于2010年6月-10月每月对青木关地下河水进行监测,利用15N同位素技术并结合水化学指标,分析地下河的水化学特征以及硝态氮来源的时空变化特征.结果表明,地下河出口丁家龙洞硝态氮质量浓度(5.08 mg/L)比入口天池2号点(0.842 mg/L)高6倍多.天池2号点处δ15N为-0.705％～+0.706％,主要受到人造化肥和天然土壤矿化的有机氮的影响,总体变化幅度不大,地下水受外界影响较小.出口丁家龙洞处的δ15N为-2.15％～+3.78％,平均值为+1.01％,总体值高,且变化幅度大.%Groundwater in qingmuguan underground river was monitored using hydro-chemical and N iso-tope techniques to investigate temporal and spatial variations of nitrate-nitrogen and its possible sources from June ,2010 to October,2010. The results show that nitrate concentrations are 5.08mg/L of the outlet dingjia cave and 0. 842 mg/L of the inlet tianchi 2 of the underground river, nitrate concentrations of groundwater are lower at the inlet tianchi 2. The S15 N concentration of tianchi 2 was -0. 705% ～ +0. 706% ,mainly influenced by artifi-cial fertilizers and natural soil mineralized organic nitrogen. Overall change range was not big. The point that the nitrogen pollution was low, Groundwater by outside influence more stable. Outlet dingjia cave 515 Nconcentration change range -2. 15%～ + 3. 78% ,the average was + 1. 01% , Overall concentration was high and changes much more extensive.
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