3种针叶材年轮宽度和管胞长度变异特性研究

对辽宁省章古台固沙造林研究所的油松、樟子松、赤松人工林木材年轮宽度与管胞长度的测定表明，油松和赤松直径生长旺盛期约为17a，樟子松直径生长旺盛期短于油松和赤松，但樟子松17a后的直径生长高于油松和赤松；3树种的未成熟材范围均大于20a，油松和赤松未成熟材范围基本相等，油松略大于樟子松；三者管胞长度在距离髓心第1～8年轮间基本相等，从距离髓心的第9年轮起，樟子松管胞长度小于油松和赤松；3树种管胞长度在距离地面0．2m高度处出现最小值，油松管胞长度在树干轴向呈“短-长-短”的变化模式，在距地面6m处管胞长度再度出现变短趋势。

Variations in Tracheid Length and Ring Width of Three Coniferous Trees

Determination on ring width and tracheid length of Pinus tabulaeformis, P. sylvestris var. mongolica and P. densiflora planted in Zhanggutai, Liaoning province showed that thriving stage for diameter was 17 years in P. tabulaeformis and P. densiflora, 10 years in P. densifora with higher diameter growth after the 17th year. The immature age of three tree species was over 20 years, that of P. tabulaeformis was similar with that of P. densiflora, but larger than that of P. sylvestris var. mongolica. The trach...