[ACG54-P10] Long-term warming effect on soil carbon fluxes in a red pine forest in Tsukuba
Keywords:Soil respiration, CH4, Chamber, Global warming
To examine the long-term response of Rh to global warming in Asian monsoon forests, we set multi-channel automated chamber measurement system in a red pine forest in Tsukuba in February 2006. We prepared 12 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 (+2.5°C), and influence of soil warming on Rh was examined by comparing control plots and warming plots. In July 2009, we added 8 chambers to measure Rs. Further, we started continuous measurement of soil CH4 flux in June 2019 using the same chamber measurement system by connecting control unit with CH4 analyzer (915-0011, Los Gatos Research, Inc., USA).
Remarkable exponential relationships between soil temperature and soil CO2 effluxes (Rs and Rh) were confirmed every year. In addition, soil CO2 effluxes were observed to be related with soil moisture especially in summer period from July to September. On the other hand, we found that soil CH4 was negatively related with soil moisture. Those observations suggest that soil temperature is the primary factor controlling soil CO2 effluxes, whereas soil moisture is the main factor controlling soil CH4 uptake in our study site.