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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。
The spatial structure characteristics of Pinus tabulaeformis plantation in Beijing Badaling Forest Farm were analyzed by using the traditional stand structure factor with the parameters of mixing degree, size ratio and angle scale. The results showed that the species composition of this tree species was Pinus tabulaeformis 1 and Yamanashi + Tamarix, the stand density was 1 325 plants / hm2. The average angular dimension of stands was 0.478, and the spatial distribution pattern of stands was randomly distributed. The average degree of hybridization was 0.433, with moderate hybrids among different species, with less interspecific segregation. The mean diameter at breast height (DBH) was 0.389, and the mean tree size was 0.464, which indicated that the number of dominant trees was more, the stand differentiation was obvious, and the development space of the stands was still large. The ratio of DBH to the number of trees and the height of the tree height have strong consistency in reflecting the growth superiority between the reference trees and the adjacent trees of each species.