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


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.


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


Supported by : National Research Foundation of Korea


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