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Discovery of bacteriopheophytin-a in lacustrine deposits from Lake Zigetang on the central Tibetan Plateau and its paleoenvironmental significance

引用

Science China Earth Sciences 2017年第12期60卷 2171-2180页

作者： LI HuaYong ZHANG HuCai CHANG FengQin ZHENG Qian ZHANG WenXiang LEI GuoLiang LEI YanBin PU Yang JI JunFeng Key Laboratory of Plateau Lake Ecology and Global Change Yunnan Provincial Key Laboratory of Plateau Geography Process and Environment ChangesCollege of Tourism and Geography ScienceYunnan Normal UniversityKunming 650500China School of Resource Environment and Tourism Anyang Normal UniversityAnyang 455000China College of Urban and Environment Sciences Central China Normal UniversityWuhan 430079China Key Laboratory for Subtropical Mountain Ecology(Ministry of Science and Technology and Fujian Province Funded) Fujian Normal UniversityFuzhoa 350007China Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100085China School of Remote Sensing Nanjing University of Information Science&TechnologyNanjing 210044China Institute of Surface Geochemistry Department of Earth SciencesNanjing UniversityNanjing 210093China

Lake Zigetang is located on the central Tibetan Plateau(TP) and represents a rare but typical meromictic lake in *** lake's stable meromixis sustains microflora communities, and changes in these communities are relatively independent of climate. Therefore, these communities can be used as paleoclimate proxies. In this paper, the stratification properties and their relationships with the microflora of Lake Zigetang were analyzed. We found that water depth and climate conditions were two important factors for maintaining meromixis in Lake Zigetang. Generally, stratification was enhanced during warm periods, while temperature differences between the mixolimnion and monimolimnion were decreased during cold periods. The presence of anoxygenic phototrophic bacteria(APB) was demonstrated by the discovery of bacteriopheophytin-a(Bph-a) in the *** bacterial community is mainly concentrated at the bottom of the chemocline and the top of the monimolimnion, where it forms a thin APB layer. Moreover, total APB productivity is mainly affected by the light intensity penetrating to the APB layer,which exponentially increases as the thermocline becomes shallow. Therefore, high Bph-a values in the lake corresponded to a shallow thermocline and warm periods, low Bph-a values corresponded to cold periods, and zero changes indicated that the water was completely mixed and reflected an extreme cold climate or low lake level period. Thus, Bph-a can be used as a climate proxy to reconstruct the history of lake stratification and climate changes.

关键词： Lake Zigetang Tibetan Plateau meromictic lakes Thermocline Anoxygenic phototrophic bacteria

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