气候变化领域集成服务门户(CCPortal): Increased stem density and competition may diminish the positive effects of warming at alpine treeline

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DOI	10.1890/15-1264.1
	Increased stem density and competition may diminish the positive effects of warming at alpine treeline
	Wang, Yafeng; Pederson, Neil; Ellison, Aaron M.; Buckley, Hannah L.; Case, Bradley S.; Iang, Eryuan L.; Camarero, J. Julio
通讯作者	Ellison, AM (通讯作者)
发表日期	2016
ISSN	0012-9658
EISSN	1939-9170
起始页码	1668
结束页码	1679
卷号	97 期号:7
英文摘要	The most widespread response to global warming among alpine treeline ecotones is not an upward shift, but an increase in tree density. However, the impact of increasing density on interactions among trees at treeline is not well understood. Here, we test if treeline densification induced by climatic warming leads to increasing intraspecific competition. We mapped and measured the size and age of Smith fir trees growing in two treelines located in the southeastern Tibetan Plateau. We used spatial point-pattern and codispersion analyses to describe the spatial association and covariation among seedlings, juveniles, and adults grouped in 30-yr age classes from the 1860s to the present. Effects of competition on tree height and regeneration were inferred from bivariate mark-correlations. Since the 1950s, a rapid densification occurred at both sites in response to climatic warming. Competition between adults and juveniles or seedlings at small scales intensified as density increased. Encroachment negatively affected height growth and further reduced recruitment around mature trees. We infer that tree recruitment at the studied treelines was more cold-limited prior to 1950 and shifted to a less temperature-constrained regime in response to climatic warming. Therefore, the ongoing densification and encroachment of alpine treelines could alter the way climate drives their transitions toward subalpine forests.
关键词	CLIMATE-CHANGE SEEDLING RECRUITMENT SPATIAL-PATTERNS TIBETAN PLATEAU TEMPERATURE MOUNTAINS DYNAMICS FACILITATION SURVIVAL ESTABLISHMENT
英文关键词	climatic warming; codispersion; dendroecology; facilitation; long-term ecological process; paleoecology; plant interactions; point-pattern analysis; timberline
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000379323800005
来源期刊	ECOLOGY
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/258814
推荐引用方式 GB/T 7714	Wang, Yafeng,Pederson, Neil,Ellison, Aaron M.,et al. Increased stem density and competition may diminish the positive effects of warming at alpine treeline[J]. 中国科学院青藏高原研究所,2016,97(7).
APA	Wang, Yafeng.,Pederson, Neil.,Ellison, Aaron M..,Buckley, Hannah L..,Case, Bradley S..,...&Camarero, J. Julio.(2016).Increased stem density and competition may diminish the positive effects of warming at alpine treeline.ECOLOGY,97(7).
MLA	Wang, Yafeng,et al."Increased stem density and competition may diminish the positive effects of warming at alpine treeline".ECOLOGY 97.7(2016).