阿勒泰小克兰河上游植物群落的垂直分布格局及环境分析

Vertical Distribution and Environmental Analysis of Plant Communities in Upper Reaches of Crane River in Aletai

通过对阿勒泰小克兰河上游的植被调查,并运用植物多样性指数计算及冗余分析,探究植物随海拔梯度的变化规律。结果表明:在各海拔梯度内优质牧草均占优势地位,在海拔1050 m^1450 m和2150 m^2550 m分布着草本群落,1450 m^2150 m乔、灌、草均有分布;随着海拔上升,Simpson、Shannon-Wiener多样性指数单调微增,Simpson优势度指数单调递减,Bray-Curtis指数和Margalef指数呈单峰分布,Pielou指数、S-Φrenson指数、Morisita-Hom指数呈"U"型变化;冗余分析发现海拔、坡向是影响植物群落组成及分布的主要因子。

Through the vegetation investigation in the upper reaches of Crane river in Aletai, the change of plant with altitude gradient was explored by plant diversity index and redundant analysis. The results showed that high-quality forage grass was dominant in each altitude gradient. Herbaceous communities distributed in the altitude from 1 050 m to 1 450 m and 2 150 m to 2 550 m. Arbor, shrub and grass distributed in the altitude from 1 450 m to 2 150 m. As altitude increased, Simpson index and Shannon-Wiener index increased slightly and monotonically, Simpson dominance index decreased monotonically, Bray-Curtis index and Margalef index showed unimodal distribution, Pielou index, S-Φrenson index and Morisita-Hom index showed a "U"curve change. Elevation and aspect were the main factors affecting the composition and distribution of plant communities by redundant analysis.