甜菜象虫幼虫田间分布型及抽样研究

Field distribution pattern of beet weevil larva and its sampling technique

应用Iwao法、Taylor法和其他5种聚集度指标分析了甘肃河西地区甜菜象虫幼虫混合种群在田间的分布型,结果表明甜菜象虫幼虫在田间属聚集分布。分布的基本成分是个体群,且基本成分的相对聚集度随种群密度的上升而增大。根据Iwao法建立了理论抽样数的计算公式。

Iwao's law, Taylor's law and 5 kinds of gathering quotas were applied to analyze the distribution patterns of mixed populations of beet weevil larva, which belong to the genus Bothynoderus Schoenherr, in the field of the Hexi corridor, in Gansu Province. The results indicated that the distribution of the beet weevil larva population in field is aggregated. The basic composition of distribution is the individual crowd, and the degree of gathering of basic composition will become larger while the population density enlarges. Finally, the calculation formula of theory sampling number were built on the basis of Iwao's law.