Concentration and spectroscopic characteristics of DOM in surface runoff and fracture flow in a cropland plot of a loamy soil

Xian, Qingsong1,2; Li, Penghui3; Liu, Chen1; Cui, Junfang1; Guan, Zhuo1; Tang, Xiangyu1

2018-05

10.1016/j.scitotenv.2017.12.010

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

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.

Soil Dissolved organic matter Hydrological process EEM fluorescence PARAFAC analysis

SCI ; EI

英语

其他

Institute of Mountain Hazards and Environment, CAS[SDS-135-1702]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000426349000040

ELSEVIER SCIENCE BV

20174904507093

Biogeochemistry ; Biological materials ; Dissolution ; Fluorescence ; Fracture ; Land use ; Organic carbon ; Rain ; Soil moisture ; Soils

Urban and Regional Planning and Development:403 ; Flood Control:442.1 ; Precipitation:443.3 ; Biological Materials and Tissue Engineering:461.2 ; Geochemistry:481.2 ; Soils and Soil Mechanics:483.1 ; Light/Optics:741.1 ; Chemical Operations:802.3 ; Organic Compounds:804.1 ; Materials Science:951

ENVIRONMENT/ECOLOGY

Web of Science

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

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.

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.

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.