湖泊沉积记录的近500年来浑善达克沙地气候环境变化  

Study on Climatic and Environmental Changes of the Past 500 Years From Lacustrine Sediment in Otindag Sandy Land

作　　者：武健伟[1] 鲁瑞洁[2] 赵廷宁[3] 

机构地区：[1]国家林业局调查规划设计院,100714 [2]北京师范大学中国沙漠研究中心,100875 [3]北京林业大学水土保持学院,北京100083

出　　处：《中国水土保持科学》2004年第4期42-47,共6页Science of Soil and Water Conservation

基　　金：国家自然科学基金项目 (4 0 2 71114 )

摘　　要：为摸清浑善达克沙地近 5 0 0年来气候环境变化规律 ,以沙地内湖泊沉积为研究对象 ,根据浑善达克沙地内白银库伦诺尔湖泊沉积物粒度、地球化学元素、有机质和CaCO3 等环境变化代用指标的分析结果 ,结合2 10 Pb和13 7Cs测年资料 ,恢复了包括小冰期和 2 0世纪初升温期等气候事件在内的浑善达克沙地近 5 0 0年来气候环境变化规律。A .D .15 0 0～ 16 0 0 ,浑善达克沙地气候较干旱寒冷 ,植被生长受到抑制 ;A .D .16 0 0～ 176 0 ,气温升高 ,降水增加 ,湖泊水位上升 ,为温和湿润—温和偏干气候 ,植被盖度增加 ;A .D .176 0～ 190 0 ,气候较温和湿润 ,后期气候干旱寒冷 ;A .D .190 0 ,小冰期结束 ,气温回升 ,降水增加 ,但近现代以来 。Based on analysis of grain size, geochemical elements, organic matter and CaCO 3 records in lacustrine sediment in Baiyin-kulun lake, combined with 210Pb and 137Cs, the sequence of climatic and environmental change of Otindag Sandy Land was reconstructed in the past 500 years, including two important climate events, i. e. the Little Ice Age and the Global Warming at the beginning of 20th century. The results showed that from A.D.1500 to A.D.1600, the climate was arid and cold, the development of vegetation was restrained. From A.D.1600 to A.D.1760, the climate was warm and wet or warm and arid, the water level of lake was rising and the coverage rate of vegetation increased. From A.D.1760 to A.D.1900, the climate was relatively warm and wet at the first stage, and the climate was cold and arid at the last stage. The Little Ice Age was over at about A.D.1900, temperature and precipitation increased. However, the climate was gradually warm and drought in late and modern day.

关 键 词：气候环境变化 湖泊沉积 小冰期 地气 浑善达克沙地 降水 代用指标 气温升高 干旱 植被盖度 

分 类 号：S152[农业科学—土壤学] P597[农业科学—农业基础科学]