Greenhouse gas emissions and mitigation potential of crop production in Northeast China

IF 4.5 1区 农林科学 Q1 AGRONOMY European Journal of Agronomy Pub Date : 2024-10-05 DOI:10.1016/j.eja.2024.127371
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Abstract

Agricultural management practices that reduce greenhouse gas (GHG) emissions have been identified as effective mitigation strategies. However, research on carbon emissions from major crops in Northeast China focuses on national and provincial data, overlooking city-scale variability and uncertainties, which prevents fine-scale assessment of crop emissions reduction potential. To address this, a life cycle assessment (LCA) combined with the Monte Carlo method was conducted to estimate the carbon footprint of rice, maize, and soybean production for different cities in Northeast China from 1991 to 2020. The results showed that the top one-third of cities with the highest total carbon emissions (TCE) account for approximately 40 % of the region's TCE. Nitrogen losses and production processes related to nitrogen fertilizer application were identified as the primary contributors to TCE from crop production, accounting for 29.6–62.5 % of the total, with a relative importance of 58.5–78.2 %. Scenario analysis indicated that optimizing nitrogen fertilizer management and reducing active nitrogen losses are the most effective strategies for reducing TCE from major crop production, offering a reduction potential of 34.5–60.6 %. Recommended strategies include phased application of nitrogen fertilizer, the addition of nitrification inhibitors, or using slow-release nitrogen fertilizers, combined with appropriate increases in crop planting density, straw return decomposition technologies and water-saving irrigation methods to reduce GHG emissions. These strategies aim to achieve low-carbon sustainable grain production and provide a foundation for exploring the emissions reduction potential of agricultural inputs and optimizing regional crop layouts, offering new insights for developing more effective GHG reduction strategies.
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中国东北地区农作物生产的温室气体排放与减排潜力
减少温室气体(GHG)排放的农业管理措施已被确定为有效的减排战略。然而,有关中国东北地区主要农作物碳排放的研究主要集中在国家和省级数据上,忽略了城市尺度的变化和不确定性,从而无法对农作物的减排潜力进行精细评估。针对这一问题,研究人员结合蒙特卡洛法进行了生命周期评估,估算了 1991 至 2020 年中国东北地区不同城市水稻、玉米和大豆生产的碳足迹。结果表明,碳排放总量(TCE)最高的前三分之一城市约占该地区 TCE 的 40%。与氮肥施用相关的氮素损失和生产过程被认为是农作物生产产生的 TCE 的主要贡献者,占总量的 29.6-62.5%,相对重要性为 58.5-78.2%。情景分析表明,优化氮肥管理和减少活性氮损失是减少主要作物生产中产生的三氯乙酸的最有效策略,减排潜力为 34.5-60.6%。建议的策略包括分阶段施用氮肥、添加硝化抑制剂或使用缓释氮肥,同时适当增加作物种植密度、采用秸秆还田分解技术和节水灌溉方法,以减少温室气体排放。这些战略旨在实现低碳可持续粮食生产,为探索农业投入的减排潜力和优化区域作物布局奠定了基础,为制定更有效的温室气体减排战略提供了新的思路。
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来源期刊
European Journal of Agronomy
European Journal of Agronomy 农林科学-农艺学
CiteScore
8.30
自引率
7.70%
发文量
187
审稿时长
4.5 months
期刊介绍: The European Journal of Agronomy, the official journal of the European Society for Agronomy, publishes original research papers reporting experimental and theoretical contributions to field-based agronomy and crop science. The journal will consider research at the field level for agricultural, horticultural and tree crops, that uses comprehensive and explanatory approaches. The EJA covers the following topics: crop physiology crop production and management including irrigation, fertilization and soil management agroclimatology and modelling plant-soil relationships crop quality and post-harvest physiology farming and cropping systems agroecosystems and the environment crop-weed interactions and management organic farming horticultural crops papers from the European Society for Agronomy bi-annual meetings In determining the suitability of submitted articles for publication, particular scrutiny is placed on the degree of novelty and significance of the research and the extent to which it adds to existing knowledge in agronomy.
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