1. Department of Biogeography; University of Bayreuth; D-95447; Bayreuth; Germany
2. Department of Micrometeorology; University of Bayreuth; D-95447; Bayreuth; Germany
3. National Park Caldera de Taburiente, La Palma; E-38750; El Paso; La Palma; Spain
4. Department of Soil Ecology; University of Bayreuth; D-95447; Bayreuth; Germany
5. Department of Disturbance Ecology; University of Bayreuth; D-95447; Bayreuth; Germany