水曲柳造林密度与林分生长的关系

为确定水曲柳人工林合理的造林密度，以帽儿山实验林场10年生的水曲柳密度试验林为研究对象，分析了造林密度对林分生长的影响，结果表明：1m×1m（A）、1．5m×1．5m（B）、2m×2m（C）、3m×1．5m（D）4种不同造林密度对林木生长、林木的干形、林分的产量均有显著地影响，其中林分胸径、单株材积、冠幅、单株叶面积、冠高比随密度的减小而显著增大；造林密度对树高生长、叶面积指数无显著影响。综合比较4种密度水平林分，C水平的造林密度是最为合理的。

Effect of Initial Spacing on Growth of Fraxinus mandshurica Plantation

To find out the feasible initial spacing of Fraxinus mandshurica plantation, we examined the relationship between initial spacing and stand growth by using the data obtained during 10 years from the experiment stand （including 1m×1m （A）, 1. 5m×1.5m （B）, 2m×2m （C）, 3m×1. 5m （D） 4 density levels） which was located in Mt. Mao＇er. The results showed that it had significant effects on timber growth, timber stem form and stand volume production. With the increase of planting density, diameter at breast height, single tree volume, crown diameter, individual tree leaf area, ratio of crown length to tree height decreased, but tree height and growing stock increased. Planting density had no significant effect on height growth and leaf area index. Based on these results, the density level C was the most feasible plantation density in four density levels.