Elevated methane flux in a tropical peatland post-fire is linked to depth-dependent changes in peat microbiome assembly

Author:

Bandla AdityaORCID,Akhtar HasanORCID,Lupascu MassimoORCID,Sukri Rahayu SukmariaORCID,Swarup SanjayORCID

Abstract

AbstractFires in tropical peatlands extend to depth, transforming them from carbon sinks into methane sources and severely limit forest recovery. Peat microbiomes influence carbon transformations and forest recovery, yet our understanding of microbiome shifts post-fire is currently limited. Our previous study highlighted altered relationships between the peat surface, water table, aboveground vegetation, and methane flux after fire in a tropical peatland. Here, we link these changes to post-fire shifts in peat microbiome composition and assembly processes across depth. We report kingdom-specific and depth-dependent shifts in alpha diversity post-fire, with large differences at deeper depths. Conversely, we found shifts in microbiome composition across all depths. Compositional shifts extended to functional groups involved in methane turnover, with methanogens enriched and methanotrophs depleted at mid and deeper depths. Finally, we show that community shifts at deeper depths result from homogeneous selection associated with post-fire changes in hydrology and aboveground vegetation. Collectively, our findings provide a biological basis for previously reported methane fluxes after fire and offer new insights into depth-dependent shifts in microbiome assembly processes, which ultimately underlie ecosystem function predictability and ecosystem recovery.

Funder

Integrated Tropical Peatlands Research Programme (INTPREP) Singapore Center for Environmental Life Sciences Engineering

Ministry of Education - Singapore

Publisher

Springer Science and Business Media LLC

Subject

Applied Microbiology and Biotechnology,Microbiology,Biotechnology

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