松材线虫病疫木不同伐除方式对森林植物群落演替的影响

采用标准地调查法,对不同立地条件下松材线虫病除治迹地生态系统的植物种类丰富度、密度、多样性指数、均匀度指数及垂直结构情况进行调查和分析。结果表明:立地条件的差异和疫木不同采伐方式对植物群落次生演替的进程和方向都有不同程度的影响。立地条件较好,无论是皆伐、择伐还是不采伐,除治迹地植物群落乔木层和灌木层较受害前纯林的种类丰富度和多样性指数都有一定程度的增加;而立地条件较差的,经皆伐后,植物群落的种类丰富度和多样性指数不仅没有增加,反而降至极低,原有松林群落向灌丛方向退化。

Effects of Bursaphelenchus Xylophilus Disease on Plant Community Succession in Different Harvesting Methods of Infected Pinus Forest

The investigation and analysis on plant species richness,density,diversity index,evenness index and vertical structure of Bursaphelenchus xylophilus disease to governance trace ecosystem were conducted under different site conditions with the standard survey ways.The results show that the differences and site conditions different harvesting methods to tree secondary succession of plant communities on the process and direction have varying degrees of impact.Site conditions are better,whether it is clear cutting,selective cutting or not cutting,with the exception of governance slash communities tree and shrub layer of the victims of the former ones than the pure species richness and diversity index have a certain degree of increase than the old poor conditions,while the clear-cutting,plant communities of species richness and diversity index did not increase,but very low,the original pine shrub communities to the direction of degradation.