The presence of soybean, but not soybean cropping frequency has influence on SOM priming in crop rotation systems

Legume crops are advocated for integration into crop rotation systems, and cereal-based rotations with the presence of legumes have a substantial effect on improving soil fertility health. It is not yet clear whether frequency legume inclusion in systems influences biochemical properties organic matter (SOM) mineralization. An incubation experiment was conducted 13C-glucose addition to evaluate soybean (Glycine max L.) cropping SOM mineralization under long-term wheat (Triticum aestivum L.)- maize (Zea mays L.)-based systems. Phospholipid fatty acids (PLFAs) 13C-PLFAs were measured explore microbial biomass, community structure utilization glucose Glucose increased native mineralization, i.e. positive priming effect. Compared less wheat- maize-based wheat-soybean-soybean-soybean maize-soybean-soybean total biomass (PLFAs), fungal decreased ratio bacteria fungi. Furthermore, fungi negatively correlated PE intensity, indicating that greater played key role stimulating priming. That proportion G- had relationship intensity also supported this conclusion. The priming, while no significant influence However, contrast system, same wheat-based system lower C/N higher B/F ratio, resulted intensity. Our findings indicated because induced more than addition.