杉木立木干基腐朽病空间分布型的研究

本文用聚集度指标测定了杉木立木干基腐朽病的空间分布型．共调查标准地８块，用样园法调查６个伐区，其各项聚集度指标都说明杉木立木干基腐朽病属于随机分布．在ＩｗａｏＭ＊－Ｘ的回归基础上，对回归模型进行随机分布的偏离度检验，两种调查法的差异不显著，空间分布型呈随机分布．并估算了立木干基腐朽病的最适抽样数

A Study on Spatial Distribution Patterns of Decadent Disease of Chinese Fir

In this paper, the spatial distribution patterns of decadent disease of Chinese fir were measured by aggregated indices from eight plots and six sample circles in cutting area All aggregated indices meant that the spatial distribution patterns of decadent disease of Chinese fir were random distribution According to Iwao's (M *-X ) regression equation, the F test was used to test the deviation range for Iwao model, the results showed that two investigated methods both were not significant, the spatial distribution were random distribution At last, the theoretical sampling area of forest survey was analyzed and calculated under different density