干旱区生态环境知识资源中心(Arid): Indirect effects of water availability in driving and predicting productivity in the Gobi desert

Arid

DOI	10.1016/j.scitotenv.2019.133952
	Indirect effects of water availability in driving and predicting productivity in the Gobi desert
	Xu, Kang 1; He, Lingchao 1; Hu, Hanjian 1; Wang, Zhiwei 1; Lin, Maozi 1,2; Liu, Shun 1; Du, Yuanyuan 1; Li, Yan1,3 ; Wang, Genxuan 1
通讯作者	Wang, Genxuan
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	697
英文摘要	Climate is the fundamental determinant of plant metabolism and net primary productivity (NPP). However, whether climate drives NPP directly or indirectly is not well understand. The Gobi desert across a precipitation gradient in the arid zone provides an ideal naturally-controlled platform for studying the precipitation-productivity relationships. We conducted 3-year experiments in four Gobi desert shrublands across an aridity gradient in Gansu Province of China to test the relationship between water availability and shrub productivity as well as the relative importance of the possible factors driving productivity (using piecewise structural equation modeling) and to explore the appropriate variables for predicting productivity (using three spatial models). The results showed that water availability indirectly affected the NPP via stand biomass, while stand biomass had a significant direct effect on NPP regardless of whether the leaf water content and stand height were considered. The model based on stand size (71.6%) and the model that contained both stand size and water availability (72.3%) explained more of the variation in the water-NPP relationships than the model based on water availability (37.3%). Our findings suggest that even in extremely water-limited areas, the effects of water availability on plant growth and the kinetics of plant metabolism could be indirect via plant size, demonstrating the importance of plant size as an indicator of shrub productivity. This study explains the mechanisms underlying the NPP driving pattern and proposes a practical NPP model for arid ecosystems. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Net primary productivity Stand size Water availability Stand height Leaf water content Piecewise structural equation model
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000499668600047
WOS关键词	TERRESTRIAL PLANT-PRODUCTION ; NET PRIMARY PRODUCTION ; CLIMATE-CHANGE ; MODEL ; NPP ; CONVERGENCE ; GRASSLANDS ; FRAMEWORK ; RESPONSES ; LEGACIES
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-12-20
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311884
作者单位	1.Zhejiang Univ, Coll Life Sci, Hangzhou 310058, Zhejiang, Peoples R China; 2.Fujian Prov Univ, Fujian Normal Univ, Fuqing Branch, Key Lab Measurement & Control Syst Coastal Basin, Fuqing 350300, Peoples R China; 3.Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Xu, Kang,He, Lingchao,Hu, Hanjian,et al. Indirect effects of water availability in driving and predicting productivity in the Gobi desert[J],2019,697.
APA	Xu, Kang.,He, Lingchao.,Hu, Hanjian.,Wang, Zhiwei.,Lin, Maozi.,...&Wang, Genxuan.(2019).Indirect effects of water availability in driving and predicting productivity in the Gobi desert.SCIENCE OF THE TOTAL ENVIRONMENT,697.
MLA	Xu, Kang,et al."Indirect effects of water availability in driving and predicting productivity in the Gobi desert".SCIENCE OF THE TOTAL ENVIRONMENT 697(2019).