【摘要】 根据该地层剖面不同时期泥炭地层的孢粉类型、数量的变化,将该不同年龄段剖面中出现的孢粉划分为四个孢粉组合带。利用不同时段孢粉类型及数量变化所反映的森林生态环境,重塑了不同时期的古气候特征。可概括为:从距今2 2万年晚更新世晚期,经冰后期晚更新世与早全新世分界,再经中全新世至晚全新世直至目前,经历了温暖、温凉—寒冷—热湿—寒冷、冷温—温度逐渐升高至目前的温暖湿润气候。与现在该地森林处于山地常绿阔叶林与暗针叶林过渡地段,属暖温带气候相一致。这一地史时期的温度变化大体呈现W型的变化趋势。该地距今6000年以来的古气候变化与《冕宁"古森林"的研究》[4]中的古气候变化趋势一致,亦得到印证。更多还原

【Abstract】 According to sporepollens types and their numerical variations in peat strata of different periods in Huo lie Lake,which is located in the Xiqi River of Butuo county in Sichuan,sporepollens appeared in soil have been divided into four combinative belts in different age stages.Ancient climate characteristics in different periods have been reconstructed by means of forest ecology environment reflected by these changes.It can be generalized that climate varied from warm and warmcool,cold,hothumid,cold or coldwarm,to the present warm humid climate,from the late Pleistocene 22 thousand years ago,between the late Pleistocene of icelater and the early Holocene,the middle and late Pleistocene,until the present.This result is in correspondence to present forest types.Temperature variations in this geological period showed W type trend.Ancient climate changes since six thousand yers ago in this site are also in accordance with that in a published study on ancient forests in Mianning county,Sichuan province.更多还原