Environmental Studies and Forestry

Linking meta-omics to the kinetics of denitrification intermediates reveals pH-dependent causes of N₂O emissions and nitrite accumulation in soil

Å. Frostegård, S. H. W. Vick, et al.

This study by Åsa Frostegård and colleagues delves into how soil pH affects denitrification, revealing surprising findings about N₂O emissions and nitrite levels. The research showcases the complex interactions between soil chemistry and microbial activity, highlighting significant implications for predicting ecological outcomes.

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Abstract

This study investigated the impact of soil pH on denitrification processes, focusing on N₂O emissions and nitrite accumulation. Using metagenomics, transcriptomics, and phenomics, two soils with differing pH (3.8 and 6.8) were analyzed. The acidic soil exhibited delayed N₂O reduction despite *nosZ* transcription, indicating post-transcriptional inhibition of NosZ at low pH. Nitrite accumulation in neutral soil was attributed to high *nar* expression, while low nitrite concentrations in acidic soil were found to be primarily due to biological activity, not abiotic degradation. The study highlights the limitations of using gene and transcript quantification to predict community phenotypes.

Publisher

The ISME Journal

Published On

Jul 01, 2021

Authors

Åsa Frostegård, Silas H. W. Vick, Natalie Y. N. Lim, Lars R. Bakken, James P. Shapleigh

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