Effects of Biochar on Organic Carbon Mineralization and Carbon Dioxide Emission from Paddy Soil in Guanzhong Area

A waterlogged soil environment was simulated and the effects of biochar addition and different amendments on soil organic carbon mineralization and carbon dioxide release were analyzed by adding with mass fraction of 0,2%,5%,8%biochar to paddy soil,which in order to provide scientific basis for comprehensive evaluation of carbon emissions from field ecosystem and its reduction measures in our country.Results showed that biochar amendments improved the stabilization of soil carbon pools and decreased the mineralization rate of soil organic carbon observably.A reduction of 10%,6% respectively in soil organic carbon mineralization was presented by biochar addition of 5% and 8% when compared to the control,and it was different for various biochar amendments in decreasing soil organic mineralization.Carbon dioxide emissions from flooded paddy soils fed with biochar were inhibited significantly,with extension of waterlogging time,carbon dioxide effluxes from flooded paddy soils were increased slowly,but there was no significant difference between 2%,5%and 8% biochar amendments for the results of soil temperature and organic matter change(P0.05).