抚顺地区日本松干蚧不同虫口密度对油松生长量的影响

Effects of Different Population Densities of Matsucoccus matsumurae on the growth of Pinus tabulaeformis in Fushun

本文调查了日本松干蚧不同虫口密度对油松生长量的影响,结果表明:不同的虫口密度对油松的危害程度不同,虫口密度等级为0级的样株,与虫口密度等级I级的样株相比较,二者的连年生长量相差不大;虫口密度等级为0级样株较Ⅱ级样株的树高连年生长量高0.14 m,材积连年生长量高0.0028 m^3;虫口密度等级为0级样株较Ⅲ级样株的树高连年生长量高0.25 m,材积连年生长量高0.0036 m^3。

The effects of different population densities of Matsucoccus matsumurae on the growth of Pinus tabulaeformis were investigated in this paper,the results showed that the harm degree of different insect population density to Pinus tabulaeformis Carr.was different,compared with the sample plants of population density grade I,the annual growth of the samples with the grade 0 was not much different.Compared with the sample plants of population density gradeⅡ,the annual growth of height with the grade 0 was more than 0.14 m,the annual growth of volume was more than 0.0028 m^3.Compared with the sample plants of population density gradeⅢ,the annual growth of height with the grade 0 was more than 0.25 m,the annual growth of volume was more than 0.0036 m^3.