日本落叶松人工林密度效应的研究

Study on Density Effects of Larix leptolepis Plantations

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 ,各密度间存在显著差异 ,8～ 14a差异极显著 .

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.