金沙江干热河谷锥连栎群落物种组成与多样性特征

Species composition and diversity characteristics of Quercus franchetii communities in dry hot valley of Jinsha River

关键词:  金沙江  干热河谷  元谋  锥连栎  多样性

Key words:  Jinsha River  dry hot valley  Yuanmou County  Quercus franchetii  species diversity

摘要:

金沙江干热河谷元谋段残存的锥连栎群落中植物种类组成较为简单，共发现68种植物，隶属于35科60属，其中，禾本科、蝶形花科、菊科、唇形科等科植物占有较大优势；从植物生活型和功能型来看，群落内以草本植物和多年生植物数量居多，分别占所有植物种类的58.8%和63.2%。不同类型群落中，除了扭黄茅始终为各群落中最为重要的优势种之外，同一草本植物在不同群落中的作用和地位存在较大差异；群落物种多样性及相似性程度较为低下，其Shannon Weiner指数在1.7～2.6之间，且与群落受干扰程度存在较大关联。

Abstract:

Species composition and diversity characteristics of different Quercus franchetii communities in dry hot valley of Jinsha River were studied based on the plots data. The results showed that there was a simple plant species composition in remained Q.franchetii communities in Jinsha River dry hot valley of YuanMou section. In communities，68 plant species were found，which belong to 35 families 60 genera，and Poaceae，Papilionaceae，Asteraceae，and Lamiaceae plants had a large advantage; in the plant life form and functional type，the majority of the plants within communities were herbs and perennials，which occupied respectively 58.8% and 63.2%. In Q.franchetii communities，excepted that Heteropogon contortus was eventually the most important dominant species，the same herb in different communities were quite different in the role and status. Simultaneously，Q.franchetii communities had lower species diversity and similarity，and Shannon Weiner index was between 1.7 and 2.6，which was correlated with the degree of disturbance of communities.