Spatial Distribution and Sampling of Anophia leucomelas Larvaein Sweet Potato Fields
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摘要: 为了掌握烦夜蛾幼虫在甘薯田的空间分布和种群特征，2015年对不同发生密度田块进行了调查，取得8组样本资料，采用6个聚集度指标和Iwao的m*-m回归分析法、Taylor的幂法则等，对其空间分布型和田间理论抽样数进行测定和分析。结果表明：烦夜蛾幼虫在甘薯田间呈聚集分布，聚集强度随着幼虫密度的增加而增大。环境因子是导致烦夜蛾幼虫聚集分布的主要原因。在此基础上，建立了幼虫虫口密度调查的最适理论抽样数公式N=1.962/D2（1.3102/m+0.6255）和序贯抽样模型Tn=1.3102/（D2-0.6255/n）。Abstract: Spatial distribution and occurrence of Anophia leucomelas Linnaeus larvae in sweet potato fields was studied in 2015. A mathematic model for proper sampling was established using 6 gathering intensity indices,Taylor's power law, and Iwao'sm*-m regression methodolgy. The larvae appeared to have the pattern of assembling distribution in the fields. Their aggregating intensity increased with population density, and was due mainly to the environmental factors. Base on the data collected, a theoretical sampling number could be derived from the equation:N=1.962/D2(1.3102/m+0.6255), and the Kuno's model for sequential sampling:Tn=1.3102/(D2-0.6255/n).
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