田块尺度上土壤/地下水中硝态氮动态变化特征及模拟
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青岛大学环境科学系,青岛大学环境科学系,平度市水文局,青岛大学环境科学系

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S512.1

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国家自然科学(41171183);青岛市民生计划项目(13-1-3-132-nsh)


Dynamic Characteristic and Numerical Simulation of Nitrate Nitrogen in Soil-Groundwater System at Field Scale
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Department of Environmental Science,Qingdao University,Qingdao,Department of Environmental Science,Qingdao University,Qingdao,Hydrological Bureau of Pingdu,Qingdao,Department of Environmental Science,Qingdao University,Qingdao

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    摘要:

    以青岛市大沽河下游地区冬小麦–夏玉米轮作农田为对象,通过田间试验和室内分析,研究了不同深度土壤和地下水中NO3-N在一个轮作周期内的动态变化特征,探讨了不同氮肥施用量和灌溉量对土壤-地下水系统中NO3-N时空分布的影响,并基于土壤水动力学和溶质运移理论对土壤中NO3-N运移过程进行了数值模拟。模拟结果表明:小麦季施氮(N)量达到380 kg/hm2,玉米季施氮量达到290 kg/hm2时,季末剖面深度130 ~ 160 cm土壤NO3-N含量超过10 mg/kg;由地下水NO3-N月累计量估算模型得出,NO3-N在6月和8月向浅部地下水的淋失量最大,分别为7.20、7.67 mg/L。

    Abstract:

    Taking the farmland with summer corn and winter wheat rotation in Dagu River downstream of Qingdao as the study object, the dynamic characteristics of nitrate nitrogen in soil at different depths and groundwater in the rotation period were revealed through field experiment and lab analysis. The impacts of fertilization and irrigation on nitrate in soil and groundwater were explored and the nitrate pollution process in soil and groundwater based on the theory of soil water dynamics and solute transport was numerically simulated. Nitrate content exceeded 10 mg/kg at the depth of 130 – 160 cm at the end of the season, when the nitrogen rates reached N 380 kg/hm2 in wheat season and 290 kg/hm2 in corn season. A monthly cumulative model of nitrate in groundwater was established. Results showed that monthly cumulant of groundwater nitrate was higher in June and August with the values of 7.20 mg/L and 7.67 mg/L respectively.

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王志敏,林 青,王松禄,徐绍辉.田块尺度上土壤/地下水中硝态氮动态变化特征及模拟[J].土壤,2015,47(3):496-502. WANG Zhi-min, LIN Qing, WANG Song-lu, XU Shao-hui. Dynamic Characteristic and Numerical Simulation of Nitrate Nitrogen in Soil-Groundwater System at Field Scale[J]. Soils,2015,47(3):496-502

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  • 收稿日期:2014-05-16
  • 最后修改日期:2014-10-05
  • 录用日期:2014-11-13
  • 在线发布日期: 2015-07-13
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