草业学报Issue(6)：320-326,7.DOI:10.11686/cyxb20140638
拉萨河谷山地灌丛草地物种多样性随海拔升高的变化特征
Variation in the biodiversity of montane shrub grassland communities along an altitudinal gradient in a Lhasa River basin valley
摘要
Abstract
A field survey was carried out to measure the variation in the biodiversity of montane shrub grassland communities along an altitudinal gradient in the Xincang village valley,Taktse County in the Lhasa River ba-sin.Community assembly and functional trait diversity were assessed using the Rao index.The aboveground biomass and total coverage of shrubs initially increased and then decreased with increasing altitude.Variation in aboveground biomass (49.18±19.17 g/m2 )or total coverage (71%±14%)for alpine meadows among plots a-long the altitudinal gradient was not high.Species composition indices varied along the altitudinal gradient;Kobresia pygmaea (0.591±0.034)and Carex moorcroftii (0.326±0.061)were the two most dominant spe-cies.Species diversity of the shrub-grassland community revealed a unimodal variation pattern along the altitu-dinal gradient;both species richness and the Shannon-Wiener diversity index initially increased and then de-creased from 3992 to 4940 m.Conversely,the Rao index for plant height decreased with increasing altitude. Being the most important factor in the ecological security of the Lhasa river basin,montane shrub grassland should be afforded more scientific attention,particularly the interactions between and the mechanisms underly-ing species richness,functional traits and ecological processes.关键词
西藏/海拔梯度/物种多样性/功能性状/山地灌丛草地Key words
Tibet/altitudinal gradient/species diversity/functional trait/montane shrub grassland分类
农业科技引用本文复制引用
罗黎鸣,苗彦军,武建双,潘影,土艳丽,余成群,赵延,赵贯锋,武俊喜..拉萨河谷山地灌丛草地物种多样性随海拔升高的变化特征[J].草业学报,2014,(6):320-326,7.基金项目
国家科技支撑计划项目（2011BAC09B03，2011BAD17B05），“西部之光”人才培养计划项目（20100309）和西藏生态专项（Z2012C07G03）资助。 （）
