【摘要】 黄河下游地区湖泊演化多与黄河河道变迁密切相关，进行高分辨率的湖泊沉积环境的研究，可揭示历史时期黄河下游的河道变迁本文以南四湖ＤＳ孔为例，探讨河道变迁的湖泊沉积物响应．２４００ａＢＰ左右南四湖地区环境演变出现明显的变化，湖泊沉积物色素、ＴＯＣ、ＴＮ和磁化率一频率磁化率曲线显示２４００ａＢＰ以来湖泊开始出现，黄河泛滥开始影响该区域．ＢＣ４００－ＡＤ１７０和ＡＤ１２００－ＡＤ１８７０期间是黄河影响ＤＳ孔湖泊沉积的主要时期．２４００ａＢＰ以前南四湖地区的独山湖一带湖泊尚未形成，推测当时为泗河、城河冲积扇前缘的洼地．特别是１３世纪以来人类活动与黄河泛滥加速了现代南四湖形成．更多还原

【Abstract】 The historical changes of river channel （river floods） in the lower reaches of the Yellow River has been hotly debated by the historians in China. In Nansihu Lake area, the sedimental environment has undergone great change, since the evolutionary history of the lake was strongly affected by floods of Yellow River in historical times. High-resolution lacustrine sediments, reflecting the history of lake evolution, could be used to decipher foe changes of river channel （river floods） In the Lower Reaches of the Yellow River. Two sedimentary cores （DS₁ and DZ₂ ） are taken by Liv- ingstone in Dushan Lake, one of the sub-lakes of Nansihu Lake, 1996. The analysis of environmental indexes including pigments, TOC, TN and magnetic susceptibility, frequency dependent susceptibility, of lake sediments in tile cores of DS is synthesized to indicate the environment changes in Nansihu Lake in the past 3000 years. About 2400aBP a clear environmental change occurred in the catchment of Nansihu Lake. From BC400’s to AD170’s and AD1200, s - 1870’s are two main floods periods on the lower reaches of the Yellow River. Before 2400aBP the lake was not formed in the area which may be a depression in the edge of fluvial fan of the Sihe River and the Chenghe River. After 2400aBP the lake came into being and was enlarged due to the alluvial fan emerging from the overflow of the Yellow River, especially in BC400 - AD170 and AD1200 - 1870. The link-up of the Grand Canal and the requisition for canal transportation from the 13th century to AD1870 accelerated the lake expansion. From 1872, Nanyang Lake, Dushan Lake, Shaoyang Lake and Weishan Lake were united into one large lake - Nansihu Lake.更多还原