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University of Kassel (2013)

Effects of transformation processes in ’jubraka’ agroforestry systems of the Nuba Mountains, Sudan, on plant diversity

Wiehle, Martin

Titre : Effects of transformation processes in ’jubraka’ agroforestry systems of the Nuba Mountains, Sudan, on plant diversity

Auteur : Wiehle, Martin

Université de soutenance : University of Kassel

Grade : Doktors der Naturwissenschaften (Dr. rer. nat.) 2013

Résumé partiel
The global fears of substantial biodiversity losses in human-managed agricultural systems were underpinned by several studies that observed declines in richness and diversity of traditional varieties, landraces, relic crops and rare species due to recent shortterm processes termed as commercialization, intensification, simplification, transformation or urbanization as well as the upsetting effect during long-term domestication processes in human managed agricultural systems (the term ‘transformation’ will be subsequently used). Also the diverse types of agroforestry systems such as homegardens (HG) and their cultivated species are subjected to these kinds of transformation processes. To enlighten the function, structure and diversity of HGs subjected to ongoing and influencing human-induced transformation as well as domestication process on plant genetic resources, a field study on inter-specific plant and intra-specific indigenous fruit tree diversity was conducted from 2009-2011 in the traditional jubraka HG system in the Nuba Mountains, Kordofan, Sudan. The jubraka represents the most common type of small-scale agroforestry system in the semi-arid zone of Sudan and is distributed from Darfur up to the Kordofan province, southern Sudan. The region is an old settling area with large cultural diversity and is shaped by diverse small and large-scale agricultural cropping systems. Impacting agricultural innovations in this region date back to the beginning of the 19th century with a strong focus on large-scale agriculture to produce mainly cotton as well as staple crops. However, the very one-sided focus on large-scale agriculture and the partly negligence of research hampered the monitoring of recent agronomical changes, which holds in particular true for the existing small-scale jubraka system and its incorporated plant species. The main objective of this study was to assess inter-specific plant species richness and diversity and its driving factors system as well as the intra-specific diversity of two indigenous African fruit tree species (Ziziphus spina-christi and Adansonia digitata) that are both influenced by environmental factors and assumed human interventions.

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