气候变化领域集成服务门户(CCPortal): Contrasting changes in above- and below-ground biomass allocation across treeline ecotones in southeast Tibet

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DOI	10.1007/s11629-016-4003-6
	Contrasting changes in above- and below-ground biomass allocation across treeline ecotones in southeast Tibet
	Liu Xin-sheng; Nie Yu-qin; Kong Gao-qiang; Luo Tian-xiang
通讯作者	Liu, XS (通讯作者)
发表日期	2016
ISSN	1672-6316
EISSN	1993-0321
起始页码	2036
结束页码	2045
卷号	13 期号:11
英文摘要	Under conditions of a warmer climate, the advance of the alpine treeline into alpine tundra has implications for carbon dynamics in mountain ecosystems. However, the above- and below-ground live biomass allocations among different vegetation types within the treeline ecotones are not well investigated. To determine the altitudinal patterns of above-/below-ground carbon allocation, we measured the root biomass and estimated the above-ground biomass (AGB) in a subalpine forest, treeline forest, alpine shrub, and alpine grassland along two elevational transects towards the alpine tundra in southeast Tibet. The AGB strongly declined with increasing elevation, which was associated with a decrease in the leaf area index and a consequent reduction in carbon gain. The fine root biomass (FRB) increased significantly more in the alpine shrub and grassland than in the treeline forest, whereas the coarse root biomass changed little with increasing altitudes, which led to a stable below-ground biomass (BGB) value across altitudes. Warm and infertile soil conditions might explain the large amount of FRB in alpine shrub and grassland. Consequently, the root to shoot biomass ratio increased sharply with altitude, which suggested a remarkable shift of biomass allocation to root systems near the alpine tundra. Our findings demonstrate contrasting changes in AGB and BGB allocations across treeline ecotones, which should be considered when estimating carbon dynamics with shifting treelines.
关键词	NET PRIMARY PRODUCTIVITY FINE-ROOT BIOMASS SOIL-TEMPERATURE ALPINE TREELINE SERGYEMLA MOUNTAINS VEGETATION TYPES CLIMATE-CHANGE ELEVATION FORESTS GRADIENTS
英文关键词	Treeline ecotone; Fine root biomass; Above-ground biomass; Vegetation type; Southeast Tibet
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000387032600012
来源期刊	JOURNAL OF MOUNTAIN SCIENCE
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/258650
推荐引用方式 GB/T 7714	Liu Xin-sheng,Nie Yu-qin,Kong Gao-qiang,et al. Contrasting changes in above- and below-ground biomass allocation across treeline ecotones in southeast Tibet[J]. 中国科学院青藏高原研究所,2016,13(11).
APA	Liu Xin-sheng,Nie Yu-qin,Kong Gao-qiang,&Luo Tian-xiang.(2016).Contrasting changes in above- and below-ground biomass allocation across treeline ecotones in southeast Tibet.JOURNAL OF MOUNTAIN SCIENCE,13(11).
MLA	Liu Xin-sheng,et al."Contrasting changes in above- and below-ground biomass allocation across treeline ecotones in southeast Tibet".JOURNAL OF MOUNTAIN SCIENCE 13.11(2016).