1. Key Laboratory of Green and Low-carbon Agriculture in Southeastern China, Ministry of Agriculture and Rural Affairs, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China 2. Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China
● Gaseous N emissions from orchards, vegetables and tea plantations (OVT) are reviewed.
● Gaseous N emissions from OVT are greater in China than the rest of the world.
● OVT are hotspots for gaseous N emissions from the agricultural sector in China.
Nitrogen fertilizer application has accelerated the agricultural soil N cycle while ensuring food security. Gaseous reactive N emissions from orchards, vegetables and tea plantations (OVT) are less understood than those from cereal crops. This paper presents a compilation of data on soil ammonia, nitrous oxide, and nitric oxide emissions from 1454 OVT systems at 184 unique experimental locations worldwide aiming to investigate their emission characteristics, emission factors (EF), and contribution to total farmland emissions. NH3 and N2O emissions from orchards and N2O and NO emissions from vegetable production were significantly higher in China than in the rest of the world, regardless of fertilizer application, while N2O emissions from tea plantations were lower than for vegetables. The EF of NH3 for vegetables was close to the global mean value with urea application but significantly higher than that of orchards. The EF of N2O in orchards and vegetables was comparable to the global median value, while in tea plantations, the value was 2.3 times higher than the global median value. Current estimates suggest that direct emissions of NH3, N2O, and NO from OVT systems are equivalent to approximately a quarter, two thirds and a half of the total farmland in China, respectively. Future research needs to strengthen observational field studies in establishing standard sampling methods for gaseous N emissions and implementing knowledge-based management measures to help achieve the green development of agriculture.
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