中文摘要：

本实验以氨氮（NH4＋-N）、亚硝酸盐氮（NO2--N）、硝酸盐氮（NO3--N）及总氮（TN）为研究目标,选取松塘水库、G井、I井、人工鱼塘、甘家水井、架竹河为研究点。近期（2010年1月-2010年5月）水质动态监测资料表明,千烟洲农业生态系统水环境氮污染以硝酸盐氮（NO3--N）为主,地下水流场上下游差异性较大;地下水流场下游甘家水井,硝酸盐最高含量达22.56 mg/L,最低含量14.80 mg/L,超过世界卫生组织（WHO）规定的生活饮用水标准10 mg/L,检出率100%,出现了硝酸根型地下水;农忙时人工鱼塘、架竹河水中亚硝酸盐氮（NO2--N）含量明显升高,高达约0.20 mg/L,对水中生物的生长极为不利;河、库、井水中氨氮（NH4＋-N））浓度差异不显著,但随时间变化差异明显。通过研究＂三氮＂在地下水中的转化规律,为农业生产和地下污染防治提供依据。

英文摘要：

Taking Songtang reservoir,man-made Pond,Jiazhu River and Water wells as the research objects,ammonia-nitrogen（NH＋4-N）,nitrite-nitrogen（NO-2-N）,nitrate-nitrogen（NO-3-N） and total nitrogen（TN） were studied.Based on dynamic monitoring data of water quality from January to May 2010,nitrogen pollution of water environment of agricultural ecosystems in Qianyanzhou is mainly nitrate-nitrogen（NO-3-N）,there was obvious difference between its upper reaches and lower reaches of the groundwater flow field;the maximum and minimum concentration of NO-3-N in Ganjia water well in lower reaches of the groundwater flow field amounted to 22.56 and 14.80 mg/L,exceeding the standards for drinking water made by the world health organization（WHO）,and detection rates were 100%,nitrate radica1 groundwater has been found;The content of nitrite nitrogen in man-made pond and Jiazhu River was high significantly to 0.20 mg/L during busy seasons,which is extremely harmful to the growth of aquatic life;the concentration of ammonia-nitrogen had no significant difference between river,reservoir and well water,while there was obvious difference along the change of time.The research on the transformation of ＂three nitrogen＂ in groundwater can provide the basis for agricultural production and groundwater pollution control.