Straw incorporation influences soil organic carbon sequestration, greenhouse gas emission, and crop yields in a Chinese rice (Oryza sativa L.) –wheat (Triticum aestivum L.) cropping system

•Straw incorporation increased soil organic carbon stock.•Various straw incorporation methods had no influence on soil organic carbon stock.•Straw incorporation increased annual methane and nitrous oxide emissions.•Straw incorporation influenced rice yield but not wheat yield.•Straw incorporation increased net global warming potential, with the exception for rice straw incorporation only.