IMPLICATION OF MAGNETIC FREQUENCY DEPENDENT SUSCEPTIBILITY ON ENVIRONMENTAL VARIATION FROM LACUSTRINE SEDIMENT IN DAIHAI LAKE
岱海湖泊沉积物频率磁化率对历史时期环境变化的反映

On the basis of discissing the environmental significance of magnetic susceptibility of lake sediment, the historical environmental variations have been studied from Daihai DH 32 Core with the analysis of granulomtry, sporo pollen, historical data and diatom determination. It is believed that during the historical periods the higher value of magnetic frequency dependent susceptibility in lake sediments coincided with the wet climate, and the lower value related with the dry climate. The climate change in the past 300 years implicated by magnetic frequency dependent susceptibility from DH32 Core can be divided into seven periods which mostly coresponded with the analysis of granulomtry, sporo pollen, historical data and diatom determination. The magnetic frequency dependent susceptibility of lacustrine sediment is one of the main environmental indexes for reconstructing historical environmental variations.