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Title: Iron addition to soil specifically stabilized lignin

Source: Soil Biology and Biochemistry

Author(s)Hall, Steven J.; Silver, Whendee L.; Timokhin, Vitaliy I.; Hammel, Kenneth E.

Publication Year: 2016  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4712-2B

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.

Keywords: Carbon stabilization; Iron; Lignin; Recalcitrance; Redox; Soil organic matter

Publication Review Process: Formally Refereed

File size: 825 kb(s)

Date posted: 05/24/2016

This publication is also viewable on Treesearch:  view
RITS Product ID: 79252
Current FPL Scientist associated with this product
Hammel, Kenneth E.
Research Chemist
  

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