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Soil nitrogen substrates determine global N2O emission more than climate and other soil properties
  • +12
  • Zhaolei Li,
  • Zhaoqi Zeng,
  • Dashuan Tian,
  • Jilin Yang,
  • Junxiao Pan,
  • Cheng Meng,
  • Song Wang,
  • Yingjie Yan,
  • Xingzhao Huang,
  • Enqing Hou,
  • Sheng Nie,
  • Zhaopeng Song,
  • Lifen Jiang,
  • Yiqi Luo,
  • Shuli Niu
Zhaolei Li
Chinese Academy of Sciences
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Zhaoqi Zeng
Chinese Academy of Sciences
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Dashuan Tian
Institute of Geographic Sciences and Natural Resources Research, CAS
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Jilin Yang
Chinese Academy of Sciences
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Junxiao Pan
Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences
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Cheng Meng
Chinese Academy of Sciences
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Song Wang
Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences
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Yingjie Yan
Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences
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Xingzhao Huang
Anhui Agricultural University
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Enqing Hou
Northern Arizona University Center for Ecosystem Science and Society
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Sheng Nie
Chinese Academy of Sciences Aerospace Information Research Institute
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Zhaopeng Song
Beijing Forestry University
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Lifen Jiang
Northern Arizona University
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Yiqi Luo
Northern Arizona University
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Shuli Niu
Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences
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Abstract

Accurate estimation of N2O emission is one of the primary objectives to project the warming potential. However, the global patterns and main controlling factors of soil N2O emission remain elusive. We compiled a dataset with 6016 field observations from 219 articles and found that the averaged soil N2O emission rate was 1111.8 ± 26.59 µg N m-2 day-1. Soil N2O emission rates were significantly influenced by climatic factors (i.e. mean annual temperature), soil physical and chemical properties (e.g. pH, nitrate, ammonium, and total nitrogen), and microbial traits (microbial biomass nitrogen) at a global scale. The combined direct effects of soil nitrate, ammonium, and total nitrogen (combined standard coefficient = 0.45) accounted for the most variance of global soil N2O emissions (total standard coefficient = 0.84). This study highlights the critical roles of soil nitrogen substrates on N2O emission, which will be helpful to optimize the process-models on soil N2O emissions.