Analysis on the Soil Carbon Sequestration Potential under the Ecological Agriculture Mode: a Case Study of the Winter Wheat-Summer Corn Rotation System of Hongyi Organic Farm

Abstract

Under the premise of guaranteeing the non-decrease even increase the food production, the application of eco-agriculture can not only improve the ecological environment of the farmland, but also reduce greenhouse gas emissions and create more job opportunities for the farmers. According to the thought of "Chicken farming in the North, livestock rising in the South", we breed beef cattle in a typical north village and successfully tackle the crop residues burning and excessive chemical fertilizer using problems and enhance the carbon storage in the soil. The dynamic changes of organic matter, total nitrogen, and C/N were observed in the winter wheat-summer corn crop rotation system with different fertilization strategies. The results show that, compared with NPK treatment in 0~20 cm non-plough layer, organic matter contents were elevated by 43.8%, 35.4% and 13.1% for M, MNPK1, MNPK2 treatments, respectively. Total nitrogen contents also increased by 25.0%, 21.2%and 12.0%, respectively. The C/N were 7.90~11.34, 7.80~10.85, 7.80~10.93, and 7.04~10.43, respectively for NPK, M, MNPK1, and MNPK2. This study can provide theoretical basis for crop residues/straw utilization, decreasing chemical fertilizer application, and fixing carbon in plow land in eco-agriculture system.