Jens Gebauer

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Urban and peri-urban agriculture (UPA) significantly contributes to food and nutritional security of urban dwellers in many African countries. Economic and demographic pressures often lead to transformation of subsistence-oriented traditional homegardens into commercial production units. Such transformation is claimed to result in decreasing plant(More)
The small leaved white cross berry (Grewia tenax [Forssk.] Fiori) is a fruit-producing deciduous shrub or small tree of widespread occurrence in semi-arid and sub-humid tropical climates. Despite its well-recognized potential and high prices on local markets, there are no commercial plantations in Sudan. Wild plants have continuously been used to meet the(More)
Several botanical studies have been conducted in different parts of Oman, but knowledge about agro-biodiversity in the rapidly decaying ancient mountain oases of this country remains scarce. To fill this gap we assessed the genetic resources of three mountain oases in the al-Hajar range using a GIS-based field survey and farmer interviews. While arid(More)
Traditional homegardens (HGs) are considered to harbor high levels of plant diversity and have been therefore characterized as sustainable agro-ecosystems suitable for on-farm (incl. circa situm) conservation of plant genetic resources. While the functional structure of traditional HGs is poorly understood specifically for semi-arid and arid regions, their(More)
Um die Auswirkungen des Klimawandels auf den deutschen Obstbau zu quantifizieren, befasst sich diese Arbeit mit langzeitlichen Trends in der Verfügbarkeit von Kältewirkung (Chilling) für Obstgehölze. Die Berechnungen erfolgten nach dem Kältestunden-Modell und dem Kälteportionen-Modell (Dynamisches Modell). Aus täglichen Aufzeichnungen von 43 Wetterstationen(More)
A verdant strip of urban and peri-urban agriculture (UPA) lines the banks of the River Nile at Khartoum (Sudan), but little is known about its physical structure and species composition. This study was conducted in 120 gardens, covering 160 ha at the urban locations of Tuti Island and Shambat and the peri-urban location of El Halfaya to determine the extent(More)
Grewia tenax (Forssk.) Fiori is a wild fruit species with multiple uses in different parts of the Tropics and Subtropics. It is common on the Arabian Peninsula and has also been recorded in southern Oman. To date, no record of the species exists for the northern part of this country. To close this distributional gap, three sites in the al-Hajar mountains of(More)
Neglected and underutilized species often play a vital role in securing food and livestock feed, income generation and energy needs of rural populations. In spite of their great potential little attention has been given to these species. This increases the possibility of genetic erosion which would further restrict the survival strategies of people in rural(More)
During the past years the Sultanate of Oman which is located at the south-eastern tip of the Arabian peninsula has been studied for its cultivated plant genetic resources. Data from this study, that commenced in 2002 and information from the literature have been combined to document the millenia-old cultivation history of many agri- and horticultural crop(More)
Seedlings of the salt-tolerant plant grewia [Grewia tenax (Forssk.) Fiori] and the moderately salt-tolerant tamarind (Tamarindus indica L.) were grown under controlled conditions and treated daily with NaCl solutions to investigate mechanisms of tolerance to salinity. Leaf micromorphology, cuticular wax load, chlorophyll fluorescence and light remission, as(More)