Response of Water Use Efficiency to Global Environmental Change Based on Output From Terrestrial Biosphere Models
Zhou, S; Yu, BF; Schwalm, CR; Ciais, P; Zhang, Y; Fisher, JB; Michalak, AM; Wang, WL; Poulter, B; Huntzinger, DN; Niu, SL; Mao, JF; Jain, A; Ricciuto, DM; Shi, XY; Ito, A; Wei, YX; Huang, YF; Wang, GQ
2017
Source PublicationGLOBAL BIOGEOCHEMICAL CYCLES
ISSN0886-6236
Volume31Issue:11Pages:1639-1655
AbstractWater use efficiency (WUE), defined as the ratio of gross primary productivity and evapotranspiration at the ecosystem scale, is a critical variable linking the carbon and water cycles. Incorporating a dependency on vapor pressure deficit, apparent underlying WUE (uWUE) provides a better indicator of how terrestrial ecosystems respond to environmental changes than other WUE formulations. Here we used 20th century simulations from four terrestrial biosphere models to develop a novel variance decomposition method. With this method, we attributed variations in apparent uWUE to both the trend and interannual variation of environmental drivers. The secular increase in atmospheric CO2 explained a clear majority of total variation (6632%: meanone standard deviation), followed by positive trends in nitrogen deposition and climate, as well as a negative trend in land use change. In contrast, interannual variation was mostly driven by interannual climate variability. To analyze the mechanism of the CO2 effect, we partitioned the apparent uWUE into the transpiration ratio (transpiration over evapotranspiration) and potential uWUE. The relative increase in potential uWUE parallels that of CO2, but this direct CO2 effect was offset by 204% by changes in ecosystem structure, that is, leaf area index for different vegetation types. However, the decrease in transpiration due to stomatal closure with rising CO2 was reduced by 84% by an increase in leaf area index, resulting in small changes in the transpiration ratio. CO2 concentration thus plays a dominant role in driving apparent uWUE variations over time, but its role differs for the two constituent components: potential uWUE and transpiration.
SubtypeJournal
Keywordatmospheric CO2 attribution trend interannual variability physiology structure
Subject AreaEnvironmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS Subject ExtendedEnvironmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS KeywordLAND-USE CHANGE ; FOREST FACE SITES ; CLIMATE-CHANGE ; ELEVATED CO2 ; STOMATAL CONDUCTANCE ; NITROGEN DEPOSITION ; CARBON-CYCLE ; PRIMARY PRODUCTIVITY ; EUROPEAN FORESTS ; ATMOSPHERIC CO2
Indexed BySCI
Language英语
WOS IDWOS:000418082000002
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43983
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
Zhou, S,Yu, BF,Schwalm, CR,et al. Response of Water Use Efficiency to Global Environmental Change Based on Output From Terrestrial Biosphere Models[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2017,31(11):1639-1655.
APA Zhou, S.,Yu, BF.,Schwalm, CR.,Ciais, P.,Zhang, Y.,...&Wang, GQ.(2017).Response of Water Use Efficiency to Global Environmental Change Based on Output From Terrestrial Biosphere Models.GLOBAL BIOGEOCHEMICAL CYCLES,31(11),1639-1655.
MLA Zhou, S,et al."Response of Water Use Efficiency to Global Environmental Change Based on Output From Terrestrial Biosphere Models".GLOBAL BIOGEOCHEMICAL CYCLES 31.11(2017):1639-1655.
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