Characterization of Chromophoric Dissolved Organic Matter in the Littoral Zones of Eutrophic Lakes Taihu and Hongze during the Algal Bloom Season
| Autor: | Cheng Liu, Muhua Feng, Kaining Chen, Gu Xiaozhi, Ma Shuzhan, Bingfa Chen, Wei Huang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Biogeochemical cycle
excitation emission matrix spectroscopy lcsh:Hydraulic engineering 010504 meteorology & atmospheric sciences Geography Planning and Development 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry Algal bloom lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 Dissolved organic carbon Littoral zone 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 eutrophic lake chromophoric dissolved organic matter Humus Colored dissolved organic matter Productivity (ecology) Environmental chemistry littoral zone Environmental science Eutrophication |
| Zdroj: | Water, Vol 10, Iss 7, p 861 (2018) Water Volume 10 Issue 7 |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w10070861 |
| Popis: | Chromophoric dissolved organic matter (CDOM) is a key component with a critical role in the littoral zones of eutrophic shallow lakes yet the characteristics of CDOM in these zones remain seldom systematically reported. In this study, the differences in sources, biogeochemical characteristics, and fates of CDOM between the littoral zones of eutrophic lakes Taihu (LLT frequently occurring algal blooms and longer lake residence time) and Hongze (LLH no obvious algal blooms and shorter residence time) were compared during the algal bloom season using ultraviolet-visible spectra and excitation and emission matrix spectroscopy combined with parallel factor analysis. Three humic-like fluorescent dissolved organic matter (FDOM) components (C1, C3, and C4) and one protein-like component (C2) were identified. Results showed that FDOM components were dominated by protein-like fluorescent substances in LLT, and humic-like materials in LLH, respectively. The CDOM in LLT had a lower relative aromaticity and molecular weight, humification degree and a higher autotrophic productivity because of algal blooms. Furthermore, CDOM depletion rates in LLT were higher than those in LLH due to a longer lake residence time in LLT. In addition, CDOM shifted from high molecular weight to low molecular weight as the humification degree decreased during the CDOM depletion process. This comparative study showed that algal blooms and lake residence time were the significant factors for distinguishing characteristics of CDOM between littoral zones of shallow lakes on a similar trophic level. This study provides field-based knowledge for remote sensing CDOM measurement and serves as a reference for lakeshore aquatic environmental management. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|