土壤基础地力影响春玉米施肥的农学与环境效益

The Impacts of Indigenous Soil Productivity on Spring Maize Agronomic and Environmental Benefits Responses to Chemical Fertilizers Application

  • 摘要:
    目的 明确土壤基础地力对春玉米施肥后农学和环境效益的影响,为东北玉米产区土壤培肥与可持续生产提供依据。
    方法 基于2005 ~ 2013年在吉林省开展的680个田间试验,选取不施肥(CK)、氮磷钾肥配施(NPK)、不施氮(-N)、不施磷(-P)和不施钾(-K)5个处理,以CK处理的玉米产量作为土壤基础地力分级标准,研究不同土壤基础地力条件下玉米产量、施肥效果、养分利用率及环境效益的变化规律。
    结果 NPK处理玉米产量随土壤基础地力增加呈持续上升趋势,土壤基础地力产量每增加1 t hm−2,NPK处理玉米产量增加0.73 t hm−2。同时,土壤基础地力提升也显著增加土壤基础地力对产量的贡献率,而肥料的产量贡献率和施肥农学效率则逐渐降低。边界线分析表明,土壤基础地力产量达到7.87 t hm−2时,NPK处理的最高产量可稳定在15.9 t hm−2水平。土壤基础地力的提升缩小了NPK处理玉米产量与玉米最高产量之间的差距,提高了产量稳定性和可持续性。环境效益方面,NPK处理玉米生产中单位面积的活性氮总损失量和富营养化潜值随土壤基础地力提升呈下降趋势,温室气体排放量先升后降,而酸化潜值有所提高。由单位玉米产量计算得出的环境足迹 / 强度结果显示,氮足迹、碳足迹、富营养化强度和酸化强度与土壤基础地力均呈显著负相关关系,土壤基础地力玉米产量每增加1 t hm−2,以上四项指标分别下降0.57 kg N t−1、19.88 kg CO2 eq t−1、0.24 kg PO4 eq t−1和0.57 kg SO2 eq t−1
    结论 增加土壤基础地力可协同提升春玉米施肥的农学与环境效益。建议通过合理耕作与优化施肥等措施进一步改良土壤、提高基础生产力,为协同实现春玉米单产提升与绿色可持续生产的目标提供重要支撑。

     

    Abstract:
    Objective The aims were to Clarify the impacts of indigenous soil productivity on the agronomic and environmental benefits responses to chemical fertilizers application in spring maize production, in order to provide a basis for soil fertility improvement and sustainable production in the maize-producing regions of Northeast China.
    Method Based on 680 field experiments conducted in Jilin Province from 2005 to 2013, the treatments, including no fertilization (CK), nitrogen-phosphorus-potassium application (NPK), no nitrogen (-N), no phosphorus (-P), and no potassium (-K), were selected. The CK yield was used as the standard for classifying indigenous soil productivity to investigate the variation in maize yield, fertilization effects, nutrient use efficiency, and environmental benefits under different levels of indigenous soil productivity.
    Result The maize yield of NPK treatment showed a continuous upward trend with the increase in indigenous soil productivity. For every 1 t hm−2 increase in indigenous soil productivity, maize yield of NPK treatment increased by 0.73 t hm−2. Meanwhile, an improvement in indigenous soil productivity also significantly enhanced the contribution rate of soil productivity to the yield, while the contribution rate of fertilizers to the yield and the agronomic efficiency of fertilization gradually decreased. Boundary line analysis indicated that when indigenous soil productivity reached 7.87 t hm−2, the maize yield of NPK treatment could achieve a maximum yield of 15.9 t hm−2. Enhancing indigenous soil productivity reduced the gap between yield of NPK treatment and maximum yield, improving yield stability and sustainability. In terms of environmental benefits, for maize production under the NPK treatment, total reactive nitrogen loss per unit area and eutrophication potential value decreased with increasing indigenous soil productivity, whereas greenhouse gas emissions initially increased and then declined, and acidification potential value gradually intensified. Indigenous soil productivity exhibited a significant negative correlation with environmental footprint and intensity based on unit maize yield. For every 1 t hm−2 increase in indigenous soil productivity, nitrogen footprint, carbon footprint, eutrophication intensity, and acidification intensity decreased by 0.57 kg N t−1, 19.88 kg CO2 eq t−1, 0.24 kg PO4 eq t−1, and 0.57 kg SO2 eq t−1, respectively.
    Conclusion Enhancing indigenous soil productivity promotes high and stable yields of maize under balanced fertilization conditions, while simultaneously achieving emission reduction and efficiency improvement. It is recommended to further improve the soil and boost its basic productivity through measures such as rational tillage and optimized fertilization, thus providing crucial support for the coordinated realization of increasing spring maize yield and sustainable production.

     

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