Characteristics and Factors of Nitrate Pollution in Soil in the Alluvial-pluvial Fan of Hun River
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Abstract:
Soil nitrate is one of the critical sources of groundwater nitrate; therefore the study of the characteristics of soil nitrate is important for the control and remediation of soil and groundwater pollution. In order to investigate the pollution characteristics of soil nitrate in the alluvial-pluvial fan of Hun River, five monitoring sections and 50 sampling locations were designed in the alluvial-pluvial fan across the Hun River, and the soil samples were collected and conducted nitrate measurement in a vertical interval of every 0.8 m at each sampling location. The Hazen probability curve was used to determine the standard values of soil nitrate in the alluvial-pluvial fan of Hun River, and the single factor index method and Nemero pollution index evaluation method were used to analyze the pollution characteristics of soil nitrate at different depths and sections. The pollution characteristics were analyzed in association with the regional land use type and regional organic matter content to determine their impacts on nitrate pollution. The results showed that the standard nitrate concentration is 2.58 mg/kg and nitrate has medium level pollution in this area, and the existence of sewage river, regional land use type, and regional organic matter content can have significant impacts on nitrate pollution.
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