中文摘要：

对抚仙湖流域典型农田区地下水NO3^--N含量进行了近一年的连续测定，探讨了该农田区浅层地下水NO3^--N污染状况及影响因素。数据分析表明，雨季地下水NO3^--N污染较为严重，旱季相对较轻，雨季前的灌溉对地下水中NO3^--N浓度影响显著。稻田地下水NO3^--N浓度明显高于烟草田，尤其是砂质稻田，最高浓度达12．55mg·kg^-1。施用烟草专用复合肥的烟草田和采用少量多次液态施肥的豌豆田，地下水中NO3^--N浓度都比较低。适量施用有机肥的砂田地下水中NO3^--N平均浓度最低，在0．02～2．00mg·kg^-1范围内变化。观测数据还显示，研究区地下水NO3^--N浓度与地下水位埋深之间没有明显的相关性。

英文摘要：

The concentration of NO3^--N in shallow groundwater in typical farmlands Of Fuxianhu Lake catchment was monitored to investigate the groundwater pollution from agricultural activities and the affecting factors, such as rainfall conditions and types of fertilizers applied. The results showed that the concentration of NO3^--N in shallow groundwater in rain seasons was higher than that in dry seasons, and the irrigation just before rain seasons had a remarkable effect on the change of NO3^--N concentration. The concentration of NO3^--N in groundwater in the paddy lands was higher than that in the tobacco lands, and especially in the sandy paddy lands, it was as high as 12.55 mg.L-~. The concentration of NO3^--N in groundwater in the tobacco lands was found to be relatively low when the special compound tobacco fertilizer was used, and the NO3^--N concentration was also low in the pea lands when liquid fertilization was applied at a manner of more times and less volume for each time. The NO3^--N concentration was found as low as 0.02～2.00mg·kg^-1 in the paddy lands when a certain amount of organic fertilizer was properly used. The groundwater table depth had no apparent correlation with the concentration of NO3^--N in the study area.