土壌微生物群集の組成変化が水素および一酸化炭素酸化活性に与える影響
The oxidative capacity of the troposphere is regulated in part by microbial uptake of trace gases, yet the relationship between soil microbial diversity and this function remains poorly characterized. Using soil microcosms in which microbial diversity was manipulated through dilution and antibiotic treatments, this study assessed community-level physiological profiles (CLPPs), CO2 production, and the oxidation activities of molecular hydrogen (H2) and carbon monoxide (CO). PCR amplicon sequencing of the bacterial 16S rRNA gene revealed significant shifts in species composition without corresponding changes in species richness. Dilution treatments reduced H2 oxidation by 58–98% and CO oxidation by 54–99% relative to reference microcosms, whereas antibiotic treatments did not produce comparable effects. CLPPs were approximately 15% higher across dilution and antibiotic treatments than in reference conditions. These findings demonstrate that H2 and CO oxidation activities in soil are sensitive to compositional, rather than richness-based, changes in the microbial community.
Dilution-induced shifts in soil microbial species composition, independent of species richness, substantially reduced H2 and CO oxidation activities, indicating that specific community members are responsible for these trace gas oxidation functions.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/31999470