globalchange  > 气候变化与战略
DOI: 10.1002/ece3.5968
论文题名:
Contrasting responses to climate change at Himalayan treelines revealed by population demographics of two dominant species
作者: Mainali K.; Shrestha B.B.; Sharma R.K.; Adhikari A.; Gurarie E.; Singer M.; Parmesan C.
刊名: Ecology and Evolution
ISSN: 20457758
出版年: 2020
卷: 10, 期:3
语种: 英语
英文关键词: Abies spectabilis ; climate change ; global warming ; Nepal Himalaya ; Rhododendron campanulatum ; treeline shift
英文摘要: Alpine treelines are expected to shift upward due to recent climate change. However, interpretation of changes in montane systems has been problematic because effects of climate change are frequently confounded with those of land use changes. The eastern Himalaya, particularly Langtang National Park, Central Nepal, has been relatively undisturbed for centuries and thus presents an opportunity for studying climate change impacts on alpine treeline uncontaminated by potential confounding factors. We studied two dominant species, Abies spectabilis (AS) and Rhododendron campanulatum (RC), above and below the treeline on two mountains. We constructed 13 transects, each spanning up to 400 m in elevation, in which we recorded height and state (dead or alive) of all trees, as well as slope, aspect, canopy density, and measures of anthropogenic and animal disturbance. All size classes of RC plants had lower mortality above treeline than below it, and young RC plants (<2 m tall) were at higher density above treeline than below. AS shows little evidence of a position change from the historic treeline, with a sudden extreme drop in density above treeline compared to below. Recruitment, as measured by size–class distribution, was greater above treeline than below for both species but AS is confined to ~25 m above treeline whereas RC is luxuriantly growing up to 200 m above treeline. Synthesis. Evidence suggests that the elevational limits of RC have shifted upward both because (a) young plants above treeline benefited from facilitation of recruitment by surrounding vegetation, allowing upward expansion of recruitment, and (b) temperature amelioration to mature plants increased adult survival. We predict that the current pure stand of RC growing above treeline will be colonized by AS that will, in turn, outshade and eventually relegate RC to be a minor component of the community, as is the current situation below the treeline. © 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159511
Appears in Collections:气候变化与战略

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作者单位: Department of Integrative Biology, The University of Texas at Austin, Austin, TX, United States; Department of Biology, University of Maryland, College Park, MD, United States; Central Department of Botany, Tribhuvan University, Kirtipur, Kathmandu, Nepal; Department of Biology, Nobel Academy Higher Secondary School and College, Kathmandu, Nepal; Department of Natural Resource Ecology and Management, Oklahoma State University, Stillwater, OK, United States; School of Biological Sciences, Plymouth University, Plymouth, United Kingdom; Theoretical and Experimental Ecology (SETE), UMR 5321, CNRS, University Paul-Sabatier, Moulis, France; Department of Geological Sciences, The University of Texas at Austin, Austin, TX, United States

Recommended Citation:
Mainali K.,Shrestha B.B.,Sharma R.K.,et al. Contrasting responses to climate change at Himalayan treelines revealed by population demographics of two dominant species[J]. Ecology and Evolution,2020-01-01,10(3)
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