棉田棉蝗卵块空间分布型及抽样技术研究

The Spatial Distribution Pattern and Sampling Method of Egg Mass of Chondracris Rosea in Cotton Fields

应用Taylor幂法则、Iwao回归分析法,对棉田棉蝗卵块空间分布型及抽样技术进行了研究,并进行了影响因素分析。结果显示:其卵块空间分布格局属基本成分为个体群的聚集分布,聚集强度随种群密度的升高而增加,聚集原因是昆虫本身行为及环境因素综合影响的结果,通过Taylor指数回归式参数可以确定其在一定精确度水平下的理论抽样数。

Taylor′s power law and Iwao′s distribution function were used to analyze the spatial distribution pattern and sampling mathod of egg mass of Chondracris rosea in cotton fields. The results indicated the pattern of egg mass of Chondracris rosea in cotton fields fitted the negative binomial series. Their aggregation intensity increases with density rising. The aggregation was caused by some insect behavior and environment factors. The sampling number at fixed precision levels were determined using Taylor′s power law regression.