11:30 AM - 11:45 AM
[ACG40-04] The influence of long-term soil warming on heterotrophic respiration in an evergreen broad-leaved forest in Hiroshima
Keywords:Global warming, Heterotrophic respiration, Chamber , Evergreen broad-leaved forest, Soil organic carbon , Asian monsoon
To examine the long-term influence of soil warming on Rh in an Asian monsoon forest, we set multi-channel automated chamber and soil warming systems in an evergreen broad-leaved forest in western Japan, Higashi Hiroshima in September 2007. We prepared 10 trenched chambers (90 cm × 90 cm × 50 cm) to continuously measure Rh. Half of those trenched chambers were artificially warmed by infrared heaters 1.6 m above the soil surface (+2.5ºC), and influence of soil warming on Rh was examined by comparing Rh and warmed Rh for 10 years.
Soil moisture and Rh were strongly related during summer period from July to September. Few precipitation and low soil moisture level in summer period caused to decrease Rh, and the decrease resulted in the decline of annual temperature sensitivity of Rh (Q10). Those results suggested that precipitation and soil moisture during summer period is one of the important control factor for long-term response of Rh to warmer environment.