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用5种聚集度指标对南疆林果有害生物主要天敌孪斑唇瓢虫(Chilocorus geminus Zaslavskij)卵块的空间分布状况进行调查与分析。结果表明:该虫卵块的空间分布符合负二项分布,其空间图式是聚集的,卵块之间相互排斥;最适抽样数N与平均卵密度m及允许误差D的关系为N=(1/D)2[(-0.208/m)+1.704]。
The spatial distribution characteristics of the eggs of Chilocorus geminus Zaslavskij, a major natural enemy of the pests of southern forest pests, were investigated with five kinds of aggregations. The results showed that: the spatial distribution of the egg mass conformed to the negative binomial distribution, the spatial pattern was aggregated, and the egg masses were mutually exclusive. The relationship between the optimal sampling number N and the average egg density m and the allowable error D was N = ( 1 / D) 2 [(- 0.208 / m) +1.704].