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| The Effects of Groundwater Table Fluctuation on Nitrogen Migration in Aeration Zone |
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| KeyWord:water table fluctuation, fluctuation variation, nitrate nitrogen, ammonium nitrogen, movement |
| Author Name | Affiliation | | LI Xiang | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | YANG Tian-xue | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
School of Resource and Environmental Science, Wuhan University, Wuhan 430072, China | | BAI Shun-guo | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
3.Institute of Urban and Rural Construction, Agricultural university of Hebei, Baoding 071001, China | | XI Bei-dou | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | ZHU Xing-bao | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | YUAN Zhi-ye | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | WEI Yi-mei | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | LI Wei | A State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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| Abstract: |
| In order to investigate the law of nitrate movement with the variation of water table fluctuation, three soil columns were set to simulate the different levels of water table fluctuation, i.e. columnⅠ（control test）, columnⅠ（fluctuation of 15 cm） and column Ⅰ（fluctuation of 30 cm） in a laboratory comparative trial. In the same status of experimental installation, the change of DO, NO-3-N and NH+4-N concentration were tested in these columns respectively. The results showed that the change of DO, NO-3-N and NH+4-N concentration in the column Ⅱ and Ⅲ were more significant than that in the column I and the amplitude of variation in column Ⅲ was larger than that in column Ⅱ. Comparison with the rest level of column Ⅰ, DO and NO-3-N concentration changed correspondingly in a same increase-decrease tendency in column Ⅱ and Ⅲ with the water level rise and fall, and the change range in column Ⅲ is more significant than that in column Ⅱ. This law was also observed in the case of NH+4-N concentration change. After two circular fluctuations, the concentration of NH+4-N in column Ⅱ and Ⅲ decreased and the scope of decrease in column Ⅲ was greater than that in column Ⅱ. However, the NO-3-N concentration had no obvious rule. Therefore, fluctuation can significantly influence the movement of nitrogen in soil column, and the degree of influence is related to the variation of water table fluctuation. Thus, during the groundwater nitrate contamination risk assessment, the influence of water table fluctuation on nitrate movement should not be neglected. |
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