Long Term of Soil Carbon Stock in No-Till System Affected by a Rolling Landscape in Southern Brazil

In the 1960s, a conservationist agricultural practice known as “no-tillage system” was adopted. Several benefits such soil erosion reduction and carbon sequestration, among others, could be ascribed to no-till systems. Therefore, it is important evaluate long-term sustainability of this system in different environments. This study has objective organic dynamic (40-year) on rolling landscape Southern Brazil. A systematic grid with four transversal–longitudinal transects used for sampling. Soil samples from 0–20, 20–40, 40–60 cm depths were collected (16 trenches × 3 1 sample per layer = 48), forest nearby control (4 12). The at site showed 20% more stock than 0–20 depth. However, entire profile (0–60 cm) similar soil. (0–20 depleted rate 0.06 kg C m−2 year−1, summing up loss 2.43 m−2. addition, non-uniform hillslope affected redistribution through landscape, since convex by 37% (15.87 m−2) when compared concave sector (25.27 m−2). On average, subtropical agroecosystem much lower those reported literature, well our initial expectations. capable preserving deepest layers. presently, losing topsoil greater input.