High peroxidase activity and low microbial residues in Alaskan permafrost may amplify carbon loss risk under climate changes

Data S1. Synthesizing data on the proportion of total necromass C in SOC in the Tibetan Plateau.

Data S2. Synthesizing data on the proportion of total necromass C in SOC in global ecosystems.

Data S3. Properties of permafrost soils utilized within this study.

Data S4. Data of mineral-OH and C functional groups present in permafrost soils, as depicted in Fig. 4c.

Data S5. Data of the color reaction curves resulting from 3,3', 5,5'- tetramethylbenzidine (TMB) catalyzed by natural enzyme (HRP, horseradish peroxidase), soils, and soil solution, as depicted in Supplementary Figure 8.