Inorganic nitrogen and glucose additions alter the short-term formation efficiency of mineral associated organic matter carbon

Kirsty Paterson, Joanna M. Cloy, Robert M. Rees, Sarah Buckingham, Liz Baggs

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Carbon within mineral associated organic matter (MAOM) is an important persistent form of soil organic carbon (SOC). However, processes driving the retention of new labile C in MAOM are not fully understood. We investigated the effects of glucose and ammonium nitrate (AN) addition on the short-term (72 h) retention of applied 13C-glucose within MAOM. We found an interactive effect of AN addition with the glucose addition rate. Higher rates of glucose addition resulted in proportionally less glucose-C retained, indicating lower MAOM-C formation efficiency. Addition of AN only altered the proportional retention of glucose where glucose was applied at the lowest rate. In this instance glucose-13C recovery increased with AN addition. However, after 72 h there was no treatment difference in total MAOM-C, indicating that any changes in formation efficiency as a result of AN and glucose additions, did not result in differences in total MAOM-C in the short-term. Whether and how this affects the medium and longer-term dynamics of MAOM-C requires further investigation.
Original languageEnglish
Pages (from-to)1-4
JournalGeoderma
Volume442
DOIs
Publication statusPublished - 6 Feb 2024

Keywords / Materials (for Non-textual outputs)

  • Ammonium nitrate fertiliser
  • low molecular weight carbon
  • mineral associated organic matter
  • soil organic carbon

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