杞麓湖南岸蔬菜种植区农业面源污染物流失特征

对杞麓湖南岸区域的农业面源污染物流失进行了现场观测。区域农业面源污染物主要通过灌溉后的农田废水和降雨径流2种途径流失。农田废水经循环利用后氮磷素的浓度较杞麓湖湖水明显升高，TN、NH4＋-N、NO3--N、TP、PO43-P和CODcr的均值分别为11．48mg／L、2．39mg／L、8．27mg／L、0．504mg／L、0．149mg／L、62．3mg／L。农田径流的TN平均值范围为20．18±2．45—65．77±14．32mg／L，TP平均值范围为0．5±0．14-1．28±0．5mg／L，COD平均值范围为50±22～110±81mg／L，农田径流呈现出“高氮中磷低有机质”的特征。

The Characteristics of Agricultural Non- Point Source Pollutant in Southern Lake Qilu

The field survey was conducted about the agricultural non -point source pollutants in the southern Qilu Lake. The loss of these pollutants is through two main pathways. One is the agricultural wastewater after irrigation, the other is the runoff from the rainfall. The nitrogen and phosphorus of the recycled agricultural wastewater had a higher concentration than that of the Lake Qilu. The average values of TN, NH4 ＋ - N, NO3 - N, TP, PO43 - P and CODcr were respectively ll. 48mg/L, 2. 39mg/L, 8.27mg/L, 0. 504mg/L, 0. 149mg/L and 62. 3mg/L. The range of the average value of TN, TP and COD of the agricultural runoff was respectively 20. 18 ＋ 2.45 - 65.77 ＋ 14.32mg/L, 0. 5 ＋ 0. 14 - 1.28 ＋ 0.5mg/L and 50 ＋ 22 - 1 l0 ＋ 81mg/L. High concentration of nitrogen, medium level of phosphorus and low level of the organic matters are the characteristics of the agricultural runoff.