Scholarlink

<p>Dissolved acidic polysaccharides (dAPS) and chromophoric dissolved organic matter (CDOM) are both present in aquatic environments and contribute significantly to the dissolved organic carbon pool, whereas the dAPS released from different typical macrophytes and their possible link with CDOM remain uncertain. We conducted an experiment to investigate the changes in dAPS and CDOM derived from five aquatic macrophytes (including two floating and three submerged macrophytes) in the Poyang Lake Nanji wetlands. Macrophytes released dAPS rapidly during the first 4 or 7 d, showing that the production of dAPS from macrophytes was rapid. The floating macrophytes released much more dAPS, CDOM(<i>a</i>(254)), CDOM fluorescence components and dissolved organic carbon (DOC) than submerged macrophytes; however, submerged macrophyte-derived dAPS contributed more to DOC. Generally, macrophyte-derived dAPS accounted for about 10.9% of the released DOC. Spearman’s correlations and linear (mixed) model analysis demonstrated that macrophyte-derived dAPS were significantly associated with the quantity of released CDOM, and the relationship was dependent on the species. These results will help to better understand the characteristics of DOM in natural waters and associated environmental implications.</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

Dissolved acidic polysaccharides and chromophoric dissolved organic matter derived from macrophytes: links and implications for carbon cycling

  • 期刊论文

  • 发表日期：

    2025年11月21日

查看全文
  • Qi Huang,
  • Chunxia Huang,
  • Lizhen Liu,
  • Dongyu Li

摘要

Dissolved acidic polysaccharides (dAPS) and chromophoric dissolved organic matter (CDOM) are both present in aquatic environments and contribute significantly to the dissolved organic carbon pool, whereas the dAPS released from different typical macrophytes and their possible link with CDOM remain uncertain. We conducted an experiment to investigate the changes in dAPS and CDOM derived from five aquatic macrophytes (including two floating and three submerged macrophytes) in the Poyang Lake Nanji wetlands. Macrophytes released dAPS rapidly during the first 4 or 7 d, showing that the production of dAPS from macrophytes was rapid. The floating macrophytes released much more dAPS, CDOM(a(254)), CDOM fluorescence components and dissolved organic carbon (DOC) than submerged macrophytes; however, submerged macrophyte-derived dAPS contributed more to DOC. Generally, macrophyte-derived dAPS accounted for about 10.9% of the released DOC. Spearman’s correlations and linear (mixed) model analysis demonstrated that macrophyte-derived dAPS were significantly associated with the quantity of released CDOM, and the relationship was dependent on the species. These results will help to better understand the characteristics of DOM in natural waters and associated environmental implications.