黄土丘陵区狼牙刺群落恢复过程中物种多样性动态研究

研究不同恢复阶段狼牙刺群落下植物恢复过程的动态特征:从灌木和草本各层的物种多样性指数看,不同阶段狼牙刺群落表现出大致相同的趋势,即草本层>灌木层。同一层次的物种多样性指数D和H′虽然数值不同,但在不同阶段狼牙刺群落有基本一致的趋势,灌木层物种多样性指数基本上随恢复时间的增加而增加;草本层多样性指数在荒草地阶段较高,其他阶段的狼牙刺群落随恢复时间的增加而减少。随着群落恢复,群落相似性增加。总体上,随着狼牙刺群落的恢复,不同科属的植物种类在增加,群落生态优势度增加,群落趋向稳定。采取封禁措施,减少人为干扰,是狼牙刺群落恢复的有效途径。

Study on the species diversity dynamics of Sophora davidii community in Loess Hilly region

The dynamic characteristics for recovery process of undergrowth plants in different aged Sophora davidii were studied.The results showed that species richness and species diversity indexes of different layers in the forest stands are as follows: herb layer>shrub layer.D and H′of species diversity indexes of identical layer are different,but it has basically the same tendency in different growth stages of Sophora davidii community.Species diversity indexes of shrub layer increase with increasing time.Species diversity indexes of herb layer in one yearly stage is bigger and in the other stage they decline with time increasing.The similarity of Sophora davidii communites is increased with time increasing.On the whole,different plants and families have impeoved greatly and ecology dominance of communities have improved and communities are stabilized greatly.The limited human disturbances is the effective measure for Sophora davidii community recovery.