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田间喷洒的农药,部分进入土壤之中,部分经径流进入地面水体。水中的水生植物吸收土壤中残留的农药,鸭鹅等水禽再吃水草,它们体内也有了农药残留。蜗牛等软体动物柄居在水域的底泥上,底泥吸附和吸收农药,农药因此又残留在蜗牛体内。此外,水中大量浮游生物吸收水中的农药,食肉昆虫又吃浮游生物,鱼又食食肉昆虫,人捕鱼食鱼,鹤和鹰也食鱼,最终农药渗透到复杂的食物网中。
Pesticides sprayed in the fields partially enter the soil and partly run into ground water by runoff. Aquatic plants in the water to absorb residual pesticides in the soil, duck and goose and other waterfowl eat grass, they also have pesticide residues in the body. Snails and other mollusks handle the bottom sediment in the water, sediment adsorption and absorption of pesticides, pesticides and therefore remain in the snail body. In addition, a large number of plankton in the water to absorb water pesticides, carnivorous insects and eating plankton, fish and eating meat insects, people fishing fish, cranes and eagles also eat fish, and eventually penetrate the complex food network of pesticides.