1 College of Grassland Science, Key Laboratory of Grassland Ecosystem of the Ministry of Education, Gansu Agricultural University, Lanzhou, Gansu, China.
2 Department of Disturbance Ecology, BayCEER, University of Bayreuth, Bayreuth, Germany.
3 College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China.
4 Laboratoire sur les écosystèmes terrestres boréaux, Département des Sciences Fondamentales, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada.