Investigation of microbial ecosystems and their turnover processes in the sediments of the saline, alkaline Lake Van as part of the ICDP Drilling Project - PaleoVan -

在ICDP钻探项目“古货车”的框架内，将从盐碱湖货车（土耳其）获取长沉积物岩心。拟议项目的目标是表征货车湖沉积物中主要系统发育群的微生物过程、细胞丰度和分布。该项目的一部分将致力于确定和量化沉积柱中的周转过程，另一部分将侧重于微生物的空间变异性，并研究不同的微生境，例如火山灰层周围的单一纹层和沉积界面。周转率测量，直接放射性示踪剂实验和数值模拟的周转过程的基础上溶解的化合物在孔隙水的浓度梯度，将被用来获得一个过程的毛和净速率。将通过计数总微生物细胞丰度和定量主要微生物类群（例如细菌、芽孢杆菌、硫酸盐还原菌、产甲烷菌、ANME等）对样品进行微生物学表征。这些数据将提供对碱性沉积物基本过程的基本了解，这种环境迄今尚未得到更详细的研究。

Within the framework of the ICDP drilling Project „PaleoVan“ long sediment cores from saline, alkaline Lake Van (Turkey) will be retrieved. The goals of the proposed project are the characterization of the microbial processes, cell abundance and distribution of the major phylogenetic groups in the sediments of Lake Van. One part of the project will be devoted to the identification and quantification of the turnover processes in the sediment column, the other part will focus on the spatial variability of microbes and look at the different microhabitats, e.g single laminae and sedimentary interfaces around volcanic ash layers. For turnover rate measurements, both direct radiotracer experiments and numerical modeling of turnover processes based on concentration gradients of dissolved compounds in the porewater will be used in order to obtain the gross and the net rate of a process. The microbiological characterization of the samples will be done by enumeration of the total microbial cell abundance and the quantification of the dominant groups of organisms (e.g. Bacteria, Archaea, Sulfate reducers, methanogens, ANME, etc.). The data will provide a basic understanding of the fundamental processes in alkaline sediments, an environment that has so far not been studied in greater detail.