Concentration and spectroscopic characteristics of DOM in surface runoff and fracture flow in a cropland plot of a loamy soil
文献类型：期刊论文
| 作者 | Xian, Qingsong1,2 ; Li, Penghui3; Liu, Chen1; Cui, Junfang1; Guan, Zhuo1; Tang, Xiangyu1
|
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2018-05-01 |
| 卷号 | 622页码:385-393 |
| 关键词 | Soil Dissolved organic matter Hydrological process EEM fluorescence PARAFAC analysis |
| ISSN号 | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2017.12.010 |
| 英文摘要 | Being crucial for predicting the impact of source inputs on a watershed in rainfall events, an understanding of the dynamics and characteristics of dissolved organic matter (DOM) export from the soil under particular land use types, particularly those associated with underground flows is still largely lacking. A field study was carried out using a 1500 m(2) slope farmland plot in the hilly area of Sichuan Basin, Southwest China. The discharge of surface runoff and fracture flow was recorded and samples were collected in four representative rainfall events. For DOM characterization, concentration of dissolved organic carbon (DOC) and absorbance/excitation-emission matrix (EEM) fluorescence were analyzed. Soil water potential was also determined using tensiometers for understanding the runoff generation mechanisms. The DOC values for both surface and fracture flow showed significant responses to rainfall, with hydrological path being the primary factor in determining DOM dynamics. EEM-PARAFAC analyses indicated that the soil DOM mainly consisted of two terrestrial humic-like components with peaks located at Ex/Em 270(380)/480 nm (C1) and 250(320)/410 nm (C2), respectively. Concentrations of these components also responded strongly to rainfall, fluctuating in good agreement with the corresponding DOCs. Although there was no change in the presence of the components themselves, their relative distributions varied during precipitation, with the C1/C2 ratio increasing with the proportion of soil pre-event water. As the dynamic changes of soil DOM characteristics can be successfully captured using spectroscopic techniques, they may serve as a tracer for understanding hydrological paths based on their potential correlations with water source differences during rains. (c) 2017 Elsevier B.V. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000426349000040 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.imde.ac.cn/handle/131551/22513]  |
| 专题 | 成都山地灾害与环境研究所_山区发展研究中心 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
| 通讯作者 | Liu, Chen |
| 作者单位 | 1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xian, Qingsong,Li, Penghui,Liu, Chen,et al. Concentration and spectroscopic characteristics of DOM in surface runoff and fracture flow in a cropland plot of a loamy soil[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,622:385-393. |
| APA | Xian, Qingsong,Li, Penghui,Liu, Chen,Cui, Junfang,Guan, Zhuo,&Tang, Xiangyu.(2018).Concentration and spectroscopic characteristics of DOM in surface runoff and fracture flow in a cropland plot of a loamy soil.SCIENCE OF THE TOTAL ENVIRONMENT,622,385-393. |
| MLA | Xian, Qingsong,et al."Concentration and spectroscopic characteristics of DOM in surface runoff and fracture flow in a cropland plot of a loamy soil".SCIENCE OF THE TOTAL ENVIRONMENT 622(2018):385-393. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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