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<p>Colored Dissolved Organic Matter (CDOM) is a key factor affecting the optical properties and ecosystem of shallow lakes. However, comprehensive understanding of its spatiotemporal distribution, sources and interactions with environmental factors is limited. This study combined 3D fluorescence spectroscopy, Parallel Factor Analysis (PARAFAC) and UV–visible spectroscopy to investigate CDOM structural characteristics and sources in Gehu Lake, a typical shallow lake in China’s Taihu Basin. The research findings indicate: The Fluorescent Dissolved Organic Matter (FDOM) of Gehu Lake water consist of three types: C1 (λ<sub>Ex</sub>/λ<sub>Em</sub> = 255, 350 nm/455 nm) (UVC Humic-like), C2 (λ<sub>Ex</sub>/λ<sub>Em</sub> = 255, 300 nm/385 nm) (UVA Humic-like), and C3 (λ<sub>Ex</sub>/λ<sub>Em</sub> = 275 nm/325 nm) (tryptophan-like). During the High Water Period (HWP), CDOM exhibits high concentrations, high humic degree, and a predominance of macromolecular structures. In the Low Water Period (LWP), CDOM is characterized by low concentrations, low humic, and a predominance of small-molecule structures. During the Normal Water Period (NWP), all characteristics fall between those of HWP and LWP. The composition and structure of CDOM in Gehu Lake are primarily influenced by external inputs and internal releases. During HWP, the sources of CDOM are influenced by both internal and external factors, while During NWP, internal release is the primary contributor. During LWP, CDOM sources are primarily external inputs. This study clearly reveals the spatiotemporal heterogeneity and influencing factors of the structure and sources of CDOM in Gehu Lake, providing crucial scientific evidence for deepening our understanding of the geochemical cycling processes of CDOM in shallow lakes.</p>

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Spatiotemporal Dynamics and Source of CDOM in Gehu Lake, Taihu Basin, China

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Cheng Gu,
  • Tao Song,
  • Jiehong Cheng,
  • Xiangen Xu

摘要

Colored Dissolved Organic Matter (CDOM) is a key factor affecting the optical properties and ecosystem of shallow lakes. However, comprehensive understanding of its spatiotemporal distribution, sources and interactions with environmental factors is limited. This study combined 3D fluorescence spectroscopy, Parallel Factor Analysis (PARAFAC) and UV–visible spectroscopy to investigate CDOM structural characteristics and sources in Gehu Lake, a typical shallow lake in China’s Taihu Basin. The research findings indicate: The Fluorescent Dissolved Organic Matter (FDOM) of Gehu Lake water consist of three types: C1 (λEx/λEm = 255, 350 nm/455 nm) (UVC Humic-like), C2 (λEx/λEm = 255, 300 nm/385 nm) (UVA Humic-like), and C3 (λEx/λEm = 275 nm/325 nm) (tryptophan-like). During the High Water Period (HWP), CDOM exhibits high concentrations, high humic degree, and a predominance of macromolecular structures. In the Low Water Period (LWP), CDOM is characterized by low concentrations, low humic, and a predominance of small-molecule structures. During the Normal Water Period (NWP), all characteristics fall between those of HWP and LWP. The composition and structure of CDOM in Gehu Lake are primarily influenced by external inputs and internal releases. During HWP, the sources of CDOM are influenced by both internal and external factors, while During NWP, internal release is the primary contributor. During LWP, CDOM sources are primarily external inputs. This study clearly reveals the spatiotemporal heterogeneity and influencing factors of the structure and sources of CDOM in Gehu Lake, providing crucial scientific evidence for deepening our understanding of the geochemical cycling processes of CDOM in shallow lakes.