退化喀斯特森林自然恢复评价研究

在研究贵州茂兰国家级自然保护区退化喀斯特森林自然恢复过程中群落组成、结构、功能的基础上，提出了退化群落恢复潜力度、恢复度和恢复速度３个评价指标和计算方法，分析了退化群落在自然恢复过程中群落高度、盖度、实生株／总株数、组成结构、显著度、生物量等特征指标的恢复潜力度、恢复度和恢复速度的变化，并进行综合评价。结果表明：低一级演替阶段群落向相邻更高一级演替阶段群落恢复的潜力度最高，群落自然恢复是由低级阶段

A STUDY ON EVALUATION OF NATURAL RESTORATION FOR DEGRADED KARST FOREST

Based on study of component,structure,function of degraded Karst forest in the natural restoration process in Maolan National Reserve of Guizhou Province,three evaluation indexes such as restoration potential degree ( RP ),restoration degree( RD ),restoration speed( RS ) and their calculating methods were proposed.Variation and comprehensive evaluation of RP,RD and RS of community feature indexes which reflected component,height,coverage,seedlings/total trees,dominance and biomass were analyzed.The results showed that there were the highest RP between the lower and the next to higher succession stage,so as that natural restoration of degraded community was a process in which lower community was replaced by its next higher one successively.There were higher RP but lowest RD and slower RS in the early stage;the highest RP ,the fast RS and moderate RD in the mid stage;the lowest RP ,the slowest RS and the highest RD in the late stage.The RP of community was slower than that of community feature indexes,and the RS of total function was slower than its part one.In community feature indexes, RS of component,height,coverage,seedlings/total trees and dominance were faster than that of biomass,the fact indicated that RS of structure was fast than that of function.The natural restoration strategy was that the regeneration in early stage changed into the community structure adjustment in mid stage,and finally to the structure and function coordination or improvement in late stage.The normal community component,physiognomy,structure could be presented after 40 to 50 years natural restoration,but it take a long time to restore total community function.