气候变化领域集成服务门户(CCPortal): Facilitation stabilizes moisture-controlled alpine juniper shrublines in the central Tibetan Plateau

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DOI	10.1016/j.gloplacha.2015.06.007
	Facilitation stabilizes moisture-controlled alpine juniper shrublines in the central Tibetan Plateau
	Wang, Yafeng; Liang, Eryuan; Ellison, Aaron M.; Lu, Xiaoming; Camarero, J. Julio
通讯作者	Liang, EY (通讯作者)
发表日期	2015
ISSN	0921-8181
EISSN	1872-6364
起始页码	20
结束页码	30
卷号	132
英文摘要	The Tibetan Plateau hosts one of the world's highest undisturbed alpine juniper shrublines. However, little is known about the dynamics of these shrublines in response to climate warming and shrub-to-shrub interactions. Since growth of shrubline junipers is limited more by moisture availability than by low temperatures, we tested if upslope advancement of alpine juniper shrublines was constrained by warmer temperatures and related recent droughts. We also evaluated whether facilitation among neighboring shrubs, as inferred from spatial analyses, influenced shrubline dynamics. Three rectangular plots crossing the Juniperus pingii var. wilsonii shrubline were sampled at elevations from 4810 to 4917 m a.s.l. near the Nam Co Lake, central Tibetan Plateau. Location of each stem and its diameter at the root collar and age were measured. We reconstructed the spatial and temporal shrubline dynamics during the past 350 years using standard dendrochronological methods. Independent, long-term summer temperature reconstructions also were associated with shrub recruitment. Point-pattern analyses were used to characterize spatial patterns of different size classes of shrubs. The three shrublines showed little long-term changes despite ongoing warming; no upward shift has occurred in the past 100 years. Recruitment was negatively associated with summer temperatures and drought occurrence since the 1920s. Spatial patterns were characterized by clustering at local scales and attraction between the different size classes, suggesting facilitation. We conclude that moisture availability limits the recruitment and elevational advance of junipers in this area of the Tibetan Plateau. Dynamics of alpine shrublines are more contingent on positive interactions and local environmental factors than on regional climatic variability. (C) 2015 Elsevier B.V. All rights reserved.
关键词	TREE-LINE CLIMATIC VARIABILITY DYNAMICS FOREST RINGS EXPANSION RESPONSES ECOTONES PATTERN TUNDRA
英文关键词	Dendroecology; Alpine shrubline; Climatic warming; Conspecific facilitation; Drought; Tibetan Plateau
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000358805900003
来源期刊	GLOBAL AND PLANETARY CHANGE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258559
推荐引用方式 GB/T 7714	Wang, Yafeng,Liang, Eryuan,Ellison, Aaron M.,et al. Facilitation stabilizes moisture-controlled alpine juniper shrublines in the central Tibetan Plateau[J]. 中国科学院青藏高原研究所,2015,132.
APA	Wang, Yafeng,Liang, Eryuan,Ellison, Aaron M.,Lu, Xiaoming,&Camarero, J. Julio.(2015).Facilitation stabilizes moisture-controlled alpine juniper shrublines in the central Tibetan Plateau.GLOBAL AND PLANETARY CHANGE,132.
MLA	Wang, Yafeng,et al."Facilitation stabilizes moisture-controlled alpine juniper shrublines in the central Tibetan Plateau".GLOBAL AND PLANETARY CHANGE 132(2015).