滇池流域大棚种植区面源污染释放规律

Release Regularity of Agricultural Non-point Pollution in Drainage Area in Dianchi Region

为了研究和控制农田面源污染,掌握其污染释放规律,选择紧靠滇池的大渔乡大棚种植区作为研究样本,在2001年进行了旱季和雨季的连续监测。结果表明,旱季的污染负荷很小,只占全年总量的5%～10%,农田污染的释放主要集中在雨季(6月-9月),以地表径流的方式进入滇池,污染负荷占全年总量的90%以上。这主要由滇池流域特定的气候条件和灌溉方式所决定。

With the control of the urban point pollution in recent years in drainage area of Dianchi region,the agricult ural non -point pollution loom large.To study and co ntrol non -point pollution,it is nec essary to be aware of its release regu larity.Taking Dayu Village as a sample,a continuous mon itoring was performed in both dry and rainy seasons in 2001.The result showed that the pollution loading amount in the dry season acco unted for only5%～10%of the whole yea r,and the majority of pollution is di scharged in rainy season(June -September)by surface runoff,accounting for mo re than 90%.That is mainly caused by t he local weather condition and irrigation style.