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中国农学通报

中国农学通报 ›› 2017, Vol. 33 ›› Issue (30): 56-60.doi: 10.11924/j.issn.1000-6850.casb16090039

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

pH 对浅层地下水中“三氮”迁移转化的影响

杨岚鹏,李娜,张军   

  1. 中南林业科技大学,海南医学院热带医学与检验医学院,海南医学院热带医学与检验医学院
  • 收稿日期:2016-09-07 修回日期:2017-10-18 接受日期:2016-10-25 出版日期:2017-10-31 发布日期:2017-10-31
  • 通讯作者: 李娜
  • 基金资助:
    海南医学院科研培育基金“浅层地下水中亚硝酸盐迁移转化机理实验研究”(HY2012-017)；海南医学院创新创业训练计划实验项目“海南 乐东地下水硝酸盐含量调查及分析”(HYCX2015040)。

Effect of pH Value on Migration and Transformation of“Three Nitrogen”in Shallow Groundwater

  • Received:2016-09-07 Revised:2017-10-18 Accepted:2016-10-25 Online:2017-10-31 Published:2017-10-31

摘要： “三氮”也就是氨氮、硝酸盐氮、亚硝酸盐氮，其污染已成为地下水污染的常见形式，研究“三氮” 的迁移转化机理对浅层地下水“三氮”的污染控制有重要意义。以海口南渡江周边地区砂壤土为研究介 质，通过室内土柱淋滤试验，研究在 pH 6.5、5.5、4.5的条件下，用 100 mg/L氮肥溶液淋滤，“三氮”的迁移 转化情况。结果表明：在 pH 6.5和 5.5时，从 1号采样点到 3号采样点 NH4+-N、NO2--N、NO3--N的浓度总 体趋势是下降，土壤对“三氮”的去除作用包括土壤的吸附作用和硝化及反硝化作用。在 pH 6.5时 NH4+- N、NO2--N、NO3--N的去除效率分别为 57.2%、65.3%、91.6%。在 pH 5.5时，NH4+-N、NO2--N、NO3--N的去 除效率为 46.3%、61.2%、60.4%。pH 6.5在吸附作用、硝化作用和反硝化作用的最佳 pH范围内，因此对 “三氮”去除效率最高。在 pH 4.5时 NO2--N浓度由 141.3 μg/L增至 147 μg/L。NO3--N的含量由 11.3 mg/L 增至 34.56 mg/L，说明在 pH 4.5时，受到酸性环境的抑制硝化作用和反硝化作用减弱，且土壤对 NO2--N 和 NO3--N吸附效果较小，可能导致土壤中 NO2--N和 NO3--N的积累。海南地区土壤呈酸性，应适时监测 地下水“三氮”的含量并采取相应的控制措施。

关键词: 溶磷, 溶磷, 钾, 菌株组合, 互作效应, 复合菌肥

Abstract: “Three nitrogen”pollution including ammonia nitrogen, nitrate nitrogen and nitrite nitrogen, which has become a common form of groundwater pollution. Study on the migration and transformation mechanism of “three nitrogen”is important to control shallow groundwater pollution. Sandy loam of surrounding areas in Haikou Nandu River was taken as the research medium, migration and transformation of“three nitrogen”were studied under 100 mg/L nitrogen solution leaching under the pH value of 6.5, 5.5 and 4.5 by soil column leaching experiment. The results showed that the concentration of NH4 +-N, NO2--N and NO3--N decreased from No.1 to No.3 sampling point under pH 6.5 and 5.5, which was mainly due to the adsorption of soil and nitrification and denitrification. The removal efficiencies of NH4+-N, NO2--N and NO3--N were 57.2%, 65.3% and 91.6%, respectively, under pH 6.5, but they were 46.3%, 61.2% and 60.4%, respectively, under pH 5.5. pH 6.5 was in the optimal pH range of adsorption, nitrification and denitrification, and it had the highest removal efficiency of“three nitrogen”. The concentration of NO2--N increased from 141.3 g/L to 147 g/L at pH 4.5, and the concentration of NO3--N increased from 11.3 mg/L to 34.56 mg/L, it indicated that nitrification and denitrification were inhibited by acid environment, and the absorption efficiency was week, which might lead to the accumulation of NO2--N and NO3--N in soil. The soil in Hainan area was acidic, the concentration of“three nitrogen”in groundwater should be monitored timely and corresponding measures should be taken to control the pollution.

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