白背飞虱低龄若虫空间分布参数的特征及应用

The Characteristics and Applications of The Distribution Pattern Parameters of Low Instar Nymph of Sogatella Furcifera in Rice Fields

根据Taylor的幂法则和Iwao的m~*—回归方程(m=α+β)测定结果,白背飞虱1—3龄若虫的空间分布型为负二项分布,其公共k值为3.0135。本研究运用分布型参数K、α和β,分析了白背飞虱若虫在田间聚集分布的原因及其平均密度与K值的关系;探讨了用零频率来估计其平均密度,并分别给出了不同零频率及不同平均密度下所需的理论抽样数。

According to the testing results by Taylor' s power law and Iwao' s m* -x regression equation (m*=a+βx), the spatial pattern of 1 ?3 instar nymph of white -backed rice planthopper (Sogatella furcifera) belonged to the negative binomial distribution with a common K value of 3. 013 5. Reasons for the aggregated distribution of nymph of S. furcifera in rice fields, and the relationship between mean density and negative binomial K value were analyzed with the distribution pattern parameters (K, α, and β). The zero frequency estimation for mean density of S. furcifera was also studied. And the theoretical number for sampling at different zero frequencies and different mean densities was offered.