Plant Formation

Plant Formation

 

a group of plant associations whose main strata consist of the same species (for example, all associations in which meadow foxtail or Scotch pine is dominant). A plant formation can include genetically and ecologically different associations. For example, a formation of Scotch pine forests can embrace sphagnum pine groves and pine groves with plants typical of broad-leaved forests. Hence, some modern geobotanists use the term “plant formation” without any connotation of rank or taxonomic unit. The term was introduced by the German plant geographer A. Grisebach in 1838 and was used for a long time thereafter in a sense close to plant association or phytocoenosis. Plant associations are usually combined into classes.

References in periodicals archive ?
Thus, grafting can be used to propagate 'Jabuticaba' plants in large scale, because it provided up to 73% of plant formation, according to the method used by Sasso et al.
It covers an area of 1080 Ha of plant formation all confused 60% of this area is occupied by the cork oak M'hamdia [14] and includes six C.F.W.O cantons [6].
The contract is for the production of Rgfor (hereinafter referred Rgfor Step1) at reduced to five types of plant formation nomenclature, from an image segmentation provided by IGN.
Despite the large diversity in the formation of buds by species, there is certain regularity in nature of cereal regrowth, which manifests itself primarily in the partial contribution of various groups in buds to the process of plant formation. This is evidenced by the experimental data collected in summer in Mordovia (grass was cut at a height of 6-8 cm followed by counting the number of shoots formed per 100 regrown shoots in 5-6 replicates) (Fig.
The heat and light of the sun easily penetrate this type of plant formation and permit the growth of a dense herbaceous layer consisting of annual and perennial species.
Therefore, a rate of 40% plant formation was adopted as the boundary point for distinguishing dominant and recessive gene expression in both the [F.sub.2] and [F.sub.1][BC.sub.1] generations (Table 3).
These data, arcsine-transformed for statistical analysis, were a) percent of each plant formation; b) percent of northern-eastern species in each vertebrate class, those with known or presumed Arcto-Tertiary Geofloral affinities on the bases of geography, habitat, and fossil record, hereafter termed eastern; c) percent of predominantly southwestern-Mexican species per class, those with known or presumed Madro-Tertiary Geofloral affinities, again using geographic, ecologic, and prehistoric guidelines, hereafter termed western; d) percent of all vertebrates with western range limits in the county; e) percent with eastern range limits; and f) percent of vertebrates typifying each of three prominant plant associations (deciduous oak-hickory, evergreen oak-juniper, bluestem-Indiangrass).
In this context, a recovery of the coastal landscape through an efficient and rapid restoration of autochthonous plant formations in the degraded areas represents an urgent and challenging task.
From the biogeographic standpoint, this bioclimate extends throughout the humid and subhumid areas of the Boliviano-Tucuman province, a biogeographical territory belonging to the great Andean Region (RIVAS-MARTINEZ & NAVARRO, 1994; NAVARRO & MALDONADO, 2004), and which--due to its altitude--determines the existence of different ecological belts and ecosystems and the development of various plant formations such as Pluviseasonal semi-deciduous seasonal evergreen forests, montane cloud grasslands and shrubby and herbaceous subhumid steppes.
The arid and dry plant formations of South America and their floristic connections: new data, new interpretation?
His work is characterised by the recurrence of themes and ideas constantly associated with related visual motifs and symbols: the female form, the arabesque, rock and plant formations, seed-pod and flower, sun and moon.