海拉尔西山30a生不同密度沙地樟子松人工林调查研究

[HT3XBS]Investigation on 30-year-old Pinus massoniana Plantations at Various Densities in Xishan,Hailaer

对海拉尔西山30a生不同密度沙地樟子松人工林生长状况和土壤水分进行对比分析,结果证实不同密度沙地樟子松人工林的土壤含水量,林分结构、组成、更新能力均存在显著差异。初步认为海拉尔西山密度为7株/100m2或8株/100m2(即47株/亩或53株/亩)的30a生沙地樟子松人工林生长状况和综合效益较好。随着单株个体的生长,不同密度沙地樟子松人工林易引起光、水分及养分的竞争,不利于林分健康而稳定生长,因此,进入中龄期后,必须对初植密度进行人为调控,才能保证沙地樟子松人工林可持续、健康生长与林分的稳定性。

This paper compared and analyzed the growth conditions and soll water of 30-year-old Pinus massoniana plantations at various densities in Xishan,Hailaer The results demonstrated that it existed positive differences among soil water, stand structure, composition and renewing ability of Pinus massoniana plantations at various densities. It was considered preliminarily that the growth conditions and comprehensive effects of 30- year-old Pinus massoniana plantations at densities of 7/100m^2 or 8/100m^2 were better than others. When individual plant grew up gradually, Pinus massoniana plantations at various densities began to compete for light, water, nutrient and it was bad for stand growing up healthily and steadily. So when reached to middle age, Pinus massoniana plantations had to be regulated by human for Initial planting density in order to assure Pinus massonlana plantations sustainable, health, steady.