Carbon availability and redox potential regulate carbon mineralization in peat soils under contrasting moisture regimes
文献类型：期刊论文
| 作者 | Xu, Guangyuan4; Cai, Jiye4; Wang, Yuting4; Wang, Yang4; Pan, Junxiao3; Wang, Zucheng1,2,4; Li, Hongkai4; Dong, Yanmin1,2,4; Liu, Shasha1,2,4; Liu, Ziping1,2,4 |
| 刊名 | APPLIED SOIL ECOLOGY
 |
| 出版日期 | 2026-05-01 |
| 卷号 | 221页码:106932 |
| 关键词 | Iron addition CO 2 emission rates Fe(II)/WEOC ratio Hydrolase activities Oxidase activities |
| ISSN号 | 0929-1393 |
| DOI | 10.1016/j.apsoil.2026.106932 |
| 产权排序 | 2 |
| 文献子类 | Article |
| 英文摘要 | Soil organic carbon (SOC) reservoirs in peatlands are highly vulnerable to anthropogenic disturbance and climate change. Although soil moisture regulates carbon cycling in peatlands through both the enzyme latch and the iron gate pathways, the extent to which these mechanisms are modulated by iron concentrations remains poorly constrained. To address this limitation, a 90-day laboratory incubation was conducted using drained, degraded peat soil to systematically examine how iron concentration gradients affect organic matter mineralization under contrasting moisture regimes (65% vs. 120% water-holding capacity (WHC)). The results revealed a nonlinear relationship between soil enzyme activities and the Fe(II) to water-extractable organic carbon (Fe(II)/ WEOC) ratio. Critically, the thresholds of the Fe(II)/WEOC ratio at 120% WHC (2.7-3.0) were substantially higher than those at 65% WHC (0.9-1.1). As the Fe(II)/WEOC ratio exceeded its threshold, soil beta-1,4-glucosidase activity declined steadily, whereas polyphenol oxidase activity initially decreased and then slightly increased. SOC mineralization was primarily and positively regulated by WEOC at 65% WHC and by oxidation-reduction potential at 120% WHC. At 65% WHC, the soil Fe(II)/SOC ratio promoted SOC mineralization by stimulating oxidase activity. However, at 120% WHC, it directly enhanced SOC mineralization. SOC mineralization rates were positively correlated with Fe(II) concentrations and the Fe(II)/SOC ratio, regardless of moisture conditions. These results clarify how moisture-dependent Fe-enzyme-C interactions control the incomplete deactivation of the enzyme latch under flooding conditions and provide a mechanistic basis for designing drainage-rewetting strategies that minimize peatland carbon loss under future climate scenarios. |
| URL标识 | 查看原文 |
| WOS关键词 | EXTRACELLULAR ENZYME-ACTIVITY ; ORGANIC-MATTER DECOMPOSITION ; OXIDASE ACTIVITY ; IRON REDUCTION ; PEATLANDS ; ASSOCIATIONS ; FE ; PRESERVATION ; DROUGHT ; LATCH |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:001711304200001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/221180]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Xu, Zhiwei; Wang, Shengzhong |
| 作者单位 | 1.Northeast Normal Univ, State Environm Protect Key Lab Wetland Ecol & Vege, Changchun 130024, Peoples R China; 2.Northeast Normal Univ, Inst Peat & Mire Res, Jilin Prov Key Lab Wetland Ecol Proc & Environm Ch, Changchun 130024, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; 4.Northeast Normal Univ, Sch Geog Sci, Key Lab Geog Proc & Ecol Secur Changbai Mt, Minist Educ, Changchun 130024, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Xu, Guangyuan,Cai, Jiye,Wang, Yuting,et al. Carbon availability and redox potential regulate carbon mineralization in peat soils under contrasting moisture regimes[J]. APPLIED SOIL ECOLOGY,2026,221:106932. |
| APA | Xu, Guangyuan.,Cai, Jiye.,Wang, Yuting.,Wang, Yang.,Pan, Junxiao.,...&Wang, Shengzhong.(2026).Carbon availability and redox potential regulate carbon mineralization in peat soils under contrasting moisture regimes.APPLIED SOIL ECOLOGY,221,106932. |
| MLA | Xu, Guangyuan,et al."Carbon availability and redox potential regulate carbon mineralization in peat soils under contrasting moisture regimes".APPLIED SOIL ECOLOGY 221(2026):106932. |
入库方式： OAI收割
来源：地理科学与资源研究所
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