Carbon and nitrogen mineralization patterns of two contrasting crop residues in a Mollisol: Effects of residue type and placement in soils

摘要: Predicting carbon (C) mineralization of crop residues returned to soils is important for forecasting dioxide (CO2) emissions into the atmosphere and soil nitrogen (N) availability. In this study, a laboratory incubation experiment was conducted investigate C soybean (Glycine max), maize (Zea mays), their mixture placed on surface incorporated in Mollisol northeast China. Both residue type placement significantly affected N mineralization, while no significant interactions between them were observed cumulative mineralization. The had higher decomposition rate than regardless placements; rates both those same soils. Moreover, non-additive effects contribution each not observed. Our results suggest that with low concentration high C/N ratio (such as maize) can be immobilize decrease CO2 comparison surface.