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By Jürgen Runge

This 30st jubilee quantity (2010) of "Palaeoecology of Africa" appears again and displays the "state of the paintings" of what's truly recognized on former African climates and ecosystems within the structure of overview articles authored by way of experts within the box. New learn articles on weather and environment dynamics in addition to utilized subject matters on geomorphic risks and destiny environmental tendencies in Africa are included.
This publication can be of curiosity to all excited by ecosystems dynamics, tropical forests, savannahs, deserts and similar improvement difficulties of 3rd global nations, particularly ecologists, botanists, earth scientists (e.g. Quaternary and up to date weather change), local planners. it's going to even be worthwhile for complex undergraduates and postgraduates as a reference for evaluate and evaluation articles in addition to a resource of knowledge for brand spanking new unique manuscripts and experiences at the cutting-edge of long-term and Quaternary and Holocene panorama evolution esp. in subsaharan Africa. Palaeobotanists, Palynologists and Quaternarists will both locate this variation valuable for his or her work.

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Based on the concept of desert flash flood series (Heine and Völkel, 2009), fluvial deposits of Namibian desert valleys are analysed and interpreted. The desert flash flood series model is a concept of a hierarchical dynamic stratigraphy to investigate the relationships between heterogeneous deposits of ephemeral desert streams. Here I present an improved analysis of drivers of fluvial deposition in three Namib Desert valleys, making use of information from data of fluvial deposits itself and of the desert flash flood series model.

Indb 19 10/5/2010 8:14:16 PM 20 Jan Moeyersons et al. North-Africa during the Mid-Holocene in terms of vegetation-atmosphere feedbacks in the climate system. Zeng et al. (1999) confirm that variations in vegetation enhance climate variability in the Sahel and Taylor et al. (2002) show that changes in vegetation in the Sahel can cause substantial reductions in rainfall. In the case of Ethiopia, there is no doubt that deforestation either along the path of the western or eastern trade winds will have contributed to less rainfall in the study area.

Land use change has certainly played an important role in the increase of hillslope runoff production as a result of an increasing runoff coefficient. Descheemaeker et al. (2006, 2009) show that church forests and exclosure forests are able to trap important sediment and water volumes from upslope and so implicitly demonstrate that deforestation in the Geba Basin should have strongly contributed to the increase of the runoff coefficient. It is known that the construction of roads and houses and urbanisation in general contribute to a very considerable increase in runoff coefficient and, above all, can concentrate runoff to higher than natural discharges.

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