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根据田间调查结果分析,在烤烟旺长期,烟蚜在烤烟地的空间格局呈聚集分布,用双行平行跳跃法等4种取样法抽样比较,以双行平行跳跃法与总体实测数相差最小。烟蚜在烟株上的垂直分布存在着明显的层次性,主要分布在倒1—12层叶层上。应用Iwao根据m~*-m关系提出的两阶抽样模型估计,在给定D=0.10、0.15、0.20精确水平时,每株查倒1—12叶层蚜量所需抽查的烟株数的平均值分别为106、47、27株。当取95％置信度时,区间估计上、中层:P_上[0.9504,0.9556] P_上=0.953,下层:P_下[0.0444,0.0496] P_下=0.047。在烤烟旺长期,蚜量的田间抽样估计可采用双行平行跳跃法,每块取30株烤烟,查倒1—12层叶层上的蚜量,即可满足0.15—0.20的精确度要求。
According to the field survey results, the spatial pattern of tobacco aphid in the flue-cured tobacco was aggregated and distributed in the long-term tobacco growing period. Sampling was performed by four sampling methods such as double-row parallel hopping method. The difference between the two-row parallel hopping method and the overall measured data was the smallest. The vertical distribution of tobacco aphid in tobacco plants there is a clear hierarchy, mainly in the inverted layer 1-12 leaf layer. Applying Iwao’s two-stage sampling model based on the m ~ * -m relationship, we estimate that at a given level of D = 0.10, 0.15 and 0.20, Values were 106,47,27 strains. When 95% confidence is taken, the interval estimates are upper and middle: P_up [0.9504,0.9556] P_up = 0.953 and the lower: P_down [0.0444,0.0496] P_down = 0.047. In the flue-cured tobacco Mongolian long-term, aphid amount of field sampling can be estimated by double-row parallel jump method, each take 30 flue-cured tobacco, check the amount of aphids on the 1-12 layer, you can meet the accuracy requirements of 0.15-0.20.