滴灌下肥料管理对小麦产量和碳氮足迹的影响

    Effects of fertilizer management on wheat yield, carbon and nitrogen footprint under drip irrigation

    • 摘要: 为解决小麦生产中氮肥投入过量及灌溉不合理问题,提出华北平原小麦绿色高产生产技术,为农业可持续发展提供支撑。该试验以冬小麦为研究对象,设置滴灌不施肥(D-0)、滴灌不施氮肥(D-N0)、畦灌常规施肥(Q-FP)、滴灌优化施肥(D-NPK)、滴灌有机无机配施(D-NPKM)处理,研究不同措施对小麦产量、碳氮足迹及农田净生态经济效益的影响。结果表明:氮肥和灌溉方式是小麦产量的关键制约因素,与Q-FP处理相比,同时优化施肥及灌溉方式(D-NPK),小麦产量和收获指数平均分别显著提高12.3%和13.2%,D-NPKM处理可显著提高小麦产量和收获指数16.8%和13.1%。相比于畦灌农户常规施肥,滴灌条件下优化施肥量(D-NPK)及有机无机配施(D-NPKM)是小麦生产系统碳氮排放及环境足迹降低的有效措施,氮足迹分别降低61.7%和59.8%,碳足迹分别降低44.5%和25.3%。滴灌模式下,有机无机配施(D-NPKM)处理氮足迹和碳足迹均高于单施化肥(D-NPK)处理,分别高4.9%和34.6%,而净生态经济效益降低于D-NPK处理24.3%。因此,从小麦生产力角度来看,滴灌结合有机无机配施是最优化措施,但结合生态环境角度,建议D-NPK处理为最优化措施。整体来看,在该研究试验条件下,推荐滴灌结合肥料减量措施作为小麦生产的最优化措施,但相比于农户常规灌溉施肥,滴灌下有机无机配施仍是提高小麦生产力,降低小麦生产碳氮足迹的有效措施,未来可结合不同地区有机肥资源进行综合考虑,选择可进一步降低碳足迹的有机肥类型及施用方式,以最大化资源利用,实现农业可持续发展。

       

      Abstract: In order to salve the problem of excessive nitrogen (N) fertilizer input and unreasonable irrigation in wheat production, put forward the green high-yield production technology of wheat in North China Plain, and provide support for sustainable agricultural development. In this study, winter wheat was selected as the research object, five treatments were carried out: drip irrigation without fertilization (D-0), drip irrigation without nitrogen fertilizer (D-N0), border irrigation and conventional fertilization (Q-FP), drip irrigation and optimized fertilization (D-NPK), organic and inorganic fertilizer combination with drip irrigation (D-NPKM), the effects of different treatments on wheat yield, carbon (C) footprint and N footprint of wheat production were studied. The result indicated that N fertilizer and irrigation modes were the key constraint factor of wheat yield. Compared with Q-FP treatment, optimal fertilization and irrigation method (D-NPK) at the same time significantly increased wheat yield and harvest index by 12.3% and 13.2% on average, respectively, while D-NPKM treatment significantly increased wheat yield and harvest index by 16.8% and 13.1%, respectively. In addition, compared to conventional irrigation and fertilization practices by farmers (Q-FP), optimizing fertilization rate (D-NPK) and applying organic and inorganic fertilizers together (D-NPKM) under drip irrigation conditions were effective measures to reduce C and nitrogen emissions as well as environmental footprints in wheat production systems in this experiment: N footprints decreased by 61.7% and 59.8%, respectively, while C footprints decreased by 44.5% and 25.3%, respectively. Under the drip irrigation model, the N and C footprints of the D-NPKM treatment were higher than those of the D-NPK treatment by 4.9% and 34.6%, respectively, while the net ecological economic benefit of D-NPKM was 24.3% lower than that of D-NPK. Thus, considering from the perspective of wheat productivity, drip irrigation combined with organic and inorganic fertilizer application is the optimal measure. However, considering the ecological environment together, D-NPK treatment is recommended as the optimal approach. In summary, under the conditions of this study, it is recommended to adopt drip irrigation combined with optimized fertilization as the optimal strategy for wheat production. Nevertheless, compared to conventional irrigation and fertilization by farmers, organic and inorganic fertilizer application under drip irrigation remains an effective measure to enhance wheat productivity and reduce C and N footprints in wheat production. Future research could focus on integrating organic fertilizer resources from different regions to identify types and application methods that can further reduce C footprints, thereby maximizing resource utilization and achieving sustainable agricultural development.

       

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