Climate-driven shifts in sediment chemistry enhance methane production in northern lakes
Climate-driven shifts in sediment chemistry enhance methane production in northern lakes
复制标题
气候驱动的沉积物化学变化提高了北部湖泊的甲烷产量
DOI:
10.1101/161653
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Emilson E
中科院分区:
文献类型:
--
作者:
Emilson E
Freshwater ecosystems are a major source of methane (CH4), contributing 0.65 Pg (in CO2equivalents) yr−1towards global carbon emissions and offsetting ~25% of the terrestrial carbon sink. Most freshwater CH4emissions come from littoral sediments, where large quantities of plant material are decomposed. Climate change is predicted to shift plant community composition, and thus change the quality of inputs into detrital food webs, with the potential to affect CH4production. Here we find that variation in phenol availability from decomposing organic matter underlies large differences in CH4production in lake sediments. Production is at least 400-times higher from sediments composed of macrophyte litter compared to terrestrial sources because of inhibition of methanogenesis by phenol leachates. Our results now suggest that earth system models and carbon budgets should consider the effects of plant communities on sediment chemistry and ultimately CH4emissions at a global scale.
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