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In this article we consider the opportunity of the use of tree-ring ?13C carbon isotope composition records for detecting and recognizing changes in forest ecosystems in the south of the West Siberian Plain where the growth conditions for conifer trees are generally optimal. Trees grow in the closed stands. The wood of Larix sibirica and Pinus sylvestris trees was chosen as object of our research. The values of carbon isotope composition (?13?) were measured in tree ring cellulose and lignin of Larix sibirica and ...