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Deserts and xeric shrublands are a biome defined by the World Wide Fund for Nature.[1] Deserts and xeric (ancient Greek xērós, “dry") shrublands form the largest terrestrial biome, covering 19% of Earth's land surface area.[2] 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 during the winter.[1]
Temperature extremes are a characteristic of most deserts. High daytime temperatures give way to cold nights because there is no insulation provided by humidity and cloud cover. The diversity of climatic conditions, though quite harsh, supports a rich array of habitats. Many of these habitats are ephemeral in nature, reflecting the paucity and seasonality of available water.[1] Woody-stemmed shrubs and plants characterize vegetation in these regions. Above all, these plants have evolved to minimize water loss. Animal biodiversity is equally well adapted and quite diverse.[1]
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Deserts of the World / Deserts According to Their Respective Continents / World's Major Deserts
The Nama Karoo in South Africa is a xeric shrubland that receives between 100 and 500 millimetres (4 and 20 in) of rain a year.[3]
The conversion of productive drylands to desert conditions, known as desertification, can occur from a variety of causes. One is human intervention, including intensive agricultural tillage or overgrazing[4] in areas that cannot support such exploitation. Climatic shifts such as global warming or the Milankovitch cycle (which drives glacials and interglacials) also affect the pattern of deserts on Earth.
Xeric shrublands can experience woody plant encroachment, which is the thickening of bushes and shrubs at the expense of grasses.[5] This process is often caused by unsustainable land management practices, such as overgrazing and fire suppression, but can also be a consequence of climate change. As a result, core ecosystem services of the shrublands are affected, including its biodiversity, productivity and groundwater recharge.[6] Woody plant encroachment can be an expression of land degradation.[7]
^Hogan, C. Michael (2009). "Overgrazing". In Draggan, Sidney; Cleveland, Cutler J. (eds.). Encyclopedia of Earth. Washington, D.C.: National council for Science and the Environment.
^Archer, Steven R.; Andersen, Erik M.; Predick, Katharine I.; Schwinning, Susanne; Steidl, Robert J.; Woods, Steven R. (2017), Briske, David D. (ed.), "Woody Plant Encroachment: Causes and Consequences", Rangeland Systems, Springer Series on Environmental Management, Cham: Springer International Publishing, pp. 25–84, doi:10.1007/978-3-319-46709-2_2, ISBN978-3-319-46707-8, S2CID133015720
^Cowling, RM; Hilton-Taylor, C (1994). "Patterns of plant diversity and endemism in southern Africa: An overview". In Huntley, BJ (ed.). Botanical diversity in southern Africa. Pretoria, South Africa: National Botanical Institute. pp. 31–52.
This article incorporates text available under the CC BY-SA 3.0 license. World Wide Fund for Nature. "Deserts and Xeric Shrubland Ecoregions". Archived from the original on 2012-04-25. Retrieved 2019-05-29.
This page was last edited on 10 January 2024, at 16:15