干旱区生态环境知识资源中心(Arid): Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem

Arid

DOI	10.1016/j.ecolind.2020.106730
	Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem
	Hao, Guangcun; Hu, Zhongmin; Di, Kai; Li, Shenggong
通讯作者	Hu, ZM
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2020
卷号	118
英文摘要	Rainfall pulses play a key role in dominating the ecosystem carbon balance in arid and semiarid regions. In the future, the intensity and frequency of rainfall events will be significantly altered. Therefore, discussing the response of the carbon balance to rainfall pulses is extremely important for predicting the effect of global change on the carbon cycle. In grasslands, previous studies have documented that there is a threshold of rainfall size, above which net ecosystem exchange (NEE) would shift from positive (carbon source) to negative (carbon sink). However, does this threshold exist under altered intra-annual rainfall timing during growing season? To answer this question, we conducted an experiment in a typical grassland ecosystem to detect the relationship between rainfall pulse and carbon balance during the growing seasons from 2012 to 2015. Our studies showed that there was no rainfall threshold for the NEE from carbon source to sink with the change in rainfall timing. In the early growing season, there was a positive relationship (carbon source) between the NEE and rainfall pulses. In the middle growing season, there was a negative relationship (carbon sink) between the NEE and rainfall pulses. Moreover, the response magnitude of the NEE was positively related to the activity duration differences between ecosystem respiration (ER) and gross primary productivity (GPP). This study provided a new perspective on the proximate causes of the effects of rainfall on NEE. The mechanism underlying the response patterns of NEE to rainfall pulses is of critical importance for improving our ability to project future changes in the Earth system.
英文关键词	Climate change Rainfall pattern Grassland Ecosystem carbon balance
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000578967500027
WOS关键词	GROSS PRIMARY PRODUCTIVITY ; SOIL CO2 EFFLUX ; INTERANNUAL VARIABILITY ; PRECIPITATION PULSES ; SEMIARID GRASSLAND ; INNER-MONGOLIA ; WATER ; FLUXES ; RESPIRATION ; MOISTURE
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326813
作者单位	[Hao, Guangcun; Hu, Zhongmin; Di, Kai] South China Normal Univ, Sch Geog, Guangzhou 510631, Peoples R China; [Hu, Zhongmin] Southern Marine Sci & Engn Guangdong Lab, Zhuhai 519082, Peoples R China; [Hao, Guangcun] Guang Dong Res Ctr Smart Homeland Engn, Guangzhou 510631, Peoples R China; [Li, Shenggong] Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Synth Res Ctr Chinese Ecosystem Res Network, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China; [Li, Shenggong] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Hao, Guangcun,Hu, Zhongmin,Di, Kai,et al. Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem[J]. 中国科学院地理科学与资源研究所,2020,118.
APA	Hao, Guangcun,Hu, Zhongmin,Di, Kai,&Li, Shenggong.(2020).Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem.ECOLOGICAL INDICATORS,118.
MLA	Hao, Guangcun,et al."Rainfall pulse response of carbon exchange to the timing of natural intra-annual rainfall in a temperate grass ecosystem".ECOLOGICAL INDICATORS 118(2020).