Temporal and spatial changes in dissolved organic carbon concentration and fluorescence intensity of fulvic acid like materials in mountainous headwater catchments

Terajima, Tomomi; Moriizumi, Mihoko

doi:10.1016/j.jhydrol.2012.10.023

Cited by 16 publications

(11 citation statements)

References 37 publications

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“…Concurrent, increased soil water, surface and shallow subsurface flow may favour increased soil DOC leaching to downslope surface waters (Monteith et al, 2006;Neff and Asner, 2001;Sanderman et al, 2009). In mountainous catchments the latter flow paths are likely due to the steepness of the catchment slopes (Boyer et al, 1997;Sakamoto et al, 1999;Terajima and Moriizumi, 2013). The missing signal of forest disturbance on DOC concentrations at weir 1 even shortly after the disturbance may be due to the minor extension of the disturbed area, the minor increase of surface and shallow subsurface flow due to the relative low slope of the disturbed area, the buffering of increased topsoil DOC leaching due to absorption of DOC within the subsoil (Borken et al, 2011;Huber et al, 2004), missing DOC-rich riparian source areas (i.e.…”

Section: Impact Of Stormsmentioning

confidence: 99%

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

et al. 2016

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Abstract. Karst systems are important for drinking water supply. Future climate projections indicate increasing temperature and a higher frequency of strong weather events. Both will influence the availability and quality of water provided from karst regions. Forest disturbances such as windthrow can disrupt ecosystem cycles and cause pronounced nutrient losses from the ecosystems. In this study, we consider the time period before and after the wind disturbance period (2007/08) to identify impacts on DIN (dissolved inorganic nitrogen) and DOC (dissolved organic carbon) with a process-based flow and solute transport simulation model. When calibrated and validated before the disturbance, the model disregards the forest disturbance and its consequences on DIN and DOC production and leaching. It can therefore be used as a baseline for the undisturbed system and as a tool for the quantification of additional nutrient production. Our results indicate that the forest disturbance by windthrow results in a significant increase of DIN production lasting ∼ 3.7 years and exceeding the pre-disturbance average by 2.7 kg ha −1 a −1 corresponding to an increase of 53 %. There were no significant changes in DOC concentrations. With simulated transit time distributions we show that the impact on DIN travels through the hydrological system within some months. However, a small fraction of the system outflow (< 5 %) exceeds mean transit times of > 1 year.

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Section: Impact Of Stormsmentioning

confidence: 99%

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

et al. 2016

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“…A number of investigators have suggested that dissolved organic carbon (DOC) may be flushed into the river during flood events as elevated water tables mobilize DOC from organic rich soil horizons within the near channel deposits [56][57][58][59]. DOC may also be derived from hillslope soil horizons [60][61][62] as water tables rise into the organic-rich surface layers, or from hillslope soils that receive runoff from bedrock outcrops covered in organic matter [63]. Thus, we hypothesis that the darkening of the river water was associated with the influx of NOM via runoff through the organic litter layer at the forest floor or through the shallow groundwater system.…”

Section: Controls On Turbiditymentioning

confidence: 99%

Controls on Suspended Sediment Concentrations and Turbidity within a Reforested, Southern Appalachian Headwater Basin

Miller

Sinclair

Walsh

2015

Water

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Water quality data collected between 2007 and 2014 within the Allen Creek Watershed were used to: (1) determine the factors controlling the temporal variations in turbidity and suspended sediment concentration (SSC) within a representative, high-gradient headwater basin in the Southern Appalachians; and (2) assess the recovery of water quality following extensive logging operations during the early to mid-1900s. Regression analysis suggests that suspended sediment is primarily derived from upland areas and variations in concentration reflect rainfall intensity and total event precipitation. Overall, SSC and turbidity were low in stream waters in comparison to both reference values for stable streams and more developed basins in the region. Some floods were characterized by high SSC values, but limited turbidity and vice versa. Differences in measured SSC and turbidity between storms reflect different controls on the two parameters, and the apparent influence of natural organic matter on turbidity during rainfall events that are incapable of transporting sediment to the channel via overland flow. Low SSC and turbidity values are presumably related to the reforestation of hillslopes and riparian buffers following the cessation of logging operations. They also are due to a historical reduction in the sedimentological connectivity of hillslopes and tributaries with the axial channel that occurred during logging operations. OPEN ACCESSWater 2015, 7 3124

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“…[3] It affects the transportation of colloidal and ionic species, heavy metals and radionuclides by complexation, and is also important for the bioavailability and photodegradation of organic pollutants and nutrients. [4][5][6][7][8] Therefore, it is important to understand the composition and properties of FA for further insight into its role in aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

Comparative characterisation of two fulvic acids from East Lake and Liangzi Lake in central China

Wang

Chen

et al. 2015

Environ. Chem.

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Environmental context. Fulvic acids account for a large proportion of dissolved organic matter in aquatic environments and affect the transportation and bioavailability of organic and inorganic pollutants. The structural and spectroscopic characteristics of fulvic acids mainly depend on the sources, seasons and anthropogenic activity. We present an advanced approach using fluorescence spectroscopy as a rapid and cost-effective method to investigate the composition, properties and origins of fulvic acids.Abstract. Fulvic acids (FAs) isolated seasonally from the sediments of East Lake and Liangzi Lake in central China were comparatively investigated. The structural features of the FAs were characterised using chemical and spectroscopic methods, including elemental analysis, UV-Vis spectroscopy, Fourier-transform infrared (FT-IR) spectroscopy, and threedimensional excitation emission matrix (EEM) fluorescence spectroscopy coupled with parallel factor analysis (PARAFAC). The O/C, (O þ N)/C and C/N ratios of FA extracted from Liangzi Lake (FA L ) were higher than those of FA extracted from East Lake (FA E ), indicating higher oxygen-containing functionality and polarity and less nutrient in FA L compared with FA E . The two FAs had similar UV-Vis spectra with different absorbance intensities. The FT-IR spectra showed that the two FAs had similar functional groups. The total fluorescence intensity and aromaticity of samples from Liangzi Lake were higher than those of East Lake except for those taken in the summer. The two FAs were largely terrestrially derived organic materials. Five fluorescent components, including four humic-like and two fulvic-like components, were identified by PARAFAC modelling of the EEM spectral data. The fluorescence was dominated by two components. The findings suggest that EEM fluorescence spectroscopy together with PARAFAC is a rapid and costeffective method for understanding the characteristics and origins of FAs in natural water systems.

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Temporal and spatial changes in dissolved organic carbon concentration and fluorescence intensity of fulvic acid like materials in mountainous headwater catchments

Cited by 16 publications

References 37 publications

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

Controls on Suspended Sediment Concentrations and Turbidity within a Reforested, Southern Appalachian Headwater Basin

Comparative characterisation of two fulvic acids from East Lake and Liangzi Lake in central China

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