[1]Academy of Forest Inventory and Planning, State Forestry Administration,Beijing 100714, China;
[2]Natural Resources Institute Finland, Helsinki, Finland.;
[3]Forest Service, United States Department of Agriculture, Ogden, UT, USA.;
[4]University of Gottingen, Gottingen, Germany.;
[5]Beijing Forestry University, Beijing, China.;
[6]Department of Forestry and Wood Technology, University of Steltenbosch, Stetlenbosch, South Africa.;