School of Landscape Architecture Northeast Forestry University Harbin 150040 P.R.China;
Harbin University Harbin 150086 P.R.China.;
School of Landscape Architecture Northeast Forestry University Harbin 150040 P.R.China;
School of Landscape Architecture Northeast Forestry University Harbin 150040 P.R.China;
School of Landscape Architecture Northeast Forestry University Harbin 150040 P.R.China;