1. Lehrstuhl für Grünlandlehre; Technische Universität München; Alte Akademie 12 85354 Freising Germany
2. Department of Ecology; College of Natural Resources and Environment; South China Agricultural University; Guangzhou 510642 China
3. Research School of Biology; ANU College of Medicine, Biology and Environment; Australian National University; Canberra ACT 0200 Australia