Acta Geographica Sinica ›› 1997, Vol. 64 ›› Issue (5): 430-438.doi: 10.11821/xb199705006

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Wang Fengyu, Song Changqing, Sun Xiangjun   

  1. 1. The Research Institute of Forest Resources Information and Technique, CAF. Beijing 100091;
    2. Institute of Botany, Academia Sinica, Xiangshan, Beijing 100093
  • Online:1997-09-15 Published:1997-09-15

Abstract: The Chasuqi profile (40°40′N, 111°08′E) is located in front of Daqingshan Mts., which is 55km westward from HOHHOT, capital of Inner Mongolia province. The landform at the front edge of pluvial fan is gentle with a grassland vegetation. The profile is 280cm deep with peat deposits at the upper part and clay or salt clay at the lower part. The 9100 aBP of bottom age and 0 aBP of the top are infered by linear interpolation based on 4 14 C control data. 50 types, 19 tree families and genera, 22 shrubs and herbs, 5 quatics and 4 ferns spores were found by analysis of 133 samples. The plentiful pollen appear and the highest total influx is up to 2765 grains/(cm 2·a). The tree pollen percentage, the highest up to 97 2%, is more than shrubs and herbs within the 58cm ̄190cm depth. The highest influx of that reaches to 615 grains/(cm 2·a). On the other hand, the pollen percentage of shrubs and herbs is more than that of trees within the depths of 9 cm ̄58 cm and 166 cm ̄254 cm, in which the highest is up to 100%, and they are mainly consisted of Artemisia , Chenopodiaceae and Ephedra . Five pollen assemblage zones were established according to stratigraphically constrained cluster analysis. The vegetation change were infered as following: (1) from 9 100 aBP ̄7 400 aBP, the steppe vegetaton dominated was inferred according to low influx and rare types; (2) from 7 400 aBP ̄5 000 aBP, the tree steppe vegetation formed due to the evidence of increasing total influx, especially trees; (3) from 5 000 aBP ̄4 100 aBP, the total influx reached to the highest and the percentage of tree pollen diminated obviously which reflects a forest vegetation; (4) from 4 100 aBP ̄1 350 aBP, the composition of pollen types changing greatly, the vegetation underwent forest tree steppe steppe; (5) from 1 350 aBP ̄0 aBP, the typical steppe vegetation was reflected by pollen asseblage mainly consisting of herb types. In conclusion, there are some similarities in vegetation changes in the profile comparing to the results from another area but the time series.

Key words: Holocene, pollen analysis, peleovegetation change, inner mongolia

CLC Number: 

  • P534.632