主要储粮昆虫在模拟条件下的种群动态研究

Studies on Population Dynamics of Main Stored Grain Insects Under Simulated Conditions.

本试验利用铁皮仓桶模拟粮堆实际情况,分别对小麦中的玉米象、谷蠹、杂拟谷盗的单一种群以及混合种群的种群动态、种间竞争进行了研究,并建立了相应的模拟模型。结果表明,粮堆表层的种群密度大大高于其它层次。种群在低密度时,上升缓慢。整个变化过程呈“S”形上升。玉米象的种群上升最快,其次为谷蠹、杂拟谷盗。在温度较高时,谷蠧的竞争超过了玉米象,杂拟谷盗的竞争能力最弱,玉米象、谷蠹的取食加快了杂拟谷盗的种群发展。

In this experiment, field conditions were simulated in metal barrels and population dynamics, intraspecies competitions of Sitophilus zeamais(Mots.), Rhizopertha dominica (Fab.), Tribolium confusum (Jac.)in wheat were studied respectively. Results showed that, population density at surface layer were much higher than other layers in barrel. Populations rise slowly under low density, rising curves were in the shape of S. Populations of S. zeamais rise most fastly than R. dominica and T.confusum. Under higher temperature, competition ability of R. dominica was stronger than that of S. zeamais, and that of T. confusum was the weakest. Population development of T. confusum was accelerated owing to damage of S. zeamais and R. dominica.