Vorlage  BTU Vorlesung Kopie.001


Ecology of post-mining landscapes

Drastic types of ecosystem disturbances include open-cast mining activities that occur worldwide and induce perturbation of large areas across landscapes. Such harsh human impacts create the need for remediation and restoration measures for mining regions. Reclaimed post-mining sites undergo long time periods of succession. These initial soils, consisting of excavated and dumped material, are characterized by a high vulnerability to erosion, low water holding capacity, lack of nutrients, low pH or sparse vegetation. 


Ecology of arid dune ecosystems 

Sand dunes occur in many parts of the world, not only in deserts and other arid regions but also along many coastlines in humid biomes and environments.  Nowadays, active dune systems are found mainly in the arid and semi-arid regions. The sand dunes of the north-western Negev are the eastern most part of the sand field covering the northern part of the Sinai Peninsula and the northwestern Negev. he climate is determined by a sharp gradient from semi-arid in north to the arid in the south. Average annual rainfall decreases from around 170 mm at the northern edge of the sand field near Yevul to approx. 90 mm near Nizzana.The southern most experimental site Nizzana  is characterized by vegetated linear dunes with mobile crests. The Nizzana Research Site is one of the long-term research sites operated by the Arid Ecosystem Research Centre (AERC) established in 1987 by the Minerva Foundation (Germany) and the Hebrew University of Jerusalem. The Nizzana Sands site offers an excellent example of the structure and functioning of a sandy desert ecosystem and the importance of biological topsoil crusts. Detailed interdisciplinary studies were conducted in the area at different temporal and spatial scales to understanding the ecosystem processes and pattern in in this arid ecosystem. A special focus of the research activities were on the importance of biological soil crusts for ecosystem processes. 

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