Phosphorus alleviation of nitrogen-suppressed methane sink in global grasslands.
Phosphorus alleviation of nitrogen-suppressed methane sink in global grasslands.
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DOI：
10.22541/au.157824548.83033801
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发表时间：
2020-01
期刊：
影响因子：
8.8
通讯作者：
Lihua Zhang;F. Yuan;J. Bai;H. Duan;Xueying Gu;Longyu Hou;Yao Huang;Mingan Yang;Jinsheng He;Zhenhua Zhang;Lijun Yu;C. Song;D. Lipson;D. Zona;W. Oechel;I. Janssens;Xiaofeng Xu
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文献类型：
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作者：
Lihua Zhang;F. Yuan;J. Bai;H. Duan;Xueying Gu;Longyu Hou;Yao Huang;Mingan Yang;Jinsheng He;Zhenhua Zhang;Lijun Yu;C. Song;D. Lipson;D. Zona;W. Oechel;I. Janssens;Xiaofeng Xu
草原生态系统占全球土壤 CH4 汇的 10% 以上。一项为期 4 年的田间实验发现，单独添加 P 不会影响 CH4 吸收，单独添加 N 显着抑制 CH4 吸收，而同时添加 N 和 P 对 CH4 吸收的抑制程度较小。一项包含全球草原 382 个数据点的荟萃分析证实了这些发现。采用经验模型方法进行的全球外推估计，当代氮添加抑制了全球草地 CH4 汇 11.4%，同时氮和磷沉降将这种抑制减轻至 5.8%。 N 抑制的 CH4 汇的 P 缓解主要归因于底物竞争，定义为铵和 CH4 之间对甲烷单加氧酶的竞争。氮和磷对 CH4 吸收的影响表明，预计氮和磷沉积量的增加可能会严重影响 CH4 吸收并改变全球 CH4 循环。
Grassland ecosystems account for more than 10% of the global CH4 sink in soils. A 4-year field experiment found that addition of P alone did not affect CH4 uptake and experimental addition of N alone significantly suppressed CH4 uptake, whereas concurrent N and P additions suppressed CH4 uptake to a lesser degree. A meta-analysis including 382 data points in global grasslands corroborated these findings. Global extrapolation with an empirical modelling approach estimated that contemporary N addition suppresses CH4 sink in global grassland by 11.4% and concurrent N and P deposition alleviates this suppression to 5.8%. The P alleviation of N-suppressed CH4 sink is primarily attributed to substrate competition, defined as the competition between ammonium and CH4 for the methane mono-oxygenase enzyme. The N and P impacts on CH4 uptake indicate that projected increases in N and P depositions might substantially affect CH4 uptake and alter the global CH4 cycle.