米拉山植物群落数量及海拔梯度与物种丰富度变化格局分析  

Numerical analysis on plant community and species richness patterns along an altitudinal gradient in the Mila Hill, Tibet

作　　者：拉多[1] 张燕杰[1] 庞有智[2] 崔玲玲[1] 刘杰[1] 索南措[1] 

机构地区：[1]西藏大学理学院,西藏拉萨850000 [2]内江师范学院地理与资源科学学院,四川内江641100

出　　处：《西藏大学学报（社会科学版）》2015年第2期12-20,共9页Journal of Tibet University

基　　金：2014年度国家自然科学基金地区科学基金项目"西藏拉萨河谷全新世植被与环境变化及泥炭孢粉和植物残体记录研究"(项目号:41362001);2012年度西藏自治区自然科学基金项目"拉萨河谷沼泽湿地资源及其保护对策研究"(项目号:Z2012A11G11/00)阶段性成果

摘　　要：文章以西藏林芝地区工布江达县境内的米拉山作为研究地点,采用双向指示种分析(TWINS-PAN)法、除趋势对应分析(DCA)法对米拉山东西坡10个海拔带的45个植物样方进行分析,同时对米拉山东坡与西坡的群落结构特征和转换后的物种丰富度(TSR)沿海拔梯度的变化格局进行了比较。TWIN-SPAN分类结果显示:米拉山东坡植被可分为6个群丛,与DCA排序结果不甚对应,西坡植物被分为8个群丛,与DCA排序结果基本一致。东西坡植物群落的垂直分布差异很大,东坡植被自然带较高,西坡植被自然带较低且植被类型复杂;东西坡TSR的海拔梯度格局也有很大差异,东坡高海拔带TSR最高,呈现出随海拔升高TSR升高的趋势,西坡高海拔带TSR最低,呈现出随海拔升高TSR降低的趋势。The eastern and western slopes of Mila Hill as the study site, the plant community structure and the re- lationship between TSR （Transformed Species Richness） and altitude were studied, with 10 altitude bands and 45 sample plots, by using TWINSPAN （Two way indicator species analysis）, DCA （Detrended correspondence analysis）. TWINSPAN classification showed that 6 plant associations can be recognized in the eastern slope of Mila Hill and was not consistent with DCA ordination result well, and 8 plant associations can be recognized in the western slope of Mila Hill and was consistent with DCA ordination result. DCA ordination axis 1 and 2 im- plied that moisture and altitude were the main influential factor for vegetation composition and distribution in the study area. There were significant differences in plant community structure, distribution, and the changes in TSR with altitude between two slopes of Mila Hill. The plant community structure was more complex in the western slope than that of eastern slope. TSR was decreased with increasing in altitude in the western slope but an oppo- site situation found in the eastern slope.

关 键 词：植物群 双向指示种分析 除趋势对应分析 转换物种丰富度 米拉山 

分 类 号：Q948[生物学—植物学]