Evaluation of the soil carbon budget under different upland cropping systems in central Hokkaido, Japan

  • Mu Z
  • Kimura S
  • Toma Y
 et al. 
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Abstract

Abstract To evaluate the carbon budget in soils under different cropping systems, the carbon dioxide (CO2) flux from soils was measured in a total of 11 upland crop fields within a small watershed in central Hokkaido over the no snow cover months for 3 years. The CO2 flux was measured using a closed chamber method at bare plots established in each field to estimate soil organic matter decomposition. Temporal variation in instantaneous soil CO2 fluxes within the sites was mainly controlled by soil temperature and moisture. Annual mean CO2 fluxes and cumulative CO2 emissions had no significant relationship with soil temperature and moisture (P > 0.2). However, there was a significant quadratic relationship between annual mean CO2 flux or cumulative CO2 emission and soil clay plus silt content (%) (R2 = 0.72∼0.74, P 

Author-supplied keywords

  • CO2flux
  • Carbon budget
  • Soil texture
  • Upland cropping system

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Authors

  • Zhijian Mu

  • Sonoko D. Kimura

  • Yo Toma

  • Ryusuke Hatano

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