Measurement of Longitudinal Surface Growth Strains of Trees Using Strain Gauge and CIRAD-Foret Method Distribution Pattern of Growth Strain of Eccentric Growth Poplar107 Clone Tree (Populus ×euramericana cv.‘Neva’) Relationships between Growth Strain and Anatomical Characters and Shrinkage Properties in Poplar Clone 107(Populus×euramericana cv.‘Neva’) Tree Distribution Pattern of Growth Strain of Poplar 107 Clone Tree (Populus ×euramericana cv. Neva)