冬枣枣尺蛾卵块空间格局的地统计学分析

Geostatistical Analysis on the spatial pattern of Chihuo zao Yang egg pods in Dongzao jujube trees

运用地统计学方法,分析冬枣枣尺蛾卵块空间格局,建立了南北和东西两个方向上的半变异函数曲线模型。结果表明,枣尺蛾卵块在南北方向上的半变异函数为球形—指数套合模型,东西方向上为指数模型,在调查范围内其空间格局为聚集型;枣尺蛾卵块在南北方向和东西方向的变程分别为40.8327m和11.2301m;在南北方向和东西方向上,其自相关性和结构特征引起的种群变异为90.55%和13.91%,表明前者具有很强的空间相关性。利用Kriging插值法生成的等值线图清晰反映了卵块的空间位置,进一步表明枣尺蛾卵块呈聚集分布。

Geostatistical method was used to analyze spatial pattern of Chihuo zao egg pods in Dongzao jujube trees and semivariogram curve model in the direction of North-South and West-East was established. The results showed that semivariogram of egg pods in the direction of North-South was sphere-index model and semivariogram in the direction of West-East was index model. Spatial pattern in the investigated areas was aggregated model. The correlation distance of egg pods in the direction of North-South and West-East were 40.832 7 m and 11.230 1 m respectively and morphological variations induced by autocorrelation and structure characteristics were 90.55% and 13.91% respectively, indicating that there was strong spatial correlation existed in the direction of North-South. Isoline map based on Kringing interpolation method clearly reflected the spatial position of egg pods, indicating again aggregated distribution of egg pods.