| Coupled dynamics of iron and iron-bound organic carbon in forest soils during anaerobic reduction | |
| Zhao, Qian ; Adhikari, Dinesh ; Huang, Rixiang ; Patel, Aman ; Wang, Xilong ; Tang, Yuanzhi ; Obrist, Daniel ; Roden, Eric E. ; Yang, Yu | |
| 2017 | |
| 关键词 | Iron-bound organic carbon Microbial reduction Soil organic carbon stability X-ray absorption spectroscopy Electron accepting capacity FRESH-WATER SEDIMENT HUMIC SUBSTANCES MICROBIAL REDUCTION ELECTRON-ACCEPTORS MINERAL SOIL SORPTIVE STABILIZATION SHEWANELLA-ONEIDENSIS BACTERIAL ADHESION FERRIC IRON MATTER |
| 英文摘要 | The behavior of iron (Fe)-bound organic carbon (DC) under anoxic conditions in natural soils and sediments represents a critical knowledge gap for understanding the biogeochemical cycles of OC and Fe. In this study, we investigated the dynamics of Fe and OC in four forest soils in the presence of the dissimilatory Fe-reducing bacterium, Shewanella oneidensis MR-1. Over an 8-day reduction period, 3.8-9.9% of total OC was released to solution in conjunction with the reduction of 12.5-37.7% of reactive Fe. The fraction of OC released was correlated with the fraction of Fe reduced, indicating that the reductive release was the controlling factor for the mobilization of OC upon the anaerobic microbial reaction. During the reduction, the fractions of poorly crystalline Fe oxides decreased, coupling with an increase in the relative abundance of crystalline Fe oxides. Lability of OC (as reflected by water-extractable OC content) increased after microbial reduction, indicating the decreased stability of OC because of changes in mineral-OC interactions and the conformation of mineral-OC complexes. The reduction of Fe was closely related to bulk soil electron accepting capacity (0.15-034 mmol e(-)/mol C). Our findings demonstrate that the redox reactions of Fe, modified by the redox reactivity of OC, play an important role in regulating the stability and transformation of OC. (C) 2016 Elsevier B.V. All rights reserved.; University of Nevada-Reno Startup fund; DOE [DE-SC0014275]; USDA [2015-67018-23120]; Georgia Institute of Technology; American Chemical Society Petroleum Research Fund [54143-DNI5]; National Science Foundation [CHE-1429768]; CPCI-S(ISTP); 118-126; 464 |
| 语种 | 英语 |
| 出处 | 20-Year Anniversary Symposium on Adsorption of Metals by Geomedia III held at the 251st National Spring Meeting of the American-Chemical-Society (ACS) |
| DOI标识 | 10.1016/j.chemgeo.2016.12.014 |
| 内容类型 | 其他 |
| 源URL | [http://ir.pku.edu.cn/handle/20.500.11897/469653]  |
| 专题 | 城市与环境学院 |
| 推荐引用方式 GB/T 7714 | Zhao, Qian,Adhikari, Dinesh,Huang, Rixiang,et al. Coupled dynamics of iron and iron-bound organic carbon in forest soils during anaerobic reduction. 2017-01-01. |
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