Letter: Trophic interactions regulate peatland carbon cycling,Ecology Letters

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Letter: Trophic interactions regulate peatland carbon cycling
Ecology Letters ( IF 7.6 ) Pub Date : 2021-02-07 , DOI: 10.1111/ele.13697
Kevin H. Wyatt ₁ , Kevin S. McCann ₂ , Allison R. Rober ₁ , Merritt R. Turetsky ₃

Affiliation

Peatlands are the most efficient natural ecosystems for long‐term storage of atmospheric carbon. Our understanding of peatland carbon cycling is based entirely on bottom‐up controls regulated by low nutrient availability. Recent studies have shown that top‐down controls through predator‐prey dynamics can influence ecosystem function, yet this has not been evaluated in peatlands to date. Here, we used a combination of nutrient enrichment and trophic‐level manipulation to test the hypothesis that interactions between nutrient availability (bottom‐up) and predation (top‐down) influence peatland carbon fluxes. Elevated nutrients stimulated bacterial biomass and organic matter decomposition. In the absence of top‐down regulation, carbon dioxide (CO₂) respiration driven by greater decomposition was offset by elevated algal productivity. Herbivores accelerated CO₂ emissions by removing algal biomass, while predators indirectly reduced CO₂ emissions by muting herbivory in a trophic cascade. This study demonstrates that trophic interactions can mitigate CO₂ emissions associated with elevated nutrient levels in northern peatlands.

中文翻译：

信：营养相互作用调节泥炭地碳循环

泥炭地是长期存储大气碳的最有效的自然生态系统。我们对泥炭地碳循环的理解完全基于低养分利用率调节的自下而上的控制措施。最近的研究表明，通过捕食者-猎物的动力学进行自上而下的控制会影响生态系统的功能，但迄今为止尚未在泥炭地中进行评估。在这里，我们结合了养分富集和营养水平操作，以检验养分可利用度（自下而上）与捕食（自上而下）之间的相互作用影响泥炭地碳通量的假设。营养物质的增加刺激了细菌的生物量和有机物的分解。在没有自上而下的法规的情况下，二氧化碳（CO ₂更大分解作用驱动的呼吸被藻类生产力的提高所抵消。草食动物通过去除藻类生物质而加速了CO ₂排放，而掠食者通过在营养级联中屏蔽草食而间接减少了CO ₂排放。这项研究表明，营养相互作用可以减轻北部泥炭地中与养分水平升高相关的CO ₂排放。

更新日期：2021-03-16

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