高度城市化的长江三角洲地区河湖沉积物中有机碳和氮的来源分配。

Journal of hazardous materials Pub Date : 2024-10-05 Epub Date: 2024-08-22 DOI:10.1016/j.jhazmat.2024.135590
Yalong Li, Yaojen Tu, Tingting Sun, Yanping Duan, Jiayi Kou, Weikun Li, Jiaxin Gao
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引用次数: 0

摘要

人类活动对有机物污染的影响已得到公认,但这些影响在长江三角洲地区如何随季节变化还需要进一步研究。本研究针对这一空白,调查了长江三角洲沉积物中有机质来源的季节性变化以及人类活动的生态响应。研究分析了从太浦河和大连湖湿地采集的表层沉积物中的总有机碳(TOC)、总氮(TN)、碳(δ13C)和氮(δ15N)同位素组成。与大连湖相比,太浦河的TOC和TN浓度分别平均高出0.46%和0.03%。此外,在雨季,两个水体的有机物指数(OI)和有机氮指数(ON)均有所升高。大连湖的沉积物仍处于未受污染到中度污染的状态,而太浦河的沉积物则普遍处于中度污染到重度污染的状态。稳定同位素分析表明,陆生 C3 植物(平均占 25.5%)、C4 植物(平均占 16.0%)和城市污水(平均占 16.0%)是沉积物中有机物的主要来源。这些发现表明,陆生植物材料和城市污水是治理长江三角洲有机物污染的主要目标。实施战略性土地利用规划和有针对性的干预措施,最大限度地减少这些输入,可以显著改善水质和生态系统健康。
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Source apportionment of organic carbon and nitrogen in sediments from river and lake in the highly urbanized Changjiang Delta.

While the impact of human activities on organic matter pollution is recognized, how these impacts vary seasonally in the Changjiang Delta needs further investigation. This study addresses this gap by investigating seasonal variations in organic matter sources and ecological responses to human activities in Changjiang Delta sediments. Total organic carbon (TOC), total nitrogen (TN), and carbon (δ13C) and nitrogen (δ15N) isotopic compositions of surface sediments collected from the Taipu River and Dalian Lake wetland were analyzed. Both water bodies exhibited similar seasonal trends for TOC and TN, with the Taipu River containing an average of 0.46% and 0.03% higher concentrations of TOC and TN, respectively, compared to Dalian Lake. Additionally, the organic index (OI) and organic nitrogen (ON) index were elevated in both water bodies during the wet season. Sediments from Dalian Lake remained uncontaminated to moderately contaminated, while those from the Taipu River were generally classified as moderately to heavily contaminated. Stable isotope analysis identified terrestrial C3 plants (averaging 25.5%), C4 plants (averaging 16.0%), and municipal wastewater (averaging 16.0%) as the main contributors to organic matter in the sediments. These findings suggest that terrestrial plant material and municipal wastewater are key targets for managing organic matter contamination in the Changjiang Delta. Implementing strategic land-use planning and targeted interventions to minimize these inputs can significantly improve water quality and ecosystem health.

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