大尺度生态景观对麦长管蚜迁入的影响

【目的】解析不同生态景观对于麦长管蚜Sitobion avenae(Fabricius)迁飞和降落的影响,为预测预报提供科学指导。【方法】在麦长管蚜迁入期,选取了多个山脉、河流、湖泊等典型的大生态景观,抽样调查其周围麦田中麦长管蚜有翅成蚜的百株蚜量。【结果】调查显示,有翅成蚜量山的南侧比北侧多,而湖泊和河流附近的有翅成蚜量一般少于远处。山脉对麦长管蚜有翅成蚜迁入有明显阻挡作用,高海拔地区有利于有翅成蚜的迁入,孤山也对有翅成蚜迁入降落存在影响,虽然河流和湖泊对有翅成蚜的迁飞不会产生生态阻隔,但河流和湖泊景观附近不利于有翅成蚜的降落。【结论】大尺度生态景观对麦长管蚜的迁入具有明显影响,不同的生态景观类型影响程度存在差异。

Effects of the large scale ecological landscape features on the movements of Sitobion avenae （Fabricius）

Objectives] To understand how different landscapes affect the movements ofSitobion avenae （Fabricius） and to provide guidance for monitoring and predicting the occurrence of this pest. Methods] The effects of typical landscapes, including mountains, rivers and lakes, on the movements of S. avenae were investigated by conducting extensive sampling in each landscape type during the time of year when winged aphids disperse. Results Numbers of winged aphids were much fewer to the south of mountains than to the north, and near rivers or lakes. Mountains can impede the flight of winged aphids, and isolated hills can influence their landing; aphids are more likely to land at higher altitude. Although rivers and lakes cannot be a barrier to the dispersal of winged aphids, fewer winged aphids land near rivers and lakes. Conclusion] Large scale, ecological landscape features influence the movements ofS. avenae in different ways.