西藏纳木错东部湖水及入湖河流水化学特征初步研究  

Water Chemistry of Eastern Nam Lake Area and Inflowing Rivers in Tibet

作　　者：王君波[1] 朱立平[1] 鞠建廷 汪勇[1,3] 

机构地区：[1]中国科学院青藏高原研究所,北京100085 [2]中国科学杂志社,北京100717 [3]中国科学院研究生院,北京100049

出　　处：《地理科学》2009年第2期288-293,共6页Scientia Geographica Sinica

基　　金：国家重点基础研究发展计划项目(2005CB422002);国家自然科学基金项目(40701194,40571172)资助

摘　　要：对西藏纳木错东部湖区中不同点位的湖水和周边不同位置的入湖河流进行取样,水化学分析结果表明:在主要阴阳离子组成中,Na+和Ca2+分别是湖水和河水的主要阳离子,分别占其阳离子总量的72.4%和71.9%,而湖水和河水的主要阴离子都是HCO3-,分别占其阴离子总量的71.9%和91.2%。从水化学的控制影响因素来看,纳木错湖水主要受蒸发-结晶作用控制,而河水则主要受岩石风化作用影响,其中碳酸盐和硅酸盐的风化影响最为重要,其次是部分蒸发岩的溶解,而区域内湖水蒸发与大气海盐传输也有一定的贡献。Water samples were taken in different sites of eastern Nam Lake, Tibet, as well as in the inflowing rivers located in different positions around the lake. The results of water chemistry analysis indicating that among the major cation and anion composition, Na^＋ and Ca^2＋ were the main cations of lake water and river water, occupying 72.4% and 71.9% of the total cations respectively. While for both lake water and river water, HCO3^- was the main anion with the proportion of 71.9% and 91.2% of the total anions respectively. Mechanisms controlling water chemistry of lake and river water from Nam Lake are illustrated, it is indicated that lake water is mainly controlled by evaporation-crystallization effect, while river water is mainly influenced by rock weathering function. Among them, carbonate and silicate weathering is the most important followed by dissolution of partial evaporation rock, regional lake water evaporation and sea salt transportation by atmospheric circulation also have some contribution.

关 键 词：湖水水化学 河流水化学 蒸发-结晶 岩石风化 纳木错 

分 类 号：P332.7[天文地球—水文科学]