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应用8种聚集度指标分析了淮北棉田棉蚜不同时期的空间格局,用模糊聚类分析法测定了棉蚜空间格局动态,并对其田间抽样技术进行了探讨。结果表明,棉蚜在水平和垂直空间的分布均是聚集型的。棉蚜的Kuno序贯抽样模型:三叶期T(n)=5n±11.7277,四至七叶苗蚜期T(n)=10n±17.3530,伏蚜期T(n)=100n±87.7512,n为序贯抽样数。nnn
The spatial pattern of cotton aphid in different periods of cotton aphid in Huaibei cotton field was analyzed by using eight kinds of clustering index. The spatial pattern of cotton aphid was determined by fuzzy clustering analysis and its field sampling technique was discussed. The results showed that the distribution of cotton aphid in horizontal and vertical space was aggregated. The Kuno sequential sampling model of cotton aphid showed that T (n) = 5n ± 11.7277 in the three-leaf stage, T (n) = 10n ± 17.3530 in the four-leaf stage seedling aphids and 100n ± 87.7512 in the aphid stage Sequential sampling number. nnn