Retention of deposited ammonium and nitrate and its impact on the global forest carbon sink

Geshere Abdisa Gurmesa, Ang Wang, Shanlong Li, Shushi Peng (), Wim Vries, Per Gundersen, Philippe Ciais, Oliver L. Phillips, Erik A. Hobbie, Weixing Zhu, Knute Nadelhoffer, Yi Xi, Edith Bai, Tao Sun, Dexiang Chen, Wenjun Zhou, Yiping Zhang, Yingrong Guo, Jiaojun Zhu, Lei Duan, Dejun Li, Keisuke Koba, Enzai Du, Guoyi Zhou, Xingguo Han, Shijie Han and Yunting Fang ()
Additional contact information
Geshere Abdisa Gurmesa: Chinese Academy of Sciences
Ang Wang: Chinese Academy of Sciences
Shanlong Li: Chinese Academy of Sciences
Shushi Peng: Peking University
Wim Vries: Wageningen University and Research, Environmental Systems Analysis Group
Per Gundersen: University of Copenhagen
Philippe Ciais: LSCE (CEA CNRS UVSQ UPSaclay) Centre d’Etudes Orme des Merisiers
Oliver L. Phillips: University of Leeds
Erik A. Hobbie: University of New Hampshire
Weixing Zhu: Binghamton University, The State University of New York
Knute Nadelhoffer: University of Michigan
Yi Xi: Peking University
Edith Bai: Northeast Normal University
Tao Sun: Chinese Academy of Sciences
Dexiang Chen: Chinese Academy of Forestry
Wenjun Zhou: Chinese Academy of Sciences
Yiping Zhang: Chinese Academy of Sciences
Yingrong Guo: Jiangxi Provincial Bureau of Forestry
Jiaojun Zhu: Chinese Academy of Sciences
Lei Duan: Tsinghua University
Dejun Li: Chinese Academy of Sciences
Keisuke Koba: Kyoto University
Enzai Du: Beijing Normal University
Guoyi Zhou: Nanjing University of Information Science and Technology
Xingguo Han: Chinese Academy of Sciences
Shijie Han: Henan University
Yunting Fang: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The impacts of enhanced nitrogen (N) deposition on the global forest carbon (C) sink and other ecosystem services may depend on whether N is deposited in reduced (mainly as ammonium) or oxidized forms (mainly as nitrate) and the subsequent fate of each. However, the fates of the two key reactive N forms and their contributions to forest C sinks are unclear. Here, we analyze results from 13 ecosystem-scale paired 15N-labelling experiments in temperate, subtropical, and tropical forests. Results show that total ecosystem N retention is similar for ammonium and nitrate, but plants take up more labelled nitrate ( $${20}_{15}^{25}$$ 20 15 25 %) ( $${{{{{{\rm{mean}}}}}}}_{{{{{{\rm{minimum}}}}}}}^{{{{{{\rm{maximum}}}}}}}$$ mean minimum maximum ) than ammonium ( $${12}_{8}^{16}$$ 12 8 16 %) while soils retain more ammonium ( $${57}_{49}^{65}$$ 57 49 65 %) than nitrate ( $${46}_{32}^{59}$$ 46 32 59 %). We estimate that the N deposition-induced C sink in forests in the 2010s is $${0.72}_{0.49}^{0.96}$$ 0.72 0.49 0.96 Pg C yr−1, higher than previous estimates because of a larger role for oxidized N and greater rates of global N deposition.

Date: 2022
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DOI: 10.1038/s41467-022-28345-1

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