Download Sabkha Ecosystems: Volume III: Africa and Southern Europe by Shahina A. Ghazanfar, Henk J. Beentje (auth.), Münir Öztürk, PDF
By Shahina A. Ghazanfar, Henk J. Beentje (auth.), Münir Öztürk, Benno Böer, Hans-Jörg Barth, Miguel Clüsener-Godt, M. Ajmal Khan, Siegmar-W. Breckle (eds.)
This e-book is a part of the Sabkha Ecosystems sequence. The sequence is designed to supply info on sabkha ecosystems of alternative areas. it's going to upload to the collective wisdom to be had approximately saline ecosystems and in addition specializes in the African zone the place in basic terms restricted info is at present on hand on.
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Extra info for Sabkha Ecosystems: Volume III: Africa and Southern Europe
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1 Introduction Early Neolithic human populations of the Eastern Sahara are known to have inhabited the shorelines of ancient playa lakes as early as 8,000 years ago (Wendorf and Schild 1980). Previous macro botanical studies in Nabta playa by Wasylikowa et al. (1995) have shed the light on their significance for palaeo-environmental studies in the Western Desert of Egypt. Remnants of these settlements are preserved today in playa deposits, such as those found at the site of the Hidden Valley located 65 km north of Farafra Oasis.
Grasslands extend beyond the perimeters of the pans. 1 Map showing location of Makgadikgadi Depression (b) and soil sampling in Botswana (a) The climate in the study area is semi-arid and subject to considerable annual and inter-annual rainfall variability. Generally, most of the rainfall occurs between the months of November and March, while April through October are dry (Thomas and Shaw 1991). Rainfall gradient in Botswana ranges from 600 mm/ year in the northeast to 250 mm/year in the southwest (Thomas and Shaw 1991), with between 400 and 450 mm/year at the Makgadikgadi Depression.
The resulting solutions were analyzed for soluble ions utilizing the methods of Fishman and Friedman (1989). Major ions are reported as micrograms/gram dry weight (PPM) (Table 1). Radium was analyzed by gamma-ray spectrometry based on the emission from the soil of the 186-Kev gamma ray from 226-radium. A weighted sample of dried soil was placed in a metal ointment can and sealed with clear tape. The can was then placed on a high-purity germanium detector for counting for periods of from one to five days.