DOI: 10.1111/gcb.14018
Scopus记录号: 2-s2.0-85040085810
论文题名: Climate-driven diversity change in annual grasslands: Drought plus deluge does not equal normal
作者: Harrison S.P. ; LaForgia M.L. ; Latimer A.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 4 起始页码: 1782
结束页码: 1792
语种: 英语
英文关键词: drought
; extreme climate event
; precipitation
; species richness
; specific leaf area
Scopus关键词: biodiversity
; climate effect
; community response
; drought
; extreme event
; grassland
; leaf area
; plant
; precipitation (climatology)
; species richness
英文摘要: Climate forecasts agree that increased variability and extremes will tend to reduce the availability of water in many terrestrial ecosystems. Increasingly severe droughts may be exacerbated both by warmer temperatures and by the relative unavailability of water that arrives in more sporadic and intense rainfall events. Using long-term data and an experimental water manipulation, we examined the resilience of a heterogeneous annual grassland community to a prolonged series of dry winters that led to a decline in plant species richness (2000–2014), followed by a near-record wet winter (2016–2017), a climatic sequence that broadly resembles the predicted future in its high variability. In our 80, 5-m2observational plots, species richness did not recover in response to the wet winter, and the positive relationship of richness to annual winter rainfall thus showed a significant weakening trend over the 18-year time period. In experiments on 100, 1-m2plots, wintertime water supplementation increased and drought shelters decreased the seedling survival and final individual biomass of native annual forbs, the main functional group contributing to the observed long-term decline in richness. Water supplementation also increased the total cover of native annual forbs, but only increased richness within nested subplots to which seeds were also added. We conclude that prolonged dry winters, by increasing seedling mortality and reducing growth of native forbs, may have diminished the seedbank and thus the recovery potential of diversity in this community. However, the wet winter and the watering treatment did cause recovery of the community mean values of a key functional trait (specific leaf area, an indicator of drought intolerance), suggesting that some aggregate community properties may be stabilized by functional redundancy among species. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110456
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Environmental Science and Policy, University of California, Davis, CA, United States; Department of Plant Sciences, University of California, Davis, CA, United States
Recommended Citation:
Harrison S.P.,LaForgia M.L.,Latimer A.M.. Climate-driven diversity change in annual grasslands: Drought plus deluge does not equal normal[J]. Global Change Biology,2018-01-01,24(4)