IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2016  > Vol13 No.11
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
Corresponding AuthorLiu Xin-sheng
2016-11
Source PublicationJournal of Mountain Science
ISSN1672-6316
Volume13Issue:11Pages:2036-2045
Subtype期刊论文
AbstractUnder 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.
KeywordTreeline Ecotone Fine Root Biomass Above-ground Biomass Vegetation Type Southeast Tibet
DOI10.1007/s11629-016-4003-6
Indexed BySCI
Language英语
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/17618
CollectionJournal of Mountain Science_Journal of Mountain Science-2016_Vol13 No.11
Recommended Citation
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]. Journal of Mountain Science,2016,13(11):2036-2045.
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),2036-2045.
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):2036-2045.
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