1. CSIRO Sustainable Agriculture National Research Flagship; CSIRO Land and Water; GPO Box 1666; Canberra; ACT; 2601; Australia
2. USDA-ARS Jornada Experimental Range; MSC 3 JER; NMSU; Box 30003; Las Cruces; NM; 88003-8003; USA
3. Australian Centre for Sustainable Catchments; University of Southern Queensland; Toowoomba; QLD; 4350; Australia
4. Atmospheric Environment Research Centre; Griffith University; Brisbane; QLD; 4111; Australia