Soil CO2 efflux in a warm-temperature and sub-alpine forest in Jeju, South Korea
2017
Jeong, H.M., National Institute of Ecology, Seocheon, Republic of Korea | Jang, R.H., Kongju National University, Gongju, Republic of Korea | Kim, H.R., Nakdonggang National Institute of Biological Resources, Sangju, Republic of Korea | You, Y.H., Kongju National University, Gongju, Republic of Korea
Background: This study investigated the temporal variation in soil CO₂ efflux and its relationship with soil temperature and precipitation in the Quercus glauca and Abies koreana forests in Jeju Island, South Korea, from August 2010 to December 2012. Q. glauca and A. koreana forests are typical vegetation of warm-temperate evergreen forest zone and sub-alpine coniferous forest zone, respectively, in Jeju island. Results: The mean soil CO₂ efflux of Q. glauca forest was 0.7 g CO₂ m−²h−¹ at 14.3 degree Celsius and that of A. koreana forest was 0.4 g CO₂ m−²h−¹ at 6.8 degree Celsius. The cumulative annual soil CO₂ efflux of Q. glauca and A. koreana forests was 54.2 and 34.2 t CO₂ha−¹ , respectively. Total accumulated soil carbon efflux in Q. glauca and A. koreana forests was 29.5 and 18.7 t C ha−1 for 2 years, respectively. The relationship between soil CO₂ efflux and soil temperate at 10 cm depth was highly significant in the Q. glauca (r ² = 0.853) and A. koreana forests (r ² = 0.842). Soil temperature was the main controlling factor over CO₂ efflux during most of the study period. Also, precipitation may affect soil CO₂ efflux that appeared to be an important factor controlling the efflux rate. Conclusions: Soil CO₂ efflux was affected by soil temperature as the dominant control and moisture as the limiting factor. The difference of soil CO₂ efflux between of Q. glauca and A. koreana forests was induced by soil temperature to altitude and regional precipitation.
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