气候变化领域集成服务门户(CCPortal): 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

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DOI	10.1007/s11284-010-0779-y
	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; Li, Mingcai; Luo, Ji
通讯作者	Luo, TX (通讯作者)
发表日期	2011
ISSN	0912-3814
EISSN	1440-1703
起始页码	253
结束页码	263
卷号	26 期号:2
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.
关键词	WATER-USE EFFICIENCY NET PRIMARY PRODUCTIVITY ISOTOPE DISCRIMINATION STOMATAL CONDUCTANCE ORGANIC-MATTER GAS-EXCHANGE TREE-RINGS AREA INDEX GROWTH CO2
英文关键词	delta C-13; Leaf area index; Leaf nitrogen; Litterfall; Net primary productivity; Seasonality; Specific leaf area
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000288552900003
来源期刊	ECOLOGICAL RESEARCH
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/257857
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]. 中国科学院青藏高原研究所,2011,26(2).
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).
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).