2007 Annual Report 1a.Objectives (from AD-416) a.) Evaluate use of biogeochemical models for mappling baseline soil carbon sequestration and optimizing soil and crop management practices to enhance long term soil carbon sequestration. b.) Utilize remotely sensed data and products from NASA for developing above ground vegetation parameters, crop residue and cultivation practices over regional scales. c.) Develop a Decision Support System (DSS) for carbon accounting to define a standardize scheme for a reliable, cost-effective routine method for changes in soil carbon. 1b.Approach (from AD-416) a. Development of data base of soil classification (STATSGO), historic climatic data, crop statistics, soil carbon experimental data and MODIS imagery for the 9 state area. b. Classification of crop and Landuse in the study region. c. Soil carbon sequestration model validation and development of a DSS. d. Model application and development of web-based DSS for users. e. Accuracy assessment and implementation for users. 3.Progress Report This report documents the research conducted under a reimbursable between ARS and the National Aeronautics and Space Administration. Additional details of the research can be found in the report for the parent project 1265-13610-027-00D, "Using remote sensing and modeling for evaluating hydrologic fluxes, states, and constituent transport processes within agricultural landscapes." There is a need for a decision support system (DSS) for carbon management at regional scales to optimize farming practices for crop yields and carbon sequestration. Initiated development of the database for a selected area across the U.S. Corn Belt to run model simulations of soil carbon sequestration. The National Resource Conservation Service (NRCS-USDA) will partner in the development and utilization the DSS tools and will be the primary end user of this application.