Nature communications · 2022
Retention of deposited ammonium and nitrate and its impact on the global forest carbon sink.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Gurmesa Geshere Abdisa, Wang Ang, Li Shanlong, Peng Shushi, de Vries Wim, Gundersen Per, Ciais Philippe, Phillips Oliver L, Hobbie Erik A, Zhu Weixing, Nadelhoffer Knute, Xi Yi, Bai Edith, Sun Tao, Chen Dexiang, Zhou Wenjun, Zhang Yiping, Guo Yingrong, Zhu Jiaojun, Duan Lei, Li Dejun, Koba Keisuke, Du Enzai, Zhou Guoyi, Han Xingguo, Han Shijie, Fang Yunting
Аннотация
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 ([Formula: see text]%) ([Formula: see text]) than ammonium ([Formula: see text]%) while soils retain more ammonium ([Formula: see text]%) than nitrate ([Formula: see text]%). We estimate that the N deposition-induced C sink in forests in the 2010s is [Formula: see text] Pg C yr-1, higher than previous estimates because of a larger role for oxidized N and greater rates of global N deposition.