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The composition of stable carbon isotopes in plants, plant litter, leaf litter, and soil organic matter was studied experimentally in the western part of the northern foothills of the Caucasus and mountainsides. It was found that the changes in carbon isotope composition depending on the vertical zonation do not exceed 8 per thousand and depend on the type of C3 plant communities, its presence in biogeocenosis components (living matter, plant litter, soil organic matter), and the degree of moistening of the plot studied.

The information on the main Russian and foreign electronic botanical scientific editions on "new", nonconventional data media is presented. The characteristic of the specific terms and concepts indispensable for identification of electronic resources is done. The authors offer the working schemes of bibliographic description of electronic publications in computer networks and on physical data media, design with allowance for Russian and international norms and recommendation documents. Each scheme is illustrated by concrete examples of botanical electronic publications.