华山松球蚜发生与环境的关系

华山松(Pinus armandi Franch.)是我国长江中上游防护林体系建设工程区域分布较广的乡土树种,也是大规模人工造林的首选树种之一,约占长防林面积的40%,对长防林体系效益的发挥起着重要的作用.华山松球蚜(Pineus armandicola Zhang)是华山松最主要的害虫之一,同时还分泌大量的蜜露,引起煤污病,每年都有大量的华山松林受到危害,轻则降低林木生产量,重则导致整株林木枯萎死亡,尤其在中、幼林中发生最为严重.目前,对该虫的生物学及其天敌、危害情况、综防措施已有研究报道1-3],而发生与环境的关系报道较少.作者于1998-1999年对该问题进行了较系统研究,现将结果报道如下.

Study on Relationship between Occurrence of Pineus armandicola and Environmental Factors

Study on the sampling technique of Pineus armandicola and the relationship between the occurrence of it and environmental factors was conducted in 222 Forest Farm, Dongchuan, Yunnan Province. It was found that the best sampling site is the middle east of the crown canopy. The best sampling number is calculated as the model: N=127.25/ +1.87. Using Latin square orthogonal design, the relationship between the occurrence of Pineus armandicola and environmental factors was revealed. Among the investigated environmental elements, the most important key factor to influence the variance of population density is the tending status of the woods. Other key factors are successively slope direction, elevation and canopy density. Advice on how to control Pineus armandicola is also given.