, Brian; Hodges, Caitlin (2017): American Chemical Society National Meeting, San Francisco, CA, 2-6 April 2017
2016
Integrating soil ecological knowledge into restoration: How relevant is theory to practice?. Baer, S.B., and M.A. Callaham (2016): Ecological Society of America Annual Meeting, Ft. Lauderdale, FL, USA, August 2016
2016
Aging exo-enzymes can create temporally shifting, temperature-dependent resource landscapes for microbes. Billings, S., K. Min, F. Ballantyne IV, Y. Chen, M. Sellers (2016): Biogeochemistry 131:163-172
2016
Soil C transformations and translocation at the Calzone. Billings, S.A. (2016): Calhoun CZO 2016 Summer Science Meeting, Clinton, SC
2016
Scaling from small-scale experiments to the Critical Zone to explain ecosystem patterns of soil organic C dynamics. Billings, S.A. (2016): Seminar at Kansas State University, May 2016
2016
Projecting soil feedbacks to atmospheric CO2 following erosion and deposition on centennial timescales in two contrasting forests: A study of critical zone-atmosphere exchange. Billings, S.A., D. Richter, S.E. Ziegler, K.L. Prestegaard (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA
2016
Soil organic matter stabilization by Fe-C interactions in temperate and tropical soils: A cross-CZO comparison. Coward, E.K., Thompson, A., Markewitz, D., Richter, D. deB., and Plante, A.F. (2016): Soil Science Society of America Annual Meeting, Phoenix, AZ, 6-9 November 2016 Cross-CZO
2016
Substrate quality influences organic matter accumulation in the soil silt and clay fraction. Cyle, K.T., N. Hill, K. Young, T. Jenkins, D. Hancock, P.A. Schroeder, A. Thompson (2016): Soil Biology and Biochemistry 103: 138-148
2016
Topographic variability and the influence of soil erosion on the carbon cycle. Dialynas, Y. G., S. Bastola., R. L. Bras, S. A. Billings, D. Markewitz, and D. deB. Richter (2016): Global Biogeochemical Cycles 30(5): 644-660
2016
Influence of erosion and deposition on soil organic carbon dynamics. Dialynas, Y.G., Bras, R.L., and Richter, D.deB. (2016): Calhoun CZO 2016 Summer Science Meeting
2016
Impact of hydrologically driven hillslope erosion and landslide occurrence on soil organic carbon dynamics in tropical watersheds. Dialynas,Y.G., Bastola, S., Bras, R.L., Marin-Spiotta, E., Silver, W.L., Arnone, E., and Noto, L.V. (2016): Water Resources Research 52(11): 8895-8919 Cross-CZO
2016
Topographic influences on phosphorus redistribution in the Calhoun CZO, South Carolina. Foroughi, M., and D. Markewitz (2016): Workshop: Phosphorus Cycling in Terrestrial Ecosystems: Advancing our fundamental understanding through a model-data connection, May 23-25, 2016, Townsend, TN
2016
Probing iron reduction from cm to km scales in forested ecosystems. Hodges, C., and A. Thompson (2016): Soil Science Society of America Annual Meeting, Minneapolis, MN
2016
Linking spatial and temporal patterns of soil moisture with iron reduction at the Calhoun CZO. Hodges, C., D. Markewitz, and A. Thompson (2016): Soil Science Society of Georgia Annual Meeting, Athens, GA
2016
Linking spatial and temporal patterns of soil moisture with iron reduction at the Calhoun CZO. Hodges, C., D. Markewitz, and A. Thompson (2016): University of Georgia Agronomy Graduate Student Association Annual Poster Session, Athens, GA
2016
Temporal variation of water and carbon influence the distribution of upland iron reduction in soils. Hodges, C., Mallard, J., Markewitz, D., Thompson, A., and McGlynn, B. (2016): Soil Science Society of America Annual Meeting, Phoenix, AZ, 6-9 November 2016
2016
Global nitrogen budgets in cereals: A 50-year assessment for maize, rice, and wheat production systems. Ladha, J.K., A. Tirol-Padre, C.K. Reddy, K.G. Cassman, S. Verma, D.S. Powlson, C. van Kessel, D. deB. Richter, D. Chakraborty, and H. Pathak (2016): Scientific Reports 6: 19355
2016
Temperature-mediated changes in microbial carbon use efficiency and 13C discrimination. Lehmeier, C.A., F. Ballantyne IV, K. Min, and S.A. Billings (2016): Biogeosciences 13: 3319-3329
2016
Hydrologic and biologic influences on stream network nutrient concentrations: Interactions of hydrologic turnover and concentration-dependent nutrient uptake. Mallard, J.M., B.L. McGlynn, and T.P. Covino (2016): European Geosciences Union General Assembly 2016, Vienna, Austria
2016
Biomass-C specific temperature responses of microbial C transformations reveal consistency regardless of microbial community structure across diverse timescales of inquiry. Min, K., K.M. Buckeridge, S.E. Ziegler, K.A. Edwards, S. Bagchi, S.A. Billings (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA
2016
Carbon availability modifies temperature responses of heterotrophic microbial respiration, carbon uptake affinity, and stable carbon isotope discrimination. Min, Kyungjin, Christoph A. Lehmeier, Ford Ballantyne IV, and Sharon A. Billings (2016): Frontiers in Microbiology 7, Article 2083
2016
Forest soil carbon and nitrogen cycles under biomass harvest: Stability, transient response, and feedback. Parolari, A.J., Porporato, A. (2016): Ecological Modelling 326: 64-76
2016
Bistable plant-soil dynamics and biogenic controls on the soil production function. Pelak, N.F., A.J. Parolari, and A. Porporato (2016): Earth Surface Processes and Landforms 41(8): 1011-1017
2016
Volume and carbon contents of legacy sediments in the Holcombe's Branch watershed - The "discovery" of a novel biogeochemical system. Richter, D. deB. (2016): Calhoun CZO 2016 Summer Science Meeting, Clinton, SC
2016
Rapid turnover and minimal accretion of mineral soil carbon during 60-years of pine forest growth on previously cultivated land. Richter, D., M.L. Mobley, S.A. Billings, and D. Markewitz (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA
2016
The role of redox variability in structuring iron cycling in soils. Thompson, A. (2016): Georgia Tech Environmental Science and Technology Sympoium Series, Atlanta, GA
2016
Can we predict iron reduction rates across terrestrial ecosystems?. Thompson, A. (2016): Telluride Summer Science Series, Telluride, CO
2016
Representation of diffusion controlled carbon stabilization in reactive transport models. Thompson, A., Druhan, J.L., Keiluweit, M., Wagai, R., Plante, A.F., Lawrence, C.R., Berhe, A.A., Sierra, C.A., Rasmussen, C., Marin-Spiotta, E., Blankinship, J.C., Schimel, J., Heckman, K.A., Crow, S.E., and Wieder, W.R. (2016): American Geophysical Union 2016 Fall Meeting, San Francisco, CA Cross-CZO
2015
Coupling of Carbon-Nitrogen cycle on a physically based distributed hydrological model, tRIBS. Bastola, S. (2015): Calhoun CZO 2015 Summer Science Meeting
2015
Scaling from small-scale experiments to the Critical Zone to explain ecosystem patterns of soil organic C dynamics. Billings, S., Lehmeier, C., Min, K., Flournoy, R., & Richter, D. (2015): Cross CZO Working Group on Organic Matter Dynamics with Sino-US partners, Purdue University
2015
Small-scale experiments in diverse ecosystem highlight intricate linkages between microbial behavior and ecosystem-scale processes. Billings, S., Wood, T., Buckeridge, K., Min, K., Lehmeier, C., Flournoy, R., Huang, Z., Ziegler, S., Richter, D., Pett-Ridge, J., Brodie, E., Bouskill, N. (2015): Ecological Society of America Annual Meeting, Baltimore, MD
2015
Investigating microbial transformations of soil organic matter: synthesizing knowledge from disparate fields to guide new experimentation. Billings, S.A., Tiemann, L.K., Ballantyne, F., Lehmeier C.A., Min, K. (2015): Soil 1: 313-330
2015
14C distribution in soils with different history of land use in Calhoun CZO. Cherkinsky, A., and Markewitz, D. (2015): Goldschmidt Conference, Prague, CZ
2015
Carbon turnover rates in soils with the different history of land use. Cherkinsky, A., and Markewitz, D. (2015): Calhoun CZO 2015 Summer Science Meeting
2015
A Coupled Spatially Explicit Modelling Approach to Assess the Influence of Soil Erosion and Deposition on the Redistribution of Soil Organic Carbon at the Watershed Scale. Dialynas, Y. G., Bastola, S., Bras, R. L., Billings, S. A., Richter, D. deB., and Markewitz, D. (2015): 2nd Annual Southeastern Biogeochemistry Symposium, Atlanta, GA, Mar. 28-29, 2015
2015
Topographic variability in the influence of soil erosion on the carbon cycle. Dialynas, Y. G., Bastola, S., Bras, R. L., Billings, S. A., Richter, D. deB., and Markewitz, D. (2015): Calhoun CZO 2015 Summer Science Meeting
2015
Proposal: Assessing soil phosphorus status over time and under different land uses. Foroughi, M. (2015): Calhoun CZO 2015 Summer Science Meeting
2015
Sample Modeling for Soil Phosphorus at the Calhoun CZO via GIS Applications. Foroughi, M., D. Markewitz, and C. A. Hodges (2015): Calhoun CZO 2015 Summer Science Meeting
2015
Using Electromagnetic Induction to Determine Spatial and Temporal Patterns of Iron Reduction at the Calhoun CZO. Hodges, C., Markewitz, D., and Thompson, A. (2015): Calhoun CZO 2015 Summer Science Meeting
2015
Is δ13C of respired CO2 dependent on growth rate? Exploring carbon isotope discrimination in soil microbes. Lehmeier, C. A., Min, K. J., Billings, S. A. (2015): Calhoun CZO 2015 Summer Science Meeting
2015
Effects of temperature on microbial transformation of organic matter - comparing stories told by purified enzyme assays, chemostat experiments and soils. Lehmeier, C.; Min, K.; Good, H.; Billings, S. (2015): American Geophysical Union Fall Meeting, December 2015, San Francisco, CA
2015
How deep and persistent are the influences of aboveground disturbance on soil microbial activities at the Calhoun CZO?. Min, K. J., Lehmeier, C. A., Billings, S. A. (2015): Calhoun CZO 2015 Summer Science Meeting
2015
Surficial gains and subsoil losses of soil carbon and nitrogen during secondary forest development. Mobley, Megan L., Kate Lajtha, Marc G. Kramer, Allan R. Bacon, Paul R. Heine and Daniel deB. Richter (2015): Global Change Biology 21(2): 986-996
2015
A Proposal for a Calhoun Drilling Program: Where geophysics meets (bio)geochemistry. Richter, D. (2015): Calhoun CZO 2015 Summer Science Meeting
2014
Guiding empirical and theoretical explorations of organic matter decay using disparate fields. Billings, S., Ballantyne, F., Lehmeier, C., Min, K. (2014): American Geophysical Union annual meeting, San Francisco, California, December, 2014
2014
Temperature and substrate C:N drive microbial carbon use efficiency and 13C discrimination. Billings, S., Lehmeier, C., Min, K., Ballantyne, F. (2014): Soil Science Society of America annual meeting, Long Beach, California, November, 2014
2014
Assessing the impact of landscape evolution on carbon dynamics: a coupled physically-based modelling approach. Dialynas, Y. G.; Bastola, S.; Billings, S. A.; Bras, R. L. (2014): American Geophysical Union annual meeting, San Francisco, California, December, 2014
2014
Soil N as a buffer of critical zone carbon and nitrogen cycles in harvested ecosystems. Parolari, A.J., G.G. Katul, and A. Porporato (2014): American Geophysical Union Fall Meeting, December 2014, San Francisco, CA
2014
Evolution of Soil, Ecosystem, and Critical Zone Research at the USDA FS Calhoun Experimental Forest. Richter, D. deB., A.R. Bacon, S.A. Billings, D. Binkley, M. Buford, M.A. Callaham, A.E. Curry, R.L. Fimmen, A. S. Grandy, P.R. Heine, M. Hofmockel, J.A. Jackson, E. LeMaster, J. Li, D. Markewitz, M.L. Mobley, M.W. Morrison, M.S. Strickland, T. Waldrop, and C. G. Wells (2014): In: USDA Forest Service Experimental Forests and Ranges: Research for the Long Term, Chapter: 18, Publisher: Springer Verlag, Editors: D.C. Hayes, S.L. Stout, R.H. Crawford, A.P. Hoover, pp. 405-433
2014
Ecosystem and geoscientists to hybridize their sciences. Richter, D., Billings, S. (2014): American Geophysical Union annual meeting, San Francisco, California, December, 2014
2013
Accumulation and decay of woody detritus in a humid subtropical secondary pine forest. Mobley, Megan L., Daniel deB. Richter, and Paul R. Heine (2013): Canadian Journal of Forest Research 43: 109–118
2013
Coupled dynamics of soil formation and erosion in natural and agricultural ecosystems. Pelak, N. F.; Manzoni, S.; Wang, J.; Bras, R. L.; Porporato, A. M. (2013): American Geophysical Union Fall Meeting, December 2013, San Francisco, CA
2012
Coupling meteoric 10Be with pedogenic losses of 9Be to improve soil residence time estimates on an ancient North American interfluve. Bacon, Allan R., Daniel deB. Richter, Paul R. Bierman, and Dylan H. Rood (2012): Geology 40 (9): 847–850
2011
An Ecosystem Approach to Dead Plant Carbon over 50 years of Old-Field Forest Development. Mobley, Megan Leigh (2011): PhD Dissertation, Duke University, Durham, North Carolina
2010
A simple method for estimating the influence of eroding soil profiles on atmospheric CO2. Billings, S. A., Buddemeier, R. W., Richter, D. deB., Van Oost, K., and Bohling, G. (2010): Global Biogeochemical Cycles, Vol. 24, GB2001
2010
Effects of land-use history on soil spatial heterogeneity of macro- and trace elements in the Southern Piedmont USA. Li, Jianwei, Daniel deB. Richter, Arlene Mendoza, Paul Heine (2010): Geoderma Volume 156(1-2): 60-73
2009
Effects of Land-Use History on Soil Macro- and Trace Elements in the Southern Piedmont of North America. Li, Jianwei (2009): PhD Dissertation, Duke University
2008
Rhizogenic Fe–C redox cycling: a hypothetical biogeochemical mechanism that drives crustal weathering in upland soils. Fimmen, Ryan L., Daniel deB. Richter, Jr., Dharni Vasudevan, Mark A. Williams, Larry T. West (2008): Biogeochemistry 87(2): 127-141
2008
Four-decade responses of soil trace elements to an aggrading old-field forest: B, Mn, Zn, Cu, and Fe. Li, Jianwei, Daniel deB. Richter, Arlene Mendoza, Paul Heine (2008): Ecology 89 (10): 2911-2923
2007
Humanity's transformation of Earth's soil: Pedology's new frontier. Richter, D. deB. (2007): Soil Science 172 (12): 957-967
2006
Changes in stable isotope signatures of soil nitrogen and carbon during 40 years of forest development. Billings, S. A. and Richter, D. D. (2006): Oecologia 148 (2): 325-333
2006
Bioavailability of slowly cycling soil phosphorus: major restructuring of soil P fractions over four decades in an aggrading forest. Richter, Daniel D., H. Lee Allen, Jianwei Li, Daniel Markewitz, Jane Raikes (2006): Oecologia 150 (2): 259-271
2005
Elemental translocation and loss from three highly weathered soil–bedrock profiles in the southeastern United States. Oh, N-H, and D. D. Richter (2005): Geoderma 126 (1-2): 5-25
2005
What regulates soil CO2 concentrations? A modeling approach to CO2 diffusion in deep soil profiles. Oh, N-H, H-S Kim, and D. D. Richter, Jr. (2005): Environmental Engineering Science 22 (1): 38-45
2004
Soil acidification induced by elevated atmospheric CO2. Oh, N-H, and D. deB. Richter, Jr. (2004): Global Change Biology 10 (11): 1936-1946
2000
Long-term soil potassium availability from a Kanhapludult to an aggrading loblolly pine ecosystem. Markewitz, Daniel, Daniel D.Richter (2000): Forest Ecology and Management 130 (1-3): 109-129
2000
Legacies of agriculture and forest regrowth in the nitrogen of old-field soils. Richter, Daniel D., Daniel Markewitz, Paul R. Heine, Virginia Jin, Jane Raikes, Kun Tian, Carol G. Wells (2000): Forest Ecology and Management 138 (1-3): 233-248
1999
Rapid accumulation and turnover of soil carbon in a re-establishing forest. Richter, Daniel D., Daniel Markewitz, Susan E. Trumbore, and Carol G. Wells (1999): Nature 400: 56-58
1998
Three decades of observed soil acidification at the Calhoun Experimental Forest: Has acid rain made a difference?. Markewitz, D., D.D. Richter, H.L. Allen, J.B. Urrego (1998): Soil Science Society of America Journal 62 (5): 1428-1439
1996
Soil acidification, soil potassium availability, and biogeochemistry of aluminum and silicon in a 34 year old loblolly pine (Pinus taeda L) ecosystem in the Calhoun Experimental Forest, South Carolina. Markewitz, Daniel (1996): PhD Dissertation, Duke University
1995
Soil carbon turnover in a recovering temperate forest. Harrison, K.G., W.M. Post, D.D. Richter (1995): Global Biogeochemical Cycles 9 (4): 449-454
1994
Soil chemical change during three decades in an old-field Loblolly Pine (Pinus taeda L) ecosystem. Richter, D.D., D. Markewitz, C.G. Wells, H.L. Allen, R. April, P.R. Heine, B. Urrego (1994): Ecology 75 (5): 1463-1473
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Calhoun News - Biogeochemistry
2019
Field trip of Penn State students to the Calhoun, 6/7/2019
21 Aug 2019 - Dan Markewitz and Dan Richter led a field trip on June 6-7, 2019 in the rain (perhaps 3") across the Calhoun CZO with Penn State students. We...
Mac Callaham’s group presents at the Society for Freshwater Science annual meeting
31 May 2019 - Mac Callaham and his group shared their research on earthworms at the May 2019 Society for Freshwater Science annual meeting in Salt Lake City.
2018
Discussion paper open till April 5th in Biogeosciences
06 Mar 2018 - A discussion is open for the manuscript, "Elevating the biogeosciences within environmental research networks".
2017
Diego Barcellos Featured in UGA Graduate School Magazine
08 Feb 2017 - The Winter 2017 issue of UGA Graduate features an in-depth article about cross-CZO grad student Diego Barcellos
2016
Four soil pits installed in new Research Area 8!
21 Nov 2016 - Four soil pits were installed in new Research Area 8 at the Calhoun CZO on 21-22 November 2016 for easy access for soil sampling down to 2 meters.
Eight new soil pits dug at the Calhoun!
17 Oct 2016 - Eight soil pits were installed at the Calhoun CZO on 17-18 October 2016 for easy access for soil sampling down to 2 meters. Photo: Will Cook.
First flux tower erected at the Calhoun CZO
17 Aug 2016 - On August 17, 2016 a crew from Georgia Tech led by graduate student Yao Tang and professor Jingfeng Wang, with a little help from the folks at Duke,...
Going deep! Gas wells installed at 8.5 m
14 Jul 2016 - Another Calhoun CZO record - gas reservoirs installed at 8.5m depth! Jay Austin, Zach Brecheisen, and Dan Richter only stopped at 8.5m because they...
Critical Zone Profile - Diego Barcellos
09 Jun 2016 - PhD Student, Soil Science, University of Georgia
Historic Legacy Sediments Examined at 2016 Summer Science Meeting
03 Jun 2016 - The Calhoun CZO held its third annual Summer Science Days meeting. In the photo, Calhoun researchers discuss a 18th-19th century pine root...
2015
Critical Zone Profile - KYUNGJIN (KJ) MIN (soil ecologist, PhD student)
15 Nov 2015 - PhD Student, Department of Ecology and Evolutionary Biology, University of Kansas
CCZO researcher Amilcare Porporato lectures on soil moisture dynamics and stoichiometry controls
27 Aug 2015 - Presented at the University of Saskatchewan's Global Institute of Water Security 10/29/2014
2014
Cross-CZO activities
23 Jul 2014 - 1) Aaron Thompson is leading CCZO researchers in cooperating with other CZOs (notably Luquillo) to facilitate cross-CZO research to investigate the...
New CCZO publications
23 Jul 2014 - 1) A new history of Calhoun book chapter is being published this summer. Written by Dan Richter and co-authored by 19 scientists and land...
Duke PhD Students win 2-year IGERT Fellowships
23 Jul 2014 - Three students working on the Calhoun CZO have been selected to join Duke’s WISeNet program on wireless technology. They will work...
Calhoun Geophysics Week with Wyoming Center for Environmental Hydrology and Geophysics
01 Apr 2014 - Wyoming Experts in Geophysics Visit the Calhoun CZO for Four Days of Measurements
Richter interviewed on YouTube by British Society of Soil Science
01 Apr 2014 - Prof. John Quinton of Lancaster University interviews Prof. Richter for the BSSS on the changing model of soil, the topic of the 2013 Russell Lecture
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