Lignin in the Organic Matter of the Soils of the Russian Plain as Biomarker of Palaeoenvironment

3rd International Conference Environment and Sustainable Development of Territories: Ecological Challenges of the 21st Century

生态环境科学;地球科学;经济学

Kovalev, I.V.^1 ; Kovaleva, N.O.^1

Soil Science Faculty, Lomonosov Moscow State University, Moscow, Russia^1

关键词: 13C NMR spectrum;    Existing systems;    Herbaceous species;    Isotope geochemistry;    Lignin structure;    Palaeoenvironment;    Radiocarbon dating;    Soil humic acids;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/107/1/012116/pdf
DOI  :  10.1088/1755-1315/107/1/012116

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

It has been shown by the methods of biochemistry, nuclear magnetic resonance, and isotope geochemistry that the proportions of lignin phenols may be used as molecular traces of paleovegetation due to their biochemical and physiological specificity and high resistance to decomposition. Lignin structures have been detected in soils and in iron-manganese concretions. The comparison of the13C NMR spectra of native lignin preparations isolated from different woody and herbaceous species with those of soil humic acids makes it possible to identify many characteristic shifts of lignin nature in humic acids at 56, 102, 115, 119, 131, 147, 151-152, 160, and 166 ppm. The information role of biomarker has been tested at the reconstruction of paleovegetation in the uplands of the Russian Plain. The representativeness of information has been increased using the isotope analysis (δ13C) and the radiocarbon dating; a new parameter - the composition of lignin phenols - has been introduced to the existing system of biomarkers.