Reductions in the deposition of sulfur and selenium to agricultural soils pose risk of future nutrient deficiencies
Reductions in the deposition of sulfur and selenium to agricultural soils pose risk of future nutrient deficiencies
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DOI：
10.1038/s43247-021-00172-0
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发表时间：
2021-05-26
影响因子：
7.9
通讯作者：
Winkel, Lenny H. E.
中科院分区：
文献类型：
--
作者：
Feinberg, Aryeh;Stenke, Andrea;Winkel, Lenny H. E.
根据大气化学模型预测，向更清洁的燃料过渡和改进污染控制将减少大气中硒和硫向农业土壤的输入，从而增加养分缺乏的风险。大气沉降是农业土壤中硫和硒养分的主要来源。空气污染控制和清洁能源生产减少了硫和硒的人为排放，从而降低了这些元素的大气沉降通量。在这里，我们使用全球气溶胶化学气候模型来绘制近期（2005-2009）硫和硒沉积情况，并预测两种社会经济情景下的未来（2095-2099）变化。在整个北半球，我们发现农业土壤的沉积量大幅减少，硫沉积量减少了 70% 至 90%，硒沉积量减少了 55% 至 80%。美国溪流中硫和硒浓度的最新趋势表明，由于大气供应量下降，这些元素的流域质量平衡已经发生变化。需要制定可持续的肥料管理战略，以抵消大气养分供应的减少，确保未来的粮食安全和营养，同时避免对下游水生生态系统造成影响。
Transition to cleaner fuels and improved pollution control will reduce atmospheric inputs of selenium and sulfur to agricultural soils, which increases the risk of nutrient deficiencies, according to atmospheric chemistry model projections.Atmospheric deposition is a major source of the nutrients sulfur and selenium to agricultural soils. Air pollution control and cleaner energy production have reduced anthropogenic emissions of sulfur and selenium, which has led to lower atmospheric deposition fluxes of these elements. Here, we use a global aerosol-chemistry-climate model to map recent (2005-2009) sulfur and selenium deposition, and project future (2095-2099) changes under two socioeconomic scenarios. Across the Northern Hemisphere, we find substantially decreased deposition to agricultural soils, by 70 to 90% for sulfur and by 55 to 80% for selenium. Recent trends in sulfur and selenium concentrations in USA streams suggest that catchment mass balances of these elements are already changing due to the declining atmospheric supply. Sustainable fertilizer management strategies will need to be developed to offset the decrease in atmospheric nutrient supply and ensure future food security and nutrition, while avoiding consequences for downstream aquatic ecosystems.