Effects of experimental warming on phenology, growth and gas exchange of treeline birch (Betula utilis) saplings, Eastern Tibetan Plateau, China

	Effects of experimental warming on phenology, growth and gas exchange of treeline birch (Betula utilis) saplings, Eastern Tibetan Plateau, China
	Xu, Zhenfeng ; Hu, Tingxing ; Zhang, Yuanbin
刊名	EUROPEAN JOURNAL OF FOREST RESEARCH
	2012
卷号	131 期号:3 页码:811-819
关键词	Open top chamber Leaf fluctuating asymmetry Treeline ecotone Photosynthesis Leaf morphology
ISSN号	1612-4669
通讯作者	Hu, TX (reprint author), Sichuan Agr Univ, Fac Forestry, Key Lab Forestry Ecol Engn Sichuan Prov, Xingkang Rd 46, Yaan 625014, Sichuan, Peoples R China.
产权排序	2
英文摘要	Mountain birch (Betula utilis) is the most important treeline species in alpine forests of southwestern China. In order to understand the effects of future warming on treeline birch, this study was conducted to examine the effects of experimental warming on leaf phenology, growth and gas exchange of B. utilis saplings using the open top chamber (OTC) method in a treeline ecotone of eastern Tibetan Plateau. The OTCs enhanced daily mean air temperature by 2.9 K throughout the growing season. Conversely, soil moisture within the OTCs on average declined by 3% over the experimental period. Experimental warming did not affect the timing of bud break, although treeline birch saplings growing in the OTCs manifested later leaf abscission, resulting in longer leaf life span. Artificial warming significantly accelerated the leaf and shoot growth rates of treeline birch saplings, resulting in larger leaf area and longer shoot elongation late in the growing season. Moreover, experimental warming significantly reduced the leaf fluctuating asymmetry (FA) and tended to increase specific leaf area (SLA). Moreover, elevated temperatures significantly enhanced the transpiration rate (E), stomatal conductance (g (s)), maximum net assimilation rate (A (max)), dark respiration rate (R (d)) and apparent quantum yield (AQY) but did not influence the light compensation point (LCP) and light saturation point (LSP) of treeline birch saplings. Taken together, our results indicated that short-term experimental warming markedly altered structural/functional leaf traits and enhanced photosynthetic capacity of treeline birch saplings; such positive responses in treeline birch would be favorable for the growth of this species under future warmer world.
学科主题	Forestry
收录类别	SCI
资助信息	National Natural Science Foundation of China [30800165, 31000213]; New Century Excellent Talents in University [NCET-07-0592]; National Key Technology R&D Program of China [2011BAC09b05]; Key Discipline Construction Project in Sichuan Province, China [SZD0419]
语种	英语
WOS记录号	WOS:000302418400025
公开日期	2013-07-03
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/23829]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Xu, Zhenfeng,Hu, Tingxing,Zhang, Yuanbin. Effects of experimental warming on phenology, growth and gas exchange of treeline birch (Betula utilis) saplings, Eastern Tibetan Plateau, China[J]. EUROPEAN JOURNAL OF FOREST RESEARCH,2012,131(3):811-819.
APA	Xu, Zhenfeng,Hu, Tingxing,&Zhang, Yuanbin.(2012).Effects of experimental warming on phenology, growth and gas exchange of treeline birch (Betula utilis) saplings, Eastern Tibetan Plateau, China.EUROPEAN JOURNAL OF FOREST RESEARCH,131(3),811-819.
MLA	Xu, Zhenfeng,et al."Effects of experimental warming on phenology, growth and gas exchange of treeline birch (Betula utilis) saplings, Eastern Tibetan Plateau, China".EUROPEAN JOURNAL OF FOREST RESEARCH 131.3(2012):811-819.