干旱区生态环境知识资源中心(Arid): Antecedent water condition determines carbon exchange response to extreme precipitation events across global drylands

Arid

DOI	10.1007/s00704-022-04134-0
	Antecedent water condition determines carbon exchange response to extreme precipitation events across global drylands
	Zhao, Huichen; Xu, Xiyan; Jia, Gensuo; Zhang, Anzhi; Wang, Hesong
通讯作者	Jia, GS
来源期刊	THEORETICAL AND APPLIED CLIMATOLOGY
ISSN	0177-798X
EISSN	1434-4483
出版年	2022
卷号	149 期号:3-4 页码:1705-1715
英文摘要	The global hydrological cycle is predicted to be intensified under the warming climate, with more extreme precipitation events and longer dry spell in between. Here, we evaluated how extreme precipitation events (EPEs) with antecedent dry (dry-EPEs) and wet (wet-EPEs) water conditions influence carbon exchange along gradient of arid, semi-arid, and sub-humid ecosystems based on eddy covariance datasets. After EPEs, ecosystem respiration and gross primary productivity (GPP) were stimulated by pulses of soil moisture in arid and semi-arid regions, but suppressed by decreased soil temperature in sub-humid region. Antecedent water condition determined asynchronous response of ecosystem respiration and GPP to EPEs, and therefore fluctuations in net carbon balance. Net carbon uptake capacity was enhanced immediately following wet-EPEs because of more rapid and greater response of GPP than respiration. However, after dry-EPEs, net carbon uptake capacity decreased immediately and increased thereafter because the response of GPP to dry-EPEs lagged behind ecosystem respiration. More antecedent precipitation further stimulated accumulative net carbon uptake. In general, the accumulated net carbon uptake within 3 weeks after wet-EPEs was two times and seven times of that after dry-EPEs in arid and semi-arid region, respectively. In sub-humid region, ecosystems acted as a carbon sink after wet-EPEs, but as a carbon source after dry-EPEs. We conclude that antecedent water conditions and local climate regimes need to be considered when interpreting the response of carbon exchange to EPEs in dryland ecosystems.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000823326100001
WOS关键词	DIFFERENTIAL RESPONSES ; RAIN PULSES ; RESPIRATION ; ECOSYSTEM ; FLUXES ; CO2 ; SEQUESTRATION ; GRASSLAND ; DROUGHT ; LEGACY
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394723
推荐引用方式 GB/T 7714	Zhao, Huichen,Xu, Xiyan,Jia, Gensuo,et al. Antecedent water condition determines carbon exchange response to extreme precipitation events across global drylands[J],2022,149(3-4):1705-1715.
APA	Zhao, Huichen,Xu, Xiyan,Jia, Gensuo,Zhang, Anzhi,&Wang, Hesong.(2022).Antecedent water condition determines carbon exchange response to extreme precipitation events across global drylands.THEORETICAL AND APPLIED CLIMATOLOGY,149(3-4),1705-1715.
MLA	Zhao, Huichen,et al."Antecedent water condition determines carbon exchange response to extreme precipitation events across global drylands".THEORETICAL AND APPLIED CLIMATOLOGY 149.3-4(2022):1705-1715.