Plakor ( Greek p1ax - plane, plain) - a flat or slightly undulating watershed area of a plain river basin, in the soil and vegetation cover of which typical zonal features (upland vegetation) are better represented. It is also the location and ecotope of phytocenosis , which are most free from the influence of all factors that reduce the impact of climate on vegetation .
The term "placor" was proposed by G. N. Vysotsky . Under the conditions of plakors, the most typical soils and typical vegetation develop. Requirements for plakors are the requirements of the averaged (loamy) soil texture, moderate elevation and drainage, as well as plainness. In their pure form, placors are quite rare, but this concept is convenient for constructing various kinds of theoretical schemes.
In addition, many habitats are so slightly different from the plateau that they can be considered as such (slopes with small exposures, high terraces of river valleys, and the like). The study of upland vegetation is the basis of geobotanical zoning of the territory and determination of strategies for its rational use.
See also
- Natural boundary
- Ecotope
- Hollow
- Association (biology)
Literature
- Ukrainian Soviet Encyclopedia : in 12 volumes = Ukrainian Radyansk Encyclopedia (Ukrainian) / Ed. M. Bazhan . - 2nd view. - K .: Goal. Editorial URE, 1974-1985.
- Field geobotany / Ed. A.V. Zalensky, A.A. Korchagin and E.M. Lavrenko. - M .; L .: Publishing House of the Academy of Sciences of the USSR Council of Socialist Organizations, 1959. - T. 1. - 444 p.
- Mirkin B.M., Rosenberg G.S. Phytocenology. Principles and methods. - M .: Nauka, 1978.- 212 p.
- Rabotnov T.A. Phytocenology. - M.: Publishing House of Moscow State University, 1978.- 384 p.
- Shennikov A.P. Introduction to geobotany. L .: Publishing house of Leningrad State University, 1964 .-- 447 p.