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Dynamics of Soil Organic Nitrogen and its Functions in Soil Carbon Stabilization Processes

  • Xianzhi Song
Conference paper

Abstract

Soil organic nitrogen (SON) plays an important role in long-term ecosystem productivity and the global C cycle. But estimation and prediction involved with SON for soil C sequestration are not completely accurate due to insufficient knowledge of the dynamics of SON and its chemical composition. We hypothesized that the dynamics of SON has a correlated relationship with SON thermal properties. This hypothesis was examined through measuring the optimal pyrolysis temperatures of SON in soils and humic and fulvic acids via pyrolysis gas chromatographic atomic emission detection method (GC/AED). It appeared that SON optimal pyrolysis temperature shifted from 500°C for the surface soil to 400°C for the 25–38 cm depth soil. The low shift of optimal pyrolysis temperatures with increasing humification was also observed from the independent fulvic and humic acids (from 700°C to 600°C), suggesting a relationship of SON thermal property with its dynamic changes. The high thermal stability of SON in combination with the major non-heterocyclic N components coupled with polynuclear C illustrates the contributions of SON to the biological and chemical stabilities of SOM.

Keywords

Humic Substance Humic Acid Fulvic Acid High Thermal Stability Pyrolysis Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Dorodnikov, M., A. Fangmeier, and Y. Kuzyakov. 2007. “Thermal Stability of Soil Organic Matter Pools and Their δ13C Values after C3–C4 Vegetation Change.” Soil Biology and Biochemistry. 39:1173–1180CrossRefGoogle Scholar
  2. Francioso, O., D. Montecchio, P. Gioacchini, and C. Ciavatta. 2005. “Thermal Analysis (TG/DTA) and Isotopic Characterization ( 13C – 15N) of Humic Acids From Different Origins.” Applied Geochemistry. 20:537–544.CrossRefGoogle Scholar
  3. Huang, P. M., and J. M. Bollag. 1998. “Minerals-organics-microorganisms interactions in the soil environment.” In P.M. Huang, N. Senesi and J. Buffle (Eds.), Structure and Surface Reactions of Soil Particles, IUPAC Series on Analytical and Physical Chemistry of Environmental Systems. Volume 4. John Wiley and Sons. Chichester, England, pp. 3–39.Google Scholar
  4. Knops, M. H., and D. Tilman. 2000. “Dynamics of Soil Nitrogen and Carbon Accumulation for 61 Years After Agricultural Abandonment.” Ecology. 81:88–98.CrossRefGoogle Scholar
  5. Kuzyakov, Y., A. Mitusov, and K. Schneckenberger. 2006. “Effect of C3–C4 Vegetation Change on δ13C and δ15N Values of Soil Organic Matter Fractions Separated by Thermal Stability.” Plant and Soil. 283:229–238.CrossRefGoogle Scholar
  6. Neff, J.C., A.R. Townsend, G. Glexiner, S.J. Lehman, J. Turnbull, and W.D. Browman. 2002. “Variable Effects of Nitrogen Additions on the Stability and Turnover of Soil Carbon.” Nature. 419:915–917.CrossRefGoogle Scholar
  7. Ogle, S.M., F.J. Breidt, M. Easter, S. Williams, and K. Paustian. 2007. “An Empirically Based Approach for Estimating Uncertainty Associated With Modelling Carbon Sequestration in Soils.” Ecological Modelling. 205(3–4):453–463.CrossRefGoogle Scholar
  8. Siewert, C. 2001. “Investigation of the Thermal and Biological Stability of Soil Organic Matter.” Ph. D. Thesis. Shaker-Verlag, Aachen.Google Scholar
  9. Six, J., G. Guggenberger, K. Paustian, L. Haumaier, E.T. Elliott, and W. Zech. 2001. “Sources and Composition of Soil Organic Matter Fractions Between and Within Soil Aggregates.” European Journal of Soil Science. 52:607–618.CrossRefGoogle Scholar
  10. Song, X., and S.O. Farwell. 2004. “Pyrolysis Gas Chromatography Atomic Emission Detection Method for Determination of N-containing Components of Humic and Fulvic Acids.” Journal of Analytical and Applied Pyrolysis. 71:901–915.CrossRefGoogle Scholar
  11. Vairavamurthy, A., and S. Wang. 2002. “Organic Nitrogen in Geomacromolecules: Insights on Speciation and Transformation with K-edge SANES Spectroscopy.” Environmental Science and Technology. 36:3050–3056.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Xianzhi Song
    • 1
  1. 1.Western Carolina UniversityCullowheeUSA

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