【摘要】 本文运用扩散型指标法测定了建宁杉奕刺蛾 (Phlossa jianningana Yang et Jiang)蛹在杉木林间的空间分布型。研究结果表明 ,其分布型为聚集分布 ,其分布的基本成分是个体群。根据 Iwao线性回归关系 ,可得线性回归方程 m* =0 .3935+ 1.4 0 2 x,属于聚集分布。运用 Iwao的理论抽样数公式参数计算出了在一定精度水平下的理论抽样数 ,并列出了序抽样分析表。更多还原

【Abstract】 The spatial distribution pattern for pupae of Phlossa jianningana Yang et Jiang were measured by methods of indices of aggregation.The result showed that the spatial distribution pattern of pupae obeyed aggregate pattern in Chinese fir,and the basic component of spatial distribution pattern was loose colony.By Iwao’s methods the optimal sampling number of forest survey was analysed and calculated,and the sequential sampling analysis was also presented.更多还原