烟田斑须蝽空间分布型格局及抽样技术研究

【目的】探讨烟田斑须蝽(Dolycoris baccarum (L.))空间分布型格局及抽样技术，为该虫害的准确抽样调查和有效防治提供依据。【方法】选取6块烟田逐株调查，应用频次分布法、聚集度指标、Taylor幂法则以及Iwao m^*-m回归分析法，研究斑须蝽成虫在烟田的空间分布型及抽样技术。【结果】频次分布法分析表明，斑须蝽在第2块烟田的分布极显著不符合泊松分布，在第5块烟田极显著不符合奈曼分布，在第3和5块烟田均显著不符合负二项分布。聚集度指标及Taylor幂法则分析表明，该虫成虫态为聚集分布，聚集原因主要是其所生活的环境因素所致。Iwao m^*-m回归分析表明，斑须蝽个体间相互吸引，分布的基本成分是个体群，但个体群之间呈均匀分布。据此确定了不同精度下的理论抽样数及序贯抽样数，室内模拟抽样以平行线每点50株抽样的代表性最强。【结论】斑须蝽在烟田呈聚集分布，在田间种群数量调查中，宜采用平行线每点50株抽样法。

Spatial distribution pattern and sampling techniques of the sloe bug,Dolycoris baccarum (L.)

【Objective】 Study on the spatial distribution pattern and sampling techniques of the sloe bug,Dolycoris baccarum(L.) was conducted to provide a basis for accurate sampling and effective management.【Method】 Spatial distribution patterns and sampling techniques of the sloe bug D.baccarum adults in tobacco fields were studied by using frequency comparison,gather index inspection,Taylor’s power law and Iwao’s regression method.【Result】 The spatial distribution pattern of D.baccarum was very significantly unsuitable to poisson distribution in the second field and core distribution in the fifth field.Both the third and the fifth fields were significantly unfitted to negative binomial distribution.Gather indexes inspection and Taylor’s power law indicated that adults were aggregated distribution,and the population aggregation was mainly caused by environmental heterogeneity.Iwao’s regression method indicated that adults D.baccarum attracted mutually among individuals and the individual groups were the basic components.However,the individual groups were with uniform distribution.The optimal and sequential sampling numbers were determined by Iwao’s m*-m regression equation.Relative errors of 5 sampling methods including five points,chessboard,parallel lines,single diagonal,and double diagonal,were compared with each other through simulating samples indoor.The least error was found in the parallel lines method of 50 samples.【Conclusion】 Adults of D.baccarum were in aggregated distribution and the parallel lines method of 50 samples was the optimal sampling patterns.