9:30 AM - 9:45 AM
[ACG30-03] Long-term warming effect on soil respiration in warm-temperate evergreen broad-leaved forest in Kyusyu
Keywords:soil respiration, global warming, chamber, forest soil
In the middle of December 2008, a multi-channel automated chamber measurement system was installed at the Tano forest science station of Miyazaki University, which is a warm-temperate broad-leaved forest site in Kyusyu. We prepared 10 trenched plots with 5 of them artificially warmed by +2.5oC by infrared heaters 1.6 m above the surface for long-term measurement of warming effect on soil respiration.
The average value of soil respiration in control and warmed plots were, respectively, 3.45 μmol CO2 m-2 s-1 and 3.53 μmol CO2 m-2 s-1 in 2009, 3.81 μmol CO2 m-2 s-1 and 4.07 μmol CO2 m-2 s-1 in 2010, 3.31 μmol CO2 m-2 s-1 and 3.81 μmol CO2 m-2 s-1 in 2011, 3.02 μmol CO2 m-2 s-1 and 3.79 μmol CO2 m-2 s-1 in 2012, 3.08 μmol CO2 m-2 s-1 and 3.33 μmol CO2 m-2 s-1 in 2013. The annual warming effect increased soil respiration by 5.4% in 2009, 9.9% in 2010, 18.4% in 2011, 29.5% in 2012, and 11.5% in 2013. The warming effect showed an increasing trend until 2012, but decreased in 2013 due to fewer amount of rainfall in summertime, which caused a much lower moisture in soil.