摘要
经6块甜菜田的聚集度指标测定结果表明,草地螟幼虫在甜菜田属聚集分布。经Iwao回归拟合,(,P<0.01),式中的组合说明草地螟幼虫在田间的分布属聚集分布中的奈曼分布,结果和聚集度指标测定结果相吻合。4种取样方法与抽样总体比较,以双对角线抽样法误差最小,代表性好,宜在大田调查时采用。草地螟幼虫不同虫口密度所需最大抽样量由:给出。
The results from 6 beet fields showed that Loxostege sticticalis larvae in the beet field were a clumped distribution. The error of double diagonal method in comparison with the other 4 sampling methods was minimum and representative, and it is suitable for field investigation. The sampling number of Loxostege sticticalis larvae population density, n=32.6525√x-0.2925.
出处
《中国糖料》
2012年第4期33-34,36,共3页
Sugar Crops of China
关键词
甜菜
分布型指数
抽样技术
草地螟幼虫
预测预报
beet
distribution type index
sampling technique
Loxostege sticticalis larvae
forcast
