The long-term field experiment was carried out to evaluate soil enzyme activities and soil respiration with the different fertilizer treatments in farmland soil at the Key Observation Station of the Harbin Black Soil Ecology,Ministry of Agriculture,Heilongjiang Province,China.The results showed that the soil enzyme activities(catalase,invertase and urease) had significant difference among fertilization treatments regardless of sampling time.The urease and invertase activities of organic and inorganic fertil...