可可西里地区钻孔记录的中更新世孢粉与环境演化

hrough paleomagnetic dating and contrast with marine sediment record ODP677, we reconstruct the time series of core BDQ0608 in Hoh Xil area. By using BDQ0608 core pollen records to reconstruct vegetation and climate evolution of the Hoh Xil region history: 700Ka B P-730Ka B P,（the same as before, also need pollen records） towards a cold wet climate conditions. 455 Ka B P -700 Ka B P, xeric herbaceous Chenopodiaceae and Artemisia Branch, Ephedra is still a high value, Pollen vegetation and climate index are indicative of climate change tend to warm and dry; 375 Ka B P-455Ka B P, combination of Chenopodiaceae and Artemisia pollen decreased Division, Pinus and Picea increased significantly, forests are developed, semi-desert grassland slightly degraded; 265Ka B P-375 Ka B P, pollen mix dry herb Chenopodiaceae and Artemisia subjects to the extreme, forest degradation, drought; 210Ka B P-265Ka B P, coniferous forest of Pinus and Picea reached the profile of the extreme, even the wet climate; 160Ka B P-210Ka B P, semi-desert grassland degradation, expansion of coniferous forests, climate is damp and cool;25Ka B P-160Ka B P, pollen assemblage mainly dry herb Chenopodiaceae and Artemisia family is the main warm and dry climate.