如何利用有机肥提高土壤有机碳含量.ppt

Part two How to use the relationship to maintain and increasing SOC The relations are used to guide the application of manure and straw to maintain or increase SOC Or to improve soil fertility for sustainable agriculture 有机碳变化量 Changed SOC （tC/ha/yr） 年均投入 （t C/ha/yr） C input Maintain C input Principle to use manure to increase SOC Increasing SOC sequestration efficiency of C input 有机质水平 SOC (t/ha/yr) 年均碳投入 （t C/ha/yr） C input Principle to increase SOC: To use the relationship SOC and C input SOC increasing Increasing C input C input to maintain SOC Site Initial SOC (g/kg) C input to maintain SOC ( t C/ha/yr) Manure/ straw needed to maintaining SOC (t/ha/yr) Fresh pig manure Rice straw 祁阳QY 8.6 0.8 18 2.3 遂宁SN 9.2 0.8 16 2.0 武昌WC 15.9 2.2 23 5.4 南昌NC 14.9 2.5 26 5.8 望城WC 19.7 1.4 29 3.6 Site Initial SOC (g/kg) Target SOC (g/kg) C input to increase SOC by 10% ( t C/ha/yr) Manure/ straw needed to increasing SOC by 10% (t/ha/yr) Fresh pig manure Rice straw 祁阳QY 8.6 9.4 1.89 33.5 4.2 遂宁SN 9.2 10.1 1.49 36 3.3 武昌WC 15.9 17.5 3.69 46 8.2 南昌NC 14.9 16.7 3.33 48 7.4 望城WC 19.7 21.7 4.05 60 9 C input to increase SOC by 10% Part Three Further Research On SOC Long-term Exps. Lab. Anal. Short Field Exp. Green house Exp. Model Exp. Simulate SOC by Modified Model SOC Research approachesBased on long-term Exps SOC Research Areas SOC Research 2. SOC Quality and Infuencing Factors 1.Total SOC Evolvement and Sequestration 3.SOC Modeling and estimation 4.Mitigation CO2 and N2O by fertilization Thanks!Welcome to visit China LTEs! * * * * * * How to Use Manure to Increase Soil Carbon Sequestration in Arable Land of China Minggang XU (Institute of Agricultural Resources and Regional Planning, CAAS, China) flow chart of C cycle in agro-ecosystem Soil system: C input: Manure and crop residues C output: CO2 by respiration Factors of SOC stability in cropland Technique to sequestrate C in soil Erosion degradation management improvement plant cover Till Rotation Fertiliza