Utilizing the LCA matrix, we preliminarily analyzed whether wheat-maize rotation system was a carbon sink or a source based on long-term and large-scale straw return in Huantai county. The results indicated that the mode was a carbon source if we comprehensively considered agricultural materials production subsystem and farming subsystem together, with the quantity of net GHGs being -1075.71kgCO2e when producing 1 ton of wheat and maize. But if only farming system was considered, the averaged quantity of cropland carbon sequestration was +262.31 kgCO2e, which could offset the -222.99 kgCO2e carbon emission caused by fertilizes and agricultural machine. Therefore, through straw return and tillage system improvement, farming system might become the carbon sink in the future.
Shaojun, B., Long, L., & Xun, M. (2011). A Study on the Net Greenhouse Gas Emissions under Intensive High-yielding Cropland in North China-A Case Study of Winter Wheat-Summer Maize Rotation System in Huantai County. Energy Procedia, 5, 785–792. https://doi.org/10.1016/j.egypro.2011.03.138