Vegetation
Vegetation is an assemblage of
and lawns; all are encompassed by the term vegetation.The
History of definition
The distinction between vegetation (the general appearance of a community) and
Other concepts similar to vegetation are "
Departing from
The concept of "
An influential, clear and simple classification scheme for types of vegetation was produced by
Classifications
There are many approaches for the classification of vegetation (physiognomy, flora, ecology, etc.).
In the FGDC standard, the hierarchy levels, from most general to most specific, are: system, class, subclass, group, formation, alliance, and association. The lowest level, or association, is thus the most precisely defined, and incorporates the names of the dominant one to three (usually two) species of a type. An example of a vegetation type defined at the level of class might be "Forest, canopy cover > 60%"; at the level of a formation as "Winter-rain, broad-leaved, evergreen, sclerophyllous, closed-canopy forest"; at the level of alliance as "Arbutus menziesii forest"; and at the level of association as "Arbutus menziesii-Lithocarpus dense flora forest", referring to Pacific madrone-tanoak forests which occur in California and Oregon, US. In practice, the levels of the alliance and/or an association are the most often used, particularly in vegetation mapping, just as the Latin binomial is most often used in discussing particular species in taxonomy and in general communication.
Dynamics
Like all the biological systems, plant communities are temporally and spatially dynamic; they change at all possible scales. Dynamism in vegetation is defined primarily as changes in species composition and/or vegetation structure.
Temporal dynamics
Temporally, a large number of processes or events can cause change, but for sake of simplicity, they can be categorized roughly as either abrupt or gradual. Abrupt changes are generally referred to as
Temporal change at a slower pace is ubiquitous; it comprises the field of ecological succession. Succession is the relatively gradual change in structure and taxonomic composition that arises as the vegetation itself modifies various environmental variables over time, including light, water and nutrient levels. These modifications change the suite of species most adapted to grow, survive and reproduce in an area, causing floristic changes. These floristic changes contribute to structural changes that are inherent in plant growth even in the absence of species changes (especially where plants have a large maximum size, i.e. trees), causing slow and broadly predictable changes in the vegetation. Succession can be interrupted at any time by disturbance, setting the system either back to a previous state, or off on another trajectory altogether. Because of this, successional processes may or may not lead to some static, final state. Moreover, accurately predicting the characteristics of such a state, even if it does arise, is not always possible. In short, vegetative communities are subject to many variables that together set limits on the predictability of future conditions.
Spatial dynamics
As a general rule, the larger an area under consideration, the more likely the vegetation will be heterogeneous across it. Two main factors are at work. First, the temporal dynamics of disturbance and succession are increasingly unlikely to be in synchrony across any area as the size of that area increases. That is, different areas will be at different developmental stages due to different local histories, particularly their times since last major disturbance. This fact interacts with inherent environmental variability (e.g. in soils, climate, topography, etc.), which is also a function of area. Environmental variability constrains the suite of species that can occupy a given area, and the two factors together interact to create a mosaic of vegetation conditions across the landscape. Only in
See also
- Biocoenosis
- Biome
- Ecological succession
- Ecoregion
- Ecosystem
- Plant cover
- Tropical vegetation
- Vegetation and slope stability
References
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- ^ Introduction to California Plant Life; Robert Ornduff, Phyllis M. Faber, Todd Keeler-Wolf; 2003 ed.; p. 112
- ^ Thurmann, Jules (1849). Essai de phytostatique appliqué à la chaîne du Jura et aux contrées voisines, ou Étude de la dispersion des plantes vasculaires envisagée principalement quant à l'influence des roches soujacentes. Berne: Jent et Gassmann.
- ^ a b Martins, F. R. & Batalha, M. A. (2011). Formas de vida, espectro biológico de Raunkiaer e fisionomia da vegetação. In: Felfili, J. M., Eisenlohr, P. V.; Fiuza de Melo, M. M. R.; Andrade, L. A.; Meira Neto, J. A. A. (Org.). Fitossociologia no Brasil: métodos e estudos de caso. Vol. 1. Viçosa: Editora UFV. p. 44-85. "Archived copy" (PDF). Archived (PDF) from the original on 2016-09-24. Retrieved 2016-08-25.
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- ^ Humboldt, Alexander von; Bonpland, Aimé (1805). Essai sur la géographie des plantes : accompagné d'un tableau physique des régions équinoxiales, fondé sur des mesures exécutées, depuis le dixième degré de latitude boréale jusqu'au dixième degré de latitude australe, pendant les années 1799, 1800, 1801, 1802 et 1803 (in French). Paris: Chez Levrault, Schoell et compagnie, libraires.
- ^ Humboldt, Alexander von; Bonpland, Aimé (1807). Ideen zu einer Geographie der Pflanzen : nebst einem Naturgemälde der Tropenländer : auf Beobachtungen und Messungen gegründet, welche vom 10ten Grade nördlicher bis zum 10ten Grade südlicher Breite, in den Jahren 1799, 1800, 1801, 1802 und 1803 angestellt worden sind (in German). Tübingen: Bey F.G. Cotta.
- ^ Garcke, Aug.; Schlechtendal, D. F. L. von (1838). Linnaea : Ein Journal für die Botanik in ihrem ganzen Umfange (in German). Vol. 12. Berlin: F. Dümmler.
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Further reading
- Archibold, O. W. Ecology of World Vegetation. New York: Springer Publishing, 1994.
- Barbour, M. G. and W. D. Billings (editors). North American Terrestrial Vegetation. Cambridge: Cambridge University Press, 1999.
- Barbour, M.G, J.H. Burk, and W.D. Pitts. "Terrestrial Plant Ecology". Menlo Park: Benjamin Cummings, 1987.
- Box, E. O. 1981. Macroclimate and Plant Forms: An Introduction to Predictive Modeling in Phytogeography. Tasks for Vegetation Science, vol. 1. The Hague: Dr. W. Junk BV. 258 pp., Macroclimate and Plant Forms: An Introduction to Predictive Modeling in Phytogeography.
- Breckle, S-W. Walter's Vegetation of the Earth. New York: Springer Publishing, 2002.
- Burrows, C. J. Processes of Vegetation Change. Oxford: Routledge Press, 1990.
- Ellenberg, H. 1988. Vegetation ecology of central Europe. Cambridge University Press, Cambridge, Vegetation Ecology of Central Europe.
- Feldmeyer-Christie, E., N. E. Zimmerman, and S. Ghosh. Modern Approaches In Vegetation Monitoring. Budapest: Akademiai Kiado, 2005.
- Gleason, H.A. 1926. The individualistic concept of the plant association. Bulletin of the Torrey Botanical Club, 53:1-20.
- Grime, J.P. 1987. Plant strategies and vegetation processes. Wiley Interscience, New York NY.
- Kabat, P., et al. (editors). Vegetation, Water, Humans and the Climate: A New Perspective on an Interactive System. Heidelberg: Springer-Verlag 2004.
- MacArthur, R.H. and E. O. Wilson. The theory of Island Biogeography. Princeton: Princeton University Press. 1967
- Mueller-Dombois, D., and H. Ellenberg. Aims and Methods of Vegetation Ecology. New York: John Wiley & Sons, 1974. The Blackburn Press, 2003 (reprint).
- UNESCO. 1973. International Classification and Mapping of Vegetation. Series 6, Ecology and Conservation, Paris, [3].
- Van der Maarel, E. Vegetation Ecology. Oxford: Blackwell Publishers, 2004.
- Vankat, J. L. The Natural Vegetation of North America. Krieger Publishing Co., 1992.
External links
Classification
- Terrestrial Vegetation of the United States Volume I – The National Vegetation Classification System: Development, Status, and Applications Archived 2008-11-22 at the Wayback Machine (PDF)
- Federal Geographic Data Committee Vegetation Subcommittee
- Vegetation Classification Standard [FGDC-STD-005, June 1997] (PDF)
- Classifying Vegetation Condition: Vegetation Assets States and Transitions (VAST)
- Interactive world vegetation map by Howstuffworks
- USGS - NPS Vegetation Mapping Program
- Checklist of Online Vegetation and Plant Distribution Maps
- VEGETATION image processing and archiving centre at VITO
- Spot-VEGETATION programme web page
Climate diagrams
- Climate Diagrams Explained Archived 2018-09-28 at the Wayback Machine
- ClimateDiagrams.com Provides climate diagrams for more than 3000 weather stations and for different climate periods from all over the world. Users can also create their own diagrams with their own data.
- WBCS Worldwide Climate Diagrams