| 银川盆地中更新世以来的孢粉组合与古环境变化 |
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| 关键词:pollen assemblage paleoenvironment Mid-Pleistocene Yinchuan basin |
| 基金项目:原地质矿产部部控项目“银川平原农业生产基地地下水资源和环境地质综合勘探评价” |
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| 摘要: |
| Pollen Assemblages and Paleoenvironment Changes in Yinchuan Basin since Mid-Pleistocene |
| This paper has carried out a systematic analysis of pollen in sediments from the key Borehole CK1 at the depth of 300.39m in northern Yinchuan Basin, and studied vegetation succession and climatic changes of this basin since Mid Pleistocene. The regional features of pollen assemblages clearly show that Yinchuan basin has experienced 11 developing stages in paleovegetation succession since 0.90Ma B.P., i.e., coniferous-broad-leaf mixed forest and brush grassland→coniferous broad leaf mixed forest and shrub grassland→sparse woods and shrub grassland→coniferous broad leaf mixed forest and grassland→ sparse woods and shrub grassland→coniferous forest and grassland→coniferous forest mainly composed of dark coniferous trees and grassland→shrub grassland→coniferous broad leaf mixed forest and brush grassland→sparse woods and grassland→desert grassland. The paleoenvironment corresponding to the succession of paleovegetation has undergone humid temperate→humid cool→temperate→humid cold→temperate arid→comparatively humid cool→humid cold→temperate arid→cool moist→comparatively temperate arid →temperate arid climate. These results provide valuable information for detailed research of climatic changes and environmental evolution in this area. |
| YANG Zhen-jing,TONG Guo-bang,LIU Zhi-ming,XU Jian-ming,YANG Xiao-lan.2001.Pollen Assemblages and Paleoenvironment Changes in Yinchuan Basin since Mid-Pleistocene[J].Acta Geoscientica Sinica,22(4):369-374. |
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