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学科主题: 生物科学::普通生物学
题名: Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models
作者: Sun, Y (Sun, Yan)1; Piao, SL (Piao, Shilong)1, 2, 3; Huang, MT (Huang, Mengtian)1; Ciais, P (Ciais, Philippe)4; Zeng, ZZ (Zeng, Zhenzhong)1; Cheng, L (Cheng, Lei)5; Li, XR (Li, Xiran)1; Zhang, XP (Zhang, Xinping)1; Mao, JF (Mao, Jiafu)6; Peng, SS (Peng, Shushi)1, 4; Poulter, B (Poulter, Benjamin)7; Shi, XY (Shi, Xiaoying)6; Wang, XH (Wang, Xuhui)1; Wang, YP (Wang, Ying-Ping)8; Zeng, H (Zeng, Hui)9
通讯作者: Piao, SL
刊名: GLOBAL ECOLOGY AND BIOGEOGRAPHY
发表日期: 2016
DOI: 10.1111/geb.12411
卷: 25, 期:3, 页:311-323
收录类别: SCI
合作性质: 国际
文章类型: Article
英文摘要: AimTo investigate how ecosystem water-use efficiency (WUE) varies spatially under different climate conditions, and how spatial variations in WUE differ from those of transpiration-based water-use efficiency (WUEt) and transpiration-based inherent water-use efficiency (IWUEt).
LocationGlobal terrestrial ecosystems.
MethodsWe investigated spatial patterns of WUE using two datasets of gross primary productivity (GPP) and evapotranspiration (ET) and four biosphere model estimates of GPP and ET. Spatial relationships between WUE and climate variables were further explored through regression analyses.
ResultsGlobal WUE estimated by two satellite-based datasets is 1.90.1 and 1.8 +/- 0.6g C m(-2)mm(-1) lower than the simulations from four process-based models (2.0 +/- 0.3g C m(-2)mm(-1)) but comparable within the uncertainty of both approaches. In both satellite-based datasets and process models, precipitation is more strongly associated with spatial gradients of WUE for temperate and tropical regions, but temperature dominates north of 50 degrees N. WUE also increases with increasing solar radiation at high latitudes. The values of WUE from datasets and process-based models are systematically higher in wet regions (with higher GPP) than in dry regions. WUEt shows a lower precipitation sensitivity than WUE, which is contrary to leaf- and plant-level observations. IWUEt, the product of WUEt and water vapour deficit, is found to be rather conservative with spatially increasing precipitation, in agreement with leaf- and plant-level measurements.
Main conclusionsWUE, WUEt and IWUEt produce different spatial relationships with climate variables. In dry ecosystems, water losses from evaporation from bare soil, uncorrelated with productivity, tend to make WUE lower than in wetter regions. Yet canopy conductance is intrinsically efficient in those ecosystems and maintains a higher IWUEt. This suggests that the responses of each component flux of evapotranspiration should be analysed separately when investigating regional gradients in WUE, its temporal variability and its trends.
语种: 英语
WOS记录号: WOS:000371436200006
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7756
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Peking Univ, Sino French Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Key Lab Alpine Ecol & Biodivers, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
3.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100085, Peoples R China
4.CEA, CNRS, UMR, LSCE,CE, Bat 709, F-91191 Gif Sur Yvette, France
5.CSIRO, Land & Water Flagship, GPO Box 1666, Canberra, ACT 2601, Australia
6.Oak Ridge Natl Lab, Div Environm Sci, Climate Change Sci Inst, POB 2008, Oak Ridge, TN 37831 USA
7.Montana State Univ, Dept Ecol, Inst Ecosyst, Bozeman, MT 59717 USA
8.CSIRO, Ocean & Atmosphere Flagship, PMB 1, Aspendale, Vic 3195, Australia
9.Peking Univ, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China

Recommended Citation:
Sun, Y ,Piao, SL ,Huang, MT ,et al. Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models[J]. GLOBAL ECOLOGY AND BIOGEOGRAPHY,2016,25(3):311-323.
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