By Jürgen Runge
This 30st jubilee quantity (2010) of "Palaeoecology of Africa" seems to be again and displays the "state of the paintings" of what's truly identified on former African climates and ecosystems within the structure of assessment articles authored by means of experts within the box. New learn articles on weather and environment dynamics in addition to utilized themes on geomorphic risks and destiny environmental traits in Africa are included.
This ebook may be of curiosity to all fascinated by ecosystems dynamics, tropical forests, savannahs, deserts and comparable improvement difficulties of 3rd international nations, specially ecologists, botanists, earth scientists (e.g. Quaternary and up to date weather change), nearby planners. it is going to even be worthwhile for complex undergraduates and postgraduates as a reference for assessment and evaluation articles in addition to a resource of data for brand new unique manuscripts and studies at the state-of-the-art of long-term and Quaternary and Holocene panorama evolution esp. in subsaharan Africa. Palaeobotanists, Palynologists and Quaternarists will both locate this version helpful for his or her work.
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Additional info for African palaeoenvironments and geomorphic landscape evolution
Getaneh, Assefa, Tadesse, Solomon, 1997, The Mesozoic succession of the Mekele Outlier (Tigre Province, Ethiopia). Memorie di Scienze Geologiche, 49, pp. 95–116. , Coltorti, M. , 1997, Phases of soil erosion during the Holocene in the Highlands of Western Tigray (Northern Ethiopia): a preliminary report. , (Napoli: Instituto Universitario Orientale), pp. 30–48. , 1981, Rise and fall of Axum, Ethiopia: a geo-archaeological interpretation. American Antiquity, 46, pp. 471–495. L. , 1972, Radio carbon dating of East African lake levels.
The Holocene environmental evolution has been related not only to climate change but also to land use changes introduced since 7 cal ky BP (Philipson, 1998). The role of prehistoric man in the environmental history of Tigray has been summarized by Bard et al. (2000) as follows: (1) the plateau experienced a more humid climate with a denser vegetation cover during the Early Holocene; (2) soil erosion due to vegetation clearing began in the Middle Holocene; (3) agricultural activity was intensified in the Late Holocene, as a consequence of the rise of a state; (4) demographic pressure increased from the early first millennium BC to the mid-first millennium AD, causing soil erosion; (5) environmental degradation and demographic decline occurred in the late first millennium AD; (6) the vegetation cover was regenerated in the early second millennium AD; and (7) progressive vegetation clearance started again in the second half of the second millennium AD.
The dense grassy or woody vegetation slows down valley surface water flow. indb 16 10/5/2010 8:14:13 PM Reconstructing environmental changes since the Last Glacial Maximum (LGM) 17 Figure 3. Dambo at the fringe of Des’a forest. An initial stone fragment mulch and the polygonal structures, Gilgai undulations micro-relief, suggest the presence of a thick vertisol in this channelless valley. (Photo: Jean Poesen). valley bottoms are marked by wedges of alluvial/colluvial valley fills, mostly clayey, sometimes in the form of vertic horizons, sometimes also peat layers, occupying the valley bottom in superposed position.
African palaeoenvironments and geomorphic landscape evolution by Jürgen Runge