都昌县多宝砂山物种多样性研究及保护初探

对鄱阳湖都昌县多宝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的绝灭与定居特点.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绝灭,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于风沙化过程的各个阶段,在风沙化过程中植物种的绝灭速率大于定居速率.最后,针对造成多宝砂山生物多样性衰减的原因,提出了治理对策,即在控制人类行为干扰的同时,要加强对固定沙丘的管理与保护. 

Research on Species Diversity on Duobao Sandy Hill in Duchang County and Elementary Discussion on Its Protection

The changing characteristics of species diversity during the process of desertification on Duobao sandy hills in Duchang County in Poyang Lake area were analyzed. 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 were discussed. The species diversity indices show that process of desertification is a process of biodiversity loss. In particular, specialized species become extinct first, and rare species vanish second. Change in hfe-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. In the end, aimed at the cause of attenuation of biodiversity of Duobao sandy hill, the authors present the harness countermeasure that the disturbance of human behaviors should be controlled and at the same time the management and protection of stabilized dunes should be strengthened.