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Speciation and distribution of phosphorus have a direct effect on the primary production and marine biogeochemistry. However, the complex current dynamics in aquatic critical zones such as large river delta and coastal area result in variable characteristics of the phosphorus speciation and distribution that need in depth study. The content, distribution and influence factors of total particulate phosphorus (TPP), particulate inorganic phosphorus (PIP) and particulate organic phosphorus (POP) in the suspended particulate matter (SPM) in the Zhejiang coastal area off Changjiang Estuary were discussed based on the investigation from April to May (spring), July (summer) and September to October (autumn) in 2016. The results showed that the content ranged from 0.13 μmol/L to 66.13 μmol/L, with an average of 3.35 μmol/L for TPP, from 0.03 μmol/L to 34.19 μmol/L with an average of 1.97 μmol/L for PIP, and ranged from 0.06 μmol/L to 31.94 μmol/L with an average of 1.39 μmol/L for POP. PIP was the dominant (52.3%) form of particulate phosphorus in the Zhejiang coastal areas. The percentage of TPP in total phosphorus ranged from 19.3% to 97.7% in spring for surface samples. The spatial distribution patterns of TPP, PIP and POP contents were similar in spring and autumn, decreasing from the inner bay to offshore areas. The content of TPP was higher in areas where the SPM was higher while PIP and POP showed a positive correlation with SPM, indicating an influence from terrestrial input. The regression coefficient and slope between POP and chlorophyll a were significantly higher than that of PIP in the area with salinity above 28 and SPM below 20 mg/L in spring, indicating contributions from phytoplankton to POP accumulation.
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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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