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我省苏南山区南段的磨盘山和大山口局部地段保留着北亚热带植被景观,生长着许多高大的乔木,为了分析研究不同树种生长特性及其规律,我们对这六种生长较好的树种做了树干解析,结果如下:1.马尾松(Pinus massoniana)单株解析木49年生,高15.1米.胸径40.5厘米.单株材积0.93679立方米.从生长量看,49年时尚未达到数量成熟阶段.材积连年生长量30龄阶时出现低势.18—20龄阶前为生长旺盛期.胸径以1厘米/年的平均速率上升.树高在12—15年以后趋于减势.从材积平均生长量看,49年仍未见大幅度下降趋势且平缓增长.胸径平均生长量也仍然平缓增加.可见马尾松在茅山
In the southern section of southern Jiangsu province, the northern part of Mopanshan and Da Kawaguchi retain the northern subtropical vegetation landscape, growing many tall trees, in order to analyze the growth characteristics of different tree species and their laws, we better growth of these six species of trees The results of trunk analysis were as follows: 1. The Pinus massoniana single plant was 49 years old with a height of 15.1 meters and a diameter of 40.5 centimeters with a volume of 0.93679 cubic meters per plant. Stage.All the annual growth rate of volume of material appears low at 30. The height of 18-20 before the order of growth.Both diameter at an average rate of 1 cm / year.The tree height tends to decrease after 12 to 15 years from Volume growth of the average volume, 49 years, still no significant downward trend and a gentle growth, the average growth of DBH is also still a gentle increase.It can be seen in the Maoshan