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内蒙古自治区呼和浩特市赛罕区大学西街235号 邮编: 010021
作者机构:Lhasa National Ecological Research StationKey Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of SciencesBeijing 100049China
出 版 物:《Science China(Life Sciences)》 (中国科学(生命科学英文版))
年 卷 期:2010年第53卷第9期
页 面:1142-1151页
核心收录:
基 金:supported by the National Science & Technology Pillar Program (Grant Nos. 2007BAD80B03 and 2007BAC06B01) a West Light Joint Scholar-ship from the Chinese Academy of Sciences in 2008 the National Natural Science Foundation of China (Grant Nos. 40771074 and 30700080)
主 题:Qinghai-Tibetan Plateau climate stress biomass allocation shoot/root ratio plant traits fine roots
摘 要:Plant traits and individual plant biomass allocation of 57 perennial herbaceous species,belonging to three common functional groups (forbs,grasses and sedges) at subalpine (3700 m ASL),alpine (4300 m ASL) and subnival (≥5000 m ASL) sites were examined to test the hypothesis that at high altitudes,plants reduce the proportion of aboveground parts and allocate more biomass to belowground parts,especially storage organs,as altitude increases,so as to geminate and resist environmental ***,results indicate that some divergence in biomass allocation exists among *** increasing altitude,the mean fractions of total biomass allocated to aboveground parts *** mean fractions of total biomass allocation to storage organs at the subalpine site (7%±2% S.E.) were distinct from those at the alpine (23%±6%) and subnival (21%±6%) sites,while the proportions of green leaves at all altitudes remained almost *** 4300 m and 5000 m,the mean fractions of flower stems decreased by 45% and 41%,respectively,while fine roots increased by 86% and 102%,*** leaf areas and leaf areas of forbs and grasses deceased with rising elevation,while sedges showed opposite *** all three functional groups,leaf area ratio and leaf area root mass ratio decreased,while fine root biomass increased at higher *** allocation patterns of alpine plants were characterized by a reduction in aboveground reproductive organs and enlargement of fine roots,while the proportion of leaves remained *** was beneficial for high altitude plants to compensate carbon gain and nutrient uptake under low temperature and limited nutrients by stabilizing biomass investment to photosynthetic structures and increasing the absorption surface area of fine *** contrast to forbs and grasses that had high mycorrhizal infection,sedges had higher single leaf area and more root fraction,especially fine roots.