海拔梯度对塔尔巴哈台山地鸭茅群落物种组成及多样性影响

基于种质资源保护与开发的角度,在新疆塔尔巴哈台山海拔1 300-1 900 m鸭茅(Dactylis glomerata)分布的集中区域,对鸭茅群落在天然草地不同海拔地段的数量特征及物种多样性进行了研究。结果表明,塔尔巴哈台山鸭茅群落数量特征随海拔升高存在一定差异,但未呈现出规律性变化;鸭茅种群始终为群落中的优势种,重要值均保持在35%以上;当海拔升高时,α多样性出现先减小再增加的变化,呈"V"字型;β多样性表现出较高的群落相似度,出现有较多的共有种;物种多样性与海拔整体上呈负相关关系,说明随海拔升高物种种类整体上趋于减少。研究结果初步揭示了分布于塔尔巴哈台山地不同海拔地段鸭茅群落的数量特征与物种多样性的差异,以及生境条件对物种组成特征与多样性的影响。

Species diversity and characteristics of a Dactylis glomerata community at different elevations in Tarbagatai Shan

For the protection and development of germplasm resources,the quantitative characteristics and species diversity of the Dactylis glomerata community in different elevation areas of a natural grassland were studied in the concentrated area of 1300-1900 m above sea level in Tarbagatai Shan,Xinjiang.The results showed that there was a difference in the number of characteristics in the Tarbagatai Shan;however,there was no regularity in the change.D.glomerata was always the dominant species in the community,and the importance values were more than 35％.When elevation was increased,the variation in α diversity decreased first and then increased,forming a V-shaped curve.The β diversity exhibited higher community similarity,and there were more common species,and the species diversity was negatively correlated with altitude,indicating that the species tended to decrease with altitude.The results of the study revealed a difference in the number and species diversity in the D.glomerata community at different elevations of Tarbagatai Shan area,and the effects of habitat conditions on species composition and diversity.