污水灌溉对我国农业生态系统的影响及其对策

本文运用生态学原理,分析了污灌区农业生态系统的特点,指出了污灌在农业生态系统中既起着水源和肥源,又起着污染源的三重作用。同时,从正反两方面阐述了污灌对我国农业生态系统的影响,提出了污灌条件下建立农业生态系统良性循环的途径,即(1)尽量控制污水中的污染物质进入农业生态系统;(2)减少污染物质在农田生态系统的累积;(3)改变污染物在农业生态系统中的迁移途径。

The Influences of Sewage Irrigation on Agricultural Ecosystem and Its Countermeasures in Our Country

In this paper, the characteristics of agricultural ecosystem under sewage irrigation have been discussed by applying ecological priaciple, and the views that sewage irrigation plays three roles of water source, fertilization source, and pollution source, have been put forward. Positive and negative influences of sewage irrigation on agricultural ecosystem in our country have been described in this paper, too. It propoces that following approaches should be taken to establish a good-circle agricultural ecosystem under sewage irrigation;(1) Controling the amount of pollutants in sewage into agricultural ecosystem under tolerable level;(2) reducing the cumulation of pollutants in farming ecosystem;(3) Changing the transportation way of pollutants in agricultural ecosystem.