茶小卷叶蛾幼虫空间格局及抽样技术

应用聚集度指标、Taylor的幂法则、Iwao的m*-m回归分析法,对茶小卷叶蛾幼虫空间格局进行了分析,并研究了茶小卷叶蛾幼虫在茶树上的序贯抽样技术。结果表明,茶小卷叶蛾幼虫在茶树上的空间分布属聚集分布,个体间相互吸引,分布的基本成分是个体群,其聚集性随密度的增大而增加。其聚集原因经Blackith种群聚集均数测定,当m<1.009 5时,其聚集是由外界环境条件所致;当m>1.009 5时,其聚集是由于害虫本身的群集行为与环境条件综合影响所致。在此基础上提出了最佳理论抽样数和最佳序贯抽样模型:N=1.962/D21.236 02/m+1.279 54],T0(n)=3.6 n±8.988 8 n1/2,最大样本数为n=234。

Spatial distribution pattern of Adoxophyes honmai larvae and sampling technique

In this paper,the spatial distribution pattern of Adoxophyes honmai larvae was analyzed with aggregation indexes,Taylor’s power law and Iwao’s distribution function.The results showed that the spatial distribution pattern of Adoxophyes honmai larvae belonged to aggregation with the form of colony,which means the larvae attracted each other,and the basic component of the distribution was individual colony,with the aggregation intensity increased with the density.It was tested by Blackith’s method,when m < 1.0095,the aggregation was caused by some environmental factors;when m >1.0095,the aggregation was caused by their behavior and environmental conditions.Based on this distribution pattern,a suitable sampling number(N =1.962/D2 1.23602/ m +1.27954]) and Iwao’s model(T0(n) = 3.6 n ± 8.9888 n1/2) of sequential sampling were put forward.The largest sampling number was 234.