论文部分内容阅读
通过12年来对油松人工林下层抚育间伐试验地观测,讨论了在不同经营密度下的生长效果。提出了实施间伐的参考技术指标;首次间伐应在17年以前进行,Ⅱ、Ⅲ龄级阶段的最佳经营密度分别为3000～3500株/ha和2500～3000株/ha。在生产中该密度指标可以用来检验间伐设计所确定的经营密度是否合理和可行。
After 12 years of observation on the tending and thinning experiments in the lower layer of Pinus tabulaeformis plantation, the effect of growth under different management density was discussed. The first thinning should be carried out 17 years ago. The best management density in stages Ⅱ and Ⅲ are 3000 ~ 3500 plants / ha and 2500 ~ 3000 plants / ha, respectively. In production, the density index can be used to test whether the operating density of thinning design is reasonable and feasible.