湖北省油菜测土配方施肥下N2O减排潜力估算

以油菜种植大省-湖北省为案例地,在分析农田氮肥施用与油菜籽产量的基础上,依据氮肥利用率变化,估算测土配方施肥技术在湖北省全面推广的情况下,带来的N2O减排潜力.结果表明,在湖北省油菜种植中,测土配方施肥技术的推广将带来646.32ktCO2-eq的理论减排.以2012年湖北省油菜测土配方推广情况为基础,进一步全面实施该项技术,将产生173.91ktCO2-eq的减排量,占油菜种植因氮肥使用而产生的N2O排放总量的13.98%.测土配方施肥通过优化营养元素配比,提高油菜氮肥利用效率,是一项控制与减少农业N2O排放、减少氮素在环境中盈余量的有效措施.

Estimation of N2O mitigation potential from rape planting through soil testing and formulated fertilization in Hubei Province

Based on the relationship between nitrogen fertilizer and the production of rapeseed and the changes of nitrogen use efficiency, this study estimates N2O mitigation potential from rape planting through soil testing and formulated fertilization in Hubei Province. The application of soil testing and formulated fertilization will bring theoretically 646.32kt CO2-eq emission reductions in Hubei Province. Based on the current status of soil testing and formulated fertilization in rape planting, the extensive applications of this measure will produce 173.91kt CO2-eq reduction, accounting for 13.98% of total N2O emission caused by nitrogen fertilizer from rape planting. The measure improves the nitrogen use efficiency by balancing the nutrient supply, thereby reduces the corresponding N2O emission. Therefore, soil testing and formulated fertilization is an effective means to mitigate agricultural N2O emissions, and reduce surplus capacity of nitrogen in environment.