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采用聚集指标法、幂指数法及m - x回归检验的测定,探讨了松阿扁叶蜂4龄幼虫期在林间树冠不同部位的空间分布型。结果表明,该虫在林间的整株树冠上及不同方位、不同层次上均属聚集分布。用Bliachith提出的聚集均数来测定聚集原因,当λ<2时,聚集的主要原因由环境条件引起,当λ≥2时,除受环境影响外,还与成虫的产卵行为有关。把树冠内幼虫平均数与树冠各方位、各层次的幼虫均数进行回归分析,结果是密切相关,而树冠北面下层更具代表性,可代表整株作为最适抽样部位。
Using the method of aggregation index, exponential method and m - x regression test, the spatial distribution patterns of the 4th instar larvae of the Solenopsis hystrix Bipolaris in different parts of canopy were discussed. The results showed that the insects in the forest canopy and in different directions, at different levels are clustered distribution. The reason of aggregation was determined by the means of aggregation proposed by Bliachith. When λ <2, the main cause of aggregation was caused by environmental conditions. When λ≥2, it was also related to the oviposition behavior of adults in addition to the environmental impact. The results showed that the average number of larvae within the canopy and the canopy all directions, the average number of larvae at all levels of regression analysis is closely related to the lower canopy north representative of the more representative of the entire plant can be used as the most appropriate sampling site.