凹叶厚朴材药两用林定向培育的密度控制

Density Control of Difinite Direction Cultivation of Timber and Medical Use Magnolia officinalis var.biloba Rehd.et wils Plantation

根据密度对凹叶厚朴人工林生长、干材和树皮生物量的影响规律,试验得出凹叶厚朴在 、 类地的造林密度以2500株·hm-2左右为宜.依据不同密度控制方式对林分生长、成材过程、径级结构、出材量和树皮产量的影响程度,认为定向培育凹叶厚朴材药两用林,于12～15a间伐1～2次,目标树保留密度以1505株·hm-2左右较为适宜.以利于改善凹叶厚朴林分结构、促进干材和树皮的合理发育、有效地提高凹叶厚朴人工林的出材量和生产力.

According to the influence of density on the growth,timber and bark biomass of Magnolia officinalis var.biloba plantation,the experiments show the density of 2 500 trees per hectare or so is suitable for Magnolia officinalis var.biloba plantation in site type of Ⅰ,Ⅱ.According to the effect degrees of different density on the growth,lumber process,sizeclass distribution,timber yield and bark yield of Magnolia officinalis var.biloba plantation,the way to definite direction cultivation is determined,which mean the reasonable thinning time is 1~2 times during 12~15 years,and the density of target tree should be retained at 1 505 trees per hectare or so.Such management pattern can improve stand structure,promot well growth of timber and bark,increase the timber yield and productivity effectively.