Effects of Long-term Fertilizations on Soil Organic Carbon Balance in Paddy Soil from Yellow Earth
To estimate the effects of long-term fertilization on variation of soil organic carbon balance and discuss fertility maintaining mode for sustainable land use,the paddy soil from yellow earthtreated with 10 fertilizations(CK,1/4M + 3/4NPK,1/2M + 1/2NPK,M,NPKM,NPK,NK,N,NP,PK) were sampled from 2006 to 2011,and the soil organic carbon balance was analyzed.Results showed that the soil organic carbon content in manure treatments increased significantly compared to the CK treatment.The soil organic carbon content increased with the amount of manure fertilizer added,which reached a maximum in the NPKM treatment.Soil organic balance varied among different treatments,positive value was observed in treatments of 1/2M + 1/2NPK,M and MNPK,while negative value was observed in other treatments.Positive linear correlation was observed between the soil organic balance and carbon input.2.7 t/hm2 · a carbon was needed to keep the paddy soil organic carbon balance.We concluded that organic carbon in paddy soil from yellow earth remained unsaturated and had the potential to sequester more carbon.Manure fertilizer application,especially the combination of manure fertilizer and chemical fertilizer,could increase soil organic carbon.
Paddy soil from yellow earthLong-term fertilizationSoil organic carbon balanceCarbon input
NETL
NSTL
万方数据
维普
