关键词: EC50, EC50, 中草药提取物, 增效作用, 桃褐腐病菌, 菌丝生长抑制率

Abstract: 【OBJECTIVE】Based on the investigation to conserved forest communities in Wanmulin Nature Reserve(C) and human-caused disturbed forest communities(D) in Jianou city, the effects of human-caused disturbance on the sorts of species and their quantitative characteristics of evergreen broad-leaf forest were analyzed; 【METHOD】The sorts, number, length, diameter at breast height, crown diameter and living form of species in each plot were recorded, and the importance values, frequency-density value and community dominance were analyzed; 【RESULTS】The sorts of species were increased in D; The evolution of C came to a relatively steady level whereas the D communities were evolving to the typically local vegetation types with more species; There are more shade species in C communities whereas there were more neutral and heliophilous plants in D communities; At the layer below 3m height, each species attained the same important value; The dominance index of C community was higher than that of D; 【CONCLUSION】The species diversity of communities could be maintained and even then increased by the combination of a certain degree of human-caused disturbance and mountain closure. The disturbed communities will evolve to the typically local vegetation types by mountain closure.