Global patterns and edaphic-climatic controls of soil carbon decomposition kinetics predicted from incubation experiments.

ABSTRACT: Knowledge about global patterns of the decomposition kinetics of distinct soil organic matter (SOM) pools is crucial to robust estimates of land-atmosphere carbon fluxes under climate change. However, the current Earth system models often adopt globally-consistent reference SOM decomposition rates (k_ref), ignoring effects from edaphic-climate heterogeneity. Here, we compile a comprehensive set of edaphic-climatic and SOM decomposition data from published incubation experiments and employ machine-learning techniques to develop models capable of predicting the expected sizes and k_ref of multiple SOM pools (fast, slow, and passive). We show that soil texture dominates the turnover of the fast pools, whereas pH predominantly regulates passive SOM decomposition. This sugge

SUBMITTER: Xiang D 

PROVIDER: S-EPMC10105724 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature