Iron addition to soil specifically stabilized lignin

被引：66

作者：

Hall, Steven J. ^{[1
]}

Silver, Whendee L. ^{[2
]}

Timokhin, Vitally. I. ^{[3
]}

Hammel, Kenneth E. ^{[4
,5
]}

机构：

[1] Iowa State Univ, Dept Ecol Evolut & Organismal Biol, Ames, IA 50011 USA

[2] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA

[3] Univ Wisconsin, Wisconsin Energy Inst, Dept Biochem, Madison, WI 53706 USA

[4] US Forest Serv, Madison, WI 53726 USA

[5] Univ Wisconsin, Dept Bacteriol, Madison, WI 53706 USA

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2016年 / 98卷

基金：

美国国家科学基金会;

关键词：

Carbon stabilization; Iron; Lignin; Recalcitrance; Redox; Soil organic matter; ORGANIC-MATTER FRACTIONS; DECOMPOSITION; TURNOVER; CARBON; DEGRADATION; GOETHITE; DYNAMICS; FIELD; NMR;

D O I：

10.1016/j.soilbio.2016.04.010

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

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 (O-2) 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 C-13 methoxyl-labeled lignin mineralization in soils that were exposed to static or fluctuating O-2. Iron addition suppressed lignin mineralization to 21% of controls, regardless of O-2 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. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：95 / 98

页数：4

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