The entire plant population of a particular habitat.



(also plant community), the aggregate of vegetable organisms within a relatively homogeneous area. The plants of a phytocoenosis display complex interrelations with other plants, with animals, and with the environment. Each phytocoenosis is a system with a definite composition (consisting as a rule of many ecologically and biologically different species) and a definite structure. The composition and structure of phytocoenoses evolve as a result of the natural selection of plant species capable of coexisting with each other and with animals in certain environmental conditions, and in many instances as a result of the influence of man.

The plants that constitute a phytocoenosis alter their environment in the process of their vital activity, although different groups of plant species (phytocoenotypes) play varying roles. After consuming necessary resources, such as light, water, and minerals, they secrete metabolic wastes into the external environment and leave dead organs in or on the soil, thus leading to the formation of a special phytoclimate. Each phytocoenosis is characterized by specific environmental factors.

The phytocoenosis is the most active part of a biocoenosis and biogeocoenosis (ecosystem). It accomplishes photosynthesis (as a result of the vital activity of photosynthesizing organisms) and nitrogen fixation (by nitrogen-fixing microorganisms) and, together with animals, plays an important part in energy conversion and the cycle of matter on earth. Thus, the phytocoenosis is the major producer of organic substances, which it supplies to heterotrophic organisms, including man. A phytocoenosis is a dynamic system that changes from season to season and year to year. Every phytocoenosis is eventually superseded by another; this process is called succession. The study of phytocoenoses is called phytocoenology.


References in periodicals archive ?
The plot size was delimited in such a way as to represent full floristic composition of the phytocoenosis and varied from 0.
This phytocoenosis has been found on different rock substrates, mainly on limestone, marble and schist, but also on dolomite and conglomerate rocks (pH 6.
This phytocoenosis has been found in most cases on limestone and dolomite, rarely on schist and conglomerate rocks (pH 6.
The phytocoenosis of Cheilanthetum persicae has been found in several locations in Hissar, Zeravshan, Turkestan and Karateginian Mts (Fig.
The phytocoenosis has been recorded in valley bottoms in colline and submontane zones at the relatively low altitudes of 500 to 1,400 m a.
The phytocoenosis inhabits relatively high elevations in the alpine zone, within the elevational range of 2,100 to 3,000 m a.
Therefore, the quantitative estimation of the occurrence of a species in the community need not always be decisive for the determination of the phytocoenosis (Rybnicek 1973).
A forest-brushwood + Carex-Sphagnum community was the parent phytocoenosis of the forest-herbaceous peat.
This phytocoenosis was present in the mire in the Late Glacial and Preboreal and could be identified with the shrub-sedge-brown moss associations described by Liss & Berezina (1981) in Western Siberia.