Modeling Calcite's Sensitivity to Biogenic CO₂ Production: A Pathway to Soil CO₂ Efflux Partitioning.

ABSTRACT: Soil inorganic carbon (SIC), primarily calcite, represents a potentially reactive carbon reservoir, influencing soil-atmosphere CO₂ exchange and acid-base buffering processes. Though often considered stable, SIC is sensitive to biogenic CO₂ and acidification, risking extra CO₂ emissions beyond soil organic matter (SOM) mineralization. This study investigates SIC reactivity using δ¹³C-enriched calcite (11.9 t ha^-1, +102.02‰) under organic residue decomposition, examining the effects of residue type (maize vs wheat), degradability (leaves vs roots), and placement (mixing vs mulching). Incubations at 25 °C with 80% soil-water saturation coupled high-resolution pH optodes and HYDRUS-PHREEQC simulations to quantify SIC reactivity. Mixed app

SUBMITTER: Tetteh K 

PROVIDER: S-EPMC12613815 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature