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探讨稻飞虱迁入初期成虫空间分布格局和抽样技术,为该害虫的准确抽样调查和有效防治提供依据。选取11块稻田逐丛调查资料,应用聚集度指标法、Iwao法和Talyor幂法则,研究了广东西南部稻飞虱迁入初期成虫空间分布格局和抽样技术。结果表明,稻飞虱迁入初期成虫在田间分布呈聚集分布为主,其聚集强度随虫口密度增加而增强。m-m回归分析表明,稻飞虱成虫个体间相互排斥,分布的基本成分是个体群。Taylor幂法则分析表明,稻飞虱成虫个体的空间格局随着种群密度的提高越趋聚集分布。在此基础上提出了理论抽样数和序贯抽样模型:n=(1.96/D)2(0.965 1/x+0.619 7)和T n=0.965 1/(D02-0.619 7/n)。
To explore the spatial distribution pattern and sampling technique of adult planthoppers during the initial stage of planthopper migration, provide a basis for accurate sampling investigation and effective prevention and control of the pest. Eleven rice fields were screened each by cluster, and the spatial distribution pattern and sampling technique of adult planthoppers in the early stage of migration of planthoppers in southwestern Guangdong were studied by means of aggregation index, Iwao method and Talyor power law. The results showed that in the initial stage of planthopper migrating, planthoppers distributed mainly in the field, and their aggregation intensity increased with the increase of population density. m-m regression analysis showed that individuals of planthoppers repel each other, the basic component of the distribution of individual groups. Taylor power law analysis showed that the spatial pattern of individuals of planthoppers became more and more concentrated with the population density increasing. On this basis, theoretical sampling number and sequential sampling model are proposed: n = (1.96 / D) 2 (0.965 1 / x + 0.619 7) and T n = 0.965 1 / (D02-0.619 7 / n).