不同经营密度对华北落叶松林大径材林木生长影响的研究——以塞罕坝机械林场为例

以河北省塞罕坝地区华北落叶松林为研究对象,通过对不同经营密度(150株/hm2、225株/hm2、300株/hm2、375株/hm2及750株/hm2的对照样地)试验样地的调查,研究分析了在相同立地条件,不同林分密度对华北落叶松林的林分胸径、树高、材积及郁闭度的影响。研究结果表明,随着林分密度和郁闭度的变化林分平均胸径和株高均发生了显著性的变化,但各试验样地的材积总量却小于对照样地。并最终确定保留木为225～300株/hm2的林分密度可以作为塞罕坝地区培育大径材华北落叶松林的最佳密度。

Management densities and site effects of largesized Larix principis-rupprechii in Saihanba

Larix principis-rupprechtii forest in Saihanba is studied as the object, by investi-gation of the test samples at different business densities （150 strains/hm^2, 225 strains/hm^2, 300 strains/hm^2 , 375 strains/hm^2 and the 750 strains/hm^2） and analysis of the effects of the same site conditions and different forest rain density on the stand DBH, tree height, board measure and crown density of Larix principis-rupprechtii forest. Research results show that, the average DBH and height of stand change significantly with the change of the stand density and canopy density, but the total volume of the test samples is smaller than that of the control. And eventually the optimum stand density is determined at 225-300 plants/hm^2, providing a scientific basis for cultivation of the big-diameter Larix principis-rupprechtii forest in Saihanha area and sustainable and healthy forest management.