Central South University of Forestry and Technology, Hunan Academy of Forestry, Central South University of Forestry and Technology, Central South University of Forestry and Technology, Central South University of Forestry and Technology, Virginia Tech, Central South University of Forestry and Technology, affiliation not provided to SSRN, Central South University of Forestry and Technology, Central South University of Forestry and Technology and Central South University of Forestry and Technology