江西吉安松褐天牛发生与林分因子关系研究

Study on the Relationship between Forest Factors and Occurrence of Monochamus alternatus Hope in Ji'an City,Jiangxi Province

[目的]探讨江西吉安市松褐天牛在林间的发生与环境的关系。[方法]运用主成分分析法和回归分析方法对郁闭度、地被覆盖率、平均胸径等11个林分因子与松褐天牛种群数量的关系进行分析。[结果]郁闭度、地被覆盖率、平均胸径、冠幅和海拔对松褐天牛的发生贡献较大,而郁闭度、地被覆盖率和平均胸径对松褐天牛种群数量影响极显著,且均呈负相关。利用郁闭度、地被覆盖率、平均胸径与松褐天牛种群数量建立多元线性回归模型,模型显著。[结论]江西吉安市松褐天牛的发生与马尾松林的郁闭度、地被覆盖率和马尾松平均胸径有密切关系。在实际工作中,应重点对郁闭度小、地被覆盖率低和生长状况不良的马尾松林中松褐天牛的发生情况进行监测和防治。

[ Objective ] The paper was in order to investigate the relationship between environment and the occurrence of Monochamus alternatus Hope in the pine woods in Ji＇an City ,Jiangxi Province. [ Method] The relationship between M. alternatus Hope population quantity and forests factors was analyzed by using the methods of principal component analysis and stepwise regression. [ Result] The result showed that canopy density, ground coverage rate, average breast diameter, canopy, altitude were the factors contributed largely to the occurrence of M. alternatus Hope respectively, and the canopy density,ground coverage rate,average breast diameter had significant effects on the population of M. alternatus Hope with negative correlation. Further more the multivariate regression models on correlation relationship between the population of M. alternatus Hope and canopy density, ground coverage rate, average breast diameter were established, and the models reached significant level. [Conclusion]The occurrence degree of M. alternatus Hope was closely related to canopy density, ground coverage rate and average breast diameter of Pinus massoniana forest. In actual work, we should focus on monitoring and controlling M. alternatus Hope occurrence in the small canopy density, low coverage and poor growth of P. massoniana forest.