Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.orggeochem.2004.05.001
Title (Primary) Assimilation of CO2 by soil microorganisms and transformation into soil organic matter
Author Miltner, A. ORCID logo ; Richnow, H.H.; Kopinke, F.-D.; Kästner, M.
Source Titel Organic Geochemistry
Year 2004
Volume 35
Issue 9
Page From 1015
Page To 1024
Language englisch
Keywords Carbon dioxide assimilation; microbial communities; fatty acids; fixation; respiration; carboxylase; metabolism; oxidation; turnover; residues

Soil microorganisms have been shown to fix CO2. Although this process plays only a minor quantitative role on a bulk soil basis, it is important in certain microenvironments of the soil and may change the assessment of data on soil organic matter turnover as determined by stable isotope techniques and on the formation of bound residues from radioactively labelled pollutants. To study this process, we incubated soil in the dark under a 13CO2-enriched atmosphere and found a significant transfer of the label into soil organic matter (1.3 μmol C g−1 soil after 61 days). Enrichment of the label in fatty acids (δ13C up to 1200‰) and amino acids (δ13C up to 200‰) showed that microbial biomass mediates the process. The data indicate that a wide range of autotrophic and heterotrophic microorganisms are involved and that anaplerotic reactions make a significant contribution. Part of the label appeared to have been already transformed to non-living soil organic matter, after lysis of the microbial cells.

Persistent UFZ Identifier
Miltner, A., Richnow, H.H., Kopinke, F.-D., Kästner, M. (2004):
Assimilation of CO2 by soil microorganisms and transformation into soil organic matter
Org. Geochem. 35 (9), 1015 - 1024 10.1016/j.orggeochem.2004.05.001