DOI: 10.1111/gcb.14046
Scopus记录号: 2-s2.0-85041635826
论文题名: High land-use intensity exacerbates shifts in grassland vegetation composition after severe experimental drought
作者: Stampfli A. ; Bloor J.M.G. ; Fischer M. ; Zeiter M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 5 起始页码: 2021
结束页码: 2034
语种: 英语
英文关键词: climate change
; ecosystem resilience
; legacy effects
; multisite experiment
; nitrogen availability
; plant traits
; precipitation manipulation
; seedling recruitment
; seminatural grassland
; “Birch effect”
Scopus关键词: Poaceae
英文摘要: Climate change projections anticipate increased frequency and intensity of drought stress, but grassland responses to severe droughts and their potential to recover are poorly understood. In many grasslands, high land-use intensity has enhanced productivity and promoted resource-acquisitive species at the expense of resource-conservative ones. Such changes in plant functional composition could affect the resistance to drought and the recovery after drought of grassland ecosystems with consequences for feed productivity resilience and environmental stewardship. In a 12-site precipitation exclusion experiment in upland grassland ecosystems across Switzerland, we imposed severe edaphic drought in plots under rainout shelters and compared them with plots under ambient conditions. We used soil water potentials to scale drought stress across sites. Impacts of precipitation exclusion and drought legacy effects were examined along a gradient of land-use intensity to determine how grasslands resisted to, and recovered after drought. In the year of precipitation exclusion, aboveground net primary productivity (ANPP) in plots under rainout shelters was −15% to −56% lower than in control plots. Drought effects on ANPP increased with drought severity, specified as duration of topsoil water potential ψ < −100 kPa, irrespective of land-use intensity. In the year after drought, ANPP had completely recovered, but total species diversity had declined by −10%. Perennial species showed elevated mortality, but species richness of annuals showed a small increase due to enhanced recruitment. In general, the more resource-acquisitive grasses increased at the expense of the deeper-rooted forbs after drought, suggesting that community reorganization was driven by competition rather than plant mortality. The negative effects of precipitation exclusion on forbs increased with land-use intensity. Our study suggests a synergistic impact of land-use intensification and climate change on grassland vegetation composition, and implies that biomass recovery after drought may occur at the expense of biodiversity maintenance. © 2018 The Authors. Global Change Biology Published by John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110438
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: School of Agricultural, Forest and Food Sciences, Bern University of Applied Sciences, Zollikofen, Switzerland; Institute of Plant Sciences, University of Bern, Bern, Switzerland; Oeschger Center for Climate Change Research, University of Bern, Bern, Switzerland; VetAgro-Sup, UREP, INRA, Clermont-Ferrand, France
Recommended Citation:
Stampfli A.,Bloor J.M.G.,Fischer M.,et al. High land-use intensity exacerbates shifts in grassland vegetation composition after severe experimental drought[J]. Global Change Biology,2018-01-01,24(5)