However, it remains unknown whether microbiota-mediated carbon metabolism in different soil layers exhibits a similar change pattern with elevation.

The gap

Consensus across the literature

Supporting evidence — 4 representative gaps

• Metagenomic insights into the effects of tillage regime and branch-pruning mulch on soil carbon cycling and microbial function in apple orchards (2026) · doi

  The dynamic association network between functional soil carbon cycle genes and environmental variables offers critical insights into the regulatory mechanisms of carbon cycling under distinct orchard management practices. In the CT system, the carbon fixation genes significantly and positively correlated with MBC and AK. This result indicates that in the CT sys- tem, which is characterized by limited organic mat- ter input, microbial biomass and its metabolic activ- ity (as indicated by AK) are the primary indicators linked to carbon fixation capacity (Li et al. 2023; Qiu et  al. 2016). Repeated tillage disturbs surface veg- etation, cover, reduces plant-derived organic inputs and makes microbial turnover the primary driver of soil organic carbon accumulation. In contrast, the NG system showed a significantly restructured car- bon cycling network, underlining the transformative effect of sustained vegetation cover on soil carbon dynamics and functional gene expression. Addition- ally, methane metabolism genes strongly correlated with both DOC and POC, suggesting that grass cover provides an abundant substrate for methano- genic microbes. As a readily usable carbon source, DOC can potentially fuel methyl-coenzyme-mediated methanogenesis, while POC likely supports meth- ane metabolism through microhabitat formation and physical protection (Zhou et  al. 2023). Additionally, carbon fixation genes significantly and positively correlated with MBC, DOC, and POC, highlighting Although this study provided strong evidence for the positive effects of SDCM under NG conditions on soil carbon sequestration and cycling, some limi- tations should be acknowledged. First, the findings were derived from specific climatic conditions, soil type, and experimental duration; therefore, their gen- eralizability requires further validation through long- term field trials in diverse environments. Second, some conclusions regarding shifts in microbial carbon metabolism were inferential, as direct measurements of CH₄ and CO₂ fluxes were not conducted. While metagenomic data revealed that the SDCM under NG conditions suppressed methanogenesis-related genes, future studies incorporating direct CH₄ and CO₂ flux measurements are needed to validate these inferred shifts and quantitatively assess the net greenhouse gas balance.

  Keywords: carbon soil genes cycling fixation correlated organic microbial cover metabolism conditions network functional system positively
• Microbial autotrophy is widespread across soils and most prevalent in deep and saturated environments (2026) · doi

  Genes for CO2 fixation occur in soil microorganisms, but little is known about the pathways that are most common across ecosystem types, the organisms with these genes, where different CO2 fixation pathways are most prevalent, and the energy sources that support autotrophy across ecosystems.

  Keywords: genes fixation pathways across occur soil microorganisms little known common ecosystem types organisms different prevalent
• Microbe-mediated changes of soil dissolved organic matter in the rhizosphere of Pinus massoniana during vegetation restoration in a typical red soil erosion region of southern China (2026) · doi

  Background Vegetation restoration enhances soil carbon sequestration, yet the mechanisms linking soil organic matter accumulation to rhizosphere microbial dynamics remain unclear.

  Keywords: soil background vegetation restoration enhances carbon sequestration mechanisms linking organic matter accumulation rhizosphere microbial dynamics
• Elevation and vertical gradient changes of microbe-mediated carbon cycling function in Poyang Lake wetland (2026) · doi

  However, it remains unknown whether microbiota-mediated carbon metabolism in different soil layers exhibits a similar change pattern with elevation.

  Keywords: remains unknown whether microbiota mediated carbon metabolism different soil layers exhibits similar change pattern elevation