东西苕溪河网水体硝酸盐氮浓度消长规律探索

Study on Change for Nitrate Concentration in Water Body of Tiaoxi River Net

本项研究通过调查和监测太湖主要入湖水系东西苕溪河网水体中硝酸盐氮浓度的消长情况,在总结其月际变化、年际变化和地域变化的基础上,探讨了该地区非点源排放(主要是过量施用化学氮肥时的农田排水、农田径流冲刷和土地浸蚀溶出)的影响。并推求了河网水体中硝酸盐氮最大浓度值与耕地面积百分率及化学氮肥年施用量之间的线性回归方程。本文提出的有关东西苕溪入口区河网水体硝酸盐氮的消长规律为制定河道含氮污染物入湖总量控制方案的制定提供了科学依据。

The nitrate concentration in water body of Tiao Xi River Net is monitored and investigated. The nonpoint discharge of nitrogen pollutants-creating sources (including field wastewater, rainfall, runoff, erosion loss of soil etc.) is considered depending on change of nitrate concentration monthly, annually and locally. The equations of linear regression between maximum concentration of nitrate, area percent of farmland and annual mean of chemical nitrogen fertilizer application are required. It's very important for proposing scheme for total emission control of nitrogen pollutant from river into the Taihu Lake.