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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Sierra People - Biogeochemistry
11 People
Cross-CZO COLLABORATOR
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ecology, soil microbial ecology, biogeochemistry, invasion ecology
GRAD STUDENT
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UC Merced
Ecology
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UC Merced
Soils/Pedology, impacts of fire and erosion on soil, Biogeochemistry, terrestrial C sequestration
Cross-CZO INVESTIGATOR
.(JavaScript must be enabled to view this email address)
Hydrology and Biogeochemistry
GRAD STUDENT
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UC Merced
Ecology
COLLABORATOR
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LLNL
Hydrology, groundwater resource characterization
COLLABORATOR
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UC Merced
Biogeochemistry; Ecology, paleoecology, paleoclimatology
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Univ of Nevada Reno
Biogeochemical cycling, Soils
COLLABORATOR
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UC Riverside
Mycology, Soil Microbial Ecology, Host-Microbe Interactions, Ecological Restoration
GRAD STUDENT
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UC Merced
soil biogeochemistry, storage and stability of soil carbon, climate change
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UC Santa Barbara
Hydrology, Land Use, Climate
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Sierra Data - Biogeochemistry
National - Stream Water Chemistry - Cations, Anions, Metals (1982-2015)
1 components • Bisley, Betasso, East Peak, Marshall Gulch (High-Elevation), Providence Creek Subcatchment P301, Providence Creek Subcatchment P303, Providence Creek Subcatchment P304, Eel River Watershed, Puente Roto, Rio Blanco, Rio Icacos, Susquehanna Shale Hills Critical Zone Observatory • Biogeochemistry, Biology / Ecology, Hydrology, Water Chemistry • Hyojin, Kim; Bishop, Jim; Dietrich, William; Fung, Inez; McDowell, William H.; Brantley, Susan L.; Hoagland, Beth; Sullivan, Pamela L.; Cain, Molly; Neal, Andrew; Fisher, Jessica; Russo, Tess; Niwot Ridge LTER; Liu, Fengjing; Chorover, Jon; Troch, Peter; McIntosh, Jennifer; Brooks, Paul; Abramson, Nate; Heidbuechel, Ingo; Amistadi, Mary Key; Alexander Pedron, Shawn; Chorover, Jon; Troch, Peter; Corley, Timothy; Zapata-Rios, Xavier; Losleben, Mark; Condon, Katherine -
Sierra Models - Biogeochemistry
RHESSys
Regional Hydro-Ecologic Simulation System
A spatially distributed dynamic model of coupled eco-hydrologic processes.
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Sierra Publications - Biogeochemistry
2019
Aeolian dust deposition and the perturbation of phosphorus transformations during long-term ecosystem development in a cool, semi-arid environment. Gu, C.; Hart, S.C.; Turner, B.L.; Hu, Y.; Meng, Y.; Zhu, M. (2019): Geochemica et Cosmochimica Acta, 246, 498-514
2018
Quantifying the legacy of snowmelt timing on soil greenhouse gas emissions in a seasonally dry montane forest. BLANKINSHIP, J.C., E.P. MCCORKLE, M.W. MEADOWS, S.C. HART (2018): Global Change Biology
2018
Southern Sierra Critical Zone Observatory and Kings River Experimental Watersheds: A Synthesis of Measurements, New Insights, and Future Directions. O'Geen, A.; Safeeq, M.; Wagenbrenner, J.; Stacy, E.; Hartsough, P.; Devine, S.; Tian, Z.; Ferrell, R.; Hopmans, J.W.; and Bales, R. (2018): Vadose Zone Journal, 17:180081
2018
The role of soil physical properties for determining biogeochemical responses to soil warming. SANTOS, F., ABNEY, R., BARNES, M., JIN, L., MORELAND, K., BOGIE, N., SULMAN, B., GHEZZEHEI, T. A., BERHE, A.A. (2018): Chapter in Ecosystem Consequences of Soil Warming: Microbes, Vegetation, Fauna and Soil Biogeochemistry, 1st Ed. Jacqueline Mohan (Ed.) Academic Press
2018
Stabilization Mechanisms and Decomposition Potential of Eroded Soil Organic Matter Pools in Temperate Forests of the Sierra Nevada, California. Stacy, E.M.; Berhe, A.A.; Hunsaker, C.T.; Johnson, D.W.; Meding, S.M.; Hart, S.C. (2018): Journal of Geophysical Research: Biogeosciences, 124
2018
The deep Critical Zone as a source of mineral nutrients to montane, temperate forest ecosystems: PhD Dissertation. Uhlig, D. (2018): PhD Dissertation for Freien Universität Berlin
2018
Using research networks to create the comprehensive datasets needed to assess nutrient availability as a key determinant of terrestrial carbon cycling. Vicca, S.; Stocker, B.D.; Reed, S.; Wieder, W.R.; Bahn, M.; Fay, P.A.; Janssens, I.A.; Lambers, H.; Peñuelas, J.; Piao, S.; Rebel, K.T.; Sardans, J.; Sigurdsson, B.D.; Sundert, K.V.; Wang, Y.P.; Zaehle, S.; Ciais, P. (2018): Environmental Research Letters Cross-CZO National
2017
Generalized Model for the Temporal Evolution of the Carbon Sequestration Potential of Eroding Watersheds. Berhe, A.A.; Ghezzehei, T.A. (2017): Fall Meeting, American Geophysical Union, December 2017. Abstract B41E-2002
2017
Reviews and syntheses: on the roles trees play in building and plumbing the critical zone. Brantley, Susan L., David M. Eissenstat, Jill A. Marshall, Sarah E. Godsey, Zsuzsanna Balogh-Brunstad, Diana L. Karwan, Shirley A. Papuga, Joshua Roering, Todd E. Dawson, Jaivime Evaristo, Oliver Chadwick, Jeffrey J. McDonnell, Kathleen C. Weathers (2017): Biogeosciences, 14, 5115-5142 Cross-CZO National
2017
Responses of soil carbon turnover rates to pyrogenic carbon additions to a forest soil of Sierra Nevada, California: effects of pyrolysis temperature and soil depth. Santos, F.; Bird, J.A.; Berhe, A.A. (2017): Fall Meeting, American Geophysical Union, December 2017. Abstract B41F-2040.
2017
Distribution of ancient carbon in buried soils in an eroding loess landscape. Symanski, L.M.; Mason, J.A.; De Graaff, M.A.; Berhe, A.A.; Marin-Spiotta, E. (2017): Fall Meeting, American Geophysical Union, December 2017. Abstract B41E-2007
2017
Quantifying nutrient uptake as driver of rock weathering in forest ecosystems by magnesium stable isotopes. Uhlig, D., Schuessler, J.A., Bouchez, J., Dixon, J.L., von Blanckenburg, F. (2017): Biogeosciences 14, 3111-3128
2017
Snowmelt controls on concentration‐discharge relationships and the balance of oxidative and acid‐base weathering fluxes in an alpine catchment, East River, Colorado. Winnick M.J., Carroll R.W.H., Williams K.H., Maxwell, R.M., Dong, W., Maher K. (2017): Water Resources Research 53, 2507–2523 Cross-CZO National
2016
Effect of Tree-to-Shrub Type Conversion in Lower Montane Forests of the Sierra Nevada (USA) on Streamflow. Bart, R. R.,Tague, C. L., Moritz, M. A. (2016): PLOS ONE
2016
Meta-analysis reveals ammonia-oxidizing bacteria respond more strongly to nitrogen addition than ammonia-oxidizing archaea . Carey, C.J., Dove, N.C., Beman, J.M., Hart, S.C., Aronson E.L. (2016): Soil Biology and Biogeochemistry. 99. DOI: 10.1016/j.soilbio.2016.05.014.
2016
A montane Mediterranean climate supports year- round photosynthesis and high forest biomass . Kelly, A.E., and Goulden, M.L. (2016): Tree Physiology. 36 (4), DOI: 10.1093/treephys/tpv131
2016
Variation of organic matter quantity and quality in streams at Critical Zone Observatory watersheds. Miller, Matthew P., Boyer, Elizabeth W., McKnight, Diane M., Brown, Michael G., Gabor, Rachel S., Hunsaker, Carolyn T., Iavorivska, Lidiia, Inamdar, Shreeram, Johnson, Dale W., Kaplan, Louis A., Lin, Henry, McDowell, William H., Perdrial, Julia N. (2016): Water Resources Research, 52 (10): 8202–8216 Cross-CZO
2016
Effects of Model Spatial Resolution on Ecohydrologic Predictions and Their Sensitivity to Inter-Annual Climate Variability. Son, K., Tague, C., Hunsaker C. (2016): Hillslope and Watershed Hydrology
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
Erosional distribution of metal oxides and its implication for soil carbon dynamics. Berhe, A., Newman, A., Hunsaker, C. (2015): B11G. Organic Matter as an Integrated Signal of Climate and Land Use Change from Source to Sea I Posters, presented at 2015 Fall Meeting, AGU, San Francisco, CA, 14-18 Dec.
2015
Ecosystem carbon balance in a drier future: land-atmosphere exchanges of CO2, water and energy across semiarid southwestern North America. Biederman, J., Scott, R., Goulden, M., Litvak, M., Kolb, T., Yépez, E., Oechel, W., Meyers, T., Papuga, S., Ponce-Campos,G., Krofcheck, D., Maurer, G., Dore, S., Garatuza, J., Bell, T., Krishnan, P. (2015): B13F. Terrestrial Biome Fluxes and Biogeochemical Impacts of Forest Disturbances: Measurements and Modeling from Minutes to Millennia III Posters, presented at 2015 Fall Meeting, AGU, San Francisco, CA, 14-18 Dec.
2015
Resilience Through Disturbance: Effects of Wildfire on Vegetation and Water Balance in the Sierra Nevadas . Boisrame, G.F.S, Thompson, S.E., Stephens, S., Collins, B., Tague, N. (2015): American Geophysical Union Fall Meeting. San Francisco, CA
2015
Tools and perspectives for a unified approach to understanding microbial ecology in the critical zone. Gallery R., Aronson E., Fairbanks D., Murphy M., Rich V., Hart S. (2015): Abstract EP31A-0985 presented at 2015 Fall Meeting, AGU, San Francisco, CA, 14-18 Dec. Cross-CZO
2015
Laser vision: lidar as a transformative tool to advance critical zone science. Harpold, A. A., Marshall, J. A., Lyon, S. W., Barnhart, T. B., Fisher, B. A., Donovan, M., Brubaker, K. M., Crosby, C. J., Glenn, N. F., Glennie, C. L., Kirchner, P. B., Lam, N., Mankoff, K. D., McCreight, J. L., Molotch, N. P., Musselman, K. N., Pelletier, J., Russo, T., Sangireddy, H., Sjöberg, Y., Swetnam, T., and West, N. (2015): Hydrol. Earth Syst. Sci., 19, 2881-2897 Cross-CZO National
2015
The Median Isn’t the Message: Elucidating Nutrient Hot spots and Hot Moments in a Sierra Nevada Forest Soil. Hart, S., *Barnes, M., Johnson, D., Meadows, M. (2015): B22D Microbial Controls of Biogeochemical Cycling II, presented at 2015 Fall Meeting, AGU, San Francisco, CA, 14-18 Dec.
2015
If Rocks Could Talk: Origin Stories of Stream Sediment Told by Apatite Helium Ages and Cosmogenic Nuclides. Lukens, C., Riebe, C., Sklar, L., Shuster, D. (2015): EP41C. Mechanistic Underpinnings of Damage, Distruption, and Transport of Rock and Regolith Posters, presented at 2015 Fall Meeting, AGU, San Francisco, CA, 14-18 Dec.
2015
Soil carbon and nitrogen erosion in forested catchments: implications for erosion-induced terrestrial carbon sequestration. Stacy, E., Hart, S.C., Hunsaker, C.T., Johnson, D.W., Berhe, A.A. (2015): Biogeosciences, 12, 4861-4874
2015
Variability of Residence Time tracer Concentrations at the Southern Sierra Critical Zone Observatory during the California Drought. Visser, A., Thaw, M., Stacy, E., Hunsaker, C., Bibby, R., Deinhart, A.L., Schorzman, K., Egnatuk, C., Conklin, M., Esser, B. (2015): H21F Hydrochronology: Advances in Tracer Methods, Modeling Techniques, and Applications of Residence Times in Hydrology Research I Posters., presented at 2015 Fall Meeting, AGU, San Francisco, CA, 14-18 Dec.
2014
Bedrock composition regulates mountain ecosystems and landscape evolution. Hahm, W.J., Riebe, C.S., Lukens, C.E., and Araki, S. (2014): Proceedings of the National Academy of Sciences 111(9):3338-3343
2014 (In Press)
A Three-dimensional View of Nutrient Hotspots in a Sierra Nevada Forest Soil. Johnson, D.W., C. Woodward, M.W. Meadows. (2014): Soil Science Society of America Journal
2014
Groundwater and surface water flow to the Merced River, Yosemite Valley, California: 36C and Cl− evidence. Shaw, G.D., M.H. Conklin, G.J. Nimz, and F. Liu. (2014): Water Resources Research 50(3): 1943-1959
2013
Polymictic pool behavior in a montane meadow, Sierra Nevada, CA. Lucas, R. G. (2013): UC Merced M.Sc. Thesis
2013
Climate warming and eco-hydrology of forested watersheds in the California Sierra. Tague, C., K. Son, T. Brandt, and A.L. Dugger. (2013): American Geophysical Union, Fall Meeting 2013, abstract #EP11A-07
2013
Nutrient Hot Spots in a Sierra Nevada Forest Soil: Temporal Characteristics and Relations to Microbial Communities. Woodward, C., Johnson, D.W., Meadows, M.W., Miller, W.W., Hynes, M.M., and Robertson, C.M. (2013): Soil Science
2012
Erosion of bulk and pyrogenic C from upland forested Sierra Nevada ecosystems (Invited). Berhe, A.A., Stacy, E.M., McClintock, M., Newman, A., Hart, S.C., Hunsaker, C.T., Johnson, D.W. (2012): Fall meeting, American Geophysical Union, December 2012. Abstract B34C-08.
2012
Consequences of manipulated snow on soil gaseous emission and N retention in the growing season: a meta-analysis. Blankinship, J.C., Hart, S.C. (2012): Ecosphere 3(1).
2012
Geophysics in the Critical Zone: constraints on deep weathering and water storage potential in the Southern Sierra CZO. Holbrook, W., Riebe, C.S., Hayes, J.L., Reeder, K., Harry, D.L., Malazian, A.I., Dosseto, A., Hartsough, P.C., and Hopmans, J.W. (2012): Fall Meeting, American Geophysical Union, December 2012. Abstract EP41I-03.
2012
Three dimensional view of nutrient hotspots in a Sierra Nevada forest soil. Johnson, D.W., Meadows, M.W., Woodward, C. (2012): Fall Meeting, American Geophysical Union, December 2012. Abstract B43F-0468.
2012
Composition and stabilization mechanisms of organic matter in soils and sediments eroded from granitic, low-order catchments in the Sierra Nevada, California. Stacy, E.M. (2012): UC Merced MS Thesis
2012
Lateral redistribution of dissolved vs complexed organic matter with soil. Stacy, E.M., Medding, S.M., Hart, S.C., Hunsaker, C.T., Johnson, D.W., Berhe, A.A. (2012): Fall meeting, American Geophysical Union, December 2012. Abstract B34C-07.
2012
Elevation-dependent influence of snow accumulation on forest greening. Trujillo, E., Molotch, N.P., Goulden, M.L., Kelly, A.E., Bales, R.C. (2012): Nature Geoscience 5, 705-709
2012
Nutrient Hot Spots in a Sierra Nevada Soil: Physical Assessments and Contributing Factors. Woodward, C. (2012): University of Nevada, Reno.
2011
Nitrogen Contents and Fluxes in Sierra Nevada Forests of California . Hunsaker, C.T., Johnson, D. (2011): Fall meeting, American Geophysical Union, December 2011. Abstract B13G-0656
2011
Nutrient Hotspots in a Sierra Nevada Soil: Spatial Patterns on a Plot and a Watershed Scale. Johnson, D., Hunsaker, C.T., Meadows, M.W. (2011): Fall meeting, American Geophysical Union, December 2011. Abstract B33G-0551.
2011
The Nature and Potential Causes of Nutrient Hot Spots in a Sierra Nevada Forest Soil. Johnson, D.W., Miller, W.W., Rau, B.M., Meadows, M.W. (2011): Soil Science 176 (11): 596-610.
2011
Water and carbon cycling along the Sierra Nevada climate gradient. Kelly, A.E., Goulden, M., Meadows, M.W., Bales, R.C., Winston, G. (2011): Fall meeting, American Geophysical Union, December 2011, Halls A-C, 8:00 AM. Abstract B41A-0203.
2011
Physical and biogeochemical controls on polymictic behavior in Sierra Nevada stream pools. Lucas, R.G., Conklin, M.H., Tyler, S.W., Suarez, F.I., Moran, J.E., Esser, B.K. (2011): Fall meeting, American Geophysical Union, December 2011, Halls A-C, 8:00 AM. Abstract H51B-1209.
2011
Mechanisms of soil organic matter stabilization in sediments eroded from small Sierra Nevada catchments . Stacy, E., Hart, S.C., Hunsaker, C.T., Johnson,D., Berhe, A. (2011): Fall meeting, American Geophysical Union, December 2011. Abstract B31G-0382.
2011
Determination of Spatial and Temporal Variability of Hot Spots/Moments in the Soil on a Small Scale. Woodward, C., Johnson, D. (2011): Fall meeting, American Geophysical Union, December 2011. Abstract B33G-0553.
2011
Determination of Nutrient Laden Interflow Contributing to Hot Spots/Moments in the Soil on a Small Scale. Woodward, C., Johnson, D. W. (2011): Fall meeting, American Geophysical Union, December 2010. Abstract EP42A-06.
2010
Hot Spots and Hot Moments: Another Look at Nutrient Variability in Sierra Nevada Forest Soils. Johnson, D. W., Glass, D. W., Murphy, J. D., Stein, C. M., Miller, W. W. (2010): International Annual Meetings
2010
Nutrient hot spots in some Sierra Nevada forest soils. Johnson, D.W., Glass, D.W., Murphy, J.D., Stein, C.M., Miller, W.W. (2010): Biogeochemistry 101: 93-103.
2010
Carbon and Nutrient Contents in Soils from the Kings River Experimental Watershed, Sierra Nevada Mountains, California. Johnson, D.W., Hunsaker, C.F., Glass, D.W., Rau, B.M., Roath, B.A. (2010): Geoderma 160 (3-4): 490-502.
2010
Spatial Nutrient Variability in a Sierran Forest Soil: an Investigation into the Nature and Potential Causes of Nutrient Hot Spots . Johnson, D.W., Miller, W.W., Rau, B.M., Meadows, M.W. (2010): Fall Meeting, American Geophysical Union, December 2010. Abstract EP42A-05.
2009
Nutrient hotspots and O horizon runoff in a Sierra Nevada Watershed . Johnson, D. W., Miller, W. W., Meadows, M., Rau, B. R. (2009): Fall meeting, American Geophysical Union, December 2009. 90(52). Abstract EP52B-04.
2009
Short- and Long-term Perspectives of Soil Change: Interactions between Capacity and Intensity (Invited) . Johnson, D.W., Richter, D.D. (2009): Fall meeting, American Geophysical Union, December 2009. 90(52). Abstract B34B-01.
2009
Biogeochemical Cycling in Forest Soils of the Eastern Sierra Nevada Mountains. Johnson, D.W., W.W. Miller, R.B. Susfalk, R.A. Dahlgren, and D.W. Glass (2009): Forest Ecology and Management 258(10): 2249-2260
2009
Climate controls on anomalously high productivity in the mixed conifer forests of the Sierra Nevada. Kelly, A.E., Goulden, M.L. (2009): Fall meeting, American Geophysical Union, December 2009. 90(52). Abstract B33A-0359.
2008
Sampling Strategies in forest hydrology and biogeochemistry. Bales, R.C., Conklin, M.H., Krekez, B., Glaser, S.D., Hopmans, J. W., Hunsaker, C.T., Meadows, M.W. (2008): Forest Hydrology and Biogeochemistry. Ecological Studies, Volume 216, Part 2, 29-44.
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Sierra News - Biogeochemistry
2018
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Researcher Spotlight: Morgan Barnes
14 Nov 2018 - Say 'Hello!' to biogeochemist Morgan Barnes! Morgan specializes in the study of soil nutrient biogeochemistry, focusing on phosphorus in the Sierras
Multiple postdoc and grad student opportunities at UC Merced
12 Sep 2018 - Two postdoctoral scholar positions and multiple MS or PhD research assistantships are currently available at the University of California, Merced....
Dr. Stephen Hart Honored as 2018 Fellow of Ecological Society of America
03 Apr 2018 - The Ecological Society of America named SSCZO investigator Dr. Stephen Hart an ESA Fellow, a lifetime career award.
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".
Researcher Spotlight: Kimber Moreland
18 Jan 2018 - Meet the people behind the research!
2017
Tenure-track Assistant Professor Position: Biogeochemistry at University of Wyoming
13 Oct 2017 - The University of Wyoming invites applications for a tenure-track, Assistant Professor position in Biogeochemistry.
NSF: Dust contributes valuable nutrients to Sierra Nevada forest ecosystems
28 Mar 2017 - NSF Press Release: New research finding provides insight into role dust may play as ecosystems change
2016
Vegetation Matters: Type conversion could impact Sierra stream flow more than changing climate alone
02 Sep 2016 - This is an excerpt of a press release originally published on 30 August 2016 by James Badham, covering a new peer-reviewed article published by...
2015
Critical Zone Profile - LINDSAY ARVIN (geomorphologist, PhD student)
07 Sep 2015 - PhD Student, Department of Geology and Geophysics, University of Wyoming
Critical Zone Profile - MELISSA THAW (mountain hydrologist, PhD student)
07 Sep 2015 - PhD Student, Environmental Systems, University of California Merced
2014
NSF Early Career Award Honors Professor’s Research and Potential
12 May 2014 - "The National Science Foundation is honoring UC Merced Professor Asmeret Asefaw Berhe with a Faculty Early Career Development Award to support her...
UW Study: Bedrock Influences Forests More Than Previously Believed
10 Feb 2014 - Bedrock influences forests and landscape evolution much more than was previously thought, according to a study by University of Wyoming scientists.
2013
AGU Chapman Conference on Soil-mediated Drivers of Coupled Biogeochemical and Hydrological Processes
04 Apr 2013 - Biosphere II, Tucson AZ. 21-24 Oct. 2013.
Watershed-scale Experimental Design (KREW webinar)
19 Mar 2013 - Research Ecologist Carolyn Hunsaker presented a USFS Landscape Science webinar on the Kings River Experimental Watershed on March 19th. This hourly...
Post-Doctoral Position in Mountain Hydrology and Water Chemistry
19 Feb 2013 - The University of California at Santa Barbara and the U.S.D.A. Forest Service are recruiting for a post- doctoral research position in hydrology...
2012
Snowy, Sandy Research Explores Climate Change
06 Sep 2012 - From the white, sugary sands of Hawaii to the white, powdery slopes of the Sierra Nevada, Natural Sciences Professor Stephen Hart has his eye on...
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Sierra Events - Biogeochemistry
Goldschmidt 2018
Boston, Massachusetts.6th International Symposium on Soil Organic Matter
6th International Symposium on Soil Organic Matter: Healthy soils for sustainable agriculture: the role of SOM
Rothamsted Research, Harpenden (UK).UCM Seminar: Toby O'Geen
"The Role of Constructed Wetlands in Agriculture" with Toby O'Geen, ES Seminar October 8
COB 129, UC Merced Campus.Watershed Science Master Class
A short course for graduate students and post-doctoral fellows Sponsored by CUAHSI and the University of Arizona
Biosphere 2 near Tucson, Arizona.NatureBridge Afternoon Seminar Series
Tracking soil erosion & its impacts in Sierra Nevada forests
Girls' Club, Yosemite Valley.Goldschmidt 2012
Goldschmidt Conference, Montréal, June 2012: Earth in Evolution
Palais des Congrès, Montréal, Canada.
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