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Seasonal Variations of Dissolved Organic Matter by Fluorescent Analysis in a Typical River Catchment in Northern China

机译：中国北方典型河流集水区荧光分析季节性变化

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Fluorescence (excitation-emission matrices, EEMs) spectroscopy coupled with PARAFAC (parallel factor) modelling and UV-Vis (ultraviolet visible) spectra were used to ascertain the sources, distribution and biogeochemical transformation of dissolved organic matter (DOM) in the Duliujian River catchment. Dissolved organic carbon (DOC), chromophoric dissolved organic matter (a335) (CDOM), and hydrophobic components (a260) were higher in summer than in other seasons with 53.3 m−1, while aromaticity (SUVA254) was higher in spring. Four fluorescent components, namely terrestrial humic acid (HA)-like (A/C), terrestrial fulvic acid (FA)-like (A/M), autochthonous fulvic acid (FA)-like (A/M), and protein-like substances (Tuv/T), were identified using EEM-PARAFAC modelling in this river catchment. The results demonstrated that terrestrial HA-like substances enhance its contents in summer ARE compared with BRE, whilst terrestrial FA-like substances were newly input in summer ARE, which was entirely absent upstream and downstream, suggesting that rain events could significantly input the terrestrial soil-derived DOM in the ambient downward catchments. Autochthonous FA-like substances in summer BRE could derive from phytoplankton in the downstream waters. The results also showed that DOM from wetland exhibited lower fluorescent intensity of humic-like peak A/C and fulvic-like peak A/M, molecular weight (SR) and humification index (HIX) during the low-flow season. Built-up land, cropland, and unused land displayed higher a335 (CDOM). A higher proportion of forest and industrial land in the SCs showed higher SUVA254 values. Humic-like moiety, molecular weight and aromaticity were more responsive to land use during stormflow in summer. Rainfall could increase the export of soil DOM from cropland and unused land, which influences the spatial variation of HIX. The results in this study highlighted that terrestrial DOM has a significant influence on the biogeochemical alterations of DOM compositions and thus water quality in the downward watershed catchments, which might significantly vary according to the land-use types and their alterations by human activities.
机译：荧光（激发排放矩阵，EEM）与PARAFAC（平行因子）建模和UV-VIS（紫外线）谱偶联的光谱法用于确定Duliujian River集水区中溶解有机物质（DOM）的来源，分布和生物地球化学转化。溶解有机碳（DOC），发色团溶解有机物（A335）（CDOM），夏季疏水成分（A260）高于其他53.3 m-1的季节，而春季芳香性（SUVA254）较高。四种荧光组分，即陆地腐殖酸（HA） - 麦克风（A / C），陆地富核酸（FA） - 麦克风（A / M），自加湿富含呋喃酸（FA） - 样（A / M）和蛋白质 - 使用该河流集水区中的EEM-PARAFAC型鉴定物质（TUV / T）。结果表明，陆地HA样物质在夏季增强其含量，而夏季新投入的夏季，陆地FA样物质是完全没有上游和下游的，这表明雨雨事件可能会显着输入陆地土壤在环境向下集水区中的多分之一。夏季BRE的自身加湿的FA样物质可以从下游水域中获得浮游植物。结果还表明，在低流量季节期间，来自湿地的DOM表现出较低的腐殖质峰A / C和富含峰值A / M，分子量（SR）和湿度指数（HIX）的荧光强度。建筑陆地，农田和未使用的土地显示较高的A335（CDOM）。 SCS中的森林和工业用地比例较高显示出较高的SUVA254值。蜂窝状部分，分子量和芳香性在夏季风暴流出期间的土地利用更加响应。降雨量可以增加农田和未使用的土地的土壤中的出口，这影响了HIX的空间变化。该研究的结果突出显示，陆地DOM对DOM组合物的生物地球化学改变产生了重大影响，从而对向下流域集水区中的水质可能会根据土地使用类型和人类活动的改变而显着变化。

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