DOI: 10.1111/gcb.14480
Scopus记录号: 2-s2.0-85056902567
论文题名: Effect of interannual precipitation variability on dryland productivity: A global synthesis
作者: Gherardi L.A. ; Sala O.E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 1 起始页码: 269
结束页码: 276
语种: 英语
英文关键词: aboveground net primary production
; climate change
; interannual variability
; legacy effect
; nonlinear response
; precipitation
; soil water
Scopus关键词: aboveground production
; annual variation
; climate change
; net primary production
; precipitation (climatology)
; soil water
; rain
; snow
; biomass
; desert climate
; drought
; grassland
; season
; Biomass
; Desert Climate
; Droughts
; Grassland
; Rain
; Seasons
; Snow
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. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117549
Appears in Collections: 气候变化与战略
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Recommended Citation:
Gherardi L.A.,Sala O.E.. Effect of interannual precipitation variability on dryland productivity: A global synthesis[J]. Global Change Biology,2019-01-01,25(1)