北江干流及主要支流水质及其时空变化特征
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X522

基金项目:

广东省省级科技计划项目“农业面源污染绿色防控生态农场应用与示范”(2022B0202160007); 广东省自然科学基金项目“沼渣生物炭限域单原子铁活化过硫酸盐降解抗生素的效能及机制”(2022A1515010807); 广东省重点领域研发计划项目(2020B1111350001)


Water Quality and Spatial-temporal Variation Characteristics from Main Stream and Main Tributaries of North River
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    摘要:

    [目的] 分析2020年北江干流及主要支流监测断面的水质情况,为北江水环境监控及保护提供参考依据。[方法] 采用单因子评价法和主成分分析法,研究北江水质时空变化趋势及驱动因素。[结果] 2020年北江监测断面整体水质良好,仅水车头、漫水河河口、黄浪水桥、龙归断面水质为Ⅲ—Ⅳ类,其他断面均为Ⅱ类。北江水温和溶解氧受季节影响较大,水体全年基本保持弱碱性,下游营养盐和有机物污染程度高于上、中游。[结论] 由空间分析结果可知,下游水质劣于上、中游,其主要的影响因素是营养盐和溶解氧,pH值单独作用不会对水质产生明显影响。季节污染程度排序为:夏季>秋季>春季>冬季,其中全河段的水质主导因素为溶解氧,而下游河段的主导因素为营养盐和有机物。

    Abstract:

    [Objective] The water quality of the main stream and main tributary monitoring sections of the North River in 2020 was analyzed in order to provide a reference and basis for monitoring and protecting the water environment of the North River. [Methods] The single factor evaluation method and principal component analysis were used to determine the spatial and temporal trends and driving factors of water quality for the North River. [Results] In 2020, the overall water quality of the North River monitoring sections was good. Only the sections of Shuichetou, Manshui River estuary, Huanglongshui Bridge, and Longgui met the standards for water quality grades Ⅲ—Ⅳ, and the other sections were determined to be grade Ⅱ. Water temperature and dissolved oxygen in the North River were influenced by the seasons. The water body basically remained weakly alkaline throughout the year, and the pollution levels of nutrients and organic matter were higher downstream than at upstream and midstream locations. [Conclusion] Spatial analysis showed that downstream water quality was worse than upstream and midstream water quality. The main influencing factors were nutrients and dissolved oxygen. pH value alone did not have a significant impact on water quality. The seasonal pollution degree followed the order of summer > autumn > spring > winter. The dominant factor on water quality for the entire river was dissolved oxygen, while the dominant factors for the downstream river section were nutrients and organic matter.

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周铭浩,李彤,林学明,叶四化,张雪容,邓滢.北江干流及主要支流水质及其时空变化特征[J].水土保持通报,2023,43(5):111-120,127

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  • 收稿日期:2023-01-13
  • 最后修改日期:2023-03-14
  • 在线发布日期: 2023-11-30