元江流域干热河谷草地植物群落结构特征与相似性分析  

The structure characteristic and analysis on similarity of grassland community in dry-hot valley of Yuanjiang River

作　　者：沈蕊[1] 张建利[1,2] 何彪[1] 李峰[1] 张志明[1] 周睿 欧晓昆[1] 

机构地区：[1]云南大学生态学与地植物学研究所,云南昆明650091 [2]贵州大学林学院,贵州贵阳550025

出　　处：《生态环境学报》2010年第12期2821-2825,共5页Ecology and Environmental Sciences

基　　金：云南省基础研究重点项目(2009CC003);国家自然科学基金项目(30860053);国家973重点基础研究项目(2003CB415102)

摘　　要：选择元江干热河谷典型草地群落,采用标准样地调查法,对流域上、中、下游干热河谷草地植物群落的分布特征、群落结构、种群习性等特征开展研究,结果表明:(1)元江流域上游祥云和中下游红河干热河谷草地群落中出现的植物种类最多,元江流域干热河谷草地植物群落是以灌木为主、多年生草本为辅的结构类型。(2)元江流域干热河谷草地群落中,扭黄茅(Heteropogon contortus)为优势种群,次优种群随流域环境的改变而不同。(3)元江流域干热河谷草地植物群落之间的相似性系数均在0.00～0.25之间,处于极不相似水平,种群的扩散受流域河谷通道作用影响较小。(4)种群的扩散和定居受海拔高度的影响,随着海拔高度的变化,植物群落的组成也发生变化,形成不同的群落结构。This study was conducted to investigate the distribution patterns,community structure and population characteristics of grassland communities in the dry-hot valley along Yuanjiang River.Our results showed that（1） The number of plant species within grassland communities in Xiangyun County and Honghe County located in the upper and the middle to lower of Yuanjiang River respectively were the most abundant among study region.The communities in the dry-hot valley of Yuanjiang River is determined by shrub species accompanied with some perennial grass species.（2） The population of Heteropogon contortus（Poaceae） is dominant species of grassland communities in the dry-hot valley of Yuanjiang River.The sub-dominant plant population appeared to be variable dependent on the characteristics of environmental and climatic conditions of habitats.（3） The similarities were extremely low among grassland communities in the dry-hot valley of Yuanjiang River with similarity indexes from 0.00 to 0.25,the population dispersal along the river corridor in this region was minor.（4） The dispersal and inhabitation of plant populations within grassland communities in dry-hot valley of Yuanjiang River were influenced by elevation.The structures of plant populations were different due to the variations in the compositions of plant populations along with altitudinal gradients.

关 键 词：元江 次生萨王纳 重要值和优势度 Jaccard相似性 

分 类 号：Q948[生物学—植物学]