Liang Minqi, Zhou Zheyan, Ren Peiyang, Xiao Han, Hu Zhongmin, Piao Shilong, Tian Hanqin, Tong Qing, Zhou Feng, Wei Jing, Yuan Wenping
School of Atmospheric Sciences, Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon Cycle, Sun Yat-sen University, Zhuhai 510245, China.
State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China.
Natl Sci Rev. 2023 Nov 6;11(3):nwad285. doi: 10.1093/nsr/nwad285. eCollection 2024 Mar.
China is among the top nitrous oxide (NO)-emitting countries, but existing national inventories do not provide full-scale emissions including both natural and anthropogenic sources. We conducted a four-decade (19802020) of comprehensive quantification of Chinese NO inventory using empirical emission factor method for anthropogenic sources and two up-to-date process-based models for natural sources. Total NO emissions peaked at 2287.4 (1774.82799.9) Gg NO yr in 2018, and agriculture-developed regions, like the East, Northeast, and Central, were the top NO-emitting regions. Agricultural NO emissions have started to decrease after 2016 due to the decline of nitrogen fertilization applications, while, industrial and energetic sources have been dramatically increasing after 2005. NO emissions from agriculture, industry, energy, and waste represented 49.3%, 26.4%, 17.5%, and 6.7% of the anthropogenic emissions in 2020, respectively, which revealed that it is imperative to prioritize NO emission mitigation in agriculture, industry, and energy. Natural NO sources, dominated by forests, have been steadily growing from 317.3 (290.3344.1) Gg NO yr in 1980 to 376.2 (335.5407.2) Gg NO yr in 2020. Our study produces a Full-scale Annual NO dataset in China (FAN2020), providing emergent counting to refine the current national NO inventories.
中国是一氧化二氮（N₂O）排放大国之一，但现有的国家排放清单并未涵盖包括自然源和人为源在内的全面排放情况。我们采用人为源经验排放因子法和两种最新的基于过程的自然源模型，对中国40年（1980—2020年）的N₂O排放清单进行了全面量化。N₂O排放总量在2018年达到峰值2287.4（1774.8—2799.9）Gg N₂O/年，东部、东北和中部等农业发达地区是N₂O排放最多的地区。由于氮肥施用量下降，2016年后农业N₂O排放开始减少，而工业和能源源排放自2005年后急剧增加。2020年，农业、工业、能源和废弃物的N₂O排放分别占人为排放的49.3%、26.4%、17.5%和6.7%，这表明必须优先减少农业、工业和能源领域的N₂O排放。以森林为主的自然N₂O源已从1980年的317.3（290.3—344.1）Gg N₂O/年稳步增长至2020年的376.2（335.5—407.2）Gg N₂O/年。我们的研究生成了中国全尺度年度N₂O数据集（FAN2020），为完善当前国家N₂O排放清单提供了重要数据。
