黑松是我场的主要树种,纯林占全部森林面积的95％以上。过去,由于我们对树种优劣不分,随意采种育苗造林,不仅造林成活率低,而且大片林木生长缓慢、早期衰退、干形弯曲、发育不良、产量低质量差、病虫害频发多年不能成材。二十二年的黑松林,平均胸径7—8公分,每亩蓄积量3—4立方米,仅产檩条6—7根。 Black pine is my main species, pure forests accounted for more than 95% of the total forest area. In the past, because of our merits and demerits of trees, planting and nurturing plants at will are not only inefficient, but also slow growth of large-scale forest trees, early decline, dry bending, poor growth, poor yield and pests and diseases. Twenty-two years of black pine forest, the average diameter of 7-8 centimeters, 3-4 cubic meters per acre volume, only purlin 6-7 roots.