北京八达岭油松人工林结构分析

用传统林分结构因子配合混交度、大小比、角尺度3参数来分析北京八达岭林场油松人工林空间结构特征.结果表明:该林分的树种组成式为8油松1槲树1山梨 暴马丁香,林分密度为1 325 株/hm2.林分的平均角尺度为0.478,林分立木空间分布格局为随机分布.平均混交度为0.433,不同树种间呈现中度混交,种间隔离程度较小.林分平均胸径大小比为0.389,平均树高大小比为0.464,说明处于优势地位的株数较多,林分分化明显,且林分的发展空间还很大.胸径大小比数和树高大小比数在反映各树种参照树与相邻木之间的生长优势方面具有较强的一致性.

Study on the Structure of Artificial Pinus Tabulaeformis Stand

The spatial structure of the Pinus tabulaeformis stand were studied by combining the traditional stand structure indexes with the three spatial structure indexes of mingling,neighborhood pattern and neighborhood comparison in Badaling mountain area of Beijing.The results showed that the tree species composition in the stand was 8 Pinus tabulaeformis plus 1 Quercus dentate plus 1 Pyrus betulaefolia Bunge plus Syringa reticulate(Bl.) Hara var.mandshurica(Maxim.) Hara(S.amurensis Rupr.),the stand density was 1 325 trees per hm2.The neighborhood pattern of the stand was 0.478,indicating that tree position in this stand was random distribution.The average mingling in the stand was 0.433,showing that the stand had a moderate mixed degree.The average neighborhood comparison of DBH and tree height in this stand was 0.389 and 0.464,respectively,which showed that the number of dominate tree was greater than the others.And the average neighborhood comparison of DBH and tree height was in great consistent in reflecting the growth advantage between reference trees and adjacent trees.