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Observations were carried out at Nanliu River, Dafeng River, Qinjiang River, Maoling River and Fangcheng River in the Beibu Gulf to analyze the distribution characteristics and fluxes of nutrient in February (dry season) and August (flood season) 2018. The results showed that significantly variations of nutrient concentration were observed, and the nutrient concentrations in the Fangcheng River, Maoling River and Qinjiang River in the dry season were higher than that in the flood season, while the nutrient concentrations in the Dafeng River and Nanliu River in the flood season were higher than that in the dry season. Nitrate (${\rm {NO}}_3^- $) was the predominant species of dissolved inorganic nitrogen (DIN) during the flood season, while the ${\rm {NH}}_4^+ $ content in the Fangcheng River and Dafeng River increased during the dry season. Based on the runoff data and nutrient concentration, the fluxes of nitrogen and phosphorus into the Beibu Gulf were calculated to be 1014607 tons and 47929 tons respectively in 2018, of which DIN accounted for 77% of total nitrogen and ${\rm {PO}}_4^{3-} $ accounted for 40% of total phosphorus. During the flood river, higher nutrient fluxes were found in the Nanliu River, followed by Dafeng River, Fangcheng River, Maoling River and Qinjiang River. While in the dry season, the flux of nutrients from rivers to the coastal gulf changed significantly due to the influence of regional pollution. Compared with the historical data, the fluxes of nutrient into the coastal gulf increased significantly, which may be responsible for the increase of water eutrophication in the coastal Beibu Gulf. High and different terrestrial inputs transported by the rivers in northern Beibu Gulf may lead to an extensive impact on the ecological system of the Beibu Gulf.
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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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