东南极阿曼达湾湖泊沉积物物源的元素分析

2008年在东南极阿曼达湾帝企鹅聚集区附近岛屿开展了野外工作，于岛屿湖泊集水区采集到两个短沉积剖面，分别命名为EPI和PI。根据野外实地考察情况和室内分割样品发现EPI剖面主要为泥炭沉积，含有大量水生藻类；PI剖面为黑色泥质沉积，散发出浓烈的粪臭味，沉积物中含有大量的幼年帝企鹅绒毛和少量的残骨。对EPI和PI剖面沉积物、当地风化母岩及水生湖藻进行了部分生源元素和重金属元素浓度分析与对比，结果显示EPI剖面元素含量主要来源于背景母岩和湖藻沉积。PI剖面为帝企鹅粪土沉积序列，沉积物中的TC、TN、TP、Cu、Zn、Hg和Se的含量远远高于风化母岩中的浓度，其主要来源于帝企鹅粪的输入，而Pb元素主要来源于当地风化母岩的贡献。本研究首次显示帝企鹅活动同样可以为南极贫瘠的陆地湖泊系统带来大量的营养物质，但同时也输入了大量的重金属污染元素。

GEOCHEMICAL ANALYSIS TO DETERMINE THE SOURCES OF LAKE SEDIMENTS FROM AMANDA BAY,EAST ANTARCTICA

Two short lake sediment cores EPI and PI were collected at N island, Amanda Bay, East Antarctica during 2007-2008 seasons. The lithology and sedimentology of EPI profile indicate that it was a dominance of peat deposit. The PI sediments were composed of black mud, contained many penguin feathers and bones, and had a strong and unpleasant smell of penguin guano. Elemental concentrations were analyzed on the sediments of EPI and PI, local bedrock and lake algae. The results indicate that elemental concentrations in the sediments of EPI were contributed mainly from bedrock and lake algae. The abundance of TC, TN, TP, Cu, Zn, Hg and Se in PI sediments were much higher than those in local bedrock, they were mainly from emperor penguin guano input while element Pb was contributed mainly from geochemical background. For the first time, this study demonstrates that emperor penguin transports a lot of marine-derived nutrients as well as much heavy metal pollutants onto lake ecosystems.