草业学报2016，Vol.25Issue(3)：22-31,10.DOI:10.11686/cyxb2015199
拉萨河谷山地灌丛草地植物多样性监测方法的比较研究
A comparative study of methods for monitoring plant diversity in montane shrub grassland in the Lhasa River Basin
摘要
Abstract
Biodiversity is an important consideration in the monitoring and assessment of the ecological stability of rangelands in Tibet.Climate warming and grazing disturbance both threaten the stability of the Tibetan rangelands;hence,research into species succession,transition patterns and species diversity is important for the protection and utilization of grasslands in the region.A field survey was carried out to measure the commu-nity species composition and the species change along an altitudinal gradient in the Bailang village valley,Linz-hou County in the Lhasa River Basin.Three conventional sampling methods,random square quadrats,repeat sampling lines and the Modified- Whittaker plots,were compared in this study.Key results were:(1 )All three sampling methods indicated thatα-diversity initially increased and then decreased with increasing altitude, though the line transect method using three 50 m transects detected more species than the other two methods. (2)The Sorensen similarity index and the Bray-Curtis index ofβ-diversity decreased with increasing altitude. (3)The intercept c and slope z of the relationship between species and sampling area showed unimodal patterns with increasing altitude as also did species richness.(4)In order to cover 80% of local plant species,the mini-mum sampling area should be up to 100 m2 .Future research should focus on the factors determining biodiversi-ty distribution and community assembly in response to climate change and grazing disturbance.关键词
西藏/海拔梯度/物种多样性/监测方法/山地灌丛草地Key words
Tibet/altitudinal gradient/species diversity/monitoring methods/montane shrub grassland引用本文复制引用
罗黎鸣,武建双,余成群,潘影,苗彦军,武俊喜,明升平,郭应杰..拉萨河谷山地灌丛草地植物多样性监测方法的比较研究[J].草业学报,2016,25(3):22-31,10.基金项目
国家自然青年基金项目（41401070），国家科技支撑计划项目（2011BAC09B03，2011BAD17B05）和“西部之光”人才培养计划项目（20100309）资助。 （）
