库滨带营养物质释放与净化截流作用规律研究

Release and Purification of Eutrophicated Compounds at Buffer Zone of a Reservoir

在水库库滨地带进行了营养物质释放与截流净化作用规律的试验研究,结果表明:在上方来水的条件下,农田表现为营养物质的释放,且输出的总氮和总磷的浓度处一种相对稳定的状态,近一步说明农田是水库水体的重要的非点源污染源;近水端的湿生草本带也表现为营养物质的释放;乔灌草带对总磷的去除效果较明显,但对总氮则表现为释放。当原水总磷浓度为1.6mg.L-1时,乔灌草带对总磷的去除率为4.21%;挺水植物带对总氮和总磷都有净化作用,去除率为2.51%,总氮的去除率为6.48%。

In order to study release and purification function of eutrophicated nitrogen and phosphorus at buffer zone of a reservoir,a series of field tests have been done.The study showed that total phosphorus and total nitrogen were in a stable output situation when upside water flow through farmland,suggesting that farmland be a very important non-point pollution source.In addition,the nutrition compounds also output from wet grassland near the water body.Total phosphorus could be removed in arbor shrub and grassland,while consistency of total nitrogen increased in this area.When total phosphorus content was 1.6 mg·L-1 in original water,the removal rate of TP was 4.21%.It has been indicated that total phosphorus and nitrogen could be removed in the bulrush land with removal rate of 2.51% for TP and removal rate of 6.48% for TN,respectively.