Asymmetric sensitivity of ecosystem carbon and water processes in response to precipitation change in a semi-arid steppe

doi:10.1007/s00128-017-2163-x

	Asymmetric sensitivity of ecosystem carbon and water processes in response to precipitation change in a semi-arid steppe
	Zhang, Bingwei 1; Tan, Xingru 1; Wang, Shanshan 1; Chen, Minling 2; Chen, Shiping; Ren, Tingting ; Xia, Jianyang 3; Bai, Yongfei; Huang, Jianhui; Han, Xingguo
	2017
发表期刊	FUNCTIONAL ECOLOGY
ISSN	0269-8463
卷号	31 期号:6 页码:1301-1311
摘要	Semi-arid ecosystems play an important role in regulating the dynamics of the global terrestrial CO2 sink. These dynamics are mainly driven by increasing inter-annual precipitation variability. However, how ecosystem carbon processes respond to changes in precipitation is not well understood, due to a lack of substantial experimental evidence that combines increased and decreased precipitation treatments. This study, a 3-year field manipulation experiment with five precipitation levels conducted in a semi-arid steppe, examined the impacts of increased and decreased precipitation on ecosystem CO2 (GEP: gross ecosystem photosynthesis; ER: ecosystem respiration; NEE: net ecosystem CO2 exchange), water exchange (ET: evapotranspiration), and resource use efficiency (CUE: carbon use efficiency; WUE: water use efficiency). We found that decreased precipitation reduced ecosystem CO2, water exchange and resource use efficiency significantly, while increased precipitation did not cause significant influence on them. That is, they responded more sensitively to decreased precipitation. Soil water availability was the most important driver determining changes in GEP, ER and ET. Changes in NEE, CUE and WUE were predominately regulated by soil temperature. Photosynthesis at leaf and ecosystem levels showed significantly greater sensitivity to changed precipitation than respiration and ET, and therefore determined the trends of net carbon uptake and resource use efficiency. This study highlighted an asymmetric response of ecosystem carbon and water processes to altered precipitation. This is potentially important for improving our understanding of how possible future changes in precipitation will affect the carbon cycle. Taking this asymmetric response into consideration will inevitably reduce uncertainties in predicting the dynamics of the global carbon cycle. A is available for this article.
关键词	altered precipitation carbon use efficiency ecosystem CO2 exchanges evapotranspiration nonlinear response water use efficiency
学科领域	Environmental Sciences & Ecology ; Toxicology
DOI	10.1007/s00128-017-2163-x
收录类别	SCI
语种	英语
WOS关键词	USE EFFICIENCY ; TEMPERATE STEPPE ; CLIMATE-CHANGE ; TERRESTRIAL ECOSYSTEMS ; GRASSLAND ECOSYSTEM ; NITROGEN ADDITION ; DIFFERENTIAL RESPONSES ; PLANT RESPIRATION ; SOIL RESPIRATION ; INNER-MONGOLIA
WOS记录号	WOS:000411900300005
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1365-2435
资助机构	National Program on Key Research Project of China [2016YFC0500703, 2016YFC0500103] ; 'Strategic Priority Research Program - Climate Change: Carbon Budget and Relevant Issues' of the Chinese Academy of Sciences [XDA05050402]
作者邮箱	spchen@ibcas.ac.cn
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22010
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Jinan Univ, Coll Chinese Language & Culture, Guangzhou 510610, Guangdong, Peoples R China 4.East China Normal Univ, Tiantong Natl Forest Ecosyst Observat & Res Stn, Sch Ecol & Environm Sci, Shanghai 200062, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Bingwei,Tan, Xingru,Wang, Shanshan,et al. Asymmetric sensitivity of ecosystem carbon and water processes in response to precipitation change in a semi-arid steppe[J]. FUNCTIONAL ECOLOGY,2017,31(6):1301-1311.
APA	Zhang, Bingwei.,Tan, Xingru.,Wang, Shanshan.,Chen, Minling.,Chen, Shiping.,...&Han, Xingguo.(2017).Asymmetric sensitivity of ecosystem carbon and water processes in response to precipitation change in a semi-arid steppe.FUNCTIONAL ECOLOGY,31(6),1301-1311.
MLA	Zhang, Bingwei,et al."Asymmetric sensitivity of ecosystem carbon and water processes in response to precipitation change in a semi-arid steppe".FUNCTIONAL ECOLOGY 31.6(2017):1301-1311.

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