Read e-book online Arid Dune Ecosystems: The Nizzana Sands in the Negev Desert PDF

By Siegmar-W. Breckle, Aaron Yair, Maik Veste

ISBN-10: 3540754970

ISBN-13: 9783540754978

ISBN-10: 3540754989

ISBN-13: 9783540754985

Sand dune dynamics performs a key function in lots of arid deserts. This quantity presents a synthesis of a selected sand dune atmosphere, the Nizzana website within the Negev wasteland. Describing its weather and geophysical/geochemical homes of soils, geological background, natural world, and past/present land-use styles, it elucidates ecological and geomorphological procedures and their interrelations, in keeping with long term tracking, in situ experiments and satellite tv for pc imagery. specific awareness is interested in the effect of the topsoil organic crust in controlling water availability at local/regional scales. The interdisciplinary procedure followed subsequently examine deals an outstanding instance of a hugely complicated and dynamic approach, that may simply be utilized to different sandy ecosystems. this can be a worthy resource of knowledge for soil ecologists and microbiologists, conservation biologists, wasteland ecologists and geographers, geomorphologists, soil scientists and climatologists, teachers, coverage makers and others drawn to deserts and desertification.

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Additional resources for Arid Dune Ecosystems: The Nizzana Sands in the Negev Desert (Ecological Studies)

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This coalescence has been attributed to a deflection by cross wind of the extreme of the ridge during the elongating process (Madigan 1946; Mabbutt and Sullivan 1968; Thomas 1986, 1997). The uniform spacing between the VLDs is a phenomenon common to linear dunes (Twidale 1972a). It is attributed to statistical occurrences (Madigan 1936; Goudie 1969) or to dynamic processes (Folk 1976a). Mabbutt and Wooding (1983) interpret VLD junctions as a response to changes in the dynamic control of 34 H. Tsoar et al.

If there is a common source of all the sand and the climate is homogenous, we can assume that the different hues of red indicate different ages, as has been argued by many (Norris 1969; Folk 1976b; Walker 1979; Gardner and Pye 1981; Wopfner and Twidale 1988; White et al. 1997). Yellowish sand is younger than redder sand. Redness of the Negev sand ensues from iron oxide-bearing clay-sized particles that adhere to the surface of the quartz sand grains. Scanning electron microscope (SEM) analysis shows that the surface of reddened quartz sand is covered by flakes and granular aggregates of iron oxides (Wopfner and Twidale 1988; Pye and Tsoar 1990).

1). The dunefield covers an area of about 12,000 km2. The Sinai and Negev form one geographical unit subdivided artificially by a political border. The dunefield is located in the northern boundary region of the Eastern Sahara subtropical desert, characterized by a long, hot and dry summer and a cool winter with a mean annual rainfall that is below 200 mm. The political border between the Negev and Sinai has generated two distinctly different landscapes that can be delineated from space-based imagery.

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Arid Dune Ecosystems: The Nizzana Sands in the Negev Desert (Ecological Studies) by Siegmar-W. Breckle, Aaron Yair, Maik Veste


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