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| 岩溶农业区地下河流域硝酸盐污染来源——以重庆青木关岩溶区为例 |
| Nitrate Pollution Source Research of Karst Agricultural Area——A Case Study in Qingmuguan Undergroundriver, Chongqing |
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| DOI： |
| 中文关键词: 岩溶 农业区 硝酸盐污染 15N同位素 地下水 |
| 英文关键词: Karst Agricultural region Nitrate-nitrogen pollution 15Nisotope Ground water |
| 基金项目:国家青年基金资助项目（41101036,41102161）；中央高校基本科研业务费专项基金资助项目（XDJK 2009C103） |
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| 摘要点击次数: 1973 |
| 全文下载次数: 1149 |
| 中文摘要: |
| 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。 |
| 英文摘要: |
| Groundwater in qingmuguan underground river was monitored using hydro-chemical and 15N isotope 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 δ15N concentration of tianchi-2 was -0.705%~+0.706%,mainly influenced by artificial 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 δ15 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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