DOI: 10.1111/gcb.13161
论文题名: Not all droughts are created equal: The impacts of interannual drought pattern and magnitude on grassland carbon cycling
作者: Hoover D.L. ; Rogers B.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 5 起始页码: 1809
结束页码: 1820
语种: 英语
英文关键词: Carbon fluxes
; Climate change
; Climate extremes
; Drought
; Ecosystem respiration
; Grassland
; Gross primary production
Scopus关键词: annual variation
; carbon flux
; carbon sequestration
; climate change
; drought
; extreme event
; grassland
; primary production
; respiration
; Great Plains
; United States
; carbon cycle
; climate change
; drought
; grassland
; Kansas
; theoretical model
; Carbon Cycle
; Climate Change
; Droughts
; Grassland
; Kansas
; Models, Theoretical
英文摘要: Climate extremes, such as drought, may have immediate and potentially prolonged effects on carbon cycling. Grasslands store approximately one-third of all terrestrial carbon and may become carbon sources during droughts. However, the magnitude and duration of drought-induced disruptions to the carbon cycle, as well as the mechanisms responsible, remain poorly understood. Over the next century, global climate models predict an increase in two types of drought: chronic but subtle 'press-droughts', and shorter term but extreme 'pulse-droughts'. Much of our current understanding of the ecological impacts of drought comes from experimental rainfall manipulations. These studies have been highly valuable, but are often short term and rarely quantify carbon feedbacks. To address this knowledge gap, we used the Community Land Model 4.0 to examine the individual and interactive effects of pulse- and press-droughts on carbon cycling in a mesic grassland of the US Great Plains. A series of modeling experiments were imposed by varying drought magnitude (precipitation amount) and interannual pattern (press- vs. pulse-droughts) to examine the effects on carbon storage and cycling at annual to century timescales. We present three main findings. First, a single-year pulse-drought had immediate and prolonged effects on carbon storage due to differential sensitivities of ecosystem respiration and gross primary production. Second, short-term pulse-droughts caused greater carbon loss than chronic press-droughts when total precipitation reductions over a 20-year period were equivalent. Third, combining pulse- and press-droughts had intermediate effects on carbon loss compared to the independent drought types, except at high drought levels. Overall, these results suggest that interannual drought pattern may be as important for carbon dynamics as drought magnitude and that extreme droughts may have long-lasting carbon feedbacks in grassland ecosystems. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61402
Appears in Collections: 影响、适应和脆弱性
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作者单位: US Geological Survey, Southwest Biological Center, 2290 SW Resource Blvd., Moab, UT, United States; Woods Hole Research Center, 149 Woods Hole Road, Falmouth, MA, United States
Recommended Citation:
Hoover D.L.,Rogers B.M.. Not all droughts are created equal: The impacts of interannual drought pattern and magnitude on grassland carbon cycling[J]. Global Change Biology,2016-01-01,22(5)