小菜蛾幼虫空间格局的地统计学分析

应用地统计学方法分析了小菜蛾Plutellaxylostella (L .)幼虫空间格局 ,建立了东西和南北 2个方向上多个半变异函数曲线模型。结果表明 ,在菜花 (Brassicaolenaceavar.botrylis)和早甘蓝 (Brassisaoleracea)地中小菜蛾幼虫种群的半变异函数曲线皆为球形 ,其空间格局为聚集型 ;小菜蛾幼虫在菜花上和在早甘蓝上的空间变程分别为 0 62～ 1 5 9m和 2 47～ 5 98m ,空间不连续性强度分别为 0 8779～0 9999和 0 862 1～ 0 91 2 4。

Geostatistical analysis on spatial patterns of Plutella xylostella larvae

Geostatistical methods were applied to study the spatial patterns of Plutella xylostella L. larvae in the field,and semivariogram curve models were established in two directions of north|south and west|east.The results showed that the semivariogram of P. xylostella larvae could be described by spherical models in the cauliflower field and early cabbage field,which indicated that their spatial patterns were aggregated.The spatial range of larvae of this species varied from 0.65～1 59 m and 2.47～5 98 m,and spatial discontinuity varied from 0 8779～0 9999 and 0 8621～0 9142,in the cauliflower field and early cabbage field respectively.