不同潜水埋深再生水灌溉夏玉米土壤氮素运移研究

Soil nitrogen transport and transformation of reclaimed water irrigated summer-maize under different groundwater levels

    摘要
  • 摘要: 通过再生水灌溉田间试验，探讨了不同潜水埋深条件下（2 m、3 m、4 m），再生水灌溉对土壤中NO3--N、NH4+-N及地下水中NO3--N的影响。试验结果表明：再生水灌溉后，土壤中NO3--N含量均显著增加；不同潜水埋深再生水灌溉对土壤中NH4+-N含量影响不明显。灌水水平为900 m3·hm-2,不同潜水埋深（2 m、3 m、4 m）地下水NO3--N浓度分别增加34.67%、24.94%、20.88%，灌水水平为1 200 m3·hm-2不同潜水埋深地下水NO3--N浓度分别增加58.42%、38.98%、27.21%，潜水埋深越深地下水硝态氮浓度增加越小。表明潜水埋深越浅因淋溶和硝化作用产生的NO3--N造成浅层地下水污染的风险越大。

     

    Abstract: The effect of reclaimed water irrigation on soil nitrogen content, nitrate concentration in groundwater at different groundwater depths (2 m, 3 m and 4 m) was investigated. Experimental results indicate that soil nitrate nitrogen content obviously increases after irrigation. Ammonia nitrogen is not significantly affected by groundwater table and reclaimed water irrigation. Nitrate nitrogen concentration in groundwater at different depths (2 m, 3 m and 4 m) increases by 34.67%, 24.94% and 20.88% at 900 m3·hm-2 irrigation, and it increases by 58.42%, 38.98% and 27.21% at 1 200 m3·hm-2 irrigation respectively. The deeper the groundwater the lower is nitrate nitrogen concentration in groundwater. Pollution risk of nitrate nitrogen from leaching and nitrification increases with increasing groundwater level.

     

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