Heath

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Heathland
)
Flowering heath on Amrum, Germany

A heath (

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[1] with—especially in Great Britain
—a cooler and damper climate.

Heaths are widespread worldwide but are fast disappearing and considered a rare habitat in Europe.

vegetation type is also found in scattered locations across all continents, except Antarctica
.

Characteristics

Heathland is favoured where climatic conditions are typically hard and dry, particularly in summer, and soils acidic, of low fertility, and often sandy and very free-draining; a

mire
may occur where drainage is poor, but usually is only small in extent. Heaths are dominated by low shrubs, 20 centimetres (8 in) to 2 metres (7 feet) tall.

Heath vegetation can be extremely plant-species rich, and heathlands of Australia are home to some 3,700 endemic or typical species in addition to numerous less restricted species.[3] The fynbos heathlands of South Africa are second only to tropical rainforests in plant biodiversity with over 7,000 species.[4] In marked contrast, the tiny pockets of heathland in Europe are extremely depauperate with a flora consisting primarily of heather (Calluna vulgaris), heath (Erica species) and gorse (Ulex species).

The bird

lorikeets, although numerous other birds from emus to eagles are also common in Australian heathlands. The birds of the South African fynbos include sunbirds, warblers and siskins. Heathlands are also an excellent habitat for insects including ants, moths, butterflies and wasps; many species are restricted entirely to it. One such example of an organism restricted to heathland is the silver-studded blue butterfly, Plebejus argus.[5]

Anthropogenic heaths

Anthropogenic heath habitats are a cultural landscape that can be found worldwide in locations as diverse as northern and western Europe, the Americas, Australia, New Zealand, Madagascar and New Guinea.

These heaths were originally made or expanded by centuries of human clearance of the natural forest and woodland vegetation, by

sand dunes, with a local climate that, even in Europe, can rise to temperatures of 50 °C (122 °F) in summer, drying the sand spot bordering the heathland and further raising its vulnerability for wildfires. Referring to heathland in England, Oliver Rackham says, "Heaths are clearly the product of human activities and need to be managed as heathland; if neglected they turn into woodland".[6]

The conservation value of these human-made heaths has become much more appreciated due to their historical cultural value as habitats;[7] consequently, most heathlands are protected. However they are also threatened by tree incursion because of the discontinuation of traditional management techniques, such as grazing and burning, that mediated the landscapes. Some are also threatened by urban sprawl. Anthropogenic heathlands are maintained artificially by a combination of grazing and periodic burning (known as swailing),[8] or (rarely) mowing; if not so maintained, they are rapidly recolonised by forest or woodland. The recolonising tree species will depend on what is available as the local seed source, and thus it may not reflect the natural vegetation before the heathland became established.

In literature

The heath features prominently in:

Gallery

See also

References

  1. .
  2. ^ Anon. "Heath and Moorland". Field Studies Council. FSC. Archived from the original on 4 October 2013. Retrieved 4 October 2013.
  3. ^ a b c Specht, R.L. 'Heathlands' in 'Australian Vegetation' R.H. Groves ed. Cambridge University Press 1988
  4. ^ a b "Montane fynbos and renosterveld". Terrestrial Ecoregions. World Wildlife Fund.
  5. .
  6. ^ Rackham, Oliver (1997). The History of the Countryside. Phoenix. p. 282.
  7. OCLC 910177358.{{cite book}}: CS1 maint: location missing publisher (link
    )
  8. ^ "Dartmoor fire 'largest in years'". BBC News. 7 April 2013.

External links