Campus Units
Ecology, Evolution and Organismal Biology
Document Type
Article
Publication Version
Published Version
Publication Date
7-2016
Journal or Book Title
Soil Biology and Biochemistry
Volume
98
First Page
95
Last Page
98
DOI
10.1016/j.soilbio.2016.04.010
Abstract
The importance of lignin as a recalcitrant constituent of soil organic matter (SOM) remains contested. Associations with iron (Fe) oxides have been proposed to specifically protect lignin from decomposition, but impacts of Fe-lignin interactions on mineralization rates remain unclear. Oxygen (O2) fluctuations characteristic of humid tropical soils drive reductive Fe dissolution and precipitation, facilitating multiple types of Fe-lignin interactions that could variably decompose or protect lignin. We tested impacts of Fe addition on 13C methoxyl-labeled lignin mineralization in soils that were exposed to static or fluctuating O2. Iron addition suppressed lignin mineralization to 21% of controls, regardless of O2 availability. However, Fe addition had no effect on soil CO2 production, implying that Fe oxides specifically protected lignin methoxyls but not bulk SOM. Iron oxide-lignin interactions represent a specific mechanism for lignin stabilization, linking SOM biochemical composition to turnover via geochemistry.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Hall, Steven J.; Silver, Whendee L.; Timokhin, Vitaliy I.; and Hammel, Kenneth E., "Iron Addition to Soil Specifically Stabilized Lignin" (2016). Ecology, Evolution and Organismal Biology Publications. 194.
https://lib.dr.iastate.edu/eeob_ag_pubs/194
Included in
Biogeochemistry Commons, Ecology and Evolutionary Biology Commons, Environmental Chemistry Commons, Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Geochemistry Commons
Comments
This article is from Soil Biology and Biochemistry 98 (2016): 95, doi: 10.1016/j.soilbio.2016.04.010. Posted with permission.