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Disproportionate increase in freshwater methane emissions induced by experimental warming
Nature Climate Change ( IF 30.7 ) Pub Date : 2020-06-29 , DOI: 10.1038/s41558-020-0824-y
Yizhu Zhu , Kevin J. Purdy , Özge Eyice , Lidong Shen , Sarah F. Harpenslager , Gabriel Yvon-Durocher , Alex J. Dumbrell , Mark Trimmer

Net emissions of the potent GHG methane from ecosystems represent the balance between microbial methane production (methanogenesis) and oxidation (methanotrophy), each with different sensitivities to temperature. How this balance will be altered by long-term global warming, especially in freshwaters that are major methane sources, remains unknown. Here we show that the experimental warming of artificial ponds over 11 years drives a disproportionate increase in methanogenesis over methanotrophy that increases the warming potential of the gases they emit. The increased methane emissions far exceed temperature-based predictions, driven by shifts in the methanogen community under warming, while the methanotroph community was conserved. Our experimentally induced increase in methane emissions from artificial ponds is, in part, reflected globally as a disproportionate increase in the capacity of naturally warmer ecosystems to emit more methane. Our findings indicate that as Earth warms, natural ecosystems will emit disproportionately more methane in a positive feedback warming loop.



中文翻译:

实验性变暖引起的淡水甲烷排放不成比例的增加

来自生态系统的有效GHG甲烷的净排放量代表了微生物甲烷产生(甲烷生成)和氧化(甲烷富营养化)之间的平衡,两者对温度的敏感性不同。长期的全球变暖如何改变这种平衡,尤其是在主要甲烷来源的淡水中,仍然未知。在这里,我们显示,人造池塘经过11年的实验性变暖导致甲烷生成过程的甲烷生成量比甲烷氧化层肥成比例的增加,从而增加了它们所排放气体的变暖潜能。甲烷排放量的增加远远超过了基于温度的预测,这是由于变暖下甲烷菌群落的变化所致,而甲烷营养生物群落得到了保护。根据实验,人工池塘甲烷排放量的增加部分是因为 在全球范围内反映出,自然变暖的生态系统释放更多甲烷的能力不成比例地增加。我们的发现表明,随着地球变暖,自然生态系统将在正反馈变暖回路中排放不成比例的更多甲烷。

更新日期:2020-06-29
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