欢迎访问林业科学,今天是

›› 1981, Vol. 17 ›› Issue (4): 370-378.

• 论文及研究报告 • 上一篇    下一篇

杉木不同密度造林试验研究

阮瑞文 窦永章   

  1. 广西柳州地区林业科学研究所
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1981-11-25 发布日期:1981-11-25

A STUDY ON VARIOUS PLANTING DENSITIES FOR AFFORESTATION OF CHINESE FIR

Ruan Rui-wen,Dou yong-zhang   

  1. Forest Research Institute of Liuchow Prefecture,Kwangxi Province
  • Received:1900-01-01 Revised:1900-01-01 Online:1981-11-25 Published:1981-11-25

Abstract: This paper reports the result of influences to the growth of Chinese fir caused by adopting six various planting densities of 240,167,122,94,74 and 60 trees/mu. The results demonstrate that variation in planting density has an obvious influence to diameter growth (breast diameter) of the trees.It usually increases as the planting density decreases.But there is a limitation that the diameter-growth will not increase in proportion to the rule of variance of planting density,after the trees in a plarltation of 60 trees/mu have been planted for 15 years. There is no rule derivable from the influence of variance of planting density to the growth in length of Chinese fir.The duration in terms of years for the increase of crown width and length prolongs as the planting density decreases. Growth of individual tree in terms of volume increases as the planting density decreases.The biggest volume increment per unit area belongs to the plantation of 122 trees/mu,reaching 21.1575m~3. The result of our experiment shows that the most suitable planting density for Chinese fir is 122 trees/mu and thinning is not necessary for this plantation.