Effect of long-term fertilization on different fractions of organic carbon of Brown soil

The effects of mineral fertilizer and organic manure on soil organic carbon,labile organic carbon and particulate organic carbon were investigated in a long-term fertilizer experiment of agricultural sciences of Jilin Province.The results showed that inorganic fertilizer plus organic manure treatments were beneficial to elevate the soil organic carbon concentration of black soil.The soil dissolved organic carbon and microbial organic carbon differed significantly under different fertilizer treatments,and those of high amount input treatment of inorganic fertilizer plus organic manure were the highest.The long-term inorganic fertilizer treatment lowered the soil particulate organic carbon.The organic manure could elevate the soil organic carbon concentration significantly.