GC32C:
Semi-arid Shrublands under Changing Climates I

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Session ID#: 15664

Session Description:
Covering 35% of terrestrial land, arid and semi-arid systems are ripe for increased mechanistic understanding of the effects of increasing pressure from global change on ecosystem and community dynamics. While often overlooked, recent findings have underscored the importance of these ecosystems to global biogeochemistry, specifically their large role in driving interannual variability in the global carbon cycle. Changing climates may affect semi-arid shrublands in novel ways when compared to other systems, as a result of their already variable climatic conditions. This session invites contributions that explore the impact of altered precipitation, increased nutrient deposition, atmospheric carbon dioxide enrichment, warming temperatures, and increased invasion by exotic species on ecological processes in semi-arid shrublands, worldwide. We hope to collectively deepen understanding and improve predictions of how these systems are likely to change, and the impact this may have on both local and global scales.
Primary Convener:  Ellen H Esch, University of California San Diego, La Jolla, CA, United States
Conveners:  John B Kim, US Forest Service Corvallis, Corvallis, OR, United States, Dr. Joel A Biederman, PhD, Agricultural Research Service Tucson, Tucson, AZ, United States and David E Reed, Michigan State University, Center for Global Change and Earth Observations, East Lansing, MI, United States
Chairs:  Ellen H Esch, University of California San Diego, La Jolla, CA, United States, Dr. Joel A Biederman, PhD, Agricultural Research Service Tucson, Tucson, AZ, United States, David E Reed, Michigan State University, Center for Global Change and Earth Observations, East Lansing, MI, United States and John B Kim, US Forest Service Corvallis, Corvallis, OR, United States
OSPA Liaison:  John B Kim, US Forest Service Corvallis, Corvallis, OR, United States
Index Terms:

1615 Biogeochemical cycles, processes, and modeling [GLOBAL CHANGE]
1616 Climate variability [GLOBAL CHANGE]
1626 Global climate models [GLOBAL CHANGE]
1630 Impacts of global change [GLOBAL CHANGE]

Abstracts Submitted to this Session:

Detecting changes in water limitation in the West using integrated ecosystem modeling approaches (Invited) (122370)
Benjamin Poulter1, Jerad Hoy2, Kristen Emmett2, Molly Cross3, Marco P Maneta4 and Robert Al-Chokhachy5, (1)Spark Climate Solutions, Washington, D.C., United States, (2)Montana State University, Bozeman, MT, United States, (3)Wildlife Conservation Society, Bronx, NY, United States, (4)Associate Professor, University of Montana, Geosciences, Missoula, MT, United States, (5)USGS Geological Survey, Menlo Park, CA, United States
Fun in the Sun: Effects of Solar Radiation on Carbon Cycling in Semiarid Ecosystems of South America (Invited) (150499)
Amy Austin1,2, Paula Berenstecher2, M. Soledad Méndez2 and Carlos L. Ballare1, (1)IIB-CONICET, Universidad de San Martín, Buenos Aires, Argentina, (2)University of Buenos Aires, IFEVA-CONICET, Buenos Aires, Argentina
Changes of the Shrub/Grass balance under Climate Change: Mechanisms and Consequences (Invited) (142756)
Osvaldo Sala1, Laureano Gherardi1 and Jose Anadon2, (1)Arizona State University, School of Life Sciences, Tempe, AZ, United States, (2)CUNY Queens College, Flushing, NY, United States
Widespread tree mortality with the ongoing California drought: the roll of water balance and temperature (Invited) (194647)
Michael Goulden, University of California Irvine, Department of Earth System Science, Irvine, CA, United States and Roger C Bales, University of California Merced, Merced, CA, United States
Climate Sensitivity Functions and Ecosystem Dynamics Across a Grassland to Shrubland Transition Zone (175980)
Scott L Collins1, Jennifer Rudgers2, Esteban Muldavin3 and Douglas I Moore3, (1)University of New Mexico, Department of Biology, Albuquerque, NM, United States, (2)Department of Biology, MSC03-2020, University of New Mexico, Albuquerque, United States, (3)University of New Mexico Main Campus, Albuquerque, NM, United States
Integrating Measurements and Models of Water Limitation on Soil and Ecosystem Respiration in Two New England Forests from Hourly to Decadal Timescales. (131424)
Debjani Sihi1, Min Chen2, Eric A Davidson1, Kathleen E Savage3, Andrew D Richardson4, Prof. Trevor F Keenan5 and David Y Hollinger6, (1)University of Maryland Center for Environmental Science Appalachian Laboratory, Frostburg, MD, United States, (2)Carnegie Institution for Science Stanford, Department of Global Ecology, Stanford, CA, United States, (3)Woodwell Climate Research Center, Falmouth, United States, (4)School of Informatics, Computing and Cyber Systems, Northern Arizona University, Flagstaff, AZ, USA; Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, USA, Cambridge, United States, (5)Lawrence Berkeley National Laboratory, Berkeley, United States, (6)USDA Forest Service, Durham, NH, United States

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