B038
Does rising CO2 increase the terrestrial carbon sink?

Session ID#: 82152

Session Description:
Rising CO2 directly influences plant growth through enhanced photosynthesis and water-use efficiency. These proximal physiological effects are well understood at small scales (e.g. at the leaf-level); but as these effects scale through multiple ecological processes to alter carbon, water, and nutrient cycling and ecosystem structure, it becomes unclear whether elevated CO2 ultimately leads to an increased land carbon sink. Evidence both for and against a larger carbon sink under rising CO2 has been provided by manipulative experiments, flux observations, tree-ring studies, forest inventory analyses, remote sensing, and large-scale constraints. In this session, we welcome contributions from experimental, observational, and modeling communities to present and synthesize current evidence on how terrestrial ecosystems will respond to elevated CO2. We especially encourage presentations of research that attempts to resolve apparent conflicts in evidence.
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0428 Carbon cycling [BIOGEOSCIENCES]
1630 Impacts of global change [GLOBAL CHANGE]

Primary Convener:  Yao Liu, Oak Ridge National Laboratory, Oak Ridge, TN, United States
Conveners:  Anthony P Walker, Oak Ridge National Laboratory, Oak Ridge, TN, United States and David JP Moore, University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, United States
Primary Liaison:  Yao Liu, Oak Ridge National Laboratory, Oak Ridge, TN, United States
 
Large-scale observational and modelling-based constraints of the CO2 fertilization effect (Invited) (487598)
Ana Bastos, Ludwig Maximilians University of Munich, Dept. of Geography, Munich, Germany, Michael O'Sullivan, University of Leeds, Leeds, LS2, United Kingdom, Frédéric Chevallier, LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France, Christian Rödenbeck, Max Planck Institute for Biogeochemistry, Jena, Germany, Shilong Piao, Peking University, College of Urban and Environmental Sciences, Beijing, China, Stephen Sitch, University of Exeter, College of Life and Environmental Sciences, Exeter, United Kingdom, Julia Pongratz, Max Planck Institute for Meteorology, Hamburg, Germany, Benjamin Poulter, NASA GSFC, Biospheric Science, Greenbelt, MD, United States, Ashley Ballantyne, University of Montana, Missoula, MT, United States and Philippe Ciais, LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette, France
 
Fundamentals of Ecosystem Responses to Elevated CO2 (Invited) (488967)
Christian Körner, University of Basel, Basel, Switzerland
 
A Global Assessment of Tree Demographic Rates and the Implications of Size- and Age-Dependent Mortality for Carbon Storage (491134)
Jessica Fay Needham1, Daniel J Johnson2, Rosie Fisher3, Ryan G Knox1, Sean McMahon4, Charles Koven1 and NGEE-Tropics Team, (1)Lawrence Berkeley National Laboratory, Berkeley, CA, United States, (2)University of Florida, School of Forest Resources and Conservation, Gainesville, FL, United States, (3)National Center for Atmospheric Research, Boulder, CO, United States, (4)Smithsonian Environmental Research Center (SERC), Edgewater, MD, United States
 
Causes of Decelerating Seasonal CO2 Amplitude at Mauna Loa (505934)
Kai Wang1, Yilong Wang2, Xuhui Wang3, Shilong Piao3, Yue He3, Xiangyi Li4, Philippe Ciais2, Martin Heimann5, Shushi Peng3, Frédéric Chevallier2, Pierre Friedlingstein6, Stephen Sitch7, Wolfgang Buermann8, Vivek Arora9, Vanessa Elizabeth Haverd10, Atul K Jain11, Etsushi Kato12, Sebastian Lienert13, Danica Lombardozzi14, Julia Nabel15, Benjamin Poulter16, Nicolas Vuichard2, Andy Wiltshire17, Ning Zeng18, Dan Zhu19 and Corinne Le Quere20, (1)Peking University, Beijing, China, (2)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France, (3)Peking University, College of Urban and Environmental Sciences, Beijing, China, (4)Nanjing University, Nanjing, China, (5)MPI for Biogeochemistry, Jena, Germany, (6)University of Exeter, Exeter, United Kingdom, (7)University of Exeter, College of Life and Environmental Sciences, Exeter, United Kingdom, (8)University of Augsburg, Augsburg, Germany, (9)Canadian Centre for Climate Modelling and Analysis, Environment and Climate Change Canada, University of Victoria, Victoria, Canada, (10)CSIRO Canberra, Oceans and Atmosphere, Canberra, ACT, Australia, (11)University of Illinois at Urbana Champaign, Urbana, IL, United States, (12)National Institute for Environmental Studies, Tsukuba, Japan, (13)University of Bern, Climate and Environmental Physics, Bern, Switzerland, (14)National Center for Atmospheric Research, Boulder, CO, United States, (15)Max Planck Institute for Meteorology, Hamburg, Germany, (16)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (17)Met Office Hadley Centre, Exeter, United Kingdom, (18)University of Maryland, College Park, MD, United States, (19)CEA Saclay DSM / LSCE, Gif sur Yvette, France, (20)University of East Anglia, Norwich, NR4, United Kingdom
 
How does phosphorus availability affect vegetation response to elevated CO2? A synthesis of existing evidence (513247)
Mingkai Jiang1, Belinda Medlyn1, Silvia Caldararu2, Kristine Crous1, David Ellsworth1, Catriona MacDonald1, Benjamin Smith1 and Sönke Zaehle2, (1)Hawkesbury Institute for the Environment, Western Sydney University, Richmond, NSW, Australia, (2)Max Planck Institute for Biogeochemistry, Jena, Germany
 
Multiple constraints on biospheric CO2 fertilization (571286)
Qianyu Li1, Xingjie Lu2, Yao Zhang3, Junliang Zou4, Lifen Jiang5 and Yiqi Luo5, (1)Tsinghua University, Beijing, China, (2)School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China, (3)Department of Earth and Environmental Engineering, Columbia University, New York, United States, (4)Department of Earth System Science, Tsinghua University, Beijing, China, (5)Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, United States
 
Elevated CO2 in a Warming World: Effects on Coastal Wetland Carbon Sequestration (585663)
Genevieve L Noyce1, Patrick Megonigal1 and Matthew L. Kirwan2, (1)Smithsonian Environmental Research Center, Edgewater, MD, United States, (2)Virginia Institute of Marine Science, Gloucester Point, VA, United States
 
Elevated CO2 enhances coastal marsh carbon accumulation and resilience to sea level rise (599874)
Anthony J. Rietl1, Ellen R. Herbert2, Patrick Megonigal3 and Matthew L. Kirwan1, (1)Virginia Institute of Marine Science, Gloucester Point, VA, United States, (2)Ducks Unlimited, Memphis, United States, (3)Smithsonian Env Research Ctr, Edgewater, MD, United States
 
Elevated CO2, Mycorrhiza, and the Boreal Forest Carbon Balance (603769)
Oskar Franklin1, Torgny Näsholm2 and Nils Henriksson2, (1)IIASA International Institute for Applied Systems Analysis, Ecosystem Services and Management Program, Laxenburg, Austria, (2)Swedish University of Agricultural Sciences, Department of Forest Ecology and Management, Umeå, Sweden
 
Decadal biomass increment is stimulated by CO2-enrichment in early-succession woody ecosystems (604634)
Anthony P Walker, Oak Ridge National Laboratory, Oak Ridge, TN, United States, Martin Gerard De Kauwe, Macquarie University, Sydney, Australia, Belinda Medlyn, Western Sydney University, Hawkesbury Institute for the Environment, Sydney, Australia, Sönke Zaehle, Max Planck Institute for Biogeochemistry, Jena, Germany, Richard J Norby, Oak Ridge National Lab, Oak Ridge, TN, United States and FACE-MDS project
 
The influence of climate change and environmental factors on leaf gas exchange responses to elevated CO2 in five perennial grassland species (627556)
Melissa Pastore, University of Minnesota, Department of Ecology, Evolution, and Behavior, St. Paul, MN, United States, Tali Lee, University of Wisconsin Eau Claire, Dept. of Biology, Eau Claire, United States, Sarah E Hobbie, University of Minnesota Twin Cities, Dept. of Ecology, Evolution and Behavior, Saint Paul, MN, United States and Peter B. Reich, University of Minnesota Twin Cities, Department of Forest Resources, St. Paul, MN, United States
 
Moving Forward to Improve Predictions of Productivity Under Elevated CO2: Ensemble-Based Model Intercomparison and Benchmarking Using the Predictive Ecosystem Analyser (633530)
Elizabeth Cowdery1, Michael Dietze1 and PEcAn Project, (1)Boston University, Boston, MA, United States
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