Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow
Quan, Q; Zhang, FY; Tian, DS; Zhou, QP; Wang, LX; Niu, SL
2018
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
Volume123Issue:2Pages:453-462
AbstractAs 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 (T-soil) at 10cm on average by 1.65 and 2.77 degrees C, but decreased soil moisture (M-soil) by 2.52 and 7.6vol %, 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.
SubtypeJournal
Keywordwarming water-use efficiency ecosystem transpiration carbon water alpine meadow
Subject AreaEnvironmental Sciences & Ecology ; Geology
WOS Subject ExtendedEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS KeywordCARBON-DIOXIDE ; TEMPERATE STEPPE ; SOIL RESPIRATION ; CLIMATE-CHANGE ; GLOBAL CHANGE ; TERRESTRIAL ECOSYSTEMS ; GRASSLAND ECOSYSTEMS ; VEGETATION CONTROL ; TALLGRASS PRAIRIE ; CO2 ENRICHMENT
Indexed BySCI
Language英语
WOS IDWOS:000427478500009
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43926
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Quan, Q,Zhang, FY,Tian, DS,et al. Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2018,123(2):453-462.
APA Quan, Q,Zhang, FY,Tian, DS,Zhou, QP,Wang, LX,&Niu, SL.(2018).Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,123(2),453-462.
MLA Quan, Q,et al."Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 123.2(2018):453-462.
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