Plant organ rather than cover crop species determines residue incorporation into SOC pools

Summary

This study investigates whether it is the type of plant organ — rather than the cover crop species itself — that drives how residues are incorporated into soil organic carbon pools. By separating the contributions of roots, shoots, and other organ types across multiple cover crop species, the research likely demonstrates that organ-specific traits such as biochemical composition and structural recalcitrance are more deterministic of SOC pool dynamics than species identity alone. The findings have implications for cover crop management strategies aimed at building stable soil carbon.

UK applicability

The findings are broadly applicable to UK arable systems, where cover cropping is an increasingly common practice supported under agri-environment schemes such as Sustainable Farming Incentive. Understanding that plant organ type drives SOC incorporation could inform cover crop management decisions, particularly in terms of how above- and below-ground biomass is handled at termination.

Key measures

Soil organic carbon pool fractions; residue incorporation rates; plant organ biochemical composition (e.g. C:N ratio, lignin content); SOC stabilisation efficiency

Outcomes reported

The study examined how different plant organs (e.g. roots, stems, leaves) from cover crop species influence the incorporation of organic residues into distinct soil organic carbon (SOC) pools. It likely reports on the relative contributions of organ-specific residue chemistry to SOC stabilisation and turnover.

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