日本落叶松人工林密度效应的研究

用18a连续测定资料，对不同密度中幼龄日本落叶松人工林生长情况进行了分析研究，结果表明：密度对林分平均树高生长有一定影响，但没有明显的规律，差异不显著；林分的平均胸径和单株材积随密度的增加而减少，其中胸径在1－6a差异不显著，10－14a差异达极显著水平；林分蓄积量则随密度的增加而增大，各密谋间存在显著差异，8－14a差异极显著。

Study on Density Effects of Larix leptolepis Plantations

Based on the data collected during 18 years, the economic benefit and density on the growth of young and half-mature Larix leptolepis plantations with different densities have been studied. The results show that although there exists a certain effect of density on density on average height growth, the law of effect is not conspicuous and the difference is not significant. The average diameter at breast-height and mean sample-tree volume decrease with density increase. Along with the growth of plantations, the difference of diameter at breast-height among treatments is not significant at the age of 1to 6, but turns to be extremely significant at the age of 10 to 14 . However, the stand stock volume increases with density increase, and the difference is not only significant but becomes extremely significant at the age of 8 to 14.