【摘要】 系统简单、受人类活动干扰较小的湖泊沉积物真实地记录了湖区气候环境变化方面的大量信息,特别是沉积速率较快的湖泊,其沉积物是记录高分辨率气候环境变化的良好载体。通过对湖泊沉积物粒度以及元素地球化学特征的分析,探讨了毛乌素沙漠北部泊江海子地区近130 a来的气候环境变化。结果表明:1932年前,气候总体上较为寒冷干旱(1876—1888年湖泊水位较低,气候温暖干旱,温度有下降的趋势;1888—1908年气候较上一阶段湿润,而温度有所降低;1908—1932年气候干旱并且波动频繁,又以1917年前后以及1924—1932年干旱程度最为严重,可能有强沙尘暴发生);1932—1962年,气候温暖湿润但有变冷的趋势;1962—1976年气候频繁波动;1976年以来气候温暖湿润但有变干的趋势,尤其是1990年以后气候波动幅度增大并且出现了暖干化趋势。更多还原

【Abstract】 Lake sediments honestly recorded much information about climatic environmental changes of drainage area.Especially the lake sediments with bigger deposit velocity are well proxies for high-resolution environmental changes researches.Based on the analyses of granularity and elements characteristics,this paper discussed climatic environmental changes of the Bojianghaizi Lake(located at northern Mu Us Desert) since 1876.It is indicated reliably by the results that this area had undergone several cold-warm and dry-humid changes during the past 130 years: before 1932,climate was dry and cold(1876-1888,climate was warm and dry with low water level,and the temperature had descending trends;1888-1908,climate was humid and colder than the previous period;1908-1932,climate was dry and unstable,and serious drought at 1917 and 1924-1932);1932-1962,climate was warm and humid with cold trends;1962-1976,climate was unstable and fluctuated frequently with large scope;after 1976,climate was warm and humid with dry trends,especially since 1990 climate fluctuated with larger scope and presented warm-dry trends.更多还原