Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China |
| |
| Affiliation: | 1. Synthesis Research Center of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;3. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;1. Laboratorio de Ecología Funcional – Departamento de Ecología Genética y Evolución, FCEN, Universidad de Buenos Aires, Argentina;2. Laboratorio de Ecología Forestal y Ecofisiología, Instituto de Biología Subtropical, CONICET – Universidad Nacional de Misiones, Facultad de Ciencias Forestales, Argentina;3. Grupo de Estudios Biofísicos y Ecofisiológicos – FCN, Universidad Nacional de la Patagonia SJB, Argentina;4. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, USA;5. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China;6. Department of Biology, University of Miami, USA;1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China;2. Department of Plant Ecology, University of Bayreuth, 95440 Bayreuth, Germany;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Cary Institute of Ecosystem Studies, Box AB, Millbrook, NY 12545, United States;2. Department of Earth and Planetary Sciences, University of New Mexico Albuquerque, NM 87131, United States;1. Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China;2. School of Environmental Studies, China University of Geosciences at Wuhan, 430074, China;3. Beijing Institute of Applied Meteorology, Beijing, 100029, China;1. Shenzhen Engineering Laboratory for Water Desalination with Renewable Energy, School of Environment and Energy, Peking University, Shenzhen 518055, China;2. Jiuzhaigou Administration Bureau, Jiuzhaigou County 623402, Aba Prefecture, Sichuan Province, China;3. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Department of Water Resources and Environment, School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China;1. The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, 02543, USA;2. Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR, 97331, USA;3. School of Life Sciences, Nanjing University, Nanjing, Jiangsu, 210037, China;4. Laboratory of Hydrology and Water Management, Ghent University, B-9000 Ghent, Belgium;5. Pacific Northwest National Laboratory, Joint Global Change Research Institute, 5825 University Research Court, College Park, MD, 20740, USA |
| |
| Abstract: | Evapotranspiration (ET), which is comprised by evaporation from soil surface (E), transpiration (T) and evaporation from the intercepted water by canopy (EI), plays an important role in maintaining global energy balance and regulating climate. Quantifying the spatiotemporal variations of T/ET (the ratio of T to ET) can improve our understandings on the role of vegetation ecophysiological processes in climate regulation. Using eddy covariance measurements at three forest ecosystems (Changbaishan temperate broad-leaved Korean pine mixed forest (CBS), Qianyanzhou subtropical coniferous plantation (QYZ) and Dinghushan subtropical evergreen mixed forest (DHS)) in north–south transect of Eastern China (NSTEC), we run the revised Shuttleworth–Wallace model (S–W model), validated its performance with the water vapor fluxes measured at two layers, and quantified the spatiotemporal variations of T/ET. The S–W model performed well in simulating ET and T/ET. The mean value of annual T/ET at three forests during the observation period all exceeded 0.6. The diurnal variation of canopy stomal conductance (Gc) dominated that of T/ET. The seasonal dynamics of T/ET was mainly shaped by that of leaf area index (LAI), vapor pressure deficit (VPD) and air temperature (Ta) through altering Gc and the portion that the energy absorbed by canopy (PEC) at temperate forest (CBS), while the seasonal dynamics of T/ET at subtropical forests (QYZ and DHS) were mainly affected by Ta, net radiation, VPD, and soil water content through altering Gc and soil surface conductance (Gs). The variation of mean annual Gc governed the interannual varaition and spatial variation of T/ET. Therefore, forests in Eastern China played an important role in regulating climate through T and Gc primarily affected the spatial and temproal variations of the role of forest T in regulating climate. |
| |
| Keywords: | Eddy covariance Shuttleworth–Wallace model Evapotranspiration Forest |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
