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Outline
Dissolved organic matter (DOM) in surface water, which serves as a significant component within the carbon cycle, plays a vital role in the biogeochemical cycle of aquatic ecosystems. The triplet excited state of DOM (3DOM*), singlet oxygen (1O2), along with hydroxyl radicals (·OH), which are the photochemical products generated from DOM, were taken as the research targets. Three regression algorithms were employed to constructed the machine learning (ML) models predictive models for evaluating importance of features including environmental factors, ultraviolet-visible light parameters and fluorescence parameters. The ML model based on the categorical boosting algorithm exhibited better performance for the prediction targets in the test set, with R2 values of 0.9344, 0.8091, and 0.7775, respectively. Temperature, DOC, and pH were identified as the most important features for predicting 3DOM*, 1O2 and ·OH, respectively. When applying the chained ML model incorporating with the categorical boosting algorithm, the prediction performance for 1O2 and ·OH was further optimized. For 1O2 the R2 value in the test set increased from 0.8091 to 0.8233, and the RMSE decreased from 1.322 to 0.418. For ·OH the R2 value in the test set rose from 0.7775 to 0.8094, and the RMSE dropped from 2.982 to 0.312. Additionally, the ML models perform better than the partial least squares regression model in predicting 3DOM*, 1O2 and ·OH, indicating that the ML models possessed strong capability to handle non-linear relationships. The feature importance analysis based on ML successfully distinguished the key features in the DOM photochemical reaction. This finding can provide direct evidence for the intensive management of numerous influencing factors.
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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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