a graphic representation of the seasonal development of plants and animals, as well as their communities. The depiction of phenological spectra is a standard method of geobotanical research. The basic principle of the phenological spectrum was formulated by V. N. Sukachev in 1903 and developed further by the Swiss botanist H. Gams in 1918. The Soviet geobotanist A. P. Shennikov made important contributions (1921, 1927) to the methodology of the phenological spectrum; Shennikov also proposed the term “phenological spectrum.” Variations on the phenological spectrum have been developed by several scientists, including the Soviet botanist I. G. Se-rebriakov (1947) and the Polish scientist A. Lukasiewicz (1967).
The phenological spectrum shows a rectangle corresponding to each plant species. The beginning and end of the phases of plant development, for example, leaf formation, blossoming, and ripening of fruit, are marked in a uniform scale on the rectangle. The phenological spectra of communities are composed of a series of species rectangles (see Figures 1 and 2).
V. B. Sochava has stated that the phenological spectrum of a plant community, considered from an ecological standpoint, provides basic information on habitat regimes. It describes the bio-type and, to some extent, the ecological potential of a facies. Phenological spectra are employed in the protection of nature, meadow cultivation, beekeeping (phenological spectra of honey crops), landscaping, and ornamental floriculture.
REFERENCESShennikov, A. P. Fenologicheskie spektry rastitel’nykh soobshchestv. Vologda, 1927.
Shennikov, A. P. Vvedenie v geobotaniku. Leningrad, 1964.
Shalyt, M. S. “O fitofenologicheskikh spektrakh.” Sovetskaia botanika, 1946, no. 4.
Beideman, I. N. Metodika izucheniia fenologii rastenii i rastitel’nykh soobshchestv. Novosibirsk, 1974.
Lukasiewicz, A. Rytmika rozwojowa bylin. Pozńari, 1967.
G. E. SHULTS