【摘要】 本文用频次分布 x~2检验法,Iwao 平均拥挤度,=α+βm,和 Taylor 冪法则,S~2-α·m~b,分析了稻纵卷叶螟幼虫空间分布型;样方大小与分布型的关系;依据单种群连续样方大小变化的-m 回归和 p-指数分析个体群占区面积;同时计算了不同密度下和不同允许误差时的抽样数,并作了序贯分析图。更多还原

【Abstract】 This paper deals with the spatial distribution pattern of rice leaf roller with the methods of frequency distribution chi square test and [wao’s mean crowding (m=a+βm)and Taylor’s power law(S~2=a·m~b). The relationship between sampling unit size and distribution pattern was ana- lysed.When 1 hill was taken as a sampling unit the distribution pattern of larvae was fitted to the contagious distribution[a=0.086,β=1.266(r=0.9738), b=1.16(r=0.996)],and when sampling unit was changed from 1 hill to 16 hills it was not changed.The area of 8-16 hill planting(planting specification was 20× 20cm)was obtained for the individual clump occupying area when m-m regression of continuous sample size change and p-index was used.1 hill recognized as sui- table sampling unit.Theoretical sampling numbers were proposed for different densities with different errors.The figure of sequential sampling analysis was made.更多还原