非稻田生境褐飞虱卵寄生蜂群落动态

对稻田周围田埂和路边上能寄生褐飞虱的卵寄生蜂群落的动态进行了初步研究。研究结果表明：冬季休耕期，卵寄生蜂群落变化趋势为先降后升；夏季休耕期，因为水稻收割，部分寄生蜂迁移到田埂和路边，卵寄生蜂数量呈直线上升趋势；早稻生长期，田埂和路边的飞虱卵寄生蜂的数量变化同稻田褐飞虱卵寄生蜂和褐飞虱呈正相关的关系；晚稻移栽后，田埂和路边上飞虱卵寄生蜂数量下降，以后在一定的范围内波动，晚稻后期，数量急剧上升随后很快下降，害虫防治史影响着稻田周围生境中8飞虱卵寄生蜂群落，综防区试验田周围生境中飞虱卵寄生蜂群落的寄生蜂数量、物种丰富度、多样性指数和均匀性指数均优于非综防区。

Dynamics of brown planthopper egg-parasitoid community in non-rice habitats

The community dynamics of egg parasitoids that could parasitize the brown planthopper in non rice habitats such as bunds and roadside vegetation were studied. They were found to fluctuate quantitatively dropping and rising during overwintering, and affected by rice harvesting during the fallow after the first season rice. The dynamics of the communities were positively related to the number of the hopper egg parasitoids and rice planthopper in rice field during the first season rice growth period. The number of the communities decreased after the second season rice transplanted,then fluctuated within a certain range,increased then fell down greatly before harvesting. The communities were also found to be affected by the strategy of pest control during both fallow and rice growing period. The number of parasitoids, the species richness, the community diversity and the evenness indices of the communities from IPM rice field were always superior to those communities from non IPM rice field.