巴丹吉林沙漠湖泊颜色季节性变化成因  

Causes of seasonal change of lake color in the Badain Jaran Desert

作　　者：张欣 董治宝 南维鸽 陈国祥 石唯康 王晓枝 高冲 Zhang Xin;Dong Zhibao;Nan Weige;Chen Guoxiang;Shi Weikang;Wang Xiaozhi;Gao Chong(School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,陕西西安710119

出　　处：《中国沙漠》2023年第6期89-97,共9页Journal of Desert Research

基　　金：国家自然科学基金项目(42171004,41930641);第二次青藏高原综合科学考察研究项目(2019QZKK0403)。

摘　　要：粉色盐湖往往被称为玫瑰湖,关于其颜色随时间变化原因研究较少。本研究通过野外考察观测与室内X射线衍射、高通量测序等方法,对巴丹吉林沙漠玫瑰湖达格图湖泊颜色随季节变化成因进行分析。结果表明:达格图属于高盐高碱的氯化物型盐湖。夏季水温高、水中营养物质丰富,造成嗜盐嗜碱有色微生物大量繁殖,使湖水呈现亮粉色;秋季随着水温降低、水量减少,有色微生物减少或消失,湖水变为无色透明。此时混杂赤铁矿的氯化钠结晶大量析出,在湖底形成粉色盐层,使整个湖泊呈现淡粉色。不同季节微生物数量变化造成水中溶解氧不同,赤铁矿因此发生氧化还原反应,造成不同季节结晶盐中赤铁矿含量随之改变。Pink salt lake is often called rose lake,and there are few studies on the causes of the lake colour changes over time.In this study,the causes of seasonal changes in the colour of Dagetu Salt Lake,a rose lake in the Badain Jaran Desert,were analysed through field observations and indoor experimental methods such as Xray diffraction and high-throughput sequencing.The results show that Dagetu is a chloride type salt lake with high salinity and alkalinity.In summer,the high water temperature and nutrient-rich water caused the proliferation of haloalkaliphilic and coloured microorganisms,causing the lake to turn pink.In autumn,as the water temperature decreases and the amount of water decreases or disappears,the water becomes colourless and transparent.At this point a large number of sodium chloride crystals mixed with hematite precipitate out,forming a pink salt layer on the bottom of the lake,making the lake look pale pink.Changes in microbial populations from season to season result in different dissolved oxygen in the water and consequent redox reactions in the hematite,resulting in changes in the hematite content of the crystalline salt from season to season.

关 键 词：玫瑰湖 沙漠湖泊 结晶盐 群落组成 巴丹吉林沙漠 

分 类 号：K928.43[历史地理—人文地理学]