气候变化领域集成服务门户(CCPortal): Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models

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DOI	10.1111/geb.12411
	Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models
	Sun, Yan; Piao, Shilong; Huang, Mengtian; Ciais, Philippe; Zeng, Zhenzhong; Cheng, Lei; Li, Xiran; Zhang, Xinping; Mao, Jiafu; Peng, Shushi; Poulter, Benjamin; Shi, Xiaoying; Wang, Xuhui; Wang, Ying-Ping; Zeng, Hui
通讯作者	Piao, SL (通讯作者)
发表日期	2016
ISSN	1466-822X
EISSN	1466-8238
起始页码	311
结束页码	323
卷号	25 期号:3
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.
关键词	STOMATAL CONDUCTANCE EDDY COVARIANCE VEGETATION NITROGEN MODIS PLANT CO2 EVAPOTRANSPIRATION BIOSPHERE CANOPY
英文关键词	Climate drivers; inherent water-use efficiency; process-based model; satellite-based datasets; transpiration-based water-use efficiency; water-use efficiency
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
WOS类目	Ecology ; Geography, Physical
WOS记录号	WOS:000371436200006
来源期刊	GLOBAL ECOLOGY AND BIOGEOGRAPHY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258870
推荐引用方式 GB/T 7714	Sun, Yan,Piao, Shilong,Huang, Mengtian,et al. Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models[J]. 中国科学院青藏高原研究所,2016,25(3).
APA	Sun, Yan.,Piao, Shilong.,Huang, Mengtian.,Ciais, Philippe.,Zeng, Zhenzhong.,...&Zeng, Hui.(2016).Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models.GLOBAL ECOLOGY AND BIOGEOGRAPHY,25(3).
MLA	Sun, Yan,et al."Global patterns and climate drivers of water-use efficiency in terrestrial ecosystems deduced from satellite-based datasets and carbon cycle models".GLOBAL ECOLOGY AND BIOGEOGRAPHY 25.3(2016).