Based on biological adaptability and material-energy flow balancing in ecosystem, an integrated approach was developed to assess'the potential productivity and population carryiny capacity of agro-ecosystem in China.With a model, the China's agro-ecosystem was divided into three structural ui its (farmland, grassland and animal busban-dary) and 601 regional units, and the potential primary productivity, secondary productivity and population carrying capacity were evaluated. The major results are presented a...