College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
Key Laboratory of Plant-Soil Interactions of Ministry of Education, Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, China Agricultural University, Beijing 100193, China.
Proc Natl Acad Sci U S A. 2023 Apr 25;120(17):e2221459120. doi: 10.1073/pnas.2221459120. Epub 2023 Apr 17.
Growing population and consumption pose unprecedented demands on food production. However, ammonia emissions mainly from food systems increase oceanic nitrogen deposition contributing to eutrophication. Here, we developed a long-term oceanic nitrogen deposition dataset (1970 to 2018) with updated ammonia emissions from food systems, evaluated the impact of ammonia emissions on oceanic nitrogen deposition patterns, and discussed the potential impact of nitrogen fertilizer overuse. Based on the chemical transport modeling approach, oceanic ammonia-related nitrogen deposition increased by 89% globally between 1970 and 2018, and now, it exceeds oxidized nitrogen deposition by over 20% in coastal regions including China Sea, India Coastal, and Northeastern Atlantic Shelves. Approximately 38% of agricultural nitrogen fertilizer was excessive, which corresponds to 15% of global oceanic ammonia-related nitrogen deposition. Policymakers and water quality managers need to pay increasingly more attention to ammonia associated with food production if the goal of reducing coastal nitrogen pollution is to be achieved for Sustainable Development Goals.
不断增长的人口和消费对粮食生产提出了前所未有的要求。然而，主要来自食品系统的氨排放增加了海洋氮沉积，导致富营养化。在这里，我们开发了一个长期的海洋氮沉积数据集（1970 年至 2018 年），其中更新了食品系统的氨排放量，评估了氨排放对海洋氮沉积模式的影响，并讨论了氮肥过度使用的潜在影响。基于化学输送建模方法，1970 年至 2018 年间，全球海洋氨相关氮沉积增加了 89%，现在，在中国海、印度沿海和东北大西洋大陆架等沿海地区，海洋氨相关氮沉积已经超过了氧化氮沉积的 20%。大约 38%的农业氮肥是过剩的，这相当于全球海洋氨相关氮沉积的 15%。如果要实现可持续发展目标中减少沿海氮污染的目标，政策制定者和水质管理者需要更加关注与食品生产相关的氨。
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