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Paleoclimate and paleoenvironment reconstruction based on shelf mud deposits remain controversial due to the complexity of coastal dynamic conditions. In this paper, three sediment cores distributed along the sediment transport path in the North Yellow Sea were collected, and the sediment grain size composition, end member, winter storms and Yellow Sea Warm Current strength variation were also analyzed. Based on above analysis, the response mechanism and intensity of different sediment grain size end member to winter storms and Yellow Sea Warm Current were discussed, and sedimentary effect in different regions caused by the above changes was also revealed. The results show that sediment composition in the north branch of Huanghe River distal mud is dominated by the natural condition and human activity over the past 100 years, respectively. Due to the impact of human activities on the sediment flux and composition of the Huanghe River into the sea began to enhance since 1980, and the natural evolution information was destroyed. In addition, through comparing sediment end member of different cores along the sediment transport pathway, the discrepancy in response mechanism and intensity of different end member to winter storms and the Yellow Sea Warm Current were observed before 1980, which reflected significant regional sedimentation effect. Further analysis demonstrated that, the coarse-grained end member is dominated by the winter storm, reflecting intensity of cross-front transport from the north Shandong Peninsula; and the fine-grained end member is controlled by the Yellow Sea Warm Current, representing the long distance transport from the offshore mud patch of the western North Yellow Sea to the eastern coast of the Liaodong Peninsula. Above conclusions indicated that, the sediment grain size is a robust tool for paleoclimate and paleoenvironment reconstruction; however, the utility of sensitive grain size should be based on sediment source and the characteristics of the sediment hydrodynamic environment analysis, and selection of the sensitive grain size and its implication should be careful.
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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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