沉积学报2017，Vol.35Issue(6)：1158-1165,8.DOI:10.14027/j.cnki.cjxb.2017.06.007
新疆乌伦古湖沉积物粒度特征揭示的环境信息
Environmental Information Inferred from Environmentally Sensitive Grain-size Component Records in Wulungu Lake, Xinjiang
摘要
Abstract
Analysis of a sediment core from Wulungu Lake of Xinjiang was carried out by using environmental proxy of grain-size. Combining with 210Pb and 137Cs dating, the characteristics and environmental significance of sensitive grain-size components of Wulungu Lake sediments were studied in Wulungu Lake region. The results showed that the sediment core mainly consisted of clay and fine-silty, however, grain-size displayed a sudden shift before and after 1970 AD:the coarse particle fraction (>16μm) was significantly increased. The grain size characteristics of the sedi-ments also changed significantly during 1830-1842 AD and in about 1910 AD. The analysis of grain-size frequency distribution curves of the sediment core indicated that the transportation medium or transporting force had changed sig-nificantly during corresponding periods. Based on this result, environmentally sensitive grain-size component C2 ( 7-25μm) was extracted by the variations of the grain-size standard deviation. Based on correlation analysis between sensi-tive grain-size component and meteorological data, the environmental significance of sensitive grain-size component C2 was explicated. The results indicated that the content of sensitive grain-size component C2 was related to the regional spring and summer average temperature and winter snowfall, and reflected the intensity of the snow meltwater into the lake. The significant increase of the content of component C2 during 1830~1842 AD and in about 1910 AD thus re-flect the increased water inflow and higher lake level. The significant change of grain size characteristics of the sedi-ments during 1960s-70s was related to human activity.关键词
湖泊沉积/粒度/敏感组分/环境意义/乌伦古湖Key words
lake sediments/grain size/sensitive component/environmental significance/Wulungu Lake分类
天文与地球科学引用本文复制引用
周建超,吴敬禄,曾海鳌..新疆乌伦古湖沉积物粒度特征揭示的环境信息[J].沉积学报,2017,35(6):1158-1165,8.基金项目
国家自然科学基金项目(41671200,41271205, U1138301) （41671200,41271205, U1138301）
科技基础性工作专项(2014FY110400)[National Natural Sci-ence Foundation of China, No.41671200, 41271205, U1138301 （2014FY110400）
Special Basic Research Funds, No. 2014FY110400] （）
