干旱区生态环境知识资源中心(Arid): The effect of water stress on net primary productivity in northwest China

Arid

DOI	10.1007/s11356-021-15314-2
	The effect of water stress on net primary productivity in northwest China
	Zhang, Zhenyu; Ju, Weimin; Zhou, Yanlian
通讯作者	Ju, WM (corresponding author), Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210023, Peoples R China.
来源期刊	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN	0944-1344
EISSN	1614-7499
出版年	2021-07
英文摘要	Net primary productivity (NPP) has been widely used as the indicator of vegetation function and exhibits large spatial and temporal variations caused by numerous factors. Northwest China (NWC) is one of the driest regions in China, and water supply is the key determinant of NPP here. However, studies on the effects of water stress on NPP in NWC at the regional scale are still relatively lacking. Thus, in this study, based on a set of Moderate-Resolution Imaging Spectroradiometer (MODIS) NPP and evapotranspiration (ET) datasets, we quantified the response of NPP to water stress, which is indicated by crop water stress index (CWSI). Regional average of annual NPP in NWC showed an increasing trend during the study period, at a rate of 0.84 g C m(-2) yr(-1). At the province level, the NPP increase rates increased in the order of Ningxia (7.7%), Shaanxi (6.5%), Gansu (4.5%), Qinghai (3.8%), and Xinjiang (1.7%). NPP was negatively correlated with CWSI (p<0.05) in 73% of areas, indicating the key role of water stress in constraining NPP over this arid region. The effect of water stress on NPP changes with elevation. Water stress has the strongest negative impact on NPP in areas with elevations around 2000 m. In elevations above 5000 m, NPP is not limited by water stress, mostly positively correlated with CWSI. Our findings further clarify the importance of water stress in dryland ecosystems, while highlighting that elevation gradients can significantly affect the correlation between NPP and water stress.
英文关键词	Net primary productivity Crop water stress index Water stress Elevation gradient Arid region Northwest China
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000679275700007
WOS关键词	QINGHAI-TIBET PLATEAU ; CLIMATE-CHANGE ; TERRESTRIAL ECOSYSTEMS ; USE EFFICIENCY ; COVER CHANGE ; LAND-COVER ; MODIS ; EVAPOTRANSPIRATION ; TEMPERATURE ; DROUGHT
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	南京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363167
作者单位	[Zhang, Zhenyu; Ju, Weimin] Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210023, Peoples R China; [Zhang, Zhenyu; Zhou, Yanlian] Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210023, Peoples R China; [Zhang, Zhenyu] Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zhenyu,Ju, Weimin,Zhou, Yanlian. The effect of water stress on net primary productivity in northwest China[J]. 南京大学,2021.
APA	Zhang, Zhenyu,Ju, Weimin,&Zhou, Yanlian.(2021).The effect of water stress on net primary productivity in northwest China.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH.
MLA	Zhang, Zhenyu,et al."The effect of water stress on net primary productivity in northwest China".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2021).