马尾松毛虫空间格局的地学统计学分析

Geostatistic analysis of spatial pattern of Dendrolimus punctatus.

应用地学统计学方法分析了湿地松 马尾松 火炬松林中马尾松毛虫越冬代蛹、第一代卵块和低龄幼虫的空间格局 .结果表明 ,蛹在 0°、45°、90°、1 35°4个方向上的半变异函数曲线为球形 ,在 90°方向上的空间连续性大于其他方向 ;卵块和低龄幼虫的为指数形 ,在各方向上无差异 .蛹、卵块和幼虫在全方向上的半变异函数曲线均为球形 ,呈聚集型的空间格局 ,聚集强度以蛹最高 ,依次是幼虫和卵块 .分别拟合了蛹、卵块和幼虫的半变异函数模型 ,估算了样地各处的密度 。

Geostatistic analysis of the spatial patterns of the overwintering generation pupae, first generation egg masses and early stage larvae of Dendrolimus punctatus (massonpine caterpillar) in Pinus elliottiiP.massonianaP.taeda forest indicated that the semivariograms of pupae was fitted to the spherical curves at 0°,45°,90°and 135° directions, and the spatial continuity was the strongest at 90° direction. No difference was found on the semivariograms of eggs masses and larvae, which were shown as exponential curves. The semivariograms of pupae, egg masses and larvae at omnidirection were described by spherical model, indicating an aggregated spatial distribution. The strongest clumped spatial pattern was at pupae stage, and then, at larvae and egg masses stages. The semivariogram models of pupae,egg masses and larvae were simulated respectively. The isovalue maps of interpolated estimates of pupae, egg masses and larvae densities were generated by using Kriging techniques.