Sporopollen Combination in Southern Qiangtang Basin and Environment Significance
Zhao Miao;Zhang Wenqing;Cai Wutian;Li Yingzhi;Geng Tingting;Zhang Tao;Zhang Zhiyin;Zhang Xuemin;China Geological Survey of Hydrological Geology Environmental Geological Survey Center;Nine One Five Hydrogeologic & Engineering Geology Briage of Sichuan Bureau of Geology & Mineral Resources;
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.