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Objective Trace elements in modern and ancient dunes from the southern Mu Us Desert record environmental information related to weathering， transportation， and deposition. Analysis of this information facilitates a better understanding of sediment provenance and climatic evolution in the region. Methods Samples of modern and ancient dunes in the southern Mu Us Desert were collected， and the content characteristics and correlations of 14 trace elements including phosphorus （P）， lead （Pb）， and rubidium （Rb） were analyzed to explore the differences in trace element contents and spatial distribution characteristics among different types of dunes. Results （1） The trace elements in modern and ancient dunes are mainly barium （Ba）， strontium （Sr）， and phosphorus （P）， whereas the contents of arsenic （As）， niobium （Nb）， and copper （Cu） are relatively low. Their distribution patterns show certain regional characteristics. （2） The trace element contents in fixed dunes are significantly higher than those in mobile dunes owing to the nature of the dunes and vegetation coverage； however， the trace element contents in ancient dunes are higher than those in modern dunes， owing to the influence of sedimentary history， climate change， and special geomorphic positions. （3） The values of Sr/Cu， Rb/Sr， and Sr/Ba in modern and ancient dunes are comparable， indicating that they were formed in similar sedimentary environments. Conclusion There are certain similarities and differences in the trace element contents of modern and ancient dunes and different types of dunes. The changes in trace element contents in ancient dunes can provide clues to the sources of modern dunes to a certain extent. The ratios of trace elements in modern and ancient dunes have certain implications for climate and environmental conditions.
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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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