气候变化领域集成服务门户(CCPortal): Critical minimum temperature limits xylogenesis and maintains treelines on the southeastern Tibetan Plateau

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DOI	10.1016/j.scib.2017.04.025
	Critical minimum temperature limits xylogenesis and maintains treelines on the southeastern Tibetan Plateau
	Li, Xiaoxia; Liang, Eryuan; Gricar, Jozica; Rossi, Sergio; Cufar, Katarina; Ellison, Aaron M.
通讯作者	Liang, E (通讯作者)
发表日期	2017
ISSN	2095-9273
EISSN	2095-9281
起始页码	804
结束页码	812
卷号	62 期号:11
英文摘要	Physiological and ecological mechanisms that define treelines are still debated. It has been suggested that the absence of trees above the treeline is caused by low temperatures that limit growth. Thus, we hypothesized that there is a critical minimum temperature (CTmin) preventing xylogenesis at treeline. We tested this hypothesis by examining weekly xylogenesis across three and four growing seasons in two natural Smith fir (Abies georgei var. smithii) treeline sites on the southeastern Tibetan Plateau. Despite differences in the timing of cell differentiation among years, minimum air temperature was the dominant climatic variable associated with xylem growth; the critical minimum temperature (CTmin) for the onset and end of xylogenesis occurred at 0.7 +/- 0.4 degrees C. A process-based modelling chronology of tree-ring formation using this CTmin was consistent with actual tree-ring data. This extremely low CTmin permits Smith fir growing at treeline to complete annual xylem production and maturation and provides both support and a mechanism for treeline formation. (C) 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
关键词	SPRUCE PICEA-ABIES GROWTH-LIMITATION CAMBIAL ACTIVITY NORWAY SPRUCE SCOTS PINE ALTITUDINAL GRADIENT CARBON STORAGE GROWING-SEASON BLACK SPRUCE TREE GROWTH
英文关键词	Cambial activity; Critical minimum temperature; Timberline; Xylem; Vaganov-Shashkin model
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000405584900014
来源期刊	SCIENCE BULLETIN
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/259077
推荐引用方式 GB/T 7714	Li, Xiaoxia,Liang, Eryuan,Gricar, Jozica,et al. Critical minimum temperature limits xylogenesis and maintains treelines on the southeastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2017,62(11).
APA	Li, Xiaoxia,Liang, Eryuan,Gricar, Jozica,Rossi, Sergio,Cufar, Katarina,&Ellison, Aaron M..(2017).Critical minimum temperature limits xylogenesis and maintains treelines on the southeastern Tibetan Plateau.SCIENCE BULLETIN,62(11).
MLA	Li, Xiaoxia,et al."Critical minimum temperature limits xylogenesis and maintains treelines on the southeastern Tibetan Plateau".SCIENCE BULLETIN 62.11(2017).