Relationships between the spectral characteristics of dissolved organic matter and river ecological health indicators: A case study in the Shichuan River basin on a typical semi-arid and semi-humid region of China

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Ecological Indicators Pub Date : 2024-11-14 DOI:10.1016/j.ecolind.2024.112836

Daoping Xi , En Hu , Ming Li , Jian Gao

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Abstract

The spectral characteristics of dissolved organic matter (DOM) in rivers are considered as potential indicators of river health status. In this study, relationships between DOM spectral properties and river ecological health indicators in Shichuan River, such as total nitrogen (TN), total phosphorus (TP), chlorophyll-a (Chl-a) content, diversity of macrobenthic invertebrates, water quality index (WQI), and trophic level index (TLI), etc., were investigated. According to the WQI values, the water quality of the Ju River and Taoqupo Reservoir was generally better than that of other river sections, while the Qinghe and the mainstream sections performed the worst. The fluorescence index (FI) and WQI reflects that the mainstream of the Shichuan River bears a significant amount of sewage input. Besides, FI showed a significant positive correlation with nitrate nitrogen (NO₃⁻-N), TN, TP, Chl-a, and TLI, while a significant negative correlation with WQI. The specific ultraviolet absorbance of 254 nm (SUVA₂₅₄) had a positive correlation with TLI. Indeed, the UVC humic-like component (C1) showed a significant positive correlation with the macroinvertebrates diversity. The humification index (HIX) was significantly negatively correlated with sediment pollution index. Our results suggested that DOM fluorescence characteristics had the potential to be developed as a convenient method for assessing aquatic ecological health.

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溶解有机物光谱特征与河流生态健康指标之间的关系：中国典型半干旱半湿润地区石川河流域的案例研究

河流中溶解有机物（DOM）的光谱特性被认为是河流健康状况的潜在指标。本研究探讨了石川河溶解有机物光谱特性与总氮（TN）、总磷（TP）、叶绿素a（Chl-a）含量、大型底栖无脊椎动物多样性、水质指数（WQI）、营养级指数（TLI）等河流生态健康指标之间的关系。根据 WQI 值，莒河和桃曲坡水库的水质总体好于其他河段，而清河和主流河段的水质最差。荧光指数（FI）和水质指数（WQI）反映出石川河主流有大量污水输入。此外，FI 与硝酸盐氮（NO3--N）、TN、TP、Chl-a 和 TLI 呈显著正相关，而与 WQI 呈显著负相关。254 纳米比紫外吸收率（SUVA254）与 TLI 呈正相关。事实上，紫外线腐殖样成分（C1）与大型无脊椎动物多样性呈显著正相关。腐殖化指数（HIX）与沉积物污染指数呈显著负相关。我们的研究结果表明，DOM 荧光特征有可能发展成为一种评估水生生态健康的便捷方法。

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来源期刊

Ecological Indicators 环境科学-环境科学

CiteScore

11.80

自引率

8.70%

发文量

1163

审稿时长

78 days

期刊介绍： The ultimate aim of Ecological Indicators is to integrate the monitoring and assessment of ecological and environmental indicators with management practices. The journal provides a forum for the discussion of the applied scientific development and review of traditional indicator approaches as well as for theoretical, modelling and quantitative applications such as index development. Research into the following areas will be published. • All aspects of ecological and environmental indicators and indices. • New indicators, and new approaches and methods for indicator development, testing and use. • Development and modelling of indices, e.g. application of indicator suites across multiple scales and resources. • Analysis and research of resource, system- and scale-specific indicators. • Methods for integration of social and other valuation metrics for the production of scientifically rigorous and politically-relevant assessments using indicator-based monitoring and assessment programs. • How research indicators can be transformed into direct application for management purposes. • Broader assessment objectives and methods, e.g. biodiversity, biological integrity, and sustainability, through the use of indicators. • Resource-specific indicators such as landscape, agroecosystems, forests, wetlands, etc.