马尾松大径材培育密度的测定

本文通过对三元区马尾松人工林和人工促进天然更新林分生长过程的研究，结果表明：在中等以上立地条件，马尾松稀植林分，其胸径、树高速生期一般在5—20年。材积速生期可持续到30年左右。马尾松大径材定向培育，初植密度120—167株／亩为宜，间伐二次，最后一次在20年前完成，最终每亩保留35—43株，35年左右进行主伐。

THE RESEARCH ON THE DENSITY OF CULTIVATING BIG - DIAMETER TIMBER OF PINUS MASSIANA LAMB

The determination was run for the cultivation processes on the artificial forest of Pinus massiana Lamb and the natural regenerative forest due to artificial stimulate treatment. Results indicated that the rapid growth period was 5 - 20 years for the diameter and height of trees in the woodland with the condition better than middling level. The sustainable rapid growth period could be lasted to 30 years. The initial growth density could be 1800 -2505 trees/hm^2 ; with twice intermediate cutting. The last cutting time was about 20 years after planting ; finally, kept the density of 525 - 645 trees/hm^2 for the forest. The lopping time was about 35 years after the planting time.