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甘蔗二点螟幼虫空间分布型测定结果表明:(1)频次分布检验为负二项分布和核心分布;(2)聚集度指标测定为聚集分布;(3)m~*—m 的线性回归方程为 m~*=0.290 9+1.330 8m,属于最普通的聚集分布(负二项分布).在分布型调查和研究的基础上,文中比较了植保上常用的4种抽样方式的精度;计算了田间调查的理论抽样数,描述了 Kuno 种群序贯抽样的模型:T_=1.290 9/(D~2-0.330 8/n).
The results showed that: (1) The frequency distribution test was negative binomial distribution and core distribution; (2) Aggregation index was determined as aggregation distribution; (3) Linear regression equation of m ~ * -m Is the most common aggregated distribution (negative binomial distribution) for m ~ * = 0.290 9 + 1.330 8m.On the basis of distributed survey and research, the accuracy of the four sampling methods commonly used in plant protection is compared in this paper. The theoretical sampling number of the field survey describes the model of sequential sampling of Kuno population: T_ = 1.290 9 / (D ~ 2-0.330 8 / n).