[Analysis the Source and Spatiotemporal Variation of Dissolved Organic Matter in the Chaohe River Watershed].

Q2 Environmental Science
Zhuo-Ni Ma, Chun-Zi Guo, Hao Zhang, Shuang Song, Yao-Qi Gong, Chen-Yang Shou, Fu-Jun Yue
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引用次数: 0

Abstract

Dissolved organic matter (DOM) is widespread in aquatic environments and plays a crucial role in various biogeochemistry processes. Urbanization and anthropogenic activities have significantly altered the source and characteristics of DOM in rivers. Therefore, analyzing the spatial and temporal variation of DOM on a watershed scale to trace its source for effective water quality management is important. In this study, the composition characteristics of DOM in the Chaohe River watershed, which is the source of drinking water in northern China, were analyzed using the EEM-PARAFAC method. Furthermore, the source of DOM was further identified by analyzing the relationships among optical parameters. The results revealed the four components in DOM: component 1 resembled fulvic acid, while component 2 and component 4 exhibited characteristics similar to those of humic compounds. Component 3 displayed tryptophan-like acidity, with the highest intensity observed during both high and low flow periods. Temporal and spatial variation in fluorescence parameters further indicated a distinct source of DOM across the three water periods. Notably, non-point source pollution was prominent during the low water period, whereas soil-related characteristics dominated during the flood season. Spatial analysis revealed that under natural vegetation cover, terrestrial detritus significantly influenced DOM originating from the source area. However, urbanization-induced anthropogenic pollution had become more pronounced in the middle reaches. Additionally, the downstream area with extensive aquatic vegetation coverage experienced notable impacts from phytoplankton proliferation. Correlation analysis demonstrated varying degrees of association between water environmental parameters, nitrogen and phosphorus content, optical parameters, and DOM across three hydrological periods. These findings revealed that water environment dynamics and nutrient sources govern the temporal and spatial distribution patterns of DOM.

[潮河流域溶解有机物来源及时空变化分析]。
溶解有机物(DOM)广泛存在于水生环境中,在各种生物地球化学过程中起着至关重要的作用。城市化和人类活动显著改变了河流DOM的来源和特征。因此,分析流域尺度上DOM的时空变化规律,追踪其来源,对有效的水质管理具有重要意义。本研究采用EEM-PARAFAC方法对中国北方饮用水源地潮河流域DOM的组成特征进行了分析。此外,通过分析光学参数之间的关系,进一步确定了DOM的来源。结果表明,DOM中组分1具有黄腐酸的特征,组分2和组分4具有腐植酸的特征。组分3呈现色氨酸样酸性,在高流量和低流量期间均表现出最高强度。荧光参数的时空变化进一步表明DOM在三个水期的来源不同。非点源污染在枯水期表现突出,而土壤相关特征在汛期表现突出。空间分析表明,在自然植被覆盖下,陆源碎屑对源区DOM的影响显著。然而,城市化引起的人为污染在中游地区更为明显。此外,下游水域植被覆盖较广的地区,浮游植物增殖的影响显著。相关分析表明,水环境参数、氮磷含量、光学参数和DOM在三个水文期之间存在不同程度的相关性。这些结果表明,水环境动态和养分来源决定了DOM的时空分布格局。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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