烟蚜在烟株上的垂直分布及其分布型

VERTICAL SPATIAL DISTRIBUTION OF TOBACCO APHIDS ( Myzus nicotianae Blackman) ON TOBACCO

在烤烟Ｋ－３２６团棵期烟株上，Ⅰ～Ⅲ龄若蚜、Ⅳ龄若蚜＋无翅成蚜在各叶位间的分布量具有显著差异，且这种差异与烟株上烟蚜Ｍｙｚｕｓｎｉｃｏｔｉａｎａｅ（Ｂｌａｃｋｍａｎ）的密度有关。对二者的７种分布型指数的计算表明，各密度下Ⅰ～Ⅲ龄若蚜、Ⅳ龄若蚜＋无翅成蚜在烟株上的垂直分布型为聚集分布；分布型指标均值的比较表明Ⅰ～Ⅲ龄若蚜的聚集强度大于Ⅳ龄若蚜＋无翅成蚜的聚集强度。用３种回归模型分别对Ⅰ～Ⅲ龄若蚜、Ⅳ龄若蚜＋无翅成蚜及无翅蚜总体进行分布型的回归分析，表明在一切密度下烟蚜的垂直分布均为聚集分布，并且聚集度对密度具有依赖性，其分布的基本成分为个体群，基本成分的空间分布型为聚集分布，烟蚜的种群密度对基本成分的相对聚集度影响很小。

The percentages of Ⅰ-Ⅲ instars and Ⅳ instar+wingless agamic females of tobacco aphid, Myzus nicotianae (Blackman), on flue cured tobacco K 326 between different leaf phyllotaxy were quite different.The difference obviously depended on the aphid density.The caculation of seven spatial pattern indices indicated that the vertical spatial distributions of the Ⅰ-Ⅲ instars and Ⅳ instar + wingless agamic females on tobacco were contagious distribution at every density.The mean value of the spatial pattern indices showed the aggregating intensity of Ⅰ-Ⅲ instars was stronger than that of the Ⅳ instar + wingless agamic females.The vertical spatial distribution ofⅠ-Ⅲ instars, Ⅳ instar + wingless agamic females and whole wingless aphids were analyzed by ways of three regression models.It demonstrated that the distributions of the tobacco aphids at any density were contagious, and the aggregating degree was density dependent.The basic component in the distribution was the individual groups and the population density had little influence on the relative aggregating degree of the basic component in the distribution.