径阶大小分化度的应用——以福寿国有林场为例

Application of Size Differentiation Degree of Diameter Step--A Case Study of Fushou State-Owned Forest Farm

以湖南省福寿国有林场13年生杉木生态公益林为研究对象,通过计算林分大小比数和径阶大小分化度,验证了径阶大小分化度的表达方法。以林木位置坐标数据生成Voronoi图,由此确定参照木的空间结构单元,计算林分大小比数和径阶大小分化度。利用SPSS软件对各样地大小比数和径阶大小分化度进行了回归分析,寻找能够更好表征林分空间结构的竞争指数。结果表明:相关性回归分析所得的各样地大小比数和径阶大小分化度之间平均相关系数R为0.831,相关性达显著水平,认为径阶大小分化度与大小比数有强的相关性。径阶大小分化度能够更好地反映林分竞争情况,是一种有效地描述林分空间结构的指数。

The investigated data of 13-year-old Cunninghamia lanceolata ecological public-welfare forest in Fushoushan State Forest Farm in Hunan were used to test the size differentiation of diameter class.The SPSS software was used to conduct regression analysis on the neighborhood comparison and the size differentiation of diameter class.The results showed that:the coefficient of correlation was 0.831.Correlation analysis suggested that the correlation of neighborhood comparison and the size differentiation of diameter class was up to significant level;the size differentiation of diameter class not only described accurately the size differentiation between the reference tree with neighboring trees,but also reflected the forest competition degree.It was a parameter which can be used to describe the spatial structure of forest stands.