烟田烟蓟马种群空间分布型及序贯抽样技术的研究

采用聚块性指标和Iwao回归法等,研究了烟田烟蓟马种群空间分布型,结果表明其符合聚集型的负二项分布,且具有共同的K值(K=3.11653)。在此基础上建立了不同精度水平下的Kuno序贯抽样图、不同防治指标下的Iwao序贯抽样图及复序贯抽样图。3种序贯抽样中,以复序贯抽样为优。

Studies on Spatial Distribution and Sequential Sampling for Population of Thrips Thrips tabaci Lindeman in Tobacco Fields

In the present paper, the spatial distribution patterns of tobacco thrips(r/irz_/JS tabaci Lindeman) in tobacco fields were studied using aggregation index and Iwao's method of regression of mean crowding on mean density. All the indices indicated that the spatial distribution patterns for Thrips tabaci Lindeman in the tobacco fields were concordant with negative binomail distribution with a common K(K = 3.116 53) and of the aggregation. On the basis of these results a diagram of Kuno's sequential sampling for various accuracies, a diagram of Iwao'sequential sampling for various control standards and two diagrams of compound sequential sampling were worked out. Among the three sequential samplings, the compound sequential sampling was the best.