DOI: 10.1111/gcb.12643
论文题名: Climate change drives a shift in peatland ecosystem plant community: Implications for ecosystem function and stability
作者: Dieleman C.M. ; Branfireun B.A. ; Mclaughlin J.W. ; Lindo Z.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 1 起始页码: 388
结束页码: 395
语种: 英语
英文关键词: Carbon dioxide
; Carex
; Climate change
; Peatland
; Poor fen
; Sphagnum
; Temperature
; Water table
Scopus关键词: Carex
; Sphagnum
; Tracheophyta
; carbon dioxide
; ground water
; analysis of variance
; biodiversity
; biological model
; climate change
; ecosystem
; metabolism
; pH
; physiology
; species difference
; Sphagnopsida
; temperature
; Analysis of Variance
; Biodiversity
; Carbon Dioxide
; Climate Change
; Ecosystem
; Groundwater
; Hydrogen-Ion Concentration
; Models, Biological
; Species Specificity
; Sphagnopsida
; Temperature
英文摘要: The composition of a peatland plant community has considerable effect on a range of ecosystem functions. Peatland plant community structure is predicted to change under future climate change, making the quantification of the direction and magnitude of this change a research priority. We subjected intact, replicated vegetated poor fen peat monoliths to elevated temperatures, increased atmospheric carbon dioxide (CO2), and two water table levels in a factorial design to determine the individual and synergistic effects of climate change factors on the poor fen plant community composition. We identify three indicators of a regime shift occurring in our experimental poor fen system under climate change: nonlinear decline of Sphagnum at temperatures 8 °C above ambient conditions, concomitant increases in Carex spp. at temperatures 4 °C above ambient conditions suggesting a weakening of Sphagnum feedbacks on peat accumulation, and increased variance of the plant community composition and pore water pH through time. A temperature increase of +4 °C appeared to be a threshold for increased vascular plant abundance; however the magnitude of change was species dependent. Elevated temperature combined with elevated CO2 had a synergistic effect on large graminoid species abundance, with a 15 times increase as compared to control conditions. Community analyses suggested that the balance between dominant plant species was tipped from Sphagnum to a graminoid-dominated system by the combination of climate change factors. Our findings indicate that changes in peatland plant community composition are likely under future climate change conditions, with a demonstrated shift toward a dominance of graminoid species in poor fens. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61770
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, The University of Western Ontario, London, ON, Canada; Ontario Forest Research Institute, 1235 Queen St. E., Sault Ste. Marie, ON, Canada
Recommended Citation:
Dieleman C.M.,Branfireun B.A.,Mclaughlin J.W.,et al. Climate change drives a shift in peatland ecosystem plant community: Implications for ecosystem function and stability[J]. Global Change Biology,2015-01-01,21(1)