Soil exchange rates of COS and CO¹⁸O differ with the diversity of microbial communities and their carbonic anhydrase enzymes.

ABSTRACT: Differentiating the contributions of photosynthesis and respiration to the global carbon cycle is critical for improving predictive climate models. Carbonic anhydrase (CA) activity in leaves is responsible for the largest biosphere-atmosphere trace gas fluxes of carbonyl sulfide (COS) and the oxygen-18 isotopologue of carbon dioxide (CO¹⁸O) that both reflect gross photosynthetic rates. However, CA activity also occurs in soils and will be a source of uncertainty in the use of COS and CO¹⁸O as carbon cycle tracers until process-based constraints are improved. In this study, we measured COS and CO¹⁸O exchange rates and estimated the corresponding CA activity in soils from a range of biomes and land use types. Soil CA activity was not uniform for COS and CO

SUBMITTER: Meredith LK 

PROVIDER: S-EPMC6330096 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature