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In Momoge Nature Reserve, three distinct water bodies were selected for the investigation of the composition, spectral characteristics, and sources of dissolved organic matter (DOM) utilizing three-dimensional excitation emission matrix spectroscopy in conjunction with parallel factor analysis (PARAFAC). Additionally, two-dimensional correlation spectroscopy combined with structural equation modeling was employed to analyze the variations of DOM components and their relationships with water quality parameters. The results indicated that the DOM in the water bodies originated from both endogenous and exogenous sources, which has obvious humification characteristics. Five components were identified as microbial metabolites (C1), fulvic acid-like (C2 and C4), humic acid-like (C3) and tryptophan-like (C5) through three-dimensional fluorescence coupled with PARAFAC. Of five components, C1content was the highest (41.37%). The changing sequence of DOM components along the direction of water flow was characterized by 2D-COS as follows: C4→C2→C3→C1→C5, with humic-like substances showing greater variation than tryptophan-like substances, and the content of tryptophan-like substances being relatively stable. The humification degree of DOM directly affected the water quality status with influence weight of 46.17%. The water quality was indirectly impacted by DOM components C2 and C3 with a 17.59% influence weight. Insight into the response mechanism of DOM properties to water quality in Momoge Nature Reserve could provide a theoretical basis for the ecological protection of nature reserves.
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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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