Investigating bacterial coupled assimilation of fertilizer‑nitrogen and crop residue‑carbon in upland soils by DNA-qSIP

Summary

This 2022 study employed quantitative DNA-stable isotope probing (DNA-qSIP) to investigate how soil bacterial communities in upland agroecosystems simultaneously assimilate nitrogen from mineral fertiliser and carbon from crop residues. The research characterised which bacterial taxa preferentially utilise these nutrient sources and quantified metabolic coupling between nitrogen and carbon cycling in response to routine agronomic inputs. The findings contribute to mechanistic understanding of how soil microbiota respond to fertiliser and organic matter inputs in upland farming systems.

UK applicability

Upland soils in the UK (moorlands, hill pastures, marginal arable areas) share similar properties to those studied; findings on bacterial-mediated nutrient cycling under combined fertiliser and residue inputs may inform sustainable intensification strategies. However, differences in soil type, climate and crop species between study region and UK require validation before direct application to UK upland management.

Key measures

Bacterial taxon-specific uptake of fertiliser nitrogen and crop residue carbon, measured via DNA-qSIP (quantitative stable isotope probing); degree of coupling between nitrogen and carbon assimilation pathways

Outcomes reported

The study characterised which soil bacterial taxa preferentially assimilate fertiliser-derived nitrogen and crop residue-derived carbon, and quantified the degree of metabolic coupling between these nutrient cycles. DNA-qSIP methodology was used to trace coupled nitrogen and carbon assimilation by bacterial communities in response to common agronomic inputs.

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