Emission Characteristics, Transformation Mechanism, and Reduction Potential of Ammonia Emissions from a Crop Rotation System in Yangtze River Delta

• Published in: Huanjing kexue Vol. 43; no. 2; p. 1108
• Main Authors: Xu, Chang, Miao, Wen-Liang, Ni, Yuan-Zhi, Shen, Gen-Xiang, Qian, Xiao-Yong, Fu, Kan, Gao, Zong-Yuan, Wang, Zhen-Qi
• Format: Journal Article
• Language: Chinese
• Published: China 08.02.2022
• Subjects: Agriculture; Ammonia; China; Crop Production; Fertilizers - analysis; Nitrogen - analysis; Nitrous Oxide - analysis; Oryza; Rivers; Soil; China; Yangtze River Delta; rice shrimp cultivation; transformation mechanism; ammonia emission; reduction potential; emission factor; ammonia conversion rate; emission inventory; emission reduction path; rice/winter wheat rotation
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.202105291

To study the characteristics and reduction potential of the ammonia emissions of a crop rotation system in the Yangtze River Delta, we monitored and compared the ammonia fluxes from two rotation systems:a conventional rice/winter wheat rotation system and a rice-shrimp cultivation/Chinese milk vetch rotation system. This study was conducted through closing chamber methods to investigate the influencing factors and transformation mechanism of ammonium emissions between the two studied cultivation patterns. Additionally, we established the temporal-spatial emission inventory by sorting out the local ammonia emission factors of farmland in the Yangtze River Delta in the last ten years. The emission reduction effects under different ammonia emission reduction paths were also obtained. The results showed that, the cumulative amount of ammonia emissions throughout the whole monitoring year for the conventional rice/winter wheat rotation system (CR-W) and the rice-shrimp cultivation/Chinese milk vetch rotation syste