Shrubland

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Low shrubland in Hawaii Starr 010831-0016 Morella faya.jpg
Low shrubland in Hawaii
Scrub vegetation with cactus in Webb County in south Texas Scrub brush vegetation in south TX IMG 6069.JPG
Scrub vegetation with cactus in Webb County in south Texas

Shrubland, scrubland, scrub, brush, or bush is a plant community characterized by vegetation dominated by shrubs, often also including grasses, herbs, and geophytes. Shrubland may either occur naturally or be the result of human activity. It may be the mature vegetation type in a particular region and remain stable over time, or a transitional community that occurs temporarily as the result of a disturbance, such as fire. A stable state may be maintained by regular natural disturbance such as fire or browsing. Shrubland may be unsuitable for human habitation because of the danger of fire. The term was coined in 1903. [1]

Contents

Shrubland species generally show a wide range of adaptations to fire, such as heavy seed production, lignotubers, and fire-induced germination. [2]

Botanical structural form

In botany and ecology a shrub is defined as a much-branched woody plant less than 8 m high and usually with many stems. Tall shrubs are mostly 2–8 m high, small shrubs 1–2 m high and subshrubs less than 1 m high. [3]

A descriptive system widely adopted in Australia to describe different types of vegetation is based on structural characteristics based on plant life-form, plus the height and foliage cover of the tallest stratum or dominant species. [4]

Shrubland in Prince Edward County, Ontario. Prince Edward County Bird Observatory Scrubland.JPG
Shrubland in Prince Edward County, Ontario.

For shrubs 2–8 m high the following structural forms result:

For shrubs <2 m high the following structural forms result:

Biome plant group

Fynbos in South Africa Fynbos.jpg
Fynbos in South Africa

Similarly, shrubland is a category used to describe a type of biome plant group. In this context, shrublands are dense thickets of evergreen sclerophyll shrubs and small trees, [5] called:

In some places shrubland is the mature vegetation type, and in other places the result of degradation of former forest or woodland by logging or overgrazing, or disturbance by major fires.[ citation needed ]

A number of World Wildlife Fund biomes are characterized as shrublands, including: [6] [7]

Desert scrublands
The Nullarbor plain in Australia Nullabor plain from the indian pacific.jpg
The Nullarbor plain in Australia

Xeric or desert scrublands occur in the world's deserts and xeric shrublands ecoregions, or in areas of fast-draining sandy soils in more humid regions. These scrublands are characterized by plants with adaptations to the dry climate, which include small leaves to limit water loss, thorns to protect them from grazing animals, succulent leaves or stems, storage organs to store water, and long taproots to reach groundwater. [6]

Mediterranean scrublands

Mediterranean scrublands occur naturally in the Mediterranean forests, woodlands, and scrub biomes, located in the five Mediterranean climate regions of the world. Scrublands are most common near the seacoast, and have often adapted to the wind and salt air of the ocean. Low, soft-leaved scrublands around the Mediterranean Basin are known as garrigue in France, phrygana in Greece, tomillares in Spain, and batha in Israel. Northern coastal scrub and coastal sage scrub occur along the California coast, strandveld in the Western Cape of South Africa, coastal matorral in central Chile, and sand-heath and kwongan in Southwest Australia. [7]

Interior scrublands

Interior scrublands occur naturally in semi-arid areas where soils are nutrient-poor, such as on the matas of Portugal which are underlain by Cambrian and Silurian schists. Florida scrub is another example of interior scrublands.

Dwarf shrubs
Moorland on Kilimanjaro Shira moorlands on Kilimanjaro.jpg
Moorland on Kilimanjaro

Some vegetation types are formed of dwarf-shrubs : low-growing or creeping shrubs. These include the maquis and garrigues of Mediterranean climates, and the acid-loving dwarf shrubs of heathland and moorland.

See also

Notes and references

  1. Merriam-Webster's Collegiate Dictionary, 11th Edition (2003).
  2. Mares, Michael S., ed. (1999). "Fire". Encyclopedia of deserts. University of Oklahoma Press. p. 215. ISBN   978-0-8061-3146-7.
  3. Flora of New South Wales, Vol.4 ed. Gwen J. Harden, Royal Botanic Gardens, Sydney ISBN   0-86840-188-9
  4. Costermans, L. F. (1993) Native trees and shrubs of South-Eastern Australia. rev. ed. ISBN   0-947116-76-1
  5. Woodward, Susan. "Mediterranean Shrublands". Geography 235. Radford University. Retrieved 2010-10-07.
  6. 1 2 "Deserts and Xeric Shrublands". World Wildlife Fund. Archived from the original on 2011-01-02. Retrieved 2010-10-07.
  7. 1 2 "Mediterranean Forests, Woodlands and Scrub". World Wildlife Fund. Archived from the original on 2017-01-11. Retrieved 2010-10-07.

Related Research Articles

Biome Community of organisms associated with an environment

A biome is a large collection of flora and fauna occupying a major habitat.

Chaparral Shrubland plant community in western North America

Chaparral is a shrubland plant community found primarily in the U.S. state of California, in southern Oregon, and in the northern portion of the Baja California Peninsula in Mexico. It is shaped by a Mediterranean climate and infrequent, high-intensity crown fires. Chaparral features summer-drought-tolerant plants with hard sclerophyllous evergreen leaves, as contrasted with the associated soft-leaved, drought-deciduous, scrub community of coastal sage scrub, found often on drier, southern facing slopes within the chaparral biome. Three other closely related chaparral shrubland systems occur in central Arizona, western Texas, and along the eastern side of central Mexico's mountain chains (mexical), all having summer rains in contrast to the Mediterranean climate of other chaparral formations. Chaparral comprises 9% of the California's wildland vegetation and contains 20% of its plant species. The name comes from the Spanish word chaparro, which translates to "place of the scrub oak".

Sclerophyll Type of vegetation that has hard leaves, short internodes and leaf orientation parallel or oblique to direct sunlight

Sclerophyll is a type of vegetation that has hard leaves, short internodes and leaf orientation parallel or oblique to direct sunlight that are adapted to long periods of dryness and heat that some types of vegetation present. The word comes from the Greek sklēros (hard) and phyllon (leaf). The term was coined by A.F.W. Schimper in 1898, originally as a synonym of xeromorph, but later was changed.

Deserts and xeric shrublands Habitat type defined by the World Wide Fund for Nature

Deserts and xeric shrublands are a biome defined by the World Wide Fund for Nature. Deserts and xeric shrublands form the largest terrestrial biome, covering 19% of Earth's land surface area. Ecoregions in this habitat type vary greatly in the amount of annual rainfall they receive, usually less than 250 millimetres (10 in) annually except in the margins. Generally evaporation exceeds rainfall in these ecoregions. Temperature variability is also diverse in these lands. Many deserts, such as the Sahara, are hot year-round, but others, such as East Asia's Gobi, become quite cold in winter.

Maquis shrubland Type of biome in the Mediterranean region

Maquis (French) or macchia is a shrubland biome in the Mediterranean region, typically consisting of densely growing evergreen shrubs.

Heath Shrubland habitat

A heath is a shrubland habitat found mainly on free-draining infertile, acidic soils and characterised by open, low-growing woody vegetation. Moorland is generally related to high-ground heaths with—especially in Great Britain—a cooler and damper climate.

Rangeland Biomes which can be grazed by animals or livestock (grasslands, woodlands, prairies, etc)

Rangelands are grasslands, shrublands, woodlands, wetlands, and deserts that are grazed by domestic livestock or wild animals. Types of rangelands include tallgrass and shortgrass prairies, desert grasslands and shrublands, woodlands, savannas, chaparrals, steppes, and tundras. Rangelands do not include forests lacking grazable understory vegetation, barren desert, farmland, or land covered by solid rock, concrete and/or glaciers.

San Luis Obispo Botanical Garden

The San Luis Obispo Botanical Garden is a botanical garden located in the rolling hills of El Chorro Regional Park, between San Luis Obispo and Morro Bay in San Luis Obispo County, within the Central Coast of California region. Its grounds, when completed, will be a 150-acre (61 ha) collection of gardens displaying the diverse plant life of the five Mediterranean climate zones of the world; the Mediterranean Basin, and regions of California, Chile, Australia, and South Africa.

Southwest Australia Biogeographic region of Western Australia

Southwest Australia is a biogeographic region in Western Australia. It includes the Mediterranean-climate area of southwestern Australia, which is home to a diverse and distinctive flora and fauna.

Matorral

Matorral is a Spanish word, along with tomillares, for shrubland, thicket or bushes. It is used in naming and describing a Mediterranean climate ecosystem in Southern Europe.

Mediterranean Basin Region of lands around the Mediterranean Sea that have a Mediterranean climate

In biogeography, the Mediterranean Basin is the region of lands around the Mediterranean Sea that have mostly a Mediterranean climate, with mild to cool, rainy winters and warm to hot, dry summers, which supports characteristic Mediterranean forests, woodlands, and scrub vegetation.

Garrigue Shrubland plant community in the Mediterranean

Garrigue or phrygana is a type of low scrubland ecoregion and plant community in the Mediterranean forests, woodlands, and scrub biome.

Cape Floristic Region Smallest of the six recognised floral kingdoms of the world

The Cape Floristic Region is a floristic region located near the southern tip of South Africa. It is the only floristic region of the Cape Floristic Kingdom, and includes only one floristic province, known as the Cape Floristic Province.

Mediterranean woodlands and forests

The Mediterranean woodlands and forests is an ecoregion in the coastal plains, hills, and mountains bordering the Mediterranean Sea and Atlantic Ocean in North Africa. It has a Mediterranean climate, and is in the Mediterranean forests, woodlands, and scrub biome.

Kwongan

Kwongan is plant community found in south-western Western Australia. The name is a Bibbelmun (Noongar) Aboriginal term of wide geographical use defined by Beard (1976) as

...a type of country ...[that is] sandy and is open without timber-sized trees but with a scrubby vegetation. It consists of plains in an Australian sense of open country rather than in a strict sense of flat country. ... there are two principal plant formations in the kwongan, scrub heath and broombush thicket ... both ... are sclerophyll shrublands and possess a certain unity when contrasted with woodland and forest or steppe and succulent steppe communities.

Chilean Matorral Mediterranean forests, woodlands, and scrub ecoregion in central Chile

The Chilean Matorral (NT1201) is a terrestrial ecoregion of central Chile, located on the west coast of South America. It is in the Mediterranean forests, woodlands, and scrub biome, part of the Neotropical realm.

Renosterveld Vegetation type and plant community of the Cape Floristic Region

Renosterveld is a term used for one of the major plant communities and vegetation types of the Cape Floristic Region which is located in southwestern and southeastern South Africa, in southernmost Africa. It is an ecoregion of the Mediterranean forests, woodlands, and scrub biome.

Coolgardie woodlands Terrestrial ecoregion in Western Australia

The Coolgardie woodlands is an ecoregion in southern Western Australia. The predominant vegetation is woodlands and mallee scrub. The ecoregion is a transitional zone between the Mediterranean-climate forests, woodlands, and shrublands of Southwest Australia and the deserts and dry scrublands of the Australian interior.

Mediterranean forests, woodlands, and scrub Habitat defined by the World Wide Fund for Nature

Mediterranean forests, woodlands, and scrub is a biome defined by the World Wide Fund for Nature. The biome is generally characterized by dry summers and rainy winters, although in some areas rainfall may be uniform. Summers are typically hot in low-lying inland locations but can be cool near colder seas. Winters are typically mild to cool in low-lying locations but can be cold in inland and higher locations. All these ecoregions are highly distinctive, collectively harboring 10% of the Earth's plant species.