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A total of 78 water samples from mesotrophic and eutrophic urban lakes in Nanjing, Jiangsu Province, China were systematically analysed using three-dimensional excitation-emission matrix（EEM）fluorescence spectroscopy coupled with parallel factor analysis（PARAFAC）to characterize dissolved organic matter（DOM）composition and sources as well as their links with water physiochemistry parameters. This study was designed to unravel the effects of eutrophication on the fluorescence characteristics of DOM and its influence pathway. Three distinct fluorescent components were identified: anthropogenic-derived humic-like substances（C1）, terrestrial humic-like substances（C2）, and microbial-produced protein-like substances（C3）. Eutrophic urban lakes exhibited significantly higher fluorescence intensities in both C2 and C3 relative to mesotrophic urban lakes. Fluorescence indices confirmed dual DOM sources-terrestrial inputs and autochthonous production. Meanwhile, although the humification index of DOM in mesotrophic urban lakes exceeded that in eutrophic urban lakes, the humification index of DOM was below 1.0 for all samples. Moreover, the biological index of DOM exhibited an increasing trend with the elevation of trophic status of water column. Additionally, significantly elevated Chla concentration were observed in eutrophic lakes compared to mesotrophic lakes. Strong positive correlations were identified between Chla concentration and the fluorescence intensity of C2 and C3 components alongside the biological index of DOM, suggesting that eutrophication may induced autochthonous DOM by stimulating algae reproduction.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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