闽北天然闽粤栲林分空间结构研究

运用混交度、大小比数及角尺度3个林分空间结构参数对闽北天然闽粤栲种群的空间结构进行分析.结果表明:该种群的林分平均角尺度为0.606,林木的水平分布格局为聚集分布;林分大小比数平均值为0.494,各树种大小分化程度存在很大差异,闽粤栲、酸枣、拟赤杨、重阳木、麻栎、榕叶冬青及白花泡桐在胸径上具有优势,鹿角栲、皱叶荚蓬、天仙果及石楠处于劣势;林分平均混交度为0.640,树种的空间隔离程度较大,已形成由不同树种组成的呈较高混交状态的复杂群落.该林分空间结构特征与其所处生境、演替阶段、干扰和各树种生长状况、生物学特性、林分地位等有关.

On the Spatial Structure of Natural Castanopsis fissa Stand in Northern Fujian

Using the parameters of mingling degree, neighborhood comparison and uniform angle index, the spatial structure of Castanopsis fissa stand in Northern Fujian province was analyzed. The results showed that the average uniform angle index of the stand was 0. 606, it was clump distribution ; The average neighborhood comparison was 0. 494, which showed significant differences in different tree species. The DBH of C. fissa, Ziziphus jujuba var. spinosa, Alniphyllum fortunei, Bisehofia polycarpa, Quercus acutissima, Ilex ficoidea and Paulownia fortunei were higher than that of C. lamontii, Llex franchetiana, Ficus erecta and Photinia serratifolia ; The space isolation degree of tree species was high, with an average mingling degree of 0. 640, and had already formed a complex community. The features of stand spatial structure are influenced by the surrounding, stage of succession, growth status of each tree species, biological characteristics, and stand position.