Short-term responses of Picea asperata seedlings of different ages grown in two contrasting forest ecosystems to experimental warming

doi:10.1016/j.envexpbot.2011.10.011

	Short-term responses of Picea asperata seedlings of different ages grown in two contrasting forest ecosystems to experimental warming
	Xu, Zhenfeng 1,2; Yin, Huajun 1; Xiong, Pei 1; Wan, Chuan 1; Liu, Qing 1
刊名	ENVIRONMENTAL AND EXPERIMENTAL BOTANY
	2012-04
卷号	77 页码:1-11
关键词	Open top chamber Soil N turnover Coniferous forest Phenology Growth Photosynthesis
ISSN号	0098-8472
DOI	10.1016/j.envexpbot.2011.10.011
产权排序	2
文献子类	Article
英文摘要	Low temperatures are generally limiting factors in alpine ecosystems. Predicted global warming therefore could have profound impacts on these ecosystems in the future. This study was conducted to compare effects of experimental warming on the phenology, growth and photosynthesis of dragon spruce seedlings of two age classes (2- and 8-year-old seedlings) grown in two contrasting subalpine forest ecosystems (dragon spruce plantation versus spruce-fir dominated natural forest) using the open top chamber (OTC) method in the Eastern Tibetan Plateau of China. The OTCs enhanced daily mean air (30 cm above the soil surface) and soil temperatures (5 cm below the soil surface) by 1.2 degrees C and by 0.6 degrees C in two experimental sites, respectively, throughout the growing season. Conversely, soil volumetric moisture declined by 3.8% and 2.8% in the plantation and natural forest. Experimental warming markedly extended the growing season of two age classes in both sites. However, there were no clear differences in phenology between ages or sites. Warming often increased the growth and photosynthesis of dragon spruce seedlings. There were pronounced differences in the morphological and physiological performances between ages or sites. Nevertheless, there were no significant interactions of warming, age and site on phenology, growth and photosynthesis. Irrespective of seedling ages or experimental sites, artificial warming had significant increases in component biomass except the root. The size of warming effect on biomass depended strongly on seedling age and experimental site. Elevated temperatures remarkably increased net N mineralization rates and extractable inorganic N pools in both sites. Both net N mineralization and extractable inorganic N pool were pronouncedly greater in the natural forest than in the plantation. Taken together, our results indicate that warming generally has positive effects on the phenology, growth and photosynthesis for both seedling age classes in any site. Younger seedlings are more sensitive to warming as compared with the older seedlings. Reforestation dramatically affects the responses of soil N turnover and availability to warming. We conclude that both direct and indirect warming effects synchronously modify the seedling responses. (C) 2011 Elsevier B.V. All rights reserved.
学科主题	Plant Sciences
URL标识	查看原文
WOS关键词	PLANT-GROWTH ; NITROGEN MINERALIZATION ; MEDITERRANEAN SHRUBLAND ; INCREASED TEMPERATURE ; TALLGRASS PRAIRIE ; SOIL RESPIRATION ; WESTERN SICHUAN ; CO2 ENRICHMENT ; CARBON-DIOXIDE ; ALPINE SHRUBS
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000301025800001
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/29924]
专题	成都生物研究所_生态研究
通讯作者	Liu, Qing
作者单位	1.Sichuan Agr Univ, Inst Ecol Forestry, Chengdu 611830, Peoples R China; 2.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Xu, Zhenfeng,Yin, Huajun,Xiong, Pei,et al. Short-term responses of Picea asperata seedlings of different ages grown in two contrasting forest ecosystems to experimental warming[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2012,77:1-11.
APA	Xu, Zhenfeng,Yin, Huajun,Xiong, Pei,Wan, Chuan,&Liu, Qing.(2012).Short-term responses of Picea asperata seedlings of different ages grown in two contrasting forest ecosystems to experimental warming.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,77,1-11.
MLA	Xu, Zhenfeng,et al."Short-term responses of Picea asperata seedlings of different ages grown in two contrasting forest ecosystems to experimental warming".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 77(2012):1-11.