A long-term(19-year) fertilization experiment was conducted to study the effects of different fertilization system on soil carbon stock and fractions.The results showed that effect of different long-term fertilization on soil carbon stock and fractions was significant.Contents of soil total organic carbon(TOC) in different fertilizations decreased in an order of combined manure and inorganic fertilizer(average 12.34 g/kg)>single organic fertilizer(average 12.15 g/kg)>no fertilizer(average 10.56 g/kg)>single...