不同松林马尾松毛虫蛹及其寄生天敌群子的空间格局分析

应用地学统计学的原理和方法研究了３种松柯马尾松毛虫越冬工蛹及其寄生天敌群子的窨结构和空间相关性。结果表明，湿地松－马尾松－火炬松混交松林中蛹的半变异函数曲线为球形，其空间格局为聚集型，受害程度高的马尾松纯林中，蛹的半变异函数曲线为指数形，空间格局为聚集型，受害程度低的纯马尾松林中，蛹的半变异函数曲线是一条截距为０．４２３，斜率为０．００３８１４的直线，表明为随机或均匀型的空间格局。３种松林中蛹的寄

SPATIAL DISTRIBUTION OF MASSON PINE CATERPI LLAR PUPAE ANDITS PARASITIC NATURAL ENEMY GUILDS FOR THE OVERWINTERING GENERATION IN THE DIFFERENTPINE FORESTS

Studies on the spatial construction and distribution of masson pine caterpillar (Dendrolimus punctatus (Walker)) pupae and its parasitic natural enemy guilds for the overwintering generation in three pine forests (i.e., the pure masson pine stands of high and the low damage level, and the Pinus elliottii P.massoniana P.taeda mixed pine forest) were carried out using geostatistics. The results of analysis reveal spatial distributions of pupae and its parasitic natural enemy guilds semivariograms. The semivariogram of pupae was described by spherical model in the mixed pine forest, indicating an aggregated spatial arrangement. In the pure masson pine stands of high damage, semivariogram of pupae was fitted by an exponential model, also indicating an aggregated spatial arrangement. In the low damage stands. semivariogram was linear with 0.423 intercept and a very low slope (0.003814), indicating random or uniform spatial pattern. The semivariograms of parasitic natural emenies guilds in three pine forests were linear with little slope, showing random or uniform distribution. The results and methods are applicable to the temporal and spatial dynamics of insect population and the insect pest ecological control.