Abstract:

Both normal growth and eccentric growth poplar clone 107 standing tree were selected for studying materials in this paper. Surface longitudinal growth strain was determined，and fiber morphological properties and shrinkage properties of wood sample beneath which strain determined area were measured also. Relationships between growth strain and selected wood properties were deduced，and the result shown： along with increasing of growth strain，fiber length，ratio of fiber length to width，tangential oven-dry shrinkage and longitudinal oven-dry shrinkage of normal growth tree decreasing slightly，however，fiber width，width of double cell wall，runkel ratio，radial oven-dry shrinkage increasing slightly. Correlations among growth strain and all selected wood properties were insignificant. Along with increasing of growth strain，width of double cell wall，ratio of fiber length to width，longitudinal oven-dry shrinkage，tangential oven-dry shrinkage，radial oven-dry shrinkage of eccentric growth tree decreasing sharply，however，fiber width，runkel ratio increasing sharply，and fiber length increasing slightly. Negative correlation coefficients between growth strain and width of double cell wall，ratio of fiber length to width，longitudinal oven-dry shrinkage，tangential oven-dry shrinkage，radial oven-dry shrinkage were significant，and positive correlation coefficients between growth strain and fiber width，runkel ratio were also significant. However，apparent correlation between growth strain and fiber length have not been found. When normal growth tree which did not contain tension wood was concerned，relationships between strain and fiber morphological properties and wood shrinkage properties were feeble. When it came to eccentric growth tree which contained tension wood，almost all relationships between strain and fiber morphological properties and wood shrinkage properties were tighter than normal growth tree owing to different properties of normal wood and tension wood.

Key words: poplar clone 107, growth strain, wood properties