Phosphorus alleviation of nitrogen-suppressed methane sink in global grasslands.,Ecology Letters

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Phosphorus alleviation of nitrogen-suppressed methane sink in global grasslands.
Ecology Letters ( IF 7.6 ) Pub Date : 2020-02-25 , DOI: 10.1111/ele.13480
Lihua Zhang _{1,

2,

3,

4} , Fenghui Yuan _{3,

5} , Junhong Bai ₆ , Hongtao Duan ₇ , Xueying Gu ₄ , Longyu Hou ₄ , Yao Huang ₄ , Mingan Yang ₈ , Jin-Sheng He ₉ , Zhenhua Zhang ₉ , Lijun Yu ₁₀ , Changchun Song ₂ , David A Lipson ₃ , Donatella Zona ₃ , Walter Oechel ₃ , Ivan A Janssens ₁₁ , Xiaofeng Xu _{2,

3}

Affiliation

College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China.
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China.
Biology Department, San Diego State University, San Diego, CA, 92182, USA.
State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China.
Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China.
School of Environment, Beijing Normal University, Beijing, 100875, China.
Key Laboratory of Watershed Geographic Sciences, Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
Division of Epidemiology and Biostatistics, San Diego State University, San Diego, CA, 92182, USA.
Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810008, China.
LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China.
Department of Biology, University of Antwerp, Wilrijk, Belgium.

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.

中文翻译：

全球草地中氮抑制的甲烷汇的磷缓解作用。

草地生态系统占土壤中全球CH4汇总量的10％以上。一项为期4年的田间试验发现，单独添加P不会影响CH4的吸收，而单独添加N的实验会显着抑制CH4的吸收，而同时添加N和P会抑制CH4的吸收。一项包含全球草原上382个数据点的荟萃分析证实了这些发现。用经验建模方法进行的全球外推法估计，当代氮的添加将全球草地中的CH4沉降抑制了11.4％，同时氮和磷的沉积将这种抑制作用降低至5.8％。N抑制的CH4汇的P减轻主要归因于底物竞争，底物竞争是指铵与CH4之间对甲烷单加氧酶的竞争。

更新日期：2020-02-25

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