西藏南羌塘盆地重要湖盆孢粉组合与环境意义

对南羌塘盆地内流湖盆区多个湖盆晚更新世—全新世地层孢粉组合进行分析,采用蒿属（Artemisia）与藜科（Chenopodiaceae）比值（A/C值）和麻黄（Ephedra）、藜科、蒿属含量变化趋势分析,恢复了该地区的植被与气候变化特征,总结了3个钻孔和区域上湖盆环境干湿度变化规律：扎仓茶卡湖盆南侧、搭拉不错湖盆南侧,呈针阔叶混交森林草原植被,气候总体温暖湿润;别若则错湖盆西侧,呈针阔叶混交疏林植被,气候总体较寒冷干燥。区域上由西向东干燥程度逐渐加强,佐证了通过孢粉组合分析得出的气候变化特征。此次成果对南羌塘盆地湖盆区气候演变趋势具有重要的研究意义。

Sporopollen Combination in Southern Qiangtang Basin and Environment Significance

Based on the sporopollen analysis of the Late Pleistocene-Holocene lacustrine strata in multiple lake basin of the southern Qiangtang region, using A/C value and ephedra, chenopodiaceae, Artemisia’s amount change trend, this article presents the vegetation and climate change of the aera and summarized the variation of dry humidity in three boreholes and basins: the south of Zha Cang Cha Ka basin and Da La bu Cuo Basin were Needle broadleaf mixed forest grassland vegetation and the climate was warm and moist. The west of bie ruo ze cuo basin was Needle broadleaf mixed forest vegetation and the climate was cold and dry. The dry degreeis gradually increased from west to east and provide demonstration for climate change. The results obtained from this article have an important significance for the study of the climate change trend in southern Qiangtang Basin.