竹笋禾夜蛾幼虫空间分布型及抽样技术

运用比较频次法检验结果，竹笋禾夜蛾幼虫空间分布型属于Ｎｅｙｍａｎ分布；聚集度指标测定结果表明，幼虫分布型是聚集分布；根据ｍ＊～ｘ的回归关系，可得线性回归方程ｍ＊＝－０．０６６＋１．６７８ｘ，属于聚集分布．五种抽样方法精度比较，平行线取样法最好，适用于林间调查．并计算了林间调查的理论抽样数，列出了序贯抽样分析表．

A Study of the Spatial Distribution of Larvae of Oligia Vulgaris and of lts Sampling Method

In this paper spatial distribution pattern for larvae of Oligig vulgaris was studied by means of both frequency distribution and index of aggregation,with the results showing the following aspecte: 1,Distribution pattern of the larvae,obtained by Chi-square test of frequency distribution,obeys Nepoan distribution;2,The spatial distribution pattern,which is obtained by the index of aggrega tion,obeys aggregative distribution;and 3,The regression equation between m*=and x is m*=-0.066+1. 678 and the distribution of larvae is aggregative distribution. And different sampling techniques are compared,with the result showing that the method of parallel line is the best land theoretical sampling number of forest survey is analysed and calculated;and the sequential sampling analysis is also presented.