安固里淖湖积物中总有机碳含量及其碳同位素的环境意义

Environmental Significance from Organic Carbon and Its Isotope of Angulinao Lake Sediment

在探讨有机碳含量及其稳定碳同位素的环境指示意义基础上，对张北高原安固里淖湖泊沉积物进行了分析，重建了安固里淖近400年来的气候环境演变格局。安固里淖沉积物中总有机碳含量的变化间接反映了区域气温的变化，有机碳同位素值的变化与湖泊水位波动导致的湖泊水生植物种类的改变有关。在钻孔岩芯定年的基础上，认为安固里淖地区从约1630AD开始气候逐渐变冷，到1840—1890AD为温度最低点，随后气候变暖；相对于温度的变化过程，从约1630AD开始，气候逐渐向湿润方向发展，到约1770—1840AD期间气候最为湿润，之后气候逐渐变干。

The change of the total organic carbon and its isotope was analyzed in order to reconstruct the environmental change in the last 400 yr in Angulinao Lake sediment. The change of the total organic carbon content in Angulinao Lake sediment reflects the regional temperature fluctuation; the value change of organic carbon isotope was relevant to the change of the lake water plants composition caused by the water level fluctuation. With the establishment of sediment chronology and analysis of total organic carbon and its isotope, the temperature of Angulinao area began to drop from 1630 AD and rose after 1840 - 1890 AD. Corresponding to temperature change, the moisture increased gradually from 1630 AD and decreased from 1770 - 1840 AD.