To understand different responses of soil carbon (C) pools and fluxes to climate warming, we examined the effects of soil warming on soil respiration (Rs) composed of autotrophic (Ra) and heterotrophic (Rh) respirations. Then, we estimated the sensitivities of Rs, Ra, and Rh to elevated temperature. The open-field soil warming experiments were carried out in cool-temperate deciduous broadleaf forests dominated by Quercus crispula, located in Takayama (TKY) and Tomakomai (TOEF). Artificial warming was conducted by installing heating cables into the soil in both sites (+3˚C in TKY and +4.7˚C in TOEF). To assess how Rs, Ra, and Rh are affected by the treatment differently, we combined the soil warming and trenching treatments. Experimental warming resulted in increases of Rs and Rh (about 15% and 53% in TKY and about 34% and 52% in TOEF) and little increase of Ra. Temperature sensitivities (Q₁₀) of Rs and Ra acclimatized to the warming treatment in both sites, while that of Rh did not acclimatize. These experimental evidences would improve our model accuracy of C cycle processes in plant-soil system under future climate change.