High carbon use efficiency and low priming effect promote soil C stabilization under reduced tillage
Résumé
Increasing the accumulation of organic carbon (C) in soils is a crucial challenge both for soil fertility and for climate change mitigation. Heterotrophic microbial communities are key drivers of C cycling in the soil and are influenced by cultural practices, among other factors. However, whether changes in microbial communities in turn affect their C degradation functions is not well understood. Here, we studied the effects of prior soil management on the microbial taxonomic composition and activity of soils amended with wheat litter. Prior soil management was either conventional (CONV) (i.e., full inversion ploughing) or reduced tillage (RT) during a 5year period in the same loamy soil in northern France. Soil samples taken from the top 5 cm of field plots were incubated with 13C-labelled litter of either flowering wheat or mature wheat for 29 days at 15 °C. We measured the C-CO2 and 13C-CO2, microbial biomass C (MBC) and 13C, and hydrolytic enzyme activities during decomposition. The initial bacterial and fungal community diversity was studied via high-throughput sequencing of ribosomal genes.
Auteurs, date et publication :
Auteurs Marie Sauvadet , Gwenaëlle Lashermes , Gonzague Alavoine , Sylvie Recous , Matthieu Chauvat , Pierre-Alain Maron , Isabelle Bertrand
Publication : Soil Biology and Biochemistry
Date : 2023
Volume : 123
Pages : 64-73