The chinese fir plantations cultured by rmc method not only have the ideal vertical structure and habitat diversity but have their species diversity indexes beyond the lower limit of that of evergreen broad - leaved forsets in jiangxi province 以残留管理育林法所培育的林分,不仅其物种多样性指数已超过江西常绿阔叶林物种多样性指数的下限,而且还具备良好的垂直结构及较高的生境多样性。
A good forest structure could improve the even degree and range of distribution obviously , and improve the porosity ; the fractal dimension ( fd ) and mean weight diameter ( mwd ) could sign the soil structure feature objectively 良好的林分结构能明显提高土壤粒径的分布均匀程度与范围，改善土壤孔隙状况；分形维数和重量平均直径能比较客观地表徵土壤结构特徵，是较为理想的土壤结构测定指标。
According to the crown growth characteristics in industrial eucalyptus stand of short rotation , the unit step function model was put forward for the process with changing point of short rotation eucalyptus clones u6 based on the survey practical stands 摘要针对短轮伐期桉树人工林林分冠幅生长的特点，在现实林分调查的基础上，模拟提出了适合有变点的短轮伐期桉树u6无性系林分冠幅生长阶跃函数模型。
This paper gives a survey on experimental forestland . 25 tree species were selected , and arranged in order by average diameter at breast height , average height , average individual volume and annual average volume increment in a unit area in this experiment 摘要简要介绍了试验林地的概况，选择了25个树种进行试验，并按各树种林分平均胸径、平均树高、平均单株材积和平均单位面积蓄积的年平均生长量进行排序。
