globalchange  > 气候减缓与适应
DOI: 10.1002/2017JG004362
Scopus记录号: 2-s2.0-85042065102
论文题名:
Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow
作者: Quan Q.; Zhang F.; Tian D.; Zhou Q.; Wang L.; Niu S.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:2
起始页码: 453
结束页码: 462
语种: 英语
英文关键词: alpine meadow ; carbon ; ecosystem ; transpiration ; warming ; water ; water-use efficiency
Scopus关键词: alpine environment ; carbon flux ; climate change ; ecosystem dynamics ; global warming ; meadow ; net ecosystem production ; transpiration ; water flux ; water use efficiency
英文摘要: As a key linkage of C and water cycles, water-use efficiency (WUE) quantifies how much water an ecosystem uses for carbon gain. Although ecosystem C and water fluxes have been intensively studied, yet it remains unclear how ecosystem WUE responds to climate warming and which processes dominate the response of WUE. To answer these questions, we examined canopy WUE (WUEc), ecosystem WUE (WUEe) and their components including gross ecosystem productivity, ecosystem evapotranspiration (ET), soil evaporation (E), and plant canopy transpiration (T), in response to warming in an alpine meadow by using a manipulative warming experiment in 2015 and 2016. As expected, low- and high-level warming treatments increased soil temperature (Tsoil) at 10 cm on average by 1.65 and 2.77°C, but decreased soil moisture (Msoil) by 2.52 and 7.6 vol %, respectively, across the two years. Low- and high-level warming increased WUEe by 7.7 and 9.3% over the two years, but rarely changed WUEc in either year. T/ET ratio determined the differential responses of WUEc and WUEe. Larger T/ET led to less difference between WUEc and WUEe. By partitioning WUEc and WUEe into different carbon and water fluxes, we found that T rather than gross ecosystem productivity or E dominated the responses of WUEc and WUEe to warming. This study provides empirical insights into how ecosystem WUE responds to warming and illustrates the importance of plant transpiration in regulating ecosystem WUE under future climate change. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114592
Appears in Collections:气候减缓与适应

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作者单位: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; Institute of Qinghai-Tibetan Plateau, Southwest University for Nationalities, Chengdu, China; Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, United States

Recommended Citation:
Quan Q.,Zhang F.,Tian D.,et al. Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(2)
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