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Effects of controlled environmental changes on the mineralization of soil organic matter

  • Choi, In-Young (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Nguyen, Hang Vo-Minh (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Choi, Jung Hyun (Department of Environmental Science and Engineering, Ewha Womans University)
  • Received : 2017.01.05
  • Accepted : 2017.04.04
  • Published : 2017.12.31

Abstract

This study investigated how the combined changes in environmental conditions and nitrogen (N) deposition influence the mineralization processes and carbon (C) dynamics of wetland soil. For this objective, we conducted a growth chamber experiment to examine the effects of combined changes in environmental conditions and N deposition on the anaerobic decomposition of organic carbon and the emission of greenhouse gases from wetland soil. A chamber with elevated $CO_2$ and temperature showed almost twice the reduction of total decomposition rate compared to the chamber with ambient atmospheric conditions. In addition, $CO_2$ fluxes decreased during the incubation under the conditions of ambient $CO_2$ and temperature. The decrease in anaerobic microbial metabolism resulted from the presence of vegetation, which influences the litter quality of soils. This can be supported by the increase in C/N ratio over the experimental duration. Principle component analysis results demonstrated the opposite locations of loadings for the cases at the initial time and after three months of incubation, which indicates a reduction in the decomposition rate and an increasing C/N ratio during the incubation. From the distribution between the decomposition rate and gas fluxes, we concluded that anaerobic decomposition rates do not have a significantly positive relationship with the fluxes of greenhouse gas emissions from the soil.

Keywords

Climatic change;Decomposition rate;Flux;N deposition;Soil organic matter

Acknowledgement

Supported by : National Research Foundation of Korea

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