摘要
石漠化是喀斯特地区面临的主要环境问题,通过样地调查法对贵州花江喀斯特峡谷不同石漠化等级植物群落区系特征进行研究,并对潜在、轻度、中度及强度石漠化样地的物种相似性程度进行计算。结果表明,喀斯特峡谷石漠化群落地理成分复杂,分布类型丰富多样,热带性质明显。就群落相似性系数而言,在相同石漠化等级的样地内部,各样地间平均相似性系数为43.93%。同一等级中相似性系数均值最高的是潜在石漠化。群落所有物种共有度的几个谷值分别出现于潜在石漠化～轻度石漠化、轻度石漠化～中度石漠化之间,且其绝对值均小于30%,表明其确已成为群落类型与石漠化等级的转折点。
The problem of rocky desertification is the main environmental issue in karst area. We take plot investigation to study the flora characteristics at different rocky desertification degrees, and focus on co-occurrence of all species among communities at different plots. The results indicated that distribution types are various and geographical elements are complex. The species co-occurrence of communities is 43.93% of different plots in the same desertification degree area, and the highest similarity is in the latent karst rocky desertification. The valley values of species co-occurrence of communities are latent to slight rocky desertification, slight to medium rocky desertification. The absolute value is less than 30% , which suggests the turning point.
出处
《贵州师范大学学报（自然科学版）》
CAS
2011年第3期9-13,共5页
Journal of Guizhou Normal University：Natural Sciences
基金
国家自然科学基金面上项目(No.30872007)
贵州省优秀科技教育人才省长专项资金项目(黔省专合字(2007)33号)
贵州省自然科学基金项目(黔科合J字[2008]2063号)
关键词
区系特征
群落相似度
喀斯特石漠化
贵州花江
flora characteristics
species co-occurrence of communities
karst rocky desertification
Huajiang of Guizhou Province
