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1979年7月20—22日、8月10—12日、9月10—12日分别从9、8、5块大豆田,应用分层随机抽样法进行豆秆黑潜蝇田间分布型调查。按豆田大小分別规划出各包括5至16个小区的区组。区组面积为20×100M 至100×100M。每小区面积为25×25M(个别田的小区为20×20M)。在每小区内随机抽样4点,每点两排,每排5株。每区组抽样320株(8×40) 至640株(16×40)(个别田为5×40株)。将豆株携回室内进行剥查。所获资料应用电子计算器(Casio fx—140)进行频次分布适合性测定。7月代的低密度虫口符合潘松分布,而8月、9月高密度虫口符合负二项分布与核心分布。样点含量大小以及豆株不同部位的虫口数影响样本的分布。一些扩散型指数(如 Ca、I、L)以及平均拥挤度与平均数的回归关系在本文中应用并加以讨论。
July 19-22, 1979, August 10-12, September 10-12, respectively, from 9,8,5 soybean fields, stratified random sampling method for the investigation of the distribution of Stem black-shelled flies. According to the size of the soybean field, each area group consisting of 5 to 16 cells is planned separately. Block area of 20 × 100M to 100 × 100M. Each cell area of 25 × 25M (individual fields of the district for the 20 × 20M). Random sampling in each district 4 points, each two rows, each row of five. There were 320 (8 × 40) to 640 (16 × 40) samples per district (5 × 40 individuals). Peas back to the room for stripping. The data obtained using the electronic calculator (Casio fx-140) for frequency distribution fitness test. The low density insects in July and July met the Pandong distribution, while the high density insects in August and September met the negative binomial distribution and core distribution. The sample size and the number of insects in different parts of soybean plant affected the distribution of samples. The regression of some diffusive indices (eg, Ca, I, L) and average crowding to the mean are discussed and discussed in this paper.