东北东部山地樟子松人工林的经济生产力

采用定位固定样地和临时样地调查相结合的方法,共计调查样地130多块,收集样地调查资料300多块;调查解析木120多株;收集已有解析木材料300多株。首先利用解析木材料建立了樟子松的Demaerchalk Ⅰ削度/材积方程系统,并利用这个系统和样地及解析木材料,计算和分析了东北东部山地樟子松人工幼林经济生产力水平。分析结果表明:(1)按照现实的樟子松人工林密度体系,幼龄阶段(40年以下)只能获得较高产量的小径材,无法获得较高产量的小头直径12 cm的高级纸浆材,更无法获得小头直径20 cm以上的大径材。要想在尽快获得大径级用材,就必须采用比现实林分低得多的密度体系;(2)采用较高的初植密度,并采用强度较大的间伐机制,对小径材和大、中径材的生产都是有利的;(3)樟子松人工林在密度适当的情况下,达到本地区速生丰产林对蓄积增长量的要求是完全可以的。

TIMBER PRODUCTIVITY OF YOUNG MONGOLIAN SCOTS PINE PLANTATION IN EASTERN MOUNTAIN REGIONS OF NORTHEAST CHINA

We investigated more than 130 temporal and permanent sample plots and analyzed more than 120 stems, and collected data of more than 300 temporal and permanent sample plots and 300 analyzed stems. We established a system of DemaerchalkⅠtaper equations by using these analyzed stem data. We calculated and analyzed the timber productivity of young Mongolian Scots pine plantation in eastern mountain regions of Northeast China. The results indicated that by current stand density regime, (1) in young stage (below 40 years old) we can get high-yield small-sized timber but not high-yield pulpwood, not to say large-sized timber; if we hope to get large-sized timber in the young stage, we must adopt a low density system; (2) high planting density and severe thinning regime is favorable to all kind of timber production; and with proper density system;(3)the growth of Mongolian Scots pine can meet the demand of stock increment criterion for fast-growing and high-yield plantation of Mongolian Scots pine plantation in eastern mountain regions of Northeast China.