西洋菜地主要害虫空间格局的地统计学分析

Geostatistical Analysis for Spatial Distribution of the Insect Pests in Watercress Field

应用地统计学方法分析了西洋菜地黄曲条跳甲Phyllotreta striolata成虫、菜粉蝶Pieris rapae及小菜蛾Plutella xylostella幼虫的空间格局,建立了多个描述东西方向上间隔距离与半方差值之间关系的曲线模型.结果表明,黄曲条跳甲成虫、菜粉蝶及小菜蛾幼虫种群空间分布具有高度异质性,其空间自相关范围分别为11.98、7.34和6.40 m,空间格局均为聚集型,变异函数曲线皆为球形.所建模型的参数块金常数占基台的比例分别为-0.0588、0.596 7和1.5363.

Geostatistical analysis was used to study the spatial distribution patterns of adults of Phyllotreta striolata Fabricius,larvae of Pieris rapae Linnaeus and Plutella xylostella Linnaeus in watercress field,and the curve models of the interval distances and semivariogram were established in the direction of west-east.The results showed that the semivariogram curve models of P.striolata,larvae of P.rapae and P.xylostella could be described by spherical models,which indicated that their spatial patterns were aggregated,and the spatial ranges were 11.98,7.34 and 6.40 m,and the varied spatial discontinuities were-0.058 8,0.596 7 and 1.536 3 respectively.