湖南舜皇山不同海拔森林线附近群落结构与物种多样性

为了研究湖南舜皇山不同海拔森林线附近群落结构与物种多样性,在舜皇山东南坡海拔683～1883 m每隔300 m设立5个森林线,在森林线样方调查基础上,分析森林线附近的物种组成、群落结构特征和群落的多样性指数。结果表明：(1)在森林线5个海拔的样地中共有种子植物28种,分属17科19属；(2)群落结构总体上呈现出增长的趋势；(3)随海拔高度的增加,Shannon指数、Alatalo指数呈现出“n”形变化规律,Simpson指数呈现出“U”形变化规律, Cody指数显著降低(P＜0.05),海拔(1583～1883 m)的Jaccard指数显著高于海拔(683～1283 m)的Jaccard指数(P＜0.05)。

Community Structure and Species Diversity near the Forestline of Different Altitudes in Shunhuang Mountain,Hunan

The paper aims to study the community structure and species diversity of near the forestline of different altitudes in Shunhuang mountain, Hunan. The author established 5 forestlines, every 300 m, from altitude of 683- 1883 m, and on the basis of sampling investigation, analyzed the species composition, community structure properties and diversity index near the forestline. The results showed that: (1) there were 28 species of plants belonging to 17 families and 19 genera in 5 altitude sampling plots near the forestline; (2) in general, community structure had an increasing trend; (3) with the increase of the altitude, Shannon index, Alatalo index had the“n”curve regulation, Simpson index had the“U”curve regulation and Cody index significantly decreased (P＜0.05); Jaccard index of altitude from 1583 m to 1883 m was significantly higher than that of altitude from 683 m to 1283 m (P＜0.05).