喀斯特植被恢复过程的群落演替特征

Characteristics of Community Succession in Karst Vegetation-Restoration Process

采用空间代替时间的方式对黔中喀斯特地区植被进行样方调查,结果表明:随着演替进程及群落高度增加,实生树木比例增加,但是S3大于S4阶段;喀斯特地区植被物种多样性增加,但多样性指数最大为S2灌木阶段,最小为S1草本阶段.演替阶段不同物种重要值不同,其中以云南鼠刺为整个演替进程的优势物种.乔木树种在各个演替阶段中S1阶段物种数量最少,而在S3和S4阶段物种数量较大;灌木树种在S2阶段数量最大,在S1和S4阶段数量较少.随着演替进程增加,乔木树种的盖度增大,尤其在S4阶段中乔木比例成分最大;灌木树种在S2中表现出最大的群落盖度,而S3和S4中则盖度显著降低.

Investigation of field-plots was done by spatiotemporal substitution in a Karst area of Qianzhong （Central Guizhou）. The results showed that height of community and trees/seedlings percentage increased with the succession process, being greater in Stage S3 than in Stage S4; species diversity also increased with the succession process, with the maximum occurring in the shrub stage （S2） and the minimum in the herbage stage （S3）. The importance value of different species varied with different succession stages, Itea yunnanensis being the dominant species throughout the succession stages. Minimum number of tree species existed in S1 while plurality occurred in S3 and S4. Maximum number of shrub species was recorded in S2 while fewer in S1 and S4. With the process of succession, coverage of trees species increased, especially in Stage S4. The best coverage of community of shrub species existed in S2 and decreased sharply in S3 and S4.