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High iron and manganese groundwater samples were collected during the wet season from typical embankment areas (including Yule, Datonghu, and Gongshuangcha) in Dongting Lake Area and then analyzed by three-dimensional fluorescence spectroscopy. The fluorescence regional integration method (FRI) and the parallel factor analysis method (PARAFAC) were combined to systematically analyze the composition characteristics of DOM and its influence on the migration and enrichment of Fe and Mn. The results showed that the concentration ranges of DOC, Fe, and Mn in the groundwater during the wet season were 8.48~13.47, 1.15~14.85, and 0.07~2.17mg/L, respectively. Among them, only DOC and Mn concentrations showed a significant spatial pattern of increasing from the northwest (far away from the lake area) to the southeast (close to the lake area). The spectral index of organic matter indicated that the DOM composition of the groundwater during the wet season in the study area had strong humus characteristics and microbial source characteristics, but its proportion gradually decreased from the northwest to the southeast. The FRI and PARAFAC analysis quantitatively calculated that the proportion of fluorescence region III+V in the southeastern region near the lake area (Group C samples) was 42%, and the proportion of humus-like C1+C3components was 62%. The results of correlation analysis and principal component analysis indicated that the migration and enrichment of Fe in groundwater during the wet season was mainly influenced by humic-like components of microbial origin, while Mn might be more related to protein-like components of exogenous input.
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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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