1. Institute of Soil and Water Conservation, Northwest A & F University Yangling China
2. Ottawa Research and development Centre (ORDC), Agriculture and Agri‐Food Canada Ottawa Ontario Canada
3. CSIRO Agriculture and Food Private Bag No. 5 Wembley Western Australia Australia
4. The UWA Institute of Agriculture, UWA School of Agriculture and Environment, The University of Western Australia LB 5005 Perth Western Australia Australia
5. College of Forestry Northwest A & F University Yangling China