冀北山地落叶松与白桦人工林混交效果调研

Investigation on the mixed model of artificial forestation of larch and Betula platyphylla in the Mountainous Area of Northern Hebei Province

在围场接坝山地阴坡、半阴坡地带,选择18a生人工落叶松与白桦混交林进行生长状态研究。结果表明:在混交林内白桦的胸径生长仅次于落叶松,而白桦的高生长要高于落叶松;在5种带状混交模式中,单行(行间)或双行混交效果最差,而6行落叶松4行白桦混交模式是最优模式,该种混交林每公顷林木蓄积量和林价均较高,且林分稳定。落叶松与白桦带状混交适用于冀北山地类似地带造林,适宜在部分落叶松采伐迹地更新造林中推广应用。

In the shady slope and semi-shady slope of Weichang-Jieba Mountain,the mixed forest of 18-yearold Artificial Larch and Betula platyphylla was selected to study the growth state.The results showed that the DBH(diameter at breast height)growth of Betula platyphylla in the mixed forest was second only to that of Artificial Larch,while the height growth of Betula platyphylla was higher than that of Artificial Larch;Among the five banded mixed models,single row(inter row)or double row mixed model had the worst effect,while6-Row Larch and 4-row Betula platyphylla mixed model was the best model.This kind of mixed forest has relatively high stock volume and forest price per hectare,and the forest stand is stable.The banded mixed forest of Artificial Larch and Betula platyphylla is suitable for afforestation in similar mountainous areas of North Hebei Province,and it is suitable for reforestation in some larch cutting sites.