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Desorption characteristics of inorganic nitrogen in vegetable garden soil and their effects on soil NO3- N loss potential

YAN Ming-juan1;ZHANG Ming-qing1;CHEN Zi-chong1;LI Juan1;LIN Qiong1;WU Qi-tang2;XIONG De-zhong3   

  1. 1Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China;
    2College of Resources and Environmental Science, South China Agricultural University,
    Guangzhou 510642, China;
    3College of Resources and Environment Science, Fujian Agriculture and Forestry University,
    Fuzhou 350001, China
  • Received:2006-07-27 Revised:2006-11-10 Online:2007-01-18 Published:2007-01-18

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Abstract: With pot experiment and soil nitrogen desorption model, this paper studied the characteristics of nitrogen desorption in vegetable garden soil, and their effects on the NO3--N concentration of soil leachate. The results showed that soil leachate NO3--N concentration had a non-linear relationship with the parameters Q, Cli and C1/λ of soil nitrogen, but the relationship became linear when these eigenvalues were relatively low. A conception of bi-curve cross point was put forward to assess the soil NO3--N loss potential. When the eigenvalues were higher than the bi-curve cross point X0, the NO3--N concentration in soil leachate would be increased rapidly in non-linear form, while on the contrary, the increase would be maintained at a lower level.

Key words: Flooding, Leymus chinensis grassland, Aboveground biomass