Journal of Forest and Environmental Science

Institute of Forest Science, kangwon National University (강원대학교 산림과학연구소)
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Effects of Experimental Drought on Soil CO2 Efflux in a Larix Kaempferi Stand

  • Kim, Beomjeong (Graduate School of Forestry and Environmental Systems, Kangwon National University) ;
  • Yun, Youngjo (Department of Ecological Landscape Architecture Design, College of Forest and Environment Science, Kangwon National University) ;
  • Choi, Byoungkoo (Division of Forest Sciences, Kangwon National University)
  • Received : 2018.01.31
  • Accepted : 2018.06.12
  • Published : 2018.06.30
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Abstract

Climate models forecast more frequent and a longer period of drought events which may impact forest soil carbon dynamics, thereby altering the soil respiration (SR) rate. We examine the simulated drought effects on soil $CO_2$ effluxes from soil surface partitioning heterotrophic and autotrophic soil respiration sources. Three replicates of drought plots ($6{\times}6m$) were constructed with the same size of three control plots. We examined the relation between $CO_2$ and soil temperature and soil moisture, each being measured at a soil depth of 15 cm. We also compared which factor affected $CO_2$ efflux more under drought conditions. Total SR, autotrophic respiration (AR) and heterotrophic respiration (HR) were positively correlated with soil temperature (p < 0.05), and the relationships were stronger in roof plots than in control plots. Total SR, AR, and HR were negatively correlated only in roof plots, and the only HR showed a significant correlation (p < 0.05, r = -0.59). Soil respiration rates were more influenced by soil temperature than by soil moisture, and this relationship was more evident under drought conditions.

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