苹果园芬兰真绥螨种群的空间动态分析

应用5种聚集度指标和Iwao法分析了芬兰真绥螨在苹果树冠的发生动态和空间格局.结果表明:叶螨和镰螯螨是芬兰真绥螨的主要猎物,7月中旬到8月中旬为其种群发生高峰期,种群数量主要随着镰螯螨数量增加而增加;树冠上层、北面和内膛,芬兰真绥螨种群个体间相互排斥;在树冠中层、下层、东面、南面和西面,芬兰真绥螨种群个体间相互吸引,分布的个体成分是个体群;在树冠垂直方向和水平方向上芬兰真绥螨种群均呈现聚集分布;从7月到10月,芬兰真绥螨种群表现低聚集度,10月1日到10月中旬聚集度有增长的趋势.

Spatial dynamics of Euseius finlandicus population in apple garden

The time-series dynamics and spatial pattern of E.finlandicus were analyzed by calculating five indices of aggregation,and parameters of Iwao model.The results showed that Tetranychidae and Tydeidae were main prey to E.finlandicus.Peak periods was middle ten days of July to the middle ten days of August,and population was increased with the increasing of T.californicus.The population repelled each other in the upper,north and inner crown of apple trees.The population attracted each other and distributed with basic component of individual colony in the middle,lower,east,south and west crown of apple trees.The spatial pattern of E.finlandicus in apple garden belonged to an aggregated distribution pattern.Its aggregation intensity decreased from July to October,and then gradually increased from October 1st to the middle ten days of October.