南极拉斯曼丘陵湖泊水化学特征

HYDROCHEMICAL PROPERTIES OF LAKES IN LARSEMANN HILL,ANTARCTICA

本文介绍南极拉斯曼丘陵湖泊水化学特征。对１３个湖泊的调查和统计分析表明，湖水以Ｎａ＋和Ｃｌ－为主要优势离子，不含有ＣＯ３２－离子，营养物质（Ｎ、Ｐ、ＳｉＯ２）在湖水中普遍偏低，而且湖水和雪样无机氮组分均以ＮＨ４＋为主，水化学类型比较单一，都属氯化物Ｎａ＋型贫营养水体。Ｎａ＋、Ｃｌ－、ＳＯ４２－的高浓度，特别是Ｂｉｇ湖、莫愁湖和Ｈｅａｒｔ湖水中离子含量明显的高，指示拉斯曼丘陵地区的降水来源以海洋气团为主，并受海洋环境影响强烈。微量元素分布在０．０１～２．０μｇ／ｌ之间，接近于水圈这些元素的浓度值。

This paper presents hydrochemical properties of 13 lakes in Larsemann Hills,Antarctica.Investigations indicate that, in lake water, Na + and Cl - are predominant ions,but no CO 3 2- is present.Hence, all lakes belong to Na + group. The contents of nutrient substance (N, P, SiO 2) in lake water are rather low, whereas, inorganic nitrogen exists mainly in the form of NH 4 + N both in lakes and in snow.And the relatively high concentrations of Na +,Cl - and SO 4 2- , especially those ions in Big Lake,Mochou Lake and Heart Lake,apparently suggest that the precipitation of Larsemann area is dominated by oceanic conditions.The contents of trace elements range from 0.01 to 2.0 μg/l,which are approximately the same as that of hydroesphere in general.