在30℃、75%RH条件下研究玉米象Sitophilus zeamais与谷蠹Rhizopertha dom inica的种间竞争,并采用Votka-Volterra种间竞争模型进行拟合,结果表明玉米象与谷蠹单独饲养时的种群数量均明显高于混合饲养时的种群数量,2物种之间存在着明显的种间竞争关系,属于资源利用型竞争;单独饲养和混合饲养下玉米象的种群数量均大于谷蠹的种群数量;混合饲养条件下,2个物种处于一种不稳定的平衡状态,谁取胜取决于2个物种的初始状态对谁更有利,在这个竞争系统中,玉米象为优势种。
The effects of interspecific competition on the population dynamics of four insect grain Insecp pests （ Sitophilus zeamais, Rhizopertha dominica, Tribolium castaneum and Cryptolestes ferrugineus ） was studied at 30℃, 75% relative humidity. A regression analysis of the population dynamics was conducted. The results showed that population growth of S. zeamais , R. dominica, T. castaneum and C. ferrugineus was restrained under mixed rearing. Population growth of T. castaneum and C. ferrugineus was remarkably accelerated when they coexisted with S. zeamais or R. dominica, while that of S. zeamais and R. dominica was restrained to some extent. Regression analysis results showed that the population growth potential of S. zeamais was the largest and that of C. ferrugineus was the smallest, and the changing trends of population growth rates were not distinct.
