干旱区生态环境知识资源中心(Arid): Effect of interannual precipitation variability on dryland productivity: A global synthesis

Arid

DOI	10.1111/gcb.14480
	Effect of interannual precipitation variability on dryland productivity: A global synthesis
	Gherardi, Laureano A.1,3; Sala, Osvaldo E.1,2,3
通讯作者	Gherardi, Laureano A.
来源期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
EISSN	1365-2486
出版年	2019
卷号	25 期号:1 页码:269-276
英文摘要	Climate-change assessments project increasing precipitation variability through increased frequency of extreme events. However, the effects of interannual precipitation variance per se on ecosystem functioning have been largely understudied. Here, we report on the effects of interannual precipitation variability on the primary production of global drylands, which include deserts, steppes, shrublands, grasslands, and prairies and cover about 40% of the terrestrial earth surface. We used a global database that has 43 datasets, which are uniformly distributed in parameter space and each has at least 10 years of data. We found (a) that at the global scale, precipitation variability has a negative effect on aboveground net primary production. (b) Expected increases in interannual precipitation variability for the year 2,100 may result in a decrease of up to 12% of the global terrestrial carbon sink. (c) The effect of precipitation interannual variability on dryland productivity changes from positive to negative along a precipitation gradient. Arid sites with mean precipitation under 300 mm/year responded positively to increases in precipitation variability, whereas sites with mean precipitation over 300 mm/year responded negatively. We propose three complementary mechanisms to explain this result: (a) concave-up and concave-down precipitation-production relationships in arid vs. humid systems, (b) shift in the distribution of water in the soil profile, and (c) altered frequency of positive and negative legacies. Our results demonstrated that enhanced precipitation variability will have direct impacts on global drylands that can potentially affect the future terrestrial carbon sink.
英文关键词	aboveground net primary production climate change interannual variability legacy effect nonlinear response precipitation soil water
类型	Article
语种	英语
国家	USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000453370700022
WOS关键词	NET PRIMARY PRODUCTION ; DIVERSITY ; ECOSYSTEM ; EXTREMES ; LEGACIES ; PACKAGE ; REGIMES
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	Arizona State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216080
作者单位	1.Arizona State Univ, Sch Life Sci, Tempe, AZ USA; 2.Arizona State Univ, Sch Sustainabil, Tempe, AZ USA; 3.Arizona State Univ, Global Drylands Ctr, Tempe, AZ 85287 USA
推荐引用方式 GB/T 7714	Gherardi, Laureano A.,Sala, Osvaldo E.. Effect of interannual precipitation variability on dryland productivity: A global synthesis[J]. Arizona State University,2019,25(1):269-276.
APA	Gherardi, Laureano A.,&Sala, Osvaldo E..(2019).Effect of interannual precipitation variability on dryland productivity: A global synthesis.GLOBAL CHANGE BIOLOGY,25(1),269-276.
MLA	Gherardi, Laureano A.,et al."Effect of interannual precipitation variability on dryland productivity: A global synthesis".GLOBAL CHANGE BIOLOGY 25.1(2019):269-276.