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In order to explore the spatiotemporal characteristics of water quality and its correlation with land use type in the middle and lower reaches of the Chanba River, sampling and monitoring were conducted in April (wet period), August (flow period) and December (dry period) of 2019 based on seventeen sampling sites. The spatial-temporal characteristics of water quality and the identification of main pollution factors were analyzed by employing multivariate statistical, and the relationship between the land use type and water quality indexes was studied by the method of Spearman analysis. The results show that water quality had spatial and temporal characteristics in the middle and lower reaches of Chanba River in 2019. In terms of time, the concentration values of NH3-N, TP and CODMn were maximum in flow period; The order of TP and CODMn was sorted as flow period > wet period > dry period. Spatially, the concentrations of NH3-N, TP and CODMn basically increased from the middle reaches to the lower reaches. Influenced by human activities along the river, the water quality was mainly polluted by nutrient and organic matter in the middle and lower reaches of Chanba river. Construction land had a positive correlation with pollutants and played a "source" role, while forest had a negative correlation with pollutants and played a "sink" role. The results can provide reference for water environmental management in Chanba River Basin.
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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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