Stock and indices of carbon management under different soil use systems

The aim of this study was to evaluate the stock total organic carbon (TOC) and perform physical-granulometric fractionation soil matter (SOM) in different management systems (MS). Three MS one reference area Native Forest (NF) were studied, three sugarcane (SC), permanent pasture (PP) no-tillage system (NTS). Soil samples collected 0–0.05, 0.05–0.10, 0.10–0.20-m layers. density (Sd), TOC, stratification index (SI), (StockC), variation StockC (∆StockC), content particulate (C-POM) mineral (C-MOM), (CSI), lability (L), (LI), (CMI) determined. presented higher Sd than NF area. had TOC contents first layers, reaching 25.40 g kg-1 0–0.05-m layer, with PP having values layer. showed highest levels C-POM (15.25 kg-1) C-MOM (10.15 In NTS superior others. Regarding content, SC CMI observed areas increased reduced levels. modified POM fraction, MOM fraction most impacted by SOM altered superficial