1. Long-term Research Station of Alpine Forest Ecosystems, Department of Ecology and Forestry, Institute of Forestry, Sichuan Agricultural University, Chengdu 611130, China
2. Department of Soil Ecology and Remediation, School of Life Science, Taizhou University, Taizhou 318000, Zhejiang, China
3. Systems Ecology, Department of Ecological Science, Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands