【摘要】 测定异色瓢虫成虫对桃蚜的捕食功能和空间异质性。结果表明:异色瓢虫成虫对桃蚜的捕食功能符合HollingⅡ模型,其244、8、72h的功能模型分别为Na24=1.021 5N/(1+0.004 06N)、Na48=1.065 0N/(1+0.003 62N)、Na72=1.037 3N/(1+0.002 12N),最大理论捕食量分别为251.892、94.124、90.20头;随着果荚数的增多,天敌对猎物搜寻过程中的环境阻力不断加大,捕食作用逐渐降低,捕食作用率同空间异质性呈现明显的线性负相关,其数学模型为y=83.833-10.100x。更多还原

【Abstract】 The predation and spatial heterogeneity on Harmonia axyridis adult to Myzus persicae were determined.The results showed that the predation of Harmonia axyridis adult belonged to HollingⅡ Model,and the functional models of 24,48 and 72 hours were Na24=1.021 5N/(1+0.004 06N),Na48=1.065 0N/(1+0.003 62N)and Na72=1.037 3N/(1+0.002 12N) separately.The maximal predation of Harmonia axyridis adult was 251.89,294.12 and 490.20 heads.With the increase of the number of the gains,the environmental resistance increased when the natural enemy was hunting for the preys,and the predation efficiency was low when the spatial heterogeneity was complex.It displayed obvious linear negative relationship between the predation rate and the spatial heterogeneity,and the mathematical model was y=83.833-10.100x.更多还原