湖泊沉积物生物硅指标在不同时间尺度下的气候/环境指示意义研究  

Study on the climatic/environmental significance of biogenic silica proxy in lake sediments at different time scales

作　　者：刘斌[1] 盛恩国 蓝江湖[2] 郁科科 周慷恩 LIU Bin;SHENG Enguo;LAN Jianghu;YU Keke;ZHOU Kangen(Zunyi Normal College,Zunyi 563006,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China;BaoJi University of Arts and Sciences,Baoji 721013;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]遵义师范学院,遵义563006 [2]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061 [3]宝鸡文理学院,宝鸡721013 [4]中国科学院大学,北京100049

出　　处：《干旱区资源与环境》2020年第12期143-147,共5页Journal of Arid Land Resources and Environment

基　　金：国家自然科学青年科学基金项目(41702190);遵义市科技局、遵义师范学院联合科技研发资金项目(遵市科合计[2018]06号);东华理工大学江西省大气污染成因与控制重点实验室开放基金(AE1802);遵义师范学院博士启动课题(遵师BS[2014]02号)资助。

摘　　要：通过测定青海湖沉积物生物硅和其他气候代用指标(如粒度、总有机碳等),并与区域其他载体记录对比,结果表明青海湖沉积物生物硅在短时间尺度上(数十年尺度)与粒度等指标不一致,甚至呈现反相关关系,而在长时间尺度上(数百年-千年尺度)生物硅与粒度、总有机碳指标具有一致变化趋势,能够反映长期温度和降水变化趋势。我们推断青海湖沉积物生物硅指标较适用于指示长时间尺度气候变化,这对今后利用生物硅指标进行古气候和古环境研究具有重要意义。The biogenic silica contents and other proxies of sediments from lake Qinghai were determined. The results showed that the relationship between biogenic silica and total organic carbon(TOC) was not obvious at the short time scale(decades scale), but inversely correlated with the particle size. While at the long time scale(centennial-millennium scale), biogenic silica had a consistent change trend with TOC and particle size, which could reflect the long-term temperature change trend. Comparison of the biogenic silica contents with the records of tree rings and ice cores in the study area showed that the biogenic silica contents of lake Qinghai sediments is suitable for indicating long-term climate change. This is of great significance for the study of palaeoclimate and palaeoenvironment by using biogenic silica in the future.

关 键 词：青海湖 生物硅 环境代用指标 时间尺度 

分 类 号：P343.3[天文地球—水文科学]