奎河铜山段两岸地下水氮平衡和三氮污染研究

Research on Nitrogen Balance and Three Nitrogen Pollution in Bank Groundwater of Tongshan Section of Kuihe River

研究了奎河铜山段两岸地下水的氮污染状况及3种不同植被系统的氮平衡。结果表明:河水对氮污染具有一定的自净能力;两岸渗流系统对氮的去除率很高,污染河水对两岸20 m外的地下水氮污染影响很小;两岸不同植被系统地下水氮污染的程度表现为:蔬菜系统>小麦玉米轮作系统>树林系统,其中前两个植被系统地下水氮污染的主要来源是施肥。

We studied the nitrogen pollution status of the groundwater and the nitrogen balance of three different vegetation systems along the two banks of Tongshan section of the Kuihe River. The results showed that the river water had a certain self - purification ability on nitrogen pollution. The infiltration system of two banks was quite effective in removing nitrogen from groundwater, and the polluted river water had little effect on the nitrogen pollution of groundwater beyond 20 m from the bank. The nitrogen pollution degree of groundwater in different vegetation systems on the two banks showed the following sequence： vegetable system 〉 wheatmaize rotation system 〉 forest system, and the groundwater nitrogen pollution in the former two vegetation systems was mainly caused by fertilization.