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	The altitudinal distribution center of a widespread cushion species is related to an optimum combination of temperature and precipitation in the central Tibetan Plateau
	Li R.
	2013
关键词	Alpine meadow Climate Cushion plant Distribution pattern Limiting factor Plant cover Survival androsace-tapete primulaceae spatial genetic-structure net primary productivity central chile high andes ecosystem engineers alpine gradients plant elevation responses
英文摘要	Climate warming may threaten the survival of alpine cushion plants, which may have great implications for the stability of alpine ecosystems. However, little research has investigated the climatic causes of the altitudinal distribution of cushion plants. We hypothesize that for a widespread cushion species in semi-arid regions, there is a unimodal pattern of plant cover associated with an optimum combination of temperature and precipitation. We conducted a livestock exclosure experiment across the upper (5300 m) and lower (4430 m) limits of a widespread cushion species (Androsace tapete) along the south-facing slope of the Nyaiqentanglha Mountains during the period 2006-2010. The plant cover and survival across the fenced and unfenced quadrats were observed near weather stations at eight altitudes. There was a unimodal pattern in the coverage of A. tapete along the experimental gradient, which was confirmed by additional data from other species and mountains in this region. The coverage showed quadratic relationships with mean temperatures and the ratio of growing-season precipitation to the >= 5 degrees C accumulated temperature sum. Five-year monitoring data under fenced conditions demonstrated that the annual survival of A. tapete decreased away from the optimum distribution center. The results supported the hypothesis, suggesting a shift in the limiting factors of plant distribution between low and high altitudes. (c) 2012 Elsevier Ltd. All rights reserved.
出处	Journal of Arid Environments
卷	88
页	70-77
收录类别	SCI
语种	英语
ISSN号	0140-1963
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30440]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Li R.. The altitudinal distribution center of a widespread cushion species is related to an optimum combination of temperature and precipitation in the central Tibetan Plateau. 2013.

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