Crop rotation, tillage system, and precipitation regime effects on soil carbon stocks over 1 to 30 years in Saskatchewan, Canada

摘要: Abstract For both agronomic and environmental purposes, it is relevant to assess the effect of various land management practices on soil organic carbon (SOC). In North American Great Plains, fallowing was used increase water storage production succeeding crops. addition, tillage done prepare seed beds control weeds. But these led important SOC losses, mainly due increased mineralization with reduced plant C inputs fallowing. recent years, reduction fallowing, use minimum no-tillage diversification crop rotations inclusion pulse crops have been studied. results are variable according climatic situations. long-term data not always available. this context, objective present work over time effects cropping systems involving management, presence or absence (1981–2011), (1997–2011) stocks along a 0–30 cm silt loam profile at Swift Current, SK. First changes between were apparent five years after start experiment changed in surface 0–7.5 cm layer instead 0–15 cm profiles. This study confirmed accumulation under continuous wheat comparison fallow-wheat rotations, probably related larger systems. Although quite scattered time, seemed be more pronounced than systems, higher no tillage. Then, replacement fallow phase by offered promising potential rebuild stock even if its efficacy might depend initial content and/or combination reduction. Finally, kind equilibrium could set from traditional rotation, dynamics highly influenced precipitation regime all accumulated for decades lost few (less study). Indeed, semi-arid prairie, decomposition exceeded that biomass inputs.