PALEOVEGETATIONAL AND PALEOCLIMATIC EVOLUTION SERIES ON NORTHEASTERN QINGHAI-XIZANG PLATEAU IN THE LAST, 30 KA

Palynological study of 2 lacustrine suites by limnological and C-14 da ting reveals the local evolutionary history of the paleovegetation and the paleoclimate of Zoige Plateau, northeastern Qinehai-Xizang Platea u, since the last 30 ka. The territorial paleovegetation evolution exp erienced 7 stages: alpine desert vegetation, grassland, marsh and sub- alpine meadow, islet forest, marsh and meadow, Picea and Abies forest, marsh and sub-alpine meadow, islet dark conifer, marsh and sub-alpine meadow, and the inferred paleoclimate evolution shared similar variat ions correspondingly. The major climatic Events during the periods of post-glacial and the Holocene left their distinct marks in sediment re cord.