Organic C Fractions in Topsoil under Different Management Systems in Northeastern Brazil

The conversion from native forest to other land-use systems can decline the soil organic carbon (SOC) in tropical soils. However, conservationist management could mitigate SOC losses, promoting functioning and stability of agricultural This study aimed address influence different on fractions Northeastern Brazil. Topsoil samples were collected areas under pasture (PAS), no-tillage (NT1 NT2), eucalyptus (EUC), forests Cerrado Northeastern, Total C, microbial biomass (MBC), particulate (POC), mineral-occluded C (MOC), as well fulvic acids (C-FA), humic (C-HA), humin (C-HUM) accessed. results showed that land maintained similar levels total (TOC) stocks PAS, NT1, NT2, EUC compared Cerrado. Soils with input permanent diverse fresh material, such EUC, presented high MBC POC, lowest C-FA:TOC C-HA:TOC ratios. include cropping rotations associated species Mombasa grass prevents topsoil losses active compartments Brazilian Northeast. It suggests sustainable should be emphasized maintain improve status C.