Scaling from carbon use efficiency genomic traits to carbon farming practices
Research-based solution linking microbial carbon use efficiency in soil aggregate fractions to improved carbon farming practices. Identifies microbial taxa and genomic traits responsible for soil carbon accumulation under organic versus conventional management, enabling evidence-based recommendations for carbon sequestration in agricultural systems.
Overview
This research program investigates how microbial carbon use efficiency (CUE) varies across soil aggregate fractions to inform carbon farming practices that enhance soil carbon sequestration. The work addresses a critical gap in soil carbon science: existing CUE measurements assume uniform microbial metabolic traits, overlooking the physiological diversity of microbial communities across different soil microenvironments.
The solution connects genomic-level microbial traits to field-scale agricultural outcomes. By identifying which microbial taxa and genetic capabilities drive carbon accumulation in specific soil aggregate fractions, the program delivers actionable insights for designing management practices that promote soil carbon storage. The research leverages a six-year field trial comparing organic manure and conventional fertilizer treatments in a California production system.
Technical specifications
Core research approach:
- Metagenomic analysis of four soil aggregate size fractions (silt+clay, microaggregate 53–250µm, small macroaggregate 250–2000µm, and large macroaggregate >2000µm)
- Stable isotope probing (SIP) using C13-labeled carbohydrates (glucose and xylan) to trace carbon assimilation by specific microbial taxa
- Ultracentrifugation-based DNA separation to isolate labeled and unlabeled microbial fractions
- Metagenome-assembled genome (MAG) reconstruction to link taxonomic identity with ecological traits
- Randomized block field trial design with four replicates per treatment over six years of continuous management
Key findings to date:
- Organic manure treatment significantly increased soil organic matter, microbial biomass, and macroaggregate formation compared to conventional fertilizer
- Microbial community composition differs significantly across aggregate size fractions
- Metagenomic analysis reveals significant differences in carbon utilization gene abundance across aggregate fractions
Predicted outcomes:
- Microbial taxa in microaggregates exhibit higher carbon use efficiency than those in macroaggregates
- Microaggregates harbor enriched gene sets for metabolism of complex carbon compounds
Technology readiness level
The program is at an advanced research validation stage. A six-year field trial has already produced statistically significant results demonstrating differential microbial abundance across aggregate fractions and treatment effects on soil carbon accumulation. The current validation phase employs stable isotope probing experiments to directly identify which microbial taxa assimilate and store carbon from substrates of varying complexity. Metagenome-assembled genomes will be constructed to establish ecological trait-to-function relationships. Future work will translate these genomic findings into scalable carbon farming practice recommendations for agricultural systems.
About University of California, Davis
UC Davis is a comprehensive public research university in Northern California, combining a land-grant heritage with an integrated academic health system and a veterinary teaching hospital. Industry engages through co-located clinical and translational facilities in Sacramento, a campus-adjacent research park, pilot-scale food and bioprocessing facilities, and a statewide extension network for field-to-market deployment. Proximity to the Bay Area and California's Central Valley enables rapid collaboration with startups and established enterprises, while corporate relations staff streamline access to faculty, talent, and core labs. Research is supported by competitive federal funding from agencies such as NIH, NSF, USDA, and DOE. A dedicated technology transfer office and venture support programs provide IP management, licensing, and startup formation pathways for industry partnerships.
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