【摘要】 湖泊沉积通量蕴含了流域降水量及人类活动的丰富信息．依据太白湖沉积岩芯²¹⁰Pb测定结果及CRS模式,建立了近百年来的沉积年代序列,对比分析了不同时期沉积通量变化与流域降水量及人类活动的关系．1900-1920、1928、1937-1942、1953-1954年沉积通量较高的四个时段,分别对应于夏季降水较多的1900-1920、1931、1938-1939、1954年,沉积通量增加主要与夏季降水量偏多,被带入湖泊的泥沙量增加有关．1958-1963年,太白湖流域上游兴建三座水库,对洪水及入湖泥沙起到了调蓄作用,自此之后,太白湖的平均沉积通量减小,降水量已不再是影响沉积通量的主导因素;1958-1970年沉积通量较高,主要是太白湖围垦导致的人湖泥沙量的增加及湖泊面积减小所致;1983-1993年沉积通量的增加则反映了农业生产方式由集体转为个体生产模式后,耕作业的快速发展所导致的水土流失的加重．研究结果证明,采用²¹⁰Pb强度及CRS模式所建立的太白湖近百年来的沉积年代标尺精度较高（误差小于4年）,太白湖沉积环境稳定,可采用其沉积指标进行流域及湖泊环境演化重建．更多还原

【Abstract】 Time-depth correlation of the sediment core from Lake Taibai,Hubei Province was established based on the ²¹⁰Pb intensity and CRS model.The sedimentary flux variation and its correlations with the summer precipitation and human activities during the last century in Lake Taibai catchment were discussed.There were six periods with high sedimentary flux.The former four periods,1900-1920,1928,1937-1942 and 1953-1954 AD,were cor- respondent with the four phases with a higher precipitation in summer,which were 1900-1920,1931,1938- 1939 and 1954 AD.The high sedimentary flux was resulted from more material input by stronger runoff.After three reservoirs were built in the upstream region of Lake Taibai inflow rivers in 1958-1963 AD,there was a lower aver- age sedimentary flux for Lake Taibai due to the regulation of the reservoirs to the flood and silts,and the controlling function of precipitation on sedimentary flux became weakened.The high sedimentary flux during 1958-1970 AD was mainly related to the land reclamation around the Lake,resulting lake area decreased.The high sedimentary flux during 1983-1993 AD was induced by the soil erosion with the rapid development of cultivation after the change of agricultural production patterns.By the contrastive analysis of sedimentary flux with precipitation and hu- man activities,the accuracy of the timescale of Lake Taibai sediment can be reliable,which also indicated the e- nough stable sedimentary environment.Thus,the sedimentary proxies can be used to reconstruct the environment evolution process in Lake Taibai catchment.更多还原