Spatial Distribution and Sampling Technique for Aphis glycines Matsumura
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The spatial distribution of Aphis glycines Matsumura was studied. All sets of samples exhibited aggregated patterns of spatial distribution, but did not fit Poisson, Neymann (n=0?4 and ?), Poisson-binomial and compound Poisson distributions. Of 11 sets of samples tested, 10 sets fitted the negative binomial distribution; only 1 set did not fit. The fundamental components of the spatial distributions of Aphis glycines are aggregated distribution of individual populations; the degrees of aggregation increase with the population densities. The spatial distribution parameters ( ? m , C? , ? I , x m ? ,?,? ) of the soybean aphids and species aggregation average degree ( ? ) were analyzed, the reason of aggregation patterns of the aphids was discussed, and the relation between the average sizes of the individual population and its average densities was predicted. The theoretical sizes of sampling and sequential sampling plans of fixed levels with precision were determined by utilizing estimated variance/mean relationship obtained from Taylor’s power law regression. The theoretical size of sampling is 2 0.64 5.364 D x n ? ? and the stop line of fixed-precision-level sequential sampling is 3.125 0.563 * 13.8 D n T n ? .
Originating text in Chinese.
Citation: Su, Jianya, Hao, Kangshan, Shi, Xiaoling. (1996). Spatial Distribution and Sampling Technique for Aphis glycines Matsumura. Journal of Nanjing Agricultural University, 19(3), 55-58.
Originating text in Chinese.
Citation: Su, Jianya, Hao, Kangshan, Shi, Xiaoling. (1996). Spatial Distribution and Sampling Technique for Aphis glycines Matsumura. Journal of Nanjing Agricultural University, 19(3), 55-58.
Keywords
Aphis glycines Matsumura, Spatial distribution, Sampling
