猪野泽沉积物有机地球化学指标与花粉组合的关系及其对环境变化的响应

Relationship between Pollen Assemblages and Organic Geochemical Proxies in the Zhuyeze Palaeo-lacustrine Basin Sediments and Its Response to Climate Change

探讨晚冰期以来猪野泽沉积物中的总有机碳(TOC)、碳氮比(C/N)、有机碳同位素(δ13 C)3种有机地球化学指标与花粉组合之间的相互关系。结果表明,猪野泽沉积物中有机地球化学指标和孢粉组合对环境变化的响应程度不同,3种有机地球化学指标对环境变化的整体趋势反应敏感,孢粉组合适于对细节变化的分析。猪野泽沉积物整个剖面中(除～13.0cal ka BP之前的底部砂层沉积段外)TOC和C/N较低值,δ13 C较高值,对应总花粉浓度较低时期;TOC和C/N较高值,δ13 C较低值,对应总花粉浓度较高时期。

This paper examines the relationship between organic geochemical proxies（TOC,C/N ratio and δ13C） and pollen assemblages in the Zhuyeze Palaeo-lacustrine Basin sediments since the Late Glacial.Results show that the reaction extent of organic geochemical proxies and pollen assemblages to environment changes are different in the Zhuyeze Palaeo-lacustrine Basin sediments.The organic geochemical proxies are sensitive to the environmental change for the entire trend,and the pollen assemblages are suitable for analyzing detailed environmental change information.For the entire section（except the sand layer at the bottom of the section）,when the values of TOC,C/N ratio and total pollen concentration are high,the value of δ13C is low,and vice versa.