CHARACTERISTICS OF POLLEN ASSEMBLAGES IN SURFACE SOILS IN THE MAQU-HONGYUAN AREA, ZOIGÊ PLATEAU, NORTHERN SICHUAN
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摘要: 通过对四川若尔盖高原玛曲-红原一带20个表土孢粉样的分析, 研究了该区域表土孢粉组合与现代植被的关系。结果显示, 玛曲-红原一带表土的孢粉组合基本反映了现代植被的整体特征, 与现代植被在植被类型、植被带的空间排列、主要建群种属和优势种属等方面基本一致。依据孢粉的百分含量, 可以划分为亚高山灌丛植被区, 亚高山灌丛、亚高山草甸植被区和高寒草甸、草原植被区3个植被带。表土花粉的代表性因种属的不同而各有差异, 松属和菊科花粉具超代表性, 云杉属花粉的代表性较好, 禾本科和莎草科具低代表性, 而桦木属则不具有超代表性, 可能与桦木属花粉不易搬运有关。3个植被区中的表土孢粉的种类、比例与现代植被均存在一定的差别, 这可能与植被退化有关。Abstract: In order to investigate the relationship between the surface pollen and modern vegetation, 20 surface soil samples collected from the Maqu-Hongyuan area on the Zoigê Plateau, Sichuan, were analyzed and the relationship between the surface pollen assemblages and modern vegetation in the study area were studied.The results show that the surface pollen assemblages in the area approximately reflect the whole features of the modern vegetation and are basically similar to the features of the modern vegetation in respect to vegetation types, spatial arrangement of vegetation zones and main assemblageestablished and dominant genera and species.Three vegetation zones may be distinguished by pollen percentages; they are the subalpine shrub, subalpine shrub and subalpine meadow, and alpine meadow and steppe vegetation zones.The representation of surface pollen varies with genera and species.Pinus and Compositae pollen are overrepresented and Picea pollen is moderately represented, while Gramineae and Cyperaceae pollen are underrepresented.Betula pollen is not overrepresented, which is possibly due to difficulty in transport.The genera and percentages of the surface pollen in the three vegetation zones show certain difference from those of the modern vegetation, which may be related to vegetation degeneration.
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Key words:
- Zoigê Plateau /
- surface pollen assemblage /
- pollen analysis /
- vegetation /
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图 1 若尔盖高原玛曲—红原一带表土孢粉采样点位置
Figure 1. Sites of surface pollen samples from the Maqu-Hongyuan area, Zoigê Plateau
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