1. Institute of Botany and Landscape Ecology University of Greifswald 17489 Greifswald Germany
2. Department of Ecology and Environmental Science Umeå Universitet Umea 90187 Sweden
3. Plant Ecology and Ecosystems Research University of Goettingen 37073 Göttingen Germany
4. Ecological‐Botanical Garden University of Bayreuth 95447 Bayreuth Germany
5. Swiss Federal Research Institute WSL Birmensdorf CH‐8903 Switzerland
6. Department of Forest and Park Services Thimphu 1345 Bhutan