Although soil respiration is known to increase with warming, the long‐term stability of total forest soil organic carbon (SOC) stocks and their compositional changes remain uncertain. Through a 12‐year soil warming experiment (+1.21°C) in temperate and subtropical forests, we found that SOC content remained stable in both 0–10 cm and 10–20 cm layers. A supporting global meta‐analysis further indicated that substantial SOC loss...