Effect of supplying C and N on the mineralization and priming effect of organic matter in loessial soil

The mineralization and priming effect of soil organic matter in Raw Loessial Soil(RLS) and Garden Loessial Soil(GLS) were studied using incubation method by adding glucose-14C,straw-14C,NH4-15N,NO3-15N.The results showed that added organic matter,especially the easy decomposing glucose,and added N,especially the NH4-N,could significantly stimulate the mineralization and the priming effect of soil organic matter in RLS and GLS.The mineralization rate of soil organic matter was much higher in GLS than in RLS.However,the rate of the priming effect was lower in GLS than in RLS.The added organic matter combined with N applied into soil,the added N could stimulate the mineralization and the priming effect of added organic matter.The interactions between added organic matter and added N under present experimental systems have been found and observed that the interaction values were positive and were much higher in RLS than in GLS.It is concluded that the priming effect of soil organic matter was benefit for the mineralization of soil organic matter and improvement of soil fertility.