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用罩笼方法测定了七星瓢虫成虫捕食棉蚜的功能反应。瓢虫一日捕蚜量(Na)用蚜虫日增长倍数(R)与初始蚜量之乘积减去剩余蚜量求得。瓢虫捕食蚜量的功能反应曲线符合 Holling—Ⅱ型,(a′=0.77;Th=0.00259)。测定了瓢虫干扰常数(m)和寻找常数(Q),(m=0.6284;Q=0.487)。根据功能反应曲线推论,当棉蚜与瓢虫共存于一个封闭系统内时,棉蚜的种群动态模型为N_((t+1))=RN_((t))exp((-0.77P)/(1+0.77×0.00259N_((t)))当 R 与 P 取定值时,N_((t))对 N_((t+1))的上升或下降起决定性作用。
The functional response of adult ladybugs of Coccinella septempunctata to cotton aphid was determined by cage method. The amount of aphid caught on a day of ladybug (Na) is calculated by multiplying the daily aphid multiplication factor (R) by the initial aphid amount minus the remaining aphid amount. The functional response curves of ladybugs to hatching aphids conform to Holling-Ⅱ type (a ’= 0.77; Th = 0.00259). The ladybug interference constant (m) and the finding constant (Q) were determined (m = 0.6284; Q = 0.487). According to the functional response curve, when the cotton aphid and ladybug coexist in a closed system, the population dynamics model of cotton aphid is N _ ((t + 1)) = RN _ ((t)) exp (1 + 0.77 × 0.00259N _ ((t))) N_ ((t)) is the decisive factor for the rise or fall of N _ ((t + 1)) when R and P take on a fixed value.