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| Molecular-weight-dependent redox cycling of humic substances of paddy soils over successive anoxic and oxic alternations | |
| Tan, Wenbing1; Wang, Guoan2; Zhao, Xinyu1; Dang, Qiuling3; Li, Renfei1; Xi, Beidou1; Jiang, Jie4; Zhang, Hui1; Li, Dan1; Cui, Dongyu1; Jia, Yufu2,5 | |
| 2019 | |
| 发表期刊 | LAND DEGRADATION & DEVELOPMENT
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| ISSN | 1085-3278 |
| 卷号 | 30期号:9页码:1130-1144 |
| 摘要 | Humic substances (HSs) are critical to regulating methane cycling in temporary anoxic systems because their redox-active functional groups can sustainably shuttle electrons from microorganisms to oxygen (O-2) over successive anoxic and oxic alternations. Whether the relative amount of these redox-active functional groups involved in redox cycles is associated with the overall chemical structures of HS still remains poorly understood. In this study, variations in the reducing capacities (RCs) of HSs extracted from paddy soils were monitored over consecutive cycles of reduction by iron-reducing microorganisms and oxidation by O-2. Our results show that about 10-40% of the microbially reduced redox-active moieties within HS, which were reoxidised by O-2, cannot restore the same redox state as those before microbial reduction. The restoration extents of RCs of HSs after microbial reduction and O-2 reoxidation were greatly negatively correlated with average molecular weight (AMW). The microbially reduced HSs having large AMWs (>1,000 Da) were more kinetically difficult to restore by O-2 from a reduced state to an oxidised state than were those having small AMWs (<1,000 Da) possibly because the former, which underwent process of microbial reduction and O-2 reoxidation, were more easily sheltered by other parts of HS structures than were the latter. Nevertheless, the unsheltered redox-active groups that accounted for about 50-85% in HSs can be fully reversible and sustainable to switch between a reduced state and an oxidised state over successive redox cycles. Our results can help to understand the redox dynamics of HSs in biogeochemical cycles in environments. |
| 关键词 | humic substances microbial reduction molecular weight redox cycling reoxidation by O-2 |
| 学科领域 | Environmental Sciences ; Soil Science |
| DOI | 10.1002/ldr.3299 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS关键词 | NATURAL ORGANIC-MATTER ; MICROBIAL REDUCTION ; ELECTRON-ACCEPTORS ; OPTICAL-PROPERTIES ; METHANE PRODUCTION ; FUNCTIONAL-GROUPS ; NITROUS-OXIDE ; FLUORESCENCE ; ACIDS ; RECALCITRANCE |
| WOS研究方向 | Environmental Sciences & Ecology ; Agriculture |
| WOS记录号 | WOS:000470932100010 |
| 出版者 | WILEY |
| 文献子类 | Article |
| 出版地 | HOBOKEN |
| EISSN | 1099-145X |
| 资助机构 | National Key Research and Development Program of China [2017YFA0605003] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51325804, 41501242] |
| 作者邮箱 | xibeidou@yeah.net |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ibcas.ac.cn/handle/2S10CLM1/19687 |
| 专题 | 植被与环境变化国家重点实验室 |
| 作者单位 | 1.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China 2.Chinese Res Inst Environm Sci, State Environm Protect Key Lab Simulat & Control, Beijing 100012, Peoples R China 3.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China 4.Beijing Normal Univ, Coll Water Sci, Beijing 100875, Peoples R China 5.Beijing Forestry Univ, Coll Environm Sci & Engn, Beijing 100083, Peoples R China 6.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tan, Wenbing,Wang, Guoan,Zhao, Xinyu,et al. Molecular-weight-dependent redox cycling of humic substances of paddy soils over successive anoxic and oxic alternations[J]. LAND DEGRADATION & DEVELOPMENT,2019,30(9):1130-1144. |
| APA | Tan, Wenbing.,Wang, Guoan.,Zhao, Xinyu.,Dang, Qiuling.,Li, Renfei.,...&Jia, Yufu.(2019).Molecular-weight-dependent redox cycling of humic substances of paddy soils over successive anoxic and oxic alternations.LAND DEGRADATION & DEVELOPMENT,30(9),1130-1144. |
| MLA | Tan, Wenbing,et al."Molecular-weight-dependent redox cycling of humic substances of paddy soils over successive anoxic and oxic alternations".LAND DEGRADATION & DEVELOPMENT 30.9(2019):1130-1144. |
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