1. Queensland University of Technology Brisbane QLD 4000 Australia
2. W.K. Kellogg Biological Station and Dep. of Plant. Soil, and Microbial Sciences Michigan State Univ. Hickory Corners MI 49060 USA
3. AgResearch Invermay Agricultural Centre Mosgiel 9053 New Zealand
4. Karlsruhe Institute of Technology Garmisch Bavaria 82467 Germany
5. Scotland's Rural College West Mains Road Edinburgh EH9 3JG UK
6. UK Centre for Ecology and Hydrology Penicuik Edinburgh EH26 0QB UK