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The radial sand ridges is a typical sedimentary accumulation body distributed off the coast of Jiangsu Province. Under the influence of the sediment supply of the Changjiang River and the Huanghe River as well as the coastal tidal current, the typical silty-muddy tidal flats are developed, and the sediment elements can record the important information of the environmental changes of the tidal flats. Three short core samples were collected in the tidal flat of radial sand ridges to establish a reliable chronological framework and geochemical element testing, and 14 elements with high X-ray fluorescence (XRF) core scanner analysis signal strength were selected for clustering and correlation method to extract environmental information. The sedimentary environment changes of the northern Jiangsu radial sand ridges under the influence of human activities and coastal environment changes in the past 100 years were studied. The results indicate that the contents of Si, Ca and Fe in the core sediments of typical tidal flat profile in this area are relatively high, and the contents of Si, Ca and Fe increasing from north to south, while the contents of Mn, Ba, Cu and Zn are low, and the little changes in contents at all profiles changes. In terms of vertical change, Si, Ca and Fe have the same vertical change trend, while Ni, Zn and S have the opposite change trend with Si, Ca and Fe in different sediment cores. Correlation and clustering analysis show that Si, Ca and Fe have high correlation, that is, they have similar geochemical behavior and consistent material source. In addition, it is negatively correlated with elements Ni, Cu and Zn, suggesting that these elements have different geochemical behaviors with the former. The sedimentary environment changes of the tidal flat are obvious and show different patterns in different regions in the northern Jiangsu radial sand ridges, and the material source, hydrodynamic environment and human activities are the main reasons leading to the change of the sedimentary environment.
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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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