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<p>The river-reservoir continuum is a key area for important water sources and receiving water bodies. Dissolved organic matter (DOM) is an important factor affecting the water quality and aquatic ecological health in the continuum. However, there is currently a lack of research and quantification of the contributions of abiotic and biotic factors to DOM in the continuum during algal proliferation. In this study, single-turnover active chlorophyll fluorescence (LabSTAF) was used to obtain the photosynthetic characteristics of algae. At the same time, the sources of DOM were analyzed by combining three-dimensional fluorescence spectra with parallel factor analysis, and various statistical methods were used to deeply explore the impact mechanisms of abiotic and biotic factors on DOM. The results show that water temperature (WT), pH, and DO drive algal growth in the inflow river. The algal density in the estuary area did not increase significantly, but it has a high production potential; algae proliferated significantly in the backwater area, but their photosynthetic activity was inhibited by WT. Algal proliferation increased the DOC concentration in the inflow river. The river is dominated by humic-like components (C1+C2), followed by protein-like components (C3+C4); the fluorescence concentration of DOM shows a decreasing trend from the estuary to the backwater area. Algal proliferation significantly changed the sources of DOM in the river, with strong endogenous characteristics in the later stage of proliferation. The results of mixed-effect models and partial least squares structural equation modeling show that biotic and environmental factors together explain 73%, 76%, 49%, and 41% of the variations in C1, C2, C3, and C4, respectively. In addition, the photochemical flux per unit volume (JV<sub>PII</sub>) is a key factor for algae to indirectly drive DOM changes through photosynthetic activity. This study is of great significance for a deeper understanding of the biogeochemical cycling of DOM in the river-reservoir area.</p>

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Algal proliferation in inflow rivers of large reservoirs and its influence on dissolved organic matter

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Zhijie Liu,
  • Hao Liu,
  • Chao Wang,
  • Liqing Li

摘要

The river-reservoir continuum is a key area for important water sources and receiving water bodies. Dissolved organic matter (DOM) is an important factor affecting the water quality and aquatic ecological health in the continuum. However, there is currently a lack of research and quantification of the contributions of abiotic and biotic factors to DOM in the continuum during algal proliferation. In this study, single-turnover active chlorophyll fluorescence (LabSTAF) was used to obtain the photosynthetic characteristics of algae. At the same time, the sources of DOM were analyzed by combining three-dimensional fluorescence spectra with parallel factor analysis, and various statistical methods were used to deeply explore the impact mechanisms of abiotic and biotic factors on DOM. The results show that water temperature (WT), pH, and DO drive algal growth in the inflow river. The algal density in the estuary area did not increase significantly, but it has a high production potential; algae proliferated significantly in the backwater area, but their photosynthetic activity was inhibited by WT. Algal proliferation increased the DOC concentration in the inflow river. The river is dominated by humic-like components (C1+C2), followed by protein-like components (C3+C4); the fluorescence concentration of DOM shows a decreasing trend from the estuary to the backwater area. Algal proliferation significantly changed the sources of DOM in the river, with strong endogenous characteristics in the later stage of proliferation. The results of mixed-effect models and partial least squares structural equation modeling show that biotic and environmental factors together explain 73%, 76%, 49%, and 41% of the variations in C1, C2, C3, and C4, respectively. In addition, the photochemical flux per unit volume (JVPII) is a key factor for algae to indirectly drive DOM changes through photosynthetic activity. This study is of great significance for a deeper understanding of the biogeochemical cycling of DOM in the river-reservoir area.