Isothermal microcalorimerty was employed to characterize self-heating of three types of cereal straws with 40–70 % moisture at 30–70 °C. It revealed microbial heating occurring with upper limit temperatures of ca. 60 °C, 60 °C, and 40 °C and optimal temperatures of ca. 40 °C, 40 °C, and below 30 °C for rice and wheat straw and corn stalk, respectively. Microbial heat evolution patterns vary greatly with temperature, reflecting the stochastic nature and complex activity of microorganisms in the straws. Above the upper limit temperatures of microbial heating, chemical heating happens with distinctly different heat generation patterns and more than an order lower power, but its intensity increases with the temperature. Increasing the moisture content from 40 % to 70 % significantly enhances microbial heating and also promotes chemical heating to reach the strongest power at 50–60 % moisture.

等温微量热用于表征三种谷物秸秆在30–70°C时自热为40–70％的自热。结果表明，微生物加热发生在上限温度为约200℃。60°C，60°C和40°C，最佳温度约为 稻草和小麦秸秆和玉米秸秆分别为40°C，40°C和30°C以下。微生物的热释放方式随温度变化很大，反映了秸秆中微生物的随机性和复杂活动。在微生物加热的上限温度以上，化学加热会以明显不同的生热方式发生，并且功率要低一个数量级以上，但其强度会随温度的升高而增加。