Seasonal variations in leaf delta C-13 and nitrogen associated with foliage turnover and carbon gain for a wet subalpine fir forest in the Gongga Mountains, eastern Tibetan Plateau

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Seasonal variations in leaf delta C-13 and nitrogen associated with foliage turnover and carbon gain for a wet subalpine fir forest in the Gongga Mountains, eastern Tibetan Plateau
	Luo, Tianxiang 1; Li, Mingcai 1; Luo, Ji2
刊名	ECOLOGICAL RESEARCH
	2011-03-01
卷号	26 期号:2 页码:253-263
关键词	delta C-13 Leaf area index Leaf nitrogen Litterfall Net primary productivity Seasonality Specific leaf area
ISSN号	0912-3814
通讯作者	Luo, TX
英文摘要	It is still unclear to what extent variations in foliar delta C-13 and nitrogen can be used to detect seasonal changes in canopy productivity. We hypothesize that in a wet and cloudy fir forest, seasonally higher litterfall and lower leaf area index (LAI) are correlated with higher mass-based leaf nitrogen (N (mass)) and net primary productivity (NPP), while foliar delta C-13 may change with specific leaf area (SLA), area-based leaf nitrogen (N (area)), and/or starch concentration. In order to test our hypotheses, stand-level litterfall and the means of delta C-13, N (mass), N (area), SLA, and starch concentration of canopy needles for a wet and cloudy Abies fabri forest in the Gongga Mountains were monthly measured during the growing season. Seasonal estimates of LAI were obtained from our previous work. A conceptual model was used to predict seasonal NPP of the fir forest. Seasonal mean delta C-13 and N (mass) and climatic variables were used as inputs. The delta C-13 across 1-7-year-old needles increased from May to September associated with decreasing SLA and increasing N (area). There were no significant differences in seasonal starch concentration. With increasing litterfall and decreasing LAI, seasonal mean N (mass) increased, while the delta C-13 varied little. The simulated NPP increased with increasing litterfall and related traits of N (mass) and N (area). Our data generally supported the hypotheses. The results also suggest that in the forest with relatively moist and cloudy environment, the largest fraction of annual carbon gain may occur in the early part of the growing season when higher litterfall results in higher N (mass) of canopy leaves.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Ecology
研究领域[WOS]	Environmental Sciences & Ecology
关键词[WOS]	WATER-USE EFFICIENCY ; NET PRIMARY PRODUCTIVITY ; FAGUS-SYLVATICA L. ; ISOTOPE DISCRIMINATION ; STOMATAL CONDUCTANCE ; ORGANIC-MATTER ; GAS-EXCHANGE ; TREE-RINGS ; AREA INDEX ; ECOSYSTEM
收录类别	SCI
语种	英语
WOS记录号	WOS:000288552900003
公开日期	2013-06-25
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/5515]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, TEL Lab, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Luo, Tianxiang,Li, Mingcai,Luo, Ji. Seasonal variations in leaf delta C-13 and nitrogen associated with foliage turnover and carbon gain for a wet subalpine fir forest in the Gongga Mountains, eastern Tibetan Plateau[J]. ECOLOGICAL RESEARCH,2011,26(2):253-263.
APA	Luo, Tianxiang,Li, Mingcai,&Luo, Ji.(2011).Seasonal variations in leaf delta C-13 and nitrogen associated with foliage turnover and carbon gain for a wet subalpine fir forest in the Gongga Mountains, eastern Tibetan Plateau.ECOLOGICAL RESEARCH,26(2),253-263.
MLA	Luo, Tianxiang,et al."Seasonal variations in leaf delta C-13 and nitrogen associated with foliage turnover and carbon gain for a wet subalpine fir forest in the Gongga Mountains, eastern Tibetan Plateau".ECOLOGICAL RESEARCH 26.2(2011):253-263.