1. College of Forestry Sichuan Agricultural University Chengdu China
2. National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, College of Forestry Sichuan Agricultural University Chengdu China
3. Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science University of Goettingen Göttingen Germany
4. Peoples Friendship University of Russia (RUDN University) Moscow Russia