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Distinguishing direct N2O emissions from 15N-labeled manure compost, urea, and maize roots in a field study
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2024-05-09 , DOI: 10.1016/j.agrformet.2024.110049 Liting Liu , Zhu Ouyang , Jing Li
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2024-05-09 , DOI: 10.1016/j.agrformet.2024.110049 Liting Liu , Zhu Ouyang , Jing Li
Nitrous oxide (NO) emissions from agricultural activities are a significant contributor to global anthropogenic NO emissions. Sustainable agriculture practices, including using manure compost to replace nitrogen (N) fertilizers, can reduce chemical fertilizer use and minimize negative impacts on soil health and water quality. However, the direct contributions of manure compost to NO emissions have not been fully studied. We conducted a field study to distinguish the direct contributions of manure compost, urea, and residual maize roots to NO emissions in an integrated crop-livestock agricultural system in Shandong Province, China. Using the N-labeling technique, we found that the majority (93.3%) of cumulative NO emissions originated from the soil and other unaccounted sources. Notably, manure compost contributed 1.3%, while current-year urea, residual urea with root exudates, and maize root accounted for 3.4%, 1.9%, and 0.03% of cumulative NO, respectively. Our results also demonstrated that applying manure compost in combination with urea resulted in lower seed yield-scaled NO emissions (0.046 g NO-N kg seed) compared to applying urea alone, even when the total N input was identical, suggesting the potential of manure compost in a more sustainable agriculture model. The low emission factor of manure compost (0.005%) compared to urea (0.019%) supports this potential, indicating the slow-release nature of manure may mitigate NO while maintaining crop yield. Additionally, the overall low emissions may be attributed to the relatively high soil pH (8.17), which influences the denitrification product ratio, favoring the conversion of NO to N. Our study provides valuable insights into the factors contributing to NO emissions in integrated crop-livestock farming systems, and highlights the importance of distinguishing multiple sources of NO emissions to develop effective strategies for reducing emissions while promoting sustainable agriculture.
更新日期：2024-05-09
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