【摘要】 为确定湿地松、火炬松工业用材林的适宜初植密度 ,在中、北亚热带地区 5个地点营建了试验林。依据 6～ 7a的调查结果 ,分析了初植密度对林分个体生长、群体发育、形质和材性等因子的影响 ,和不同密度下由于林分发育进程的不同所产生的生长因子的变化。综合分析生长和经济因素 ,提出了我国中、北亚热带地区两个工业用材林树种的初植密度模式。 6～ 7年生时林分平均胸径和单株材积各试点不同密度间大多差异显著 ,单位面积蓄积随密度加大而增加 ,小径材实际出材量以中密度为大。高密度林分个体分化加剧 ,现时间伐则属非商业性作业 ,且高密度林分造林成本较高。由于树种习性差异 ,相同条件下湿地松林分密度应大于火炬松。建议湿地松中小径建筑材和纸浆材的造林密度为 16 6 7～ 2 0 0 0株· hm-2 ,火炬松为 1111～ 16 6 7株· hm-2 。更多还原

【Abstract】 The test stands were established at five sites in the central and north subtropical region of China in order to determine the suitable initial planting densities of industrial timber plantation of slash pine and loblolly pine.According to 6～7 years’ field survey results the effects of initial density on the stand factors of individual tree growth,population development,tree form and wood property,and the changes of growth factors due to the difference of stand development process were analyzed.Based on the comprehensive consideration of biological and economic factors,the initial planting density patterns is suggested as follows:with the site index of 14～18,the densities are 2 000～1 333·hm -2 for slash pine,1 667～1 111·hm -2 for loblolly pine.The densities of 2 000～1 667·hm -2 are adopted for unthinning pulping timber stands,or compound target of pulping timber and middle dimension timber with thinning;1 667～1 111·hm -2 and thinning are adopted for cultivation of middle and large dimension timber. Meanwhile,the necessary cultural measures are put forward for the realization of above management goals.更多还原