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Topography, Climate and Soils

  • Gary Brown
  • Bruno A. Mies
Chapter
Part of the Plant and Vegetation book series (PAVE, volume 7)

Abstract

The Socotra Archipelago is located in the north-western part of the Indian Ocean, close to the Horn of Africa. Socotra itself (ca. 3,600 km2) can be divided into three main topographical regions: (1) the granitic Hagghier mountains; (2) limestone plateaus, which occur between 300 and 700 m and occupy by far the largest part of the island; and (3) coastal plains. The arid tropical climate of Socotra is characterised by pronounced seasonal, altitudinal, spatial and inter-annual variability, with the seasonally reversing monsoons exerting a major influence on weather patterns. The overall arid macroclimate is also greatly modified by the diverse topography of the island and the extent of cloud cover. Rainfall is the chief form of available water at the lower elevations, either directly or indirectly through surface and subsurface redistribution. However, at higher altitudes, where forest is developed, fog and mist provide an important input of moisture, substantially augmenting the amount of plant-available water. Due to the arid nature of the climate, soils are poorly developed over much of the island. Pedogenesis involving chemical processes and the synthesis of organic matter is mainly restricted to the upper mesic montane zone where there is dense vegetation cover and the climate is more humid.

Keywords

Cloud Cover Arid Desert Dense Vegetation Cover Limestone Plateau African Mainland 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Beydoun ZR, Bichan HR (1970) The geology of Socotra Island, Gulf of Aden. Q J Geol Soc Lond 125:413–446CrossRefGoogle Scholar
  2. Beyhl FE, Mies BA (1996) Remarks on the vegetation ecology of Socotra. In: University of Aden (ed) First international scientific symposium on Socotra Island: present and future, vol 4. Aden, 24–28 Mar 1996,pp 25–62Google Scholar
  3. Cheung C, DeVantier L (2006) Socotra – A natural history of the islands and their people. Odyssey Book and Guides, Hong KongGoogle Scholar
  4. Durn G (2003) Terra rossa in the Mediterranean region: parent materials, composition and origin. Geol Croat 56:83–100Google Scholar
  5. Eren M, Kadir S, Hatipoglu Z, Gül M (2008) Quaternary calcrete development in the Mersin area, southern Turkey. Turk J Earth Sci 17:763–784Google Scholar
  6. Fleitmann D, Burns SJ, Neff U, Mangini A, Matter A (2003) Changing moisture sources over the last 330,000 years in Northern Oman from fluid-inclusion evidence in speleothems. Quat Res 60:223–232CrossRefGoogle Scholar
  7. Fleitmann D, Matter A, Burns SJ, Al-Subbary A, Al-Aowah MA (2004) Geology and Quaternary climate history of Socotra. In: Krupp F (ed) Fauna of Arabia. Socotra Archipelago, vol 20. Libri, BaselGoogle Scholar
  8. Gadgil S (2003) The Indian monsoon and its variability. Annu Rev Earth Planet Sci 31:429–467CrossRefGoogle Scholar
  9. Goudie AS (1973) Duricrusts in tropical landscapes. Clarendon Press, OxfordGoogle Scholar
  10. Haake B, Rixen T, Ittekkot V (1993) Variability of moonsonal upwelling signals in the deep western Arabian Sea. Mitt Geol-Paläont Inst Univ Hamburg (SCOPE/UNEP special volume) 76:85–96Google Scholar
  11. Hildebrandt A, Al Aufi M, Amerjeed M, Shammas M, Eltahir EAB (2007) Ecohydrology of a seasonal cloud forest in Dhofar: 1. Field experiment. Water Resour Res 43:W10411CrossRefGoogle Scholar
  12. IUSS Working Group WRB (2006) World reference base for soil resources 2006, 2nd edn, World Soil Resources Reports No. 103. FAO, RomeGoogle Scholar
  13. Kämmer F (1974) Klima und Vegetation von Teneriffa besonders im Hinblick auf den Nebelniederschlag. Scripta Geobotanica 7Google Scholar
  14. Kopp H (1999) Abiotische Geofaktoren. In: Wranik W (ed) Sokotra. Mensch und Natur. Jemen-Studien Band 14. Dr Ludwig Reichert Verlag, WiesbadenGoogle Scholar
  15. Middleton N, Thomas D (1997) World atlas of desertification. UNEP/Arnold, LondonGoogle Scholar
  16. Mies BA (1999a) Flora und Vegetation der Insel Sokotra. In: Wranik W (ed) Sokotra. Mensch und Natur. Jemen-Studien Band 14. Dr Ludwig Reichert Verlag, WiesbadenGoogle Scholar
  17. Mies BA (2001) Flora und Vegetationsölogie der Insel Soqotra. Essener Ökologische Schriften 15. Westarp Wissenschaften, HohenwarslebenGoogle Scholar
  18. Mies BA, Beyhl FE (1998) The vegetation ecology of Socotra. In: Dumont HJ (ed) Proceedings of the first international symposium on Soqotra Island: present and future. United Nations, New YorkGoogle Scholar
  19. Miller AG, Morris M (1988) Plants of Dhofar. The southern region of Oman. Traditional, economic and medicinal uses. Diwan of the Royal Court, Sultanate of OmanGoogle Scholar
  20. Miller AG, Morris M (2004) Ethnoflora of the Socotra Archipelago. Royal Botanic Garden, EdinburghGoogle Scholar
  21. Noy-Meir I (1973) Desert ecosystems: environment and producers. Annu Rev Ecol Syst 4:25–51CrossRefGoogle Scholar
  22. Pietsch D (2006) Böden der Trockentropen. Prozess- und Strukturindikatoren-gestützte Analyse geschichteter, polygenetischer und degradierter Böden der Insel Socotra (Jemen). Jemen-Studien Band 17. Dr Ludwig Reichert Verlag, WiesbadenGoogle Scholar
  23. Pietsch D, Kühn P (2009) Soil developmental stages of Cambisols and Calcisols on Socotra island. Soil Sci 174:292–302CrossRefGoogle Scholar
  24. Pietsch D, Morris M (2010) Modern and ancient knowledge of conserving soils in Socotra Island, Yemen. In: Zdruli P, Pagliai M, Kapur S, Cano AF (eds) Land degradation and desertification: assessment, mitigation and remediation. Springer, BerlinGoogle Scholar
  25. Popov G (1957) The vegetation of Socotra. J Linn Soc Bot Lond 55:706–720CrossRefGoogle Scholar
  26. Royal Geographical Society (1978) Socotra (Samhah, Darsa). Map 1:125000. Royal Geographical Society, LondonGoogle Scholar
  27. Russian Military Map (1978) Suqutra, Samhah, Darsa. Military Map 1:200 000, MoskwaGoogle Scholar
  28. Scholte P, de Geest P (2010) The climate of Socotra Island (Yemen): a first-time assessment of the timing of the monsoon wind reversal and its influence on precipitation and vegetation patterns. J Arid Environ 74:1507–1515CrossRefGoogle Scholar
  29. Shakun JD, Burns SJ, Fleitmann D, Kramers J, Matter A, Al-Subary A (2007) A high-resolution, absolute-dated deglacial speleothem record of Indian Ocean climate from Socotra Island, Yemen. Earth Planet Sci Lett 259:442–456CrossRefGoogle Scholar
  30. Walter H, Breckle S-W (1999) Vegetation und Klimazonen, 7th edn. Ulmer, StuttgartGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Gary Brown
    • 1
  • Bruno A. Mies
    • 2
  1. 1.Department of Biology College of ScienceSultan Qaboos UniversityMuscatOman
  2. 2.Department of BotanyUniversitäet Duisburg-EssenEssenGermany

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