褐边绿刺蛾越冬茧的空间格局与抽样技术研究

Study on spatial distribution and sampling technique of hibernating cocoon of Parasa consocia

采用扩散型指标法和Iwao、Taylor回归法测定了上海地区褐边绿刺蛾Parasa consocia越冬茧的空间分布型。结果表明,褐边绿刺蛾茧在一切密度下空间分布型均为聚集型的负二项分布,且聚集强度随密度增加而增强,个体间相互吸引,分布的基本成分为个体群。根据空间分布型的参数,确定了理论抽样数和Kuno序贯抽样方法,提高了调查抽样的效率。

This paper studied the spatial distribution pattern of hibernating cocoon of Parasa consocia on different plants in Shanghai by Iwao method, Taylor method models as well as some indices of aggregation （ C, M ^＊ , M ^＊/x, I, K, CA, I8）. All indices indicated that its distribution was a negative binominal distribution of an aggregated pattern in all densities. Aggregation intensity of of Parasa consocia increased with increasing densities. The theoretical sampling number and Kuno＇ s sequential sampling method were ascertained by the parameter of spatial distribution pattern.