Contrasting changes in above- and below-ground biomass allocation across treeline ecotones in southeast Tibet

作     者：Liu Xin-sheng Nie Yu-qin Kong Gao-qiang Luo Tian-xiang Liu Xin-sheng Nie Yu-qin Kong Gao-qiang Luo Tian-xiang

作者机构：College of Tourism and Territorial ResourcesJiujiang University Key Laboratory of Alpine Ecology and BiodiversityInstitute of Tibetan Plateau ResearchChinese Academy of Sciences School of AccountancyJiujiang University 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2016年第13卷第11期

页      面：2036-2045页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 09[农学] 0303[法学-社会学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0705[理学-地理学] 0815[工学-水利工程] 0903[农学-农业资源与环境] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0704[理学-天文学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：supported by the National Natural Science Foundation of China (41561011) the Natural Science Foundation of Jiangxi Province, China (20151BAB213029) 

主　　题：Treeline 交错群落 好根生物资源 未葬生物资源 植被类型 东南西藏 

摘      要：Under conditions of a warmer climate,the advance of the alpine treeline into alpine tundra has implications for carbon dynamics in mountain ***,the above- and below-ground live biomass allocations among different vegetation types within the treeline ecotones are not well *** 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 *** AGB strongly declined with increasing elevation,which was associated with a decrease in the leaf area index and a consequent reduction in carbon *** 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 *** and infertile soil conditions might explain the large amount of FRB in alpine shrub and ***,the root toshoot biomass ratio increased sharply with altitude,which suggested a remarkable shift of biomass allocation to root systems near the alpine *** findings demonstrate contrasting changes in AGB and BGB allocations across treeline ecotones,which should be considered when estimating carbon dynamics with shifting treelines.