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

文献类型： 外文期刊

第一作者： Gurmesa, Geshere Abdisa

作者： Gurmesa, Geshere Abdisa;Wang, Ang;Li, Shanlong;Sun, Tao;Zhu, Jiaojun;Fang, Yunting;Wang, Ang;Zhu, Jiaojun;Fang, Yunting;Wang, Ang;Fang, Yunting;Li, Shanlong;Peng, Shushi;Xi, Yi;de Vries, Wim;Gundersen, Per;Ciais, Philippe;Ciais, Philippe;Phillips, Oliver L.;Hobbie, Erik A.;Zhu, Weixing;Nadelhoffer, Knute;Bai, Edith;Chen, Dexiang;Zhou, Wenjun;Zhang, Yiping;Guo, Yingrong;Duan, Lei;Li, Dejun;Koba, Keisuke;Du, Enzai;Du, Enzai;Zhou, Guoyi;Han, Xingguo;Han, Shijie

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：17.694； 五年影响因子：17.763 ）

ISSN：

年卷期： 2022 年 13 卷 1 期

页码：

收录情况： SCI

摘要： 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 N-15-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)%) (mean(minimum)(maximum)) than ammonium (12(8)(16)%) while soils retain more ammonium (57(49)(65)%) than nitrate (46(32)(59)%). We estimate that the N deposition-induced C sink in forests in the 2010s is 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.

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