Soil CO₂ efflux in clear-cut and uncut red pine (Pinus densiflora S. et Z.) stands in Korea
2008
Kim, Choonsig
This study was carried out to determine the effects of clear-cutting on soil CO₂ efflux in a 42-year-old pine (Pinus densiflora S. et. Z.) stand. The variation of soil CO₂ efflux rates with soil temperature, soil pH, soil moisture and soil organic carbon (C) content was measured monthly for 1 year in two pine plots; a clear-cut pine (CCP) and an uncut pine (UCP) plots. Mean soil CO₂ efflux rates during the study period were significantly higher (P <0.05) in CCP (0.52gCO₂ m⁻² h⁻¹) than in UCP (0.37gCO₂ m⁻² h⁻¹). High soil CO₂ efflux rates in CCP were attributed to the change of soil temperature, soil pH, soil organic C and soil moisture content following canopy removal. In addition, soil temperature in CCP was significantly higher (1-3°C) than in UCP except during winter (P <0.05). Soil pH was also significantly higher (0.1-0.5units) in CCP than in UCP (P <0.05), suggesting a better environment for microbial or root growth activity. In contrast to soil temperature or soil pH, soil organic C and soil moisture content were significantly lower in CCP than in UCP (P <0.05). The results indicated that the increased soil CO₂ efflux rates in CCP compared with UCP could be due to the combined effect of high soil temperature, high soil pH, low soil organic C and soil moisture content.
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