Mechanisms of Solid–Liquid Component Regulation of Hydrothermal Humification Productions on Straw Decomposition and Soil Carbon Sequestration under Freeze-Thaw Conditions

These are the experimental data collected from the indoor simulation of freeze-thaw cycles on the decomposition of paddy straw and the promotion of soil carbon fixation by the hydrothermal humification products (solid and liquid products). The experimental data include the rate of straw decomposition, soil carbon-related indicators (SOM/TOC/DOC/MBC/POC/MAOC), enzyme activities related to soil carbon transformation (hydrolytic enzymes and oxidase), as well as related microbial data.