Carbon and nitrogen forms in soil organic matter influenced by incorporated wheat and corn residues

摘要: ABSTRACTWe have investigated molecular-scale changes in soil organic matter (SOM) as incorporated wheat and corn residues decompose whether those are correlated with nitrogen forms. The ‘initial litter quality hypothesis’ that compositional variations plant may persist during decomposition of these they transformed to SOM was tested. We studied soils 6-year field experiments a double-cropped corn–wheat rotation system designed the following treatments: no crop residue chemical fertilizer, fertilizer alone, straw + chemical stover + chemical plus residue + chemical fertilizer. Organic carbon forms were assessed, structures examined by Fourier transform infrared solid-state nuclear magnetic resonance spectroscopy. found concentrations organic-N treatment significantly larger than straw ...