辽宁东部山区高龄日本落叶松林的生长分析

以辽宁省东部山区残存的少量高龄日本落叶松人工林为对象，调查分析了林分及林木的生长特征。结果表明，在林龄60～86年生的日本落叶松人工林分当中，直径≥30cm的大径材比率均在90％以上；各调查林分的胸径连年生长量还维持着一定的旺盛生长势，间伐后胸径生长变化率向正的方向转变趋势明显；与日本落叶松原产地日本长野县相比，林木的树高和胸径生长几乎没有差异。按照日本的落叶松长伐期经营标准，这些调查林分还具有较大的生长潜力，可进一步大幅度延长其培育年限，实施长伐期经营。

Study on the Growth of Old Larix leptolepis Stands in Mountainous Regions of Eastern Liaoning Province

Liaoning province is one of areas with a long history of introduction of Larix leptolepis Gordon and is the largest plantation in China. Production of the short rotation and small dimension wood was the major way of management of L. leptolepis for a long time, as the result, over 60-year-old L. leptolepis stands were seldom to the seen. In recent years, much L. leptolepis plantation were defined as commonweal forest accordiy to classified forest management, therefore, a few L. leptolepis stands would be given up the way of short rotation and be selected the way of long rotation. However, now the management experience of long rotation were absent in China. This paper analyzed the growth characteristics of tree and stand of old L. leptolepis remained in mountainous regions of east Liaoning Province. The results showed that the rate of large dimension wood with diameter at breast height over 30 cm accounted for 90% in 60 - 86-year-old L. leptolepis stands, and current annual increment of diameter at breast height stayed high growth in all investigated stands and the Percentage Growth Change of diameter at breast height were obvious after thinning. Compared with the original region of L. , Nagano-ken in Japan, the of tree and diameter at breast height had not difference. According to the management standard of long rotation of L. leptolepis in Japan, the stand which had much growth potential could be cultivated to its fixed number of year with big extent and put long management into practice.