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Characteristics of heavy metals in the Zhujiang River Estuary are mainly influenced by the interacting river-tide dynamics. Water and sediment samples were collected in the Zhujiang River Estuary and its adjacent zones in the summer of 2018. The present study aimed to investigate the estuarine behaviors (i.e., sedimentary, transportation, accumulation) of seven metals Hg, As, Zn, Cd, Pb, Cu, and Cr, which were co-influenced by the physicochemical properties in the estuary. The levels of heavy metals in sediments were higher than those dissolved in water. The heavy metals in sediments were more stable and the pollution was thus more serious. The results of Pearson correlation and principal component analysis showed that dissolved metals were more easily diluted and mixed, and the sediment metals were significantly influenced by the total organic carbon and redox. The metal partitioning between sediments and water was discussed as well in this study under the influence of estuarine dynamics, which indicated the phase exchange between multimedia in the estuary; Pb and Cr were more easily absorbed in the particulate particles, while Cd and Hg were intended to dissolve in water. The significant correlations between metals (e.g., Hg, Pb, and Zn) indicated the similar sources, and the principal component analysis was used to probe into the source contributions of heavy metals in sediments of the Zhujiang River Estuary, contributed mainly by industrial pollution, followed by agricultural pollution and atmospheric deposition. These findings will provide important information for the effective controls of heavy metal inputs and estuary management.
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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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