论文部分内容阅读
应用聚集性指标mx~(1/2),s~2x~(1/2),丛生指标I,Iwaom—x回归及Taylor幂法则等,对乾县、耀县等地油菜苗期蚜虫空间分布型的系统进行了研究,结果表明,油菜苗期蚜虫空间分布呈聚集分布状态,应用Iwaom—x回归法及Southwood公共k值法求得理论抽样模式;在此基础上建立了不同防治指标下的Iwao序贯抽样表及不同精度水平下的Green序贯抽样图;结合Iwao和Green两个抽样模型,建立了Iwao-Green复序贯抽样模型,从而在某些情况下,大大地减少了抽样数并提高了精度。
The spatial distribution of aphids in rapeseed at dry county and Yao county was studied by using the aggregative indexes mx ~ (1/2), s ~ 2x ~ (1/2), cluster index I, Iwaom-x regression and Taylor’s power law The results showed that the spatial distribution of aphids in the rapeseed was aggregated and distributed, and the theoretical sampling pattern was obtained by Iwaom-x regression and the Southwood common k-value method. Based on the above results, Iwao Sequential Sampling Table and Green Sequential Sampling Map with Different Accuracy Levels. Combined with Iwao and Green two sampling models, an Iwao-Green complex sequential sampling model was established, which in some cases greatly reduced the number of samples And improve the accuracy.