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稻田蜘蛛的空间分布型,频次分布测定食虫瘤胸蛛在水稻分蘖期呈奈曼分布型也符合负二项分布型;狼蛛类群以拟环纹狼蛛和拟水狼蛛为主的是波阿松分布型;混合蜘蛛类群微蛛为主的呈奈曼和负二项分布,微蛛和狼蛛类比数相当的呈波阿松分布。这几类蜘蛛在有的田块符合二种以上的分布型,借助平均拥挤度与平均密度比值、I值、Iδ扩散指标等进行测定,确定是否属聚集型分布,反应灵敏,方法简便,应用Iwao和Taylloy法效果更佳。系统测定证实,同一块田的稻田蜘蛛各类群分布型有季节性变化,影响因素比较复杂,与其捕食对象发生情况和本身种群结构的变动有密切关系。聚集分布型多出现在水稻生育的前期。对属于聚集型分布的食虫瘤胸蛛种群进行抽样方式和抽样数量的比较测定,用棋盘式抽样较准确,平均密度每丛1头以下时,以120丛的抽样数为宜,误差率可控制在10％以内。
Spatial distribution and frequency distribution of spiders in rice field were also negative Neiman distribution in the stage of rice tillering. The main distribution of the spider and spider was the Poisson distribution; mixed Neisseria majus and negative binomial distribution of spider micro-spider, micro-spider and wolf spider analogous number was wave Poisson distribution. These types of spiders in some plots in line with two or more distribution patterns, with the average crowding ratio and the average density ratio, I value, Iδ diffusion index determination to determine whether the aggregation distribution, responsive, simple method, the application The Iwao and Taylloy methods work better. The results showed that there was a seasonal variation in the distribution patterns of spiders in the same field, and the influencing factors were more complicated, which were closely related to the occurrence of their predators and their own population structure. Aggregation distribution more in early rice growth. The sampling method and the sampling number of the predatory nematode Breitian spider population belonging to the aggregative distribution were comparatively determined. When the checkerboard sampling is more accurate, when the average density is less than one per bundle, the sampling number of 120 plexus is appropriate, and the error rate can be Control within 10%.