DOI: 10.1007/s10584-015-1389-z
Scopus记录号: 2-s2.0-84933674339
论文题名: Enhanced precipitation variability effects on water losses and ecosystem functioning: differential response of arid and mesic regions
作者: Sala O.E. ; Gherardi L.A. ; Peters D.P.C.
刊名: Climatic Change
ISSN: 0165-0009
EISSN: 1573-1480
出版年: 2015
卷: 131, 期: 2 起始页码: 213
结束页码: 227
语种: 英语
Scopus关键词: Arid regions
; Drought
; Ecology
; Ecosystems
; Precipitation (meteorology)
; Soil moisture
; Soils
; Textures
; Differential response
; Ecosystem functioning
; Extreme precipitation events
; Intra-annual variability
; Mean annual precipitation
; Precipitation variability
; Process-based ecosystem model
; Soil water availability
; Climate change
; arid region
; climate change
; ecosystem function
; ecosystem service
; grassland
; precipitation intensity
; soil texture
; soil water
; water availability
; United States
英文摘要: Climate change will result in increased precipitation variability with more extreme events reflected in more frequent droughts as well as more frequent extremely wet conditions. The increase in precipitation variability will occur at different temporal scales from intra to inter-annual and even longer scales. At the intra-annual scale, extreme precipitation events will be interspersed with prolonged periods in between events. At the inter-annual scale, dry years or multi-year droughts will be combined with wet years or multi-year wet conditions. Consequences of this aspect of climate change for the functioning ecosystems and their ability to provide ecosystem services have been underexplored. We used a process-based ecosystem model to simulate water losses and soil-water availability at 35 grassland locations in the central US under 4 levels of precipitation variability (control, +25, +50 + 75 %) and six temporal scales ranging from intra- to multi-annual variability. We show that the scale of temporal variability had a larger effect on soil-water availability than the magnitude of variability, and that inter- and multi-annual variability had much larger effects than intra-annual variability. Further, the effect of precipitation variability was modulated by mean annual precipitation. Arid-semiarid locations receiving less than about 380 mm yr−1 mean annual precipitation showed increases in water availability as a result of enhanced precipitation variability while more mesic locations (>380 mm yr−1) showed a decrease in soil water availability. The beneficial effects of enhanced variability in arid-semiarid regions resulted from a deepening of the soil-water availability profile and a reduction in bare soil evaporation. The deepening of the soil-water availability profile resulting from increase precipitation variability may promote future shifts in species composition and dominance to deeper-rooted woody plants for ecosystems that are susceptible to state changes. The break point, which has a mean of 380-mm with a range between 440 and 350 mm, is remarkably similar to the 370-mm threshold of the inverse texture hypothesis, below which coarse-texture soils had higher productivity than fine-textured soils. © 2015, Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/84585
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: School of Life Sciences, Arizona State University, Tempe, AZ, United States; School of Sustainability, Arizona State University, Tempe, AZ, United States; Jornada Basin Long Term Ecological Research Program, New Mexico State University, Las Cruces, NM, United States; USDA-ARS, Jornada Experimental Range, Las Cruces, NM, United States
Recommended Citation:
Sala O.E.,Gherardi L.A.,Peters D.P.C.. Enhanced precipitation variability effects on water losses and ecosystem functioning: differential response of arid and mesic regions[J]. Climatic Change,2015-01-01,131(2)