气候变化领域集成服务门户(CCPortal): Disentangling the Effects of Vapor Pressure Deficit and Soil Water Availability on Canopy Conductance in a Seasonal Tropical Forest During the 2015 El Niño Drought

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DOI	10.1029/2021JD035004
	Disentangling the Effects of Vapor Pressure Deficit and Soil Water Availability on Canopy Conductance in a Seasonal Tropical Forest During the 2015 El Niño Drought
	Fang Y.; Leung L.R.; Wolfe B.T.; Detto M.; Knox R.G.; McDowell N.G.; Grossiord C.; Xu C.; Christoffersen B.O.; Gentine P.; Koven C.D.; Chambers J.Q.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	Water deficit in the atmosphere and soil are two key interactive factors that constrain transpiration and vegetation productivity. It is not clear which of these two factors is more important for the water and carbon flux response to drought stress in ecosystems. In this study, field data and numerical modeling were used to isolate their impact on evapotranspiration (ET) and gross primary productivity (GPP) at a tropical forest site in Barro Colorado Island (BCI), Panama, focusing on their response to the drought induced by the El Niño event of 2015–2016. Numerical simulations were performed using a plant hydrodynamic scheme (HYDRO) and a heuristic approach that ignores stomatal sensitivity to leaf water potential in the Energy Exascale Earth System Model (E3SM) Land Model (ELM). The sensitivity of canopy conductance (Gs) to vapor pressure deficit (VPD) obtained from eddy-covariance fluxes and measured sap flux shows that, at both ecosystem and plant scale, soil water stress is more important in limiting Gs than VPD at BCI during the El Niño event. The model simulations confirmed the importance of water stress limitation on Gs, but overestimated the VPD impact on Gs compared to that estimated from the observations. We also found that the predicted soil moisture is less sensitive to the diversity of plant hydraulic traits than ET and GPP. During the dry season at BCI, seasonal ET, especially soil evaporation at VPD > 0.42 kPa, simulated using HYDRO and ELM, were too strong and will require alternative parameterizations. © 2021. Battelle Memorial Institute.
英文关键词	canopy conductance limitation; ELM; plant hydrodynamic model HYDRO; tropical forest; vapor pressure deficit; water stress
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185201
作者单位	Pacific Northwest National Laboratory, Richland, WA, United States; Smithsonian Tropical Research Institute, School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA, United States; Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, United States; Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland; Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, United States; Department of Biology, University of Texas Rio Grande Valley, Edinburg, TX, United States; Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	Fang Y.,Leung L.R.,Wolfe B.T.,et al. Disentangling the Effects of Vapor Pressure Deficit and Soil Water Availability on Canopy Conductance in a Seasonal Tropical Forest During the 2015 El Niño Drought[J],2021,126(10).
APA	Fang Y..,Leung L.R..,Wolfe B.T..,Detto M..,Knox R.G..,...&Chambers J.Q..(2021).Disentangling the Effects of Vapor Pressure Deficit and Soil Water Availability on Canopy Conductance in a Seasonal Tropical Forest During the 2015 El Niño Drought.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Fang Y.,et al."Disentangling the Effects of Vapor Pressure Deficit and Soil Water Availability on Canopy Conductance in a Seasonal Tropical Forest During the 2015 El Niño Drought".Journal of Geophysical Research: Atmospheres 126.10(2021).