HR: 17:20h
AN: B44B-06    [Abstracts]
TI: Evidence of Shifted Soil Moisture Sensitivity of Soil Respiration Under Warming in a Tallgrass Prairie
AU: * Hui, D
EM: dafeng@ou.edu
AF: University of Oklahoma, Department of Botany & Microbiology, Norman, OK 73019 United States
AU: Luo, Y
EM: yluo@ou.edu
AF: University of Oklahoma, Department of Botany & Microbiology, Norman, OK 73019 United States
AU: Wan, S
EM: wans@ornl.gov
AF: Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN 37831 United States
AU: Xu, T
EM: tao.xu-2@ou.edu
AF: University of Oklahoma, Department of Mathematics, Norman, OK 73019 United States
AU: Saleska, S R
EM: saleska@fas.harvard.edu
AF: Harvard University, Deptartment of Earth & Planetary Sciences, Cambridge, MA 02139 United States
AU: Zhou, X
EM: zxuhui14@ou.edu
AF: University of Oklahoma, Department of Botany & Microbiology, Norman, OK 73019 United States
AU: Sherry, R A
EM: rsherry@ou.edu
AF: University of Oklahoma, Department of Botany & Microbiology, Norman, OK 73019 United States
AU: Su, B
EM: bosu@ou.edu
AF: University of Oklahoma, Department of Botany & Microbiology, Norman, OK 73019 United States
AU: Wallace, L L
EM: lwallace@ou.edu
AF: University of Oklahoma, Department of Botany & Microbiology, Norman, OK 73019 United States
AB: Although recent studies have demonstrated that climate warming has shifted temperature sensitivity of soil respiration, it is still not clear how climate warming will influence the soil moisture sensitivity of soil respiration. In this study, we quantify the threshold values of soil moisture sensitivity in a four year warming experiment and provide evidence that climate warming changes soil moisture sensitivity of soil respiration. The shifted soil moisture sensitivity could allow more carbon released from soils under warming, compensate warming-induced thermal acclimation, and add a positive feedback to global carbon cycling. Uncertainty analysis further confirms the shift in distributions of soil moisture sensitivity of soil respiration. Considering global warming will change the precipitation amounts, spatial distributions, and seasonal patterns, likely inducing more summer drought in the temperate areas, the decreased soil moisture sensitivity of soil respiration under warming could be critical in accurately predicting feedback effects of terrestrial ecosystems on climate warming.
DE: 1866 Soil moisture
DE: 1600 GLOBAL CHANGE (New category)
DE: 1615 Biogeochemical processes (4805)
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting