日本落叶松人工林心腐率的调查

Investigation on Heart Rot Rate of Larix kaempferi

通过对40年生以上的日本落叶松(Larix kaempferi)人工林心腐的调查研究,结果表明,日本落叶松随林龄的增长,根部腐朽会越来越重,40年时腐蚀率达39%,50年达69%,60年达84%。心腐对日本落叶松的生长影响很大,树高和胸径生长量明显下降,同时也严重地影响林木的质量和产值。所以,对林龄较大的日本落叶松应及时主伐更新,避免因心腐过重给经济带来巨大的损失。

Heart rot of Larix kaempferi above 40-year-old were investigated .Result shows that ：root rot of Larix kaempferi will become increasingly serious with the increase of forest age ;heart rot rate of 40 ,50 ＆ 60-year-old Larix kaempferi are 39% ,69% ,84% ,respectively ;influence of heart rot on the growth of Larix kaempferi is great ;growth of tree height ＆ diameter decrease significantly ;the quality ＆ value of trees were seriously affected . Therefore ,final felling regeneration should be conducted on Larix kaempferi with more tree rings to avoid huge los-ses by too sever heart rot to the economy .