萨拉乌苏河地区晚更新世以来的孢粉组合及其反映的古植被和古气候

本文通过对萨拉马苏河地区晚更新世以来46块地层样品的孢粉分析,共鉴定统计孢粉10390粒,其中木本植物花粉2759粒,草本及小灌木花粉7558粒,蕨类孢子73粒,分属于61个科属。根据其组合特征可划分五个孢粉组合带。反映该区自晚更新世以来植被类型曾经历了针阔混交的森林草原→荒漠草原→有松、冷杉、云杉针叶林的森林草原→荒漠草原→草原→疏林草原→草原多次演替,该区气候出现温暖湿润→于冷多风→温凉湿润→更干冷、多风→干冷→温凉偏湿→较干冷等→系列更替。

Pollen Component and Paleao-Climate and Palaeo-vegetation in Sjara-Osso-Gol River Since the Later Pleistocen Epoch

Through pollen analysis of 46 samplings collected from sediments of Sjara-Osso-Gol River since the later pleistocene epoch, totally 10390 grains of pollens have been determined, of which, tre plant pollens are 2759, herb or bush pollens are 7558, and pteridophyte pollen are 73, belong to 61 families.According to the composition features,they can be devided into 5 pollen components.It is indicated that vegetation pattern has undergone since the later pleistocene epoch several successions from conifer and broadleaf tress mixed forest steppe-desert steppe-conifer tree(Pine, fir, dragon spruce)forest steppe desert steppe-steppe-sparse forest steppe-steppe. The clmate in the district changed from warm humid-dry cold and windycool humid-more dry cold and windy-cold dry-cool and wet-little drier and colder and these climatic changes repaced one by another since the later pleistocene epocn.