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	The sensitivity of temperate steppe co2 exchange to the quantity and timing of natural interannual rainfall
	Hao, Yanbin1; Wang, Yanfen1; Mei, Xurong3; Cui, Xiaoyong2; Zhou, Xiaoqi1; Huang, Xiangzhong1
刊名	Ecological informatics
	2010-05-01
卷号	5期号:3页码:222-228
关键词	Climate change Precipitation variation Natural precipitation patterns Ecosystem level Co2 exchange Eurasia grassland
ISSN号	1574-9541
DOI	10.1016/j.ecoinf.2009.10.002
通讯作者	Wang, yanfen()
英文摘要	Precipitation quantity and timing have been shown to fundamentally influence grassland ecosystem co2 exchange by both model simulation and field observation carbon dioxide exchange and patterns of variation (magnitude and timing) in precipitation were observed to determine their relationship in typical steppe in inner mongolia plateau during four years (2003-2006) with different rainfall patterns the response of ecosystem-level co2 fluxes to rainfall pulse events was also examined. the four years studied were classified into three levels of rainfall amount (100%. 2004, reduced by 70% in 2005 and by 45% in 2006 compared with 2004) and two temporal patterns of rain events (average temporal patterns in 2004 and altered precipitation timing in 2003, a year with precipitation fell during the first half of the growing season, compared with 2004) the grassland ecosystem switched from a carbon sink (2004) to carbon sources (2005 and 2006) under reduced rainfall amounts carbon sink reduced by 34% under variational rainfall timing conditions (2003). there was a significant positive correlation between annual rainfall and above-ground npp across the study (p=005, r(2)=0 9) antecedent soil water before rainfall pulse and rainfall pulse size are important in controlling the response of co2 exchange to rainfall in this steppe after rainfall pulse events, co2 fluxes had 4 to 5 days of system-level hysteresis and the increase degree of co2 exchange was different among the four years precipitation pulse size not only affected the duration of co2 fluxes, but also instant flux rate our results suggest that co2 exchange in temperate steppe will be more sensitive to altered rainfall timing and more affected by changes in rainfall quantity, with a longer dry season resulting in significant c losing from eurasia grassland in inner mongolia plateau (c) 2009 elsevier b v all rights reserved.
WOS关键词	CARBON-DIOXIDE FLUXES ; WATER-VAPOR EXCHANGE ; PRECIPITATION PULSES ; SEMIARID ECOSYSTEMS ; GRASSLAND ECOSYSTEM ; PLANT-RESPONSES ; CLIMATE-CHANGE ; PRAIRIE ; VARIABILITY ; PATTERNS
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000277916000008
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2406834
专题	中国科学院大学
通讯作者	Wang, Yanfen
作者单位	1.Chinese Acad Sci, Grad Univ, Coll Life Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Grad Univ, Coll Resource & Environm, Beijing 100049, Peoples R China 3.CAAS, Key Lab Dryland Farming & Water Saving Agr, MOA, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Hao, Yanbin,Wang, Yanfen,Mei, Xurong,et al. The sensitivity of temperate steppe co2 exchange to the quantity and timing of natural interannual rainfall[J]. Ecological informatics,2010,5(3):222-228.
APA	Hao, Yanbin,Wang, Yanfen,Mei, Xurong,Cui, Xiaoyong,Zhou, Xiaoqi,&Huang, Xiangzhong.(2010).The sensitivity of temperate steppe co2 exchange to the quantity and timing of natural interannual rainfall.Ecological informatics,5(3),222-228.
MLA	Hao, Yanbin,et al."The sensitivity of temperate steppe co2 exchange to the quantity and timing of natural interannual rainfall".Ecological informatics 5.3(2010):222-228.

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