J4 ›› 2012, Vol. 42 ›› Issue (4): 1145-1150.

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Effects of Saline-Alkali Soil on Nitrogen Transformations

ZHANG Xian-fu, LI Hui, HONG Mei, SONG Bo-yu, ZHANG Fu-quan, LIANG Shuang   

  1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education,Jilin University,Changchun130021,China
  • Received:2011-10-08 Online:2012-07-26 Published:2012-07-26

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Abstract:

The main component NaHCO3 was considered as the main factor in Soda saline-alkali soil in order to study the effects of different soda salinization levels on nitrogen adsorption, mineralization, nitrification and denitrification by using laboratory incubation. The results showed that in the experimental conditions with the different NaHCO3 concentrations, the NH+４-N adsorptions obeyed Langmuir linear adsorption isotherm, while, the N mineralization could be described by the firstorder kinetic equation. With the increasing of NaHCO3 concentration, the N mineralization potential (M0) and mineralization rate constant (km) decreased from 358.48 mg/kg and 0.088 d-1 to 337.08 mg/kg and 0.059 d-1, respectively, and the nitrification could be described by “S” curve model, the maximal rate of nitrification (kmax) decreased from 22.56 to 16.68 mg/(kg·d); the denitrification obeyed zero-order kinetic equation, and there was no significant effect of mixed concentrations variation of NaHCO3 and Na2CO3 on the denitrification rate constant (kd). NH+４-N adsorption, organic nitrogen mineralization and nitrification were inhibited with NaHCO3 concentrations increasing in soda saline-alkali soil.

Key words: soda saline-alkali soil, nitrogen, adsorption, nitrification, denitrification, kinetics

CLC Number: 

  • X53
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