Temperate grasslands, savannas, and shrublands
Temperate grasslands, savannas, and shrublands are terrestrial biomes defined by the World Wide Fund for Nature.[1] The predominant vegetation in these biomes consists of grass and/or shrubs. The climate is temperate and ranges from semi-arid to semi-humid. The habitat type differs from tropical grasslands in the annual temperature regime and the types of species found here.[1]
The habitat type is known as prairie in North America, pampas in South America, veld in Southern Africa and steppe in Asia. Generally speaking, these regions are devoid of trees, except for riparian or gallery forests associated with streams and rivers.[1]
Steppes/shortgrass prairies are short grasslands that occur in semi-arid climates. Tallgrass prairies are tall grasslands in higher rainfall areas. Heaths and pastures are, respectively, low shrublands and grasslands where forest growth is hindered by human activity but not the climate.
Tall grasslands, including the tallgrass prairie of North America, the north-western parts of Eurasian steppe (Ukraine and south of Russia), and the Humid Pampas of Argentina, have moderate rainfall and rich soils which make them ideally suited to agriculture, and tall grassland ecoregions include some of the most productive grain-growing regions in the world. The expanses of grass in North America and Eurasia once sustained migrations of large vertebrates such as bison (Bos bison ), saiga (Saiga tatarica ), and Tibetan antelopes (Pantholops hodgsoni ) and kiang (Equus hemionus ). Such phenomena now occur only in isolated pockets, primarily in the Daurian Steppe and Tibetan Plateau.[1] [2]
Temperate savannahs, found in Southern South America, parts of West Asia, South Africa and southern Australia, and parts of the United States, are a mixed grassy woodland ecosystem defined by trees being reasonably widely spaced so that the canopy does not close, much like subtropical and tropical savannahs, albeit lacking a year-round warm climate.[3] In many savannas, tree densities are higher and are more regularly spaced than in forests.[4]
The states of the Eurasian steppes and the North American Great Plains have been largely extirpated through conversion to agriculture. Nonetheless, as many as 300 different plant species may grow on less than three acres of North American tallgrass prairie, which also may support more than 3 million individual insects per acre. The Patagonian Steppe and Grasslands are notable for distinctiveness at the generic and familial levels in various taxa.[1]
Temperate grasslands, savannas, and shrublands ecoregions
[edit ]See also
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References
[edit ]- ^ a b c d e This article incorporates text available under the CC BY-SA 3.0 license. World Wide Fund for Nature. "Temperate Grasslands, Savannas and Shrubland Ecoregions". Archived from the original on 2011年04月01日. Retrieved 2021年04月24日.
- ^ Hilbig, W (1995). The vegetation of Mongolia. Amsterdam: SPB Academic Press.
- ^ Manoel Cláudio da Silva Jánior, Christopher William Fagg, Maria Cristina Felfili, Paulo Ernane Nogueira, Alba Valéria Rezende, and Jeanine Maria Felfili 2006 "Chapter 4. Phytogeography of Cerrado Sensu Stricto and Land System Zoning in Central Brazil" in "Neotropical Savannas and Seasonally Dry Forests: Plant Diversity, Biogeography, and Conservation" R. Toby Pennington, James A. Ratter (eds) 2006 CRC Press
- ^ David R. Harris, ed. (1980). Human Ecology in Savanna Environments . London: Academic Press. pp. 3, 5–9, 12, 271–278, 297–298. ISBN 978-0-12-326550-0.
External links
[edit ]- Wikimedia Commons logo Media related to Temperate grasslands, savannas and shrublands at Wikimedia Commons
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