【摘要】 对鄱阳湖砂山地区土地风沙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风沙化土地的出现频率与不同风沙化阶段各生活型植物种的组成,探讨了风沙化过程中植物种绝灭与定居特点。物种多样性指数分析表明:风沙化过程是物种多样性衰减的过程,风沙化首先导致特有种的灭绝,其次为稀有种。从植物的生活型来看,多年生草本与乔木类植物受风沙化影响最大,而灌木类植物可存活风沙化过程各个阶段,在风沙化过程中植物种的绝灭速率大于定居速率。更多还原

【Abstract】 This paper analyzes the changing characteristics of species diversity during the process of sandy hills area of Poyang Lake,Jiangxi province.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 process of desertification is a process of biodiversity loss.In particular,specialized species died out first,rare species vanished second.Change in life-form composition indicates that perennial herbaceous and arbor plants are severely affected by process of desertification,whereas shrub species occur at all stages of process of desertification.The extinction rate of plants in this area is higher than their colonization rate.更多还原