Hierarchical driving factors of ammonia emissions from cropland in China
Abstract
Ammonia (NH3) emissions can have significant impacts on the environment, ecology, and human health, with a key source being fertilizer application in croplands. NH3 emissions from croplands are influenced not only by natural factors but also by human management practices and social factors. However, our current understanding of the mechanisms and driving factors behind these emissions is limited. In this study, we conducted a quantitative analysis of the factors influencing NH3 emissions using data from in-situ experiments and historical emissions data from 1980 to 2020. Our analysis revealed that fertilization management is the most significant contributor, accounting for 47% of NH3 emission flux at the point level. Climate conditions and soil properties contribute 21% and 32%, respectively, to cropland NH3 flux. At the county level, the contributions of management practices and socioeconomic factors such as farm size to NH3 emission factors are nearly equal, with proportions of 51% and 49%, respectively. Advancements in agricultural mechanization and practices focused on reducing fertilizer use can achieve a 29% reduction in NH3 emissions by 2030, all while maintaining rapid socioeconomic development. This highlights a strategy that can improve environmental quality, ensure Chinese grain production security, and deliver significant socioeconomic and ecological benefits.
- Publication:
-
Journal of Cleaner Production
- Pub Date:
- April 2024
- DOI:
- 10.1016/j.jclepro.2024.142127
- Bibcode:
- 2024JCPro.45142127W
- Keywords:
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- Ammonia emissions;
- Cropland;
- Driving factor;
- Socioeconomic factors