Magnitude,distribution and temporal trend of nitrous oxide emissions from China's natural soils over 1980–2022  

作　　者：Songbai HONG Zimeng LI Mingsong TANG Fa LI Yitong YAO Yanzi YAN Mingzhu HE Xuhui WANG Hui ZENG Shilong PIAO 

机构地区：[1]School of Urban Planning and Design,Shenzhen Graduate School,Peking University,Shenzhen,518055,China [2]Key Laboratory of Earth Surface System and Human-Earth Relations,Ministry of Natural Resources of China,Shenzhen Graduate School,Peking University,Shenzhen,518055,China [3]Institute of Carbon Neutrality,Sino-French Institute for Earth System Science,College of Urban and Environmental Sciences,Peking University,Beijing,100871,China [4]Department of Earth System Science,Stanford University,Stanford,CA,94305,USA [5]Division of Geological and Planetary Sciences,California Institute of Technology,Pasadena,CA,91125,USA [6]Department of Soil and Environment,Swedish University of Agricultural Sciences,Uppsala,75007,Sweden [7]Joint International Research Laboratory of Catastrophe Simulation and Systemic Risk Governance,Beijing Normal University,Zhuhai,519087,China [8]School of National Safety and Emergency Management,Beijing Normal University,Zhuhai,519807,China

出　　处：《Science China Earth Sciences》2025年第4期1074-1085,共12页中国科学(地球科学英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.42471116 and 41988101)。

摘　　要：Soils represent the largest contributor to global nitrous oxide(N_(2)O)emissions.However,current research efforts predominantly focus on N_(2)O emissions from agricultural soils,while studies on N_(2)O emissions from natural soils,another significant source,remain limited.In this study,we explored the magnitude,spatiotemporal dynamics,and drivers of N_(2)O emissions from China's natural soils over the period 1980–2022 via machine learning and a compiled novel dataset of 319 field observations.Our results revealed that the N_(2)O flux per unit area was generally higher in the southeast compared to the northwest,and higher in forests than in grasslands.This spatial and biome heterogeneity was strongly regulated by local hydrothermal conditions and nitrogen availability.The averaged N_(2)O emissions over the study period were 646.2±27 Gg N_(2)O yr^(-1),with approximately equivalent contributions from forests and grasslands.Moreover,there exhibited a significant and increasing trend from 1980 to 2022,with a rate of 2.7 Gg N_(2)O yr^(-2).Such an increase was primarily driven by the expansion of forested area and elevated nitrogen deposition.Our data-driven study presents a long-term and gridded estimate of N_(2)O emissions from China's natural soils,emphasizing the need for future research on changes of greenhouse gas emissions induced by land use change and nitrogen deposition.

关 键 词：Nitrous oxide Spatiotemporal dynamics Nitrogen deposition FORESTS Grasslands Data-driven estimates 

分 类 号：S15[农业科学—土壤学]