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Ebola in Liberia, Sierra Leone und Guinea; Boko Haram in Nigeria; Revolution in Burkina Faso. Politische Entwicklungen in Westafrika sind Teil der täglichen Berichterstattung in Deutschland. Diese Ereignisse bieten Anlass, sich mit den politischen Strukturen und potentiellen Entwicklungen der Regime in Westafrika zu beschäftigen. In fünf westafrikanischen Ländern sind 2015 Präsidentschaftswahlen geplant. Nigeria macht am 28. März den Anfang. Es folgen dann Togo (Mitte April), Burkina Faso, Guinea und Côte d’Ivoire (alle im Oktober).
Dieser Beitrag ist der Beginn einer vierteiligen Serie zu diesen Wahlen. Im ersten Teil werden allgemeine Trends der Regimeentwicklung in Westafrika vorgestellt und eine Analyse der Situation in Nigeria präsentiert. Im zweiten Teil geht es dann um die Wahlen in Togo, im dritten um die Wahlen im Oktober und schließlich im letzten Teil um einen Vergleich der fünf Wahlprozesse.
Understanding land cover degradation patterns and the effects of geomorphological units on phytodiversity is important for guiding management decisions and restoration strategies in the Sahelian vulnerables zones. This paper describes land cover degradation by combining Landsat TM image analysis and field data measurements in the Gourouol catchment of the Sahelian zone of Burkina Faso. Erdas Imagine 9.2 and Arc-GIS.10 were applied. The change patterns were obtained by superposing land cover maps for 1992 and 2010. The field data were collected by the mean of inventories according to the Braun-Blanquet phytosociological relevés methods. Plot sizes were 50 m x 20 m for woody species and 10 m x 10 m for herbaceous species. Six land cover types were identified and mapped: cultivated lands, bared lands, lowlands, which all spatially increased; and shrub-steppes, grasslands and water bodies, which all spatially decreased. The dynamic patterns based on the geomorphological units were non-degraded lowlands, stable sand dunes and degraded glacis. High plant diversity was found in lowlands, whereas low diversity occurred in glacis. A significant dissimilarity was observed between communities. The Shannon diversity indices in plant communities were approximately close to ln(species richness). The Pielou indices were close to 1, indicating a species fairly good distribution. Our results showed a variation of land cover over time and the effects of geomorphological units on phytodiversity. Furthermore, this variation helps oppose land degradation in the Sahel.