【摘要】 通过7次田间调查,结果用扩散系数(S~2/x)、聚集均数(λ)、平均拥挤度(X)、负二项分布参数(K)、Iwao方程和Taylor指数的分析,晚玉米上玉米螟卵块为聚集分布。并用负二项抽样公式在D=0.2的条件下,决定理论抽样数,对单对角线、双对角线、棋盘式、“Z”形和大五点等五种抽样方法作了抽样比较。决定了序贯抽样公式。更多还原

【Abstract】 This paper deals with the spatial distribution pattern of the egg-masses of Ostrinia furncalis （ Giienee） . The egg-masses in the late maize field are the aggregation pattern. The data from seve field investigations were analyzed by dispersal rate (S² x^1/2) , mean aggregation （ λ） , index of mean crowding （（?）） parameter of megative binomial （K）, Iwao’s method and Taylor’s power law. The theoretical sampling numbers were decided, under D = 0.2, with negtive binomial sampling formula. Five sampling methods, single diagonal, double diagonal, chessboard form, zigzag form and big five points, are compared with one another, the formula of sequential sampling is established.更多还原