蒙古栎天然次生林改培大径级材技术研究

在吉林蛟河地区开展蒙古栎天然次生林改培育大径级材林试验,结果表明:松江林场的天然次生蒙古栎林改培效果最为明显,其每年胸径增长量为0.44cm,平均增长率为5.59%,材积每年平均增长率为6.73%;不同立地条件及不同间伐强度对培育大径级材林影响差异显著,最佳间伐强度为28%,最佳立地条件为西南坡或南坡,胸径生长量最佳的为坡下,坡度为4°的长势良好,郁闭度为0.9的改培育效果最好。

Cultivating Natural Secondary Forest of Quercus mongolica To Large Diameter Class Timber Forest

Cultivating natural secondary forest of Quercus mongolica to large diameter class timber forest in Jiaohe area of Jilin Province were conducted.Result shows that the most obvious effect of cultivation for natural secondary forest of Quercus mongolica is in Songjiang Forest Farm,the annual DBH growth of it is 0.44 cm,with an average growth rate being 5.59%;the average growth rate of volume per year is 6.73%;the different site conditions and different thinning intensities have significant effects on breeding large diameter timber forest,optimum thinning in-tensity is 28%,the optimal site conditions is southwest slope and the southern slope;the optimal DBH growth is at down slope;the growth of slope being 4 degrees is well;the cultivation effect of crown density of 0.9 is optimal.