Summary
Liu et al. assembled a substantially complete global dataset of agricultural ammonia emissions over nearly four decades to evaluate how these emissions contribute to nitrogen deposition patterns worldwide. The analysis reveals that reduced nitrogen deposition from agricultural sources has grown substantially and will increasingly dominate total nitrogen deposition without future regulatory action. The findings underscore the importance of recognising agricultural ammonia as a major driver of nitrogen pollution and inform policy formulation for ecosystem protection.
Regional applicability
The study's global assessment of ammonia emission trends and nitrogen deposition patterns is relevant to UK agricultural policy and environmental management, particularly given the UK's intensive livestock and arable sectors. However, country-specific ammonia mitigation strategies would require disaggregated analysis of UK emission sources and regional deposition patterns.
Key measures
Agricultural ammonia emissions (by region and time period); reduced nitrogen deposition; spatial-temporal patterns of nitrogen deposition; relative contribution of ammonia to total nitrogen deposition
Outcomes reported
The study developed a comprehensive agricultural ammonia emissions dataset spanning four decades and quantified the spatial and temporal patterns of reduced nitrogen deposition globally. It evaluated the relative contribution of agricultural ammonia to total nitrogen deposition and projected future trends without mitigation interventions.
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