Phosphorus alleviation of nitrogen‐suppressed methane sink in global grasslands
Phosphorus alleviation of nitrogen‐suppressed methane sink in global grasslands
复制标题
磷缓解氮抑制全球草原甲烷汇
DOI：
10.1111/ele.13480
复制
发表时间：
2020
期刊：
影响因子：
8.8
通讯作者：
Zhang, Zhenhua
中科院分区：
文献类型：
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作者：
Zhang, Lihua;Yuan, Fenghui;Bai, Junhong;Duan, Hongtao;Gu, Xueying;Hou, Longyu;Huang, Yao;Yang, Mingan;He, Jin‐Sheng;Zhang, Zhenhua
草地生态系统占全球土壤CH4汇的10%以上。4年的田间试验发现，单独添加P不影响CH4吸收，单独添加N显著抑制CH4吸收，而同时添加N和P抑制CH4吸收的程度较小。一项包括全球草原382个数据点的Meta分析证实了这些发现。全球外推的经验建模方法估计，当代N增加抑制CH4汇在全球草原11.4%，同时N和P的沉积使这种抑制5.8%。氮抑制的CH4汇的磷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。N和P对CH4吸收的影响表明，预计N和P沉降的增加可能会大大影响CH4吸收，并改变全球CH4循环。
Grassland ecosystems account for more than 10% of the global CH4sink in soils. A 4‐year field experiment found that addition of P alone did not affect CH4uptake and experimental addition of N alone significantly suppressed CH4uptake, whereas concurrent N and P additions suppressed CH4uptake 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 CH4sink in global grassland by 11.4% and concurrent N and P deposition alleviates this suppression to 5.8%. The P alleviation of N‐suppressed CH4sink is primarily attributed to substrate competition, defined as the competition between ammonium and CH4for the methane mono‐oxygenase enzyme. The N and P impacts on CH4uptake indicate that projected increases in N and P depositions might substantially affect CH4uptake and alter the global CH4cycle.