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文章详细总结了示踪全球环境变化的一系列微生物替代指标。重建古温度的定量指标包括藻类长链烯酮的U、古菌甘油二烷基甘油四醚化合物(GDGTs)的TEX_(86)指标、细菌GDGTs的甲基化指数(MBT)与环化指数(CBT)的组合。古温度的定性指标有脂类单体的氢同位素组成、不饱和脂肪酸的相对含量、有孔虫和硅藻的组合及其生物体的同位素组成和微量元素比值。重建古水文的指标包括有壳变形虫组合、细菌GDGTs的环化指数CBT、细菌和古菌GDGTs的陆源输入指数BIT、古菌和细菌GDGTs的相对丰度R、直链脂肪族化合物的碳优势指数CPI、好氧与厌氧微生物的丰度。古大气CO_2分压的估算可采用藻类长链烯酮的碳同位素组成、有孔虫的硼同位素组成。认为这些微生物指标在古环境重建中潜力巨大,并对一些重要微生物指标的应用原理和限定条件进行了分析。有些指标因受多种环境因子和成岩作用的影响,在应用中需特别的注意,不能无限夸大其应用领域。
The article details a series of microbiological alternatives that track global environmental changes. Quantitative indicators of palaeopore temperature reconstruction include the TEX_ (86) index of algae long-chain enone, the GD_ (86) index of archaeal glycerol dialkylglycerol tetraether compounds (GDGTs), the methylation index (MBT) of bacterial GDGTs and the cyclization index CBT). Paleotemperatures are characterized by the hydrogen isotope composition of lipid monomers, the relative content of unsaturated fatty acids, the combination of foraminiferal and diatoms, and the isotopic compositions and trace element ratios of their organisms. Indicators for the reconstruction of ancient hydrology include the crustacean shell combination, the cyclization index of bacterial GDGTs CBT, the bacterial and archaeal GDGTs terrestrial input index BIT, the relative abundance of archaebacteria and bacterial GDGTs R, the carbon dominance of linear aliphatic compounds Index CPI, abundance of aerobic and anaerobic microbes. The ancient atmospheric CO 2 partial pressure can be estimated by using algae long-chain ketene carbon isotope composition, foraminifera boron isotopic composition. It is considered that these microbial indicators have great potentials in paleoenvironment reconstruction and the application principles and conditions of some important microbial indicators are analyzed. Some indicators due to a variety of environmental factors and diagenetic effects, in the application of special attention, not unlimited exaggeration of its application.