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The formation of vertical sedimentary rhythmic layers of tidal flat mainly depends on periodic tidal conditions, including flood and ebb tide, spring and neap tide, seasonal and longer term scale tidal characteristics. In order to investigate the distribution and mechanism of sediment bedding on tidal flats, a one-dimensional numerical model was used to simulate the rhythmic layers of long-term tidal flat bedding layers under spring and neap tidal cycles. Results indicate that the periodicity of spring-neap tide is the main reason for the rhythmicity of sedimentary bedding. One couplet in the rhythm layer corresponds to the spring-neap tidal period, which is formed by the mud-dominated layer during the neap tide and the sand-dominated layer during the spring tide. The thicknesses of layers also show a cyclical change: bedding layers are thicker during the spring tide and thinner during the neap tide. The boundary sediment concentration is also an important factor affecting the structure of tidal couplets. An increasing boundary concentration of silt makes the tidal rhythm layer coarser and increases the overall thickness of the sand-dominated layer. When the boundary sediment concentration significantly increases, the vertical tidal rhythm layers on the tidal flat are more intact with an evident increase in layer thickness. The formation and characteristics of tidal bedding layers are the result of the joint action of many factors (e.g., waves, storms, biological factors and etc.), which await further research effort in the future.
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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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