Scholarlink

<p>The release of phosphorus from sediments is a critical driver of water eutrophication, yet its dynamics and impact on surface water quality of different water layers in river systems remain understudied. As an important basin ecosystem in Northern China, the Liaohe River undertakes key functions such as regional water resource supply, agricultural irrigation, and maintenance of ecological balance, and its water quality directly affects the production and life of residents in the basin and ecological security. This study investigated the release characteristics and influencing factors of different phosphorus forms (total phosphorus, TP; phosphate, PO<sub>4</sub><sup>3−</sup>) in the Liaohe River, a typical agricultural area of Northern China, using static simulation and statistical analyses. Results revealed significant spatial and temporal variations in phosphorus release: TP exhibited rapid early release followed by stabilization, with release rates of 0.0097–0.0150&#xa0;mg/(m<sup>2</sup>·d) (upstream), 0.0112–0.0223&#xa0;mg/(m<sup>2</sup>·d) (downstream), and the highest 0.0316–0.0342&#xa0;mg/(m<sup>2</sup>·d) (midstream), showing a "high-middle and low-ends" spatial pattern. Environmental factors—temperature (25–30&#xa0;°C), pH (7–9), light, and hydrodynamic disturbances—synergistically enhanced phosphorus release, with hydrodynamic forces exerting the most pronounced effect. Correlation analysis and RDA analysis confirmed that PO<sub>4</sub><sup>3−</sup> in pore water correlated strongly with overlying water nutrient levels (<i>r</i> = 0.60,&#xa0;<i>p</i> &lt; 0.05), indicating its pivotal role in eutrophication. PO<sub>4</sub><sup>3−</sup> in pore water can serve as a key indicator for water quality monitoring. This study underscores the necessity of addressing internal phosphorus loading alongside external controls to mitigate eutrophication in riverine ecosystems. The management approach must shift from a total phosphorus-centered method to targeted phosphate ion control, while integrating sediment remediation and hydrological regulation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Release Characteristics of Phosphorus in Different Water Layers and its Relationship with Water Nutrient Status of a Typical River in Northern China

  • 期刊论文

  • 发表日期：

    2026年1月28日

查看全文
  • Rui Xue,
  • Qiuying Chen,
  • Yuexuan Wang,
  • Qi Wang,
  • Xiuzhong Li

摘要

The release of phosphorus from sediments is a critical driver of water eutrophication, yet its dynamics and impact on surface water quality of different water layers in river systems remain understudied. As an important basin ecosystem in Northern China, the Liaohe River undertakes key functions such as regional water resource supply, agricultural irrigation, and maintenance of ecological balance, and its water quality directly affects the production and life of residents in the basin and ecological security. This study investigated the release characteristics and influencing factors of different phosphorus forms (total phosphorus, TP; phosphate, PO43−) in the Liaohe River, a typical agricultural area of Northern China, using static simulation and statistical analyses. Results revealed significant spatial and temporal variations in phosphorus release: TP exhibited rapid early release followed by stabilization, with release rates of 0.0097–0.0150 mg/(m2·d) (upstream), 0.0112–0.0223 mg/(m2·d) (downstream), and the highest 0.0316–0.0342 mg/(m2·d) (midstream), showing a "high-middle and low-ends" spatial pattern. Environmental factors—temperature (25–30 °C), pH (7–9), light, and hydrodynamic disturbances—synergistically enhanced phosphorus release, with hydrodynamic forces exerting the most pronounced effect. Correlation analysis and RDA analysis confirmed that PO43− in pore water correlated strongly with overlying water nutrient levels (r = 0.60, p < 0.05), indicating its pivotal role in eutrophication. PO43− in pore water can serve as a key indicator for water quality monitoring. This study underscores the necessity of addressing internal phosphorus loading alongside external controls to mitigate eutrophication in riverine ecosystems. The management approach must shift from a total phosphorus-centered method to targeted phosphate ion control, while integrating sediment remediation and hydrological regulation.