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<p>Dissolved organic matter (DOM) is a vital component of the carbon cycle in freshwater ecosystems, including small water bodies such as urban ponds. This study investigated the effects of duckweed on DOM in such ponds. Field observations revealed that duckweed-covered ponds had reduced light penetration and oxygen availability, inhibiting DOM photodegradation and microbial degradation. Duckweed may also contribute to persistent DOM. A multi-property persistence index (PI) confirmed greater DOM persistence in duckweed-covered ponds, consistent with the optical property analysis. Laboratory experiments in which duckweed was removed or added showed that duckweed-covered water had higher dissolved organic carbon, chromophoric DOM, protein- and humic-like substances, and higher PI. These findings mirrored field results. Overall, reduced sunlight and oxygen in duckweed-covered ponds hinder DOM degradation; however, duckweed itself may also contribute to persistent DOM. These findings enhance the current understanding of DOM dynamics and biogeochemical processes in small inland waters with hydrophytes, especially in artificial freshwaters, such as urban ponds.</p>

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Influence of duckweed (Lemnaceae) on the characteristics of dissolved organic matter (DOM) in urban ponds

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Xinyue Zhang,
  • Sihua Zhu,
  • Xin Lan,
  • Shanyi Tian,
  • Jing Lu,
  • Junhao Tang,
  • Xiaolong Chen,
  • Li Gao,
  • Jitao Lv,
  • Yongguang Yin,
  • Guili Yang,
  • Tao Jiang,
  • Zhenwu Tang,
  • Dingyong Wang

摘要

Dissolved organic matter (DOM) is a vital component of the carbon cycle in freshwater ecosystems, including small water bodies such as urban ponds. This study investigated the effects of duckweed on DOM in such ponds. Field observations revealed that duckweed-covered ponds had reduced light penetration and oxygen availability, inhibiting DOM photodegradation and microbial degradation. Duckweed may also contribute to persistent DOM. A multi-property persistence index (PI) confirmed greater DOM persistence in duckweed-covered ponds, consistent with the optical property analysis. Laboratory experiments in which duckweed was removed or added showed that duckweed-covered water had higher dissolved organic carbon, chromophoric DOM, protein- and humic-like substances, and higher PI. These findings mirrored field results. Overall, reduced sunlight and oxygen in duckweed-covered ponds hinder DOM degradation; however, duckweed itself may also contribute to persistent DOM. These findings enhance the current understanding of DOM dynamics and biogeochemical processes in small inland waters with hydrophytes, especially in artificial freshwaters, such as urban ponds.