气候变化领域集成服务门户(CCPortal): Seasonal responses of terrestrial ecosystem water-use efficiency to climate change

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DOI	10.1111/gcb.13180
	Seasonal responses of terrestrial ecosystem water-use efficiency to climate change
	Huang, Mengtian; Piao, Shilong; Zeng, Zhenzhong; Peng, Shushi; Ciais, Philippe; Cheng, Lei; Mao, Jiafu; Poulter, Ben; Shi, Xiaoying; Yao, Yitong; Yang, Hui; Wang, Yingping
通讯作者	Piao, SL (通讯作者)
发表日期	2016
ISSN	1354-1013
EISSN	1365-2486
起始页码	2165
结束页码	2177
卷号	22 期号:6
英文摘要	Ecosystem water-use efficiency (EWUE) is an indicator of carbon-water interactions and is defined as the ratio of carbon assimilation (GPP) to evapotranspiration (ET). Previous research suggests an increasing long-term trend in annual EWUE over many regions and is largely attributed to the physiological effects of rising CO2. The seasonal trends in EWUE, however, have not yet been analyzed. In this study, we investigate seasonal EWUE trends and responses to various drivers during 1982-2008. The seasonal cycle for two variants of EWUE, water-use efficiency (WUE, GPP/ET), and transpiration-based WUE (WUEt, the ratio of GPP and transpiration), is analyzed from 0.5 degrees gridded fields from four process-based models and satellite-based products, as well as a network of 63 local flux tower observations. WUE derived from flux tower observations shows moderate seasonal variation for most latitude bands, which is in agreement with satellite-based products. In contrast, the seasonal EWUE trends are not well captured by the same satellite-based products. Trend analysis, based on process-model factorial simulations separating effects of climate, CO2, and nitrogen deposition (NDEP), further suggests that the seasonal EWUE trends are mainly associated with seasonal trends of climate, whereas CO2 and NDEP do not show obvious seasonal difference in EWUE trends. About 66% grid cells show positive annual WUE trends, mainly over mid-and high northern latitudes. In these regions, spring climate change has amplified the effect of CO2 in increasing WUE by more than 0.005 gC m(-2) mm(-1) yr(-1) for 41% pixels. Multiple regression analysis further shows that the increase in springtime WUE in the northern hemisphere is the result of GPP increasing faster than ET because of the higher temperature sensitivity of GPP relative to ET. The partitioning of annual EWUE to seasonal components provides new insight into the relative sensitivities of GPP and ET to climate, CO2, and NDEP.
关键词	DIFFERENCE VEGETATION INDEX GRASSLAND ECOSYSTEMS EDDY COVARIANCE FOREST NORTHERN VARIABILITY TRENDS CO2 EVAPOTRANSPIRATION PRODUCTIVITY
英文关键词	climate change; CO2 enrichment; process-based model; seasonal variation; terrestrial ecosystem; water-use efficiency
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:000378721700014
来源期刊	GLOBAL CHANGE BIOLOGY
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/258869
推荐引用方式 GB/T 7714	Huang, Mengtian,Piao, Shilong,Zeng, Zhenzhong,et al. Seasonal responses of terrestrial ecosystem water-use efficiency to climate change[J]. 中国科学院青藏高原研究所,2016,22(6).
APA	Huang, Mengtian.,Piao, Shilong.,Zeng, Zhenzhong.,Peng, Shushi.,Ciais, Philippe.,...&Wang, Yingping.(2016).Seasonal responses of terrestrial ecosystem water-use efficiency to climate change.GLOBAL CHANGE BIOLOGY,22(6).
MLA	Huang, Mengtian,et al."Seasonal responses of terrestrial ecosystem water-use efficiency to climate change".GLOBAL CHANGE BIOLOGY 22.6(2016).