| 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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| 引用本文：杨振京,童国榜,刘志明,徐建明,阳小兰.2001.银川盆地中更新世以来的孢粉组合与古环境变化[J].地球学报,22(4):369-374. |
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| 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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| 中文摘要:通过对银川盆地北部重点井CK1孔（深300．39m)沉积物进行的系统的孢粉分析，探讨了银川盆地中更新世以来的植被演替和气候变化，区域孢粉组合特征清楚地反映了银川盆地900ka B.P.以来古植被经历了11个发展演替阶段；针阔混交林－灌丛草原→针阔混交林－灌木草原→疏林灌木草原→针阔混交林－草原→疏林灌木草原→针叶林－草原→暗针叶林为主的针叶林－草原→灌木草原→针阔混交林－灌丛草原→荒漠草原，与古植被发展演替阶段相应的气候环境经过了温湿→凉湿→温和→冷湿→温干→凉较湿→冷湿→温干→凉润→温较干→温干的变化。 |
| 中文关键词:孢粉组合 古环境 中更新世 银川盆地 |
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| Pollen Assemblages and Paleoenvironment Changes in Yinchuan Basin since Mid-Pleistocene |
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| Abstract: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. |
| keywords:pollen assemblage paleoenvironment Mid-Pleistocene Yinchuan basin |
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