菠萝蜜园黄翅绢野螟幼虫的空间分布格局和抽样技术

Spatial Distribution Pattern and Sampling Plan of Diaphania caesalis Larvae in Artocarpus heterophyllus Plantation

采用Iwao直线回归方程和Taylor幂法则结合聚块性指标m^*/m、丛生指标I和Cassie指标CA三种聚集度指标对菠萝蜜园黄翅绢野螟幼虫进行空间分布格局和抽样技术分析。结果表明,菠萝蜜园黄翅绢野螟幼虫的空间分布型为聚集分布或均匀分布。在此基础上,建立了菠萝蜜园黄翅绢野螟幼虫的最适理论抽样公式n=t^2/D^2(0.949/m+0.502)和最佳序贯抽样模型T(n)=nm0±1.96√n(0.949m0+0.502m^20)。

Spatial distribution patterns and sampling plans ofDiaphania caesalis larvae in Artocarpus heterophyllus plantation were analyzed by using Iwao’s linear regression equation and Taylor’s power law combined with Contag index m^*/m,Moore index I and Cassie index CA.The results showed that the D.caesalis larvae in the A.heterophyllus plantation were aggregated or evenly distributed in a spatial distribution pattern.On this basis,the optimum theoretical sampling formula of D.caesalis larvae in the A.heterophyllus plantation was established as n=t^2/D^2(0.949/m+0.502),and the optimum sequential sampling model was T(n)=nm0±1.96√n(0.949 m0+0.502 m^20).