Communications in Soil Science and Plant Analysis · 2006 · 33 citations · 32 references
AgricultureEarth SciencesSoil SciencesSoil FertilitySoil Organic MatterSoil ScienceMineral-associated Organic CarbonOrganic Matter AccumulationParticulate Organic MatterSoil Organic Matter FractionsTillage ManagementTillage SystemsAboveground Carbon StocksLabile Carbon FractionsSoil Carbon StocksSoil Organic CarbonSoil Organic Carbon FractionsSoil Organic Matter ContentTillage Effects On Organic MatterTropical Soils
Abstract Two Ferralsols (350 and 600 g kg−1 clay) from the Brazilian Cerrado Region were evaluated for long‐term effects (5 and 8 years) of no tillage on carbon (C) stocks in particulate (>53 µm) and mineral‐associated (<53 µm) soil organic matter (SOM) fractions. Carbon stocks in particulate SOM increased under no tillage compared with conventional tillage, and the rate was higher in the clayey soil (0.62 Mg C ha−1 yr−1) than in the sandy clay loam soil (0.31 Mg C ha−1 yr−1). In contrast, the mineral‐associated SOM in the top soil layer (0–20 cm) was not affected by tillage system. Sequestration of atmospheric C in tropical no‐tillage soils seems to be due to accumulation of C in labile SOM fractions, with highest rates in clayey soils probably due to physical protection. Keywords: Organic matterparticulate fractionno tillagetropical soilsCerrado region
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