干旱区生态环境知识资源中心(Arid): Aboveground net primary productivity not CO2 exchange remain stable under three timing of extreme drought in a semi-arid steppe

Arid

DOI	10.1371/journal.pone.0214418
	Aboveground net primary productivity not CO2 exchange remain stable under three timing of extreme drought in a semi-arid steppe
	Zhang, Hui 1,2; Yu, Hua 3; Zhou, Chaoting 2; Zhao, Haitao 4; Qian, Xiaoqing 1,4
通讯作者	Qian, Xiaoqing
来源期刊	PLOS ONE
ISSN	1932-6203
出版年	2019
卷号	14 期号:3
英文摘要	Precipitation patterns are expected to change in the semi-arid region within the next decades, with projected increasing in extreme drought events. Meanwhile, the timing of extreme drought also shows great uncertainty, suggesting that the timing of drought, especially during growing season, may subsequently impose stronger stress on ecosystem functions than drought itself. However, how the timing of extreme drought will impact on community productivity and carbon cycle is still not clear. In this study, three timing of extreme drought (a consecutive 30-day period without precipitation event) experiments were set up separately in early-, mid- and late-growing season in a temperate steppe in Inner Mongolia since 2013. The data, including soil water content (SWC), soil temperature (ST) chlorophyll fluorescence parameter (F-t/F-m), ecosystem respiration (Re), gross primary productivity (GPP), net ecosystem carbon absorption (NEE) and aboveground net primary productivity (ANPP) were collected in growing season (from May to September) of 2016. In this study, extreme drought significantly decreased SWC during the drought treatment but not for the whole growing season. Extreme drought decreased maximum quantum efficiency of plant photosystem II (F-t/F-m) under optimum value (0.75-0.85) of two dominant species (Leymus chinensis and Stipa grandis). While ANPP kept stable under extreme drought treatments due to the different responses of two dominant species, which brought a compensating effect in relative abundance and biomass. In addition, only early-growing season drought significantly decreased the average Re (P < 0.01) and GPP (P < 0.01) and depressed net CO2 uptake (P < 0.01) than mid- and late-growing season drought. ST and SWC influenced the changes of GPP directly and indirectly through photosynthetic ability of the dominant species by path analysis. Our results indicated that the timing of drought should be considered in carbon cycle models to accurately estimate carbon exchange and productivity of semi-arid grasslands in the context of changing climate.
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Submitted, Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000462305600058
WOS关键词	LEYMUS CHINENSIS STEPPE ; CLIMATE EXTREMES ; CHLOROPHYLL FLUORESCENCE ; INNER-MONGOLIA ; PRECIPITATION PULSE ; ECOSYSTEM CARBON ; WEATHER EVENTS ; GROWING-SEASON ; RESPIRATION ; GRASSLAND
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218092
作者单位	1.Yangzhou Univ, Coll Biosci & Biotechnol, Yangzhou, Jiangsu, Peoples R China; 2.Univ Chinese Acad Sci, Coll Life Sci, Beijing, Peoples R China; 3.Univ Chinese Acad Sci, Dept Foreign Languages, Beijing, Peoples R China; 4.Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Hui,Yu, Hua,Zhou, Chaoting,et al. Aboveground net primary productivity not CO2 exchange remain stable under three timing of extreme drought in a semi-arid steppe[J],2019,14(3).
APA	Zhang, Hui,Yu, Hua,Zhou, Chaoting,Zhao, Haitao,&Qian, Xiaoqing.(2019).Aboveground net primary productivity not CO2 exchange remain stable under three timing of extreme drought in a semi-arid steppe.PLOS ONE,14(3).
MLA	Zhang, Hui,et al."Aboveground net primary productivity not CO2 exchange remain stable under three timing of extreme drought in a semi-arid steppe".PLOS ONE 14.3(2019).