地理学报

地理学报 ›› 1997, Vol. 52 ›› Issue (5): 430-438.doi: 10.11821/xb199705006

• 论文 • 上一篇    下一篇

内蒙古土默特平原北部全新世古环境变迁

王瑜, 宋长青, 孙湘君   

  1. 1. 中国林业科学院资源信息所, 北京　100091;
    2. 中国科学院植物研究所, 北京　100093
  • 出版日期:1997-09-15 发布日期:1997-09-15
  • 基金资助:
    国家自然科学基金49291100

PALYNOLOGICAL RECORD OF PALEOVEGETATION CHANGE DURING HOLOCENE AT NORTH TUMOTE PLAIN IN INNER MONGOLIA, CHINA

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

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29 | 2

摘要： 内蒙古土默特平原北部地区全新世以来气候变迁主要经历了由凉—温—暖—温—凉的序列，可以划分为五个主要阶段：９１００ａＢＰ～７４００ａＢＰ，气候偏干偏冷；７４００ａＢＰ～５０００ａＢＰ，气候波动剧烈，属过渡期，前期气候温和偏干旱，后期温和偏湿润；５０００ａＢＰ～４１００ａＢＰ，气候温暖湿润；４１００ａＢＰ～１３５０ａＢＰ，属气候过渡期，气候逐渐趋向干旱，人类影响增大；１３５０ａＢＰ～现在，气候温和半干旱，处在人类强烈干扰之下。全新世温暖期发生在７４００ａＢＰ～４１００ａＢＰ，全新世最适宜期发生在５０００ａＢＰ～４１００ａＢＰ期间。

关键词: 全新世, 孢粉分析, 古植被变迁, 内蒙古

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

中图分类号: 

  • P534.632