Are the biogeochemical cycles of carbon, nitrogen, sulfur, and phosphorus driven by the "FeIII-FeII redox wheel" in dynamic redox environments?

Li, Yichun, Yu, Shen, Strong, James and Wang, Hailong (2012) Are the biogeochemical cycles of carbon, nitrogen, sulfur, and phosphorus driven by the "FeIII-FeII redox wheel" in dynamic redox environments?. Journal of Soils and Sediments, 12 5: 683-693. doi:10.1007/s11368-012-0507-z


Author Li, Yichun
Yu, Shen
Strong, James
Wang, Hailong
Title Are the biogeochemical cycles of carbon, nitrogen, sulfur, and phosphorus driven by the "FeIII-FeII redox wheel" in dynamic redox environments?
Journal name Journal of Soils and Sediments   Check publisher's open access policy
ISSN 1439-0108
1614-7480
Publication date 2012-01-01
Sub-type Article (original research)
DOI 10.1007/s11368-012-0507-z
Volume 12
Issue 5
Start page 683
End page 693
Total pages 11
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
Purpose: Iron's fluctuation between the II (ferrous) and III (ferric) oxidation states has been coined as the "FeIII-FeII redox wheel." Numerous studies have coupled the "iron redox wheel" with the biogeochemical cycle of carbon (C), nitrogen (N), sulfur (S), or phosphorus (P) individually in soils or sediments, but evidence suggests that the FeIII-FeII redox wheel drives the biogeochemical cycles interactively in a fluctuating redox microenvironment. The interactions of the FeIII-FeII redox wheel with the biogeochemical cycles of C, N, S, and P in the fluctuating redox environments were reviewed in this paper.

Discussion: In this review, we discuss the importance of iron with regard to each of the biogeochemical cycles individually as well as interactively. The importance of crystalline and non-crystalline FeIII (hydr)oxides is highlighted as they serve as terminal electron acceptors for organic matter mineralization and N and S transformation and also act as sorbents for dissolved P compounds. Mechanically, electron transfer from organic matter to FeIII (hydr)oxides via organic matter oxidation, oxidation of NH4 + to NO2 -, formation and oxidation of Fe sulfide minerals in the S cycle, and P transformation were discussed to couple with the FeIII-FeII redox wheel.

Conclusions: The knowledge gaps are identified at the end of the review. The natural environmental relationships still require further studies that link the iron redox wheel as a driver of the biogeochemical cycles of C, N, S, and P. Anthropogenically altered environments (nutrient and metal elevation, global warming, and acidification) require intensive studies to allow for improved integrated modeling of global C, N, S, and P biogeochemical cycles driven by the FeIII-FeII redox wheel. 
Keyword Biogeochemical cycles
FeIII-FeII redox wheel
Ferric
Ferrous
Oxidation
Reduction
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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