冀北山地油松落叶松混交林空间结构特征研究

为探究冀北山地油松(Pinus tabuliformis)、华北落叶松(Larix principis-rupprechtii)混交林的空间结构,以木兰围场油松、华北落叶松为研究对象,通过计算林分角尺度、大小比和混交度3个空间结构指数对林分的结构特征进行分析,结果表明:油松和华北落叶松平均角尺度均在0.5左右,属于随机分布,不需要利用间伐抚育进行人工调节;大小比数均处于0.48~0.49范围,林木均为中庸木,并且林分的分化程度不明显;油松的平均混交度为0.55,呈中度混交,华北落叶松的平均混交度为0.66,呈强度混交。

Spatial Structure of Mixed Forest of Pinus tabuliformis and Larix principis-rupprechtii in Northern Hebei Province

In order to explore the spatial structure of the mixed forests of Pinus tabuliformis and Larix olgensis in the mountainous areas of northern Hebei Province,the research objects of Pinus tabuliformis and Larix principis-rupprechtii were studied,and the three spatial structure indexes of stand angle scale,size ratio and mixed degree were calculated for the stand.Result shows that the average angular scale of Pinus tabuliformis and Larix principis-rupprechtii is about 0.5,which is a random distribution and does not need to be manually adjusted by cutting and tending;the size ratios are all at the range of 0.48-0.49,and the trees are all moderate;the average degree of mixing of Pinus tabuliformis is 0.55,showing a moderate degree of mixing,and the average degree of mixing of Larix principis-rupprechtii is 0.66,showing a strong mixing.