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• W2886421132 abstract "Nitrogen (N) fertilizers have been extensively used to maintain soil fertility in intensively agricultural soils, creating serious environmental pollution. In this study, a 70-day incubation experiment was conducted to investigate the effects of different N fertilizers (urea, manure, straw) on N mineralization, soluble organic nitrogen (SON) dynamics and its leaching potential in typical agricultural soils of the Shandong Peninsula. The results showed that the addition of N fertilizers affected the SON pools and soil N mineralization in different ways owing to their various properties and interaction with soils. When comparing treatments, urea application was found to decrease SON content, whereas manure and straw addition increased the SON content after long-term incubation. Considering that SON content depended on a complicated formation process and consumption process, no direct link between SON content and N mineralization capacity was observed in different treatments. Additionally, we analyzed free amino acids (FAAs) in SON and found that FAA content was negatively correlated with N mineralization, except for the straw treatment. This suggested that FAAs were important substrates of N mineralization in soils. In addition, the composition of SON was determined by 3-dimensional excitation-emission matrix and ultraviolet-visible absorbance spectrophotometer after long-term incubation. The PIII+V/PI+II+IV ratio, SUVA254, and A253/A203 ratio decreased after fertilizer application. This indicated that fertilizer addition decreased the SON humification degree and increased SON leaching. Therefore, SON should be taken into account when optimizing fertilization management and evaluating the risk of N leaching in groundwater systems." @default.
• W2886421132 created "2018-08-22" @default.
• W2886421132 creator A5041586845 @default.
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• W2886421132 date "2018-10-01" @default.
• W2886421132 modified "2023-10-13" @default.
• W2886421132 title "Soluble organic nitrogen cycling in soils after application of chemical/organic amendments and groundwater pollution implications" @default.
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• W2886421132 doi "https://doi.org/10.1016/j.jconhyd.2018.08.003" @default.
• W2886421132 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30268411" @default.
• W2886421132 hasPublicationYear "2018" @default.
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