关键词: 江陵, 湖泊沉积物, 粒度特征, 气候意义

Abstract: As a main geology body recording a large amount of information on paleoclimate environment changes, lake sediments continuously and sensitively record information of regional climate and environment with annual to decadal resolution. The sediments were sampled from Jiangling section, located in Jiangling County, Jianghan Plain. Based on the high-resolution sampling and the analysis result of sedimental lithology,grain size, pollen and the isotope of organic carbon the grain-size characteristics of Jiangling lake sediments have been analyzed and the paleo-climatic changes over last 9 000 years in the area have been reconstructed. The research result shows that the lake sediment in Jiangling lake has well recorded the dryingup process of water body and climatic changes can be divided into five stages as follows: 8 900~6 300 aB.P. when the lake was deep and open with wet climate; 6 300~4 700 aB.P. when the lake was shallow with arid climate; 4 700~3 400 aB.P. when the lake was much shallower with the a little wetter and hotter climate; 3 400~2 500 aB.P. when the limnic peat was widely developed with hot and wet climate; 2 500 aB.P. to current when the lake was changed towards the flood deposition with arid cliamte.The climatic changes over 9 000 aB.P. in Jiangling area were coincident with other research results in neighboring areas,especially the Dongting lake. The sediment gain size provides a new effective way to recover the climate changes.

Key words: Jiangling, lake sediments, grain-size characteristics, climatical significance