带状间伐对长白落叶松人工纯林诱导复层林效果评价

Effect of Different Ribbon Thinning on Inducing Artificial Multi-storied Forest Process of Larix olgensis Pure Plantations

以辽东山区人工长白落叶松(Larix olgensis Henry)幼龄林、中龄林和近熟林为研究对象,进行两种方式的带状间伐:Ⅰ型,隔2行伐2行;Ⅱ型,隔3行伐3行。研究带状间伐对长白落叶松保留木与更新幼树生长变化、灌木与草本多样性及土壤有机碳的影响。试验结果表明:带状间伐3 a后,间伐带内长白落叶松保留木的平均胸径、平均单株材积显著高于未间伐林分,Ⅱ型好于Ⅰ型;间伐对平均每公顷蓄积的影响相对较小,间伐3 a内材积生长量变化为Ⅱ型>Ⅰ型>对照区。林内灌木、草本层的生物多样性显著提高,间伐类型效果为Ⅱ型>Ⅰ型;各类型更新幼树的平均树高、平均地径、平均冠幅及更新幼树生物量均表现为Ⅱ型林分>Ⅰ型林分,带状间伐后更新幼树生物量的增长率为地下部分>地上部分;各类型林分各土层土壤有机碳质量分数依次为Ⅱ型林分>Ⅰ型林分>对照区林分。

An experiment was conducted to study the influence of young forest, middled-aged forest and near-mature forest of ar- tificial Larix olgensis in eastern Liaoning Province under two strip thinning： Type Ⅰ （reserving 2 lines and cutting 2 lines） and Type Ⅱ （ reserving 3 lines and cutting 3 lines）. The effects of the different thinning of Larix olgensis and replacement saplings growth, plant diversity of undergrowth vegetation on soil organic carbon content were conducted with on five pieces of artificial larch pure forest inducing multi-storied forest experiment. Among different thinnings, the average DBH and av- erage individual volume of larch reserved trees were significantly higher than the check plots, and Type Ⅱ is better than Type Ⅰ. There is relatively little influence on average volume. The volume growth results of thinning in three years show that ： Type Ⅱ 〉 Type Ⅰ 〉 check plot through ribbon thinning. The species and quantity of undergrowth vegetation gradually increase, and Type Ⅱ is better than Type Ⅰ. The average height, average diameter, average crown breadth and biomass of each replacement saplings show that： Type Ⅱ 〉 Type Ⅰ. The replacement saplings biomass growth shows that： the ground part 〉 the underground part. The soil organic carbon content order of each type are Type Ⅱ 〉 Type Ⅰ 〉 check plot.