科尔沁沙地沙漠化过程中的物种多样性

对内蒙古科尔沁地区沙漠化过程中物种多样性的变化特征进行了分析 ,依据植物种在各类型沙漠化土地的出现频率和不同沙漠化阶段各生活型植物种的组成 ,探讨了沙漠化过程中植物种绝灭和定居特点 .物种多样性指数分析表明 ,沙漠化过程是一个物种多样性衰减的过程 ,沙漠化首先导致特有种的绝灭 ,其次为稀有种和普通种 .从植物的生活型来看 ,多年生草本和灌木类植物受沙漠化影响最大 ,而 1年生草本和半灌木类植物可存活于沙漠化过程各个阶段 .在沙漠化过程中植物种的绝灭速率大于定居速率 .

Species diversity during desertification on Kerqin Sandy Land.

This paper analyes the changing characteristics of species diversity during the process of desertification in Kerqin,Inner Mongolia.Based on the frequency of species occurrence and the life form composition of species at different stages of desertification,the characteristics of species colonization and extinction are discussed. The species diversity indices show that desertification is a process of biodiversity loss.In particular, specialized species are wipped out first, rare species vanish second, and common species begin to disappear.Change in life form composition indicates that perennial herbaceous and scrubby plants are severely affected by desertification,whereas annuals and semi shrub species occur at all stages of desertification.The extinction rate of plants in this area is higher than their colonization rate.