Effects of different angles on the growth stress, wood density and wood shrinkage of the reaction wood.
In this paper,we select the 3-year-old pine seedlings and the 1-year-old poplar cuttings for plantation from artificial forest of Anhui Agricultural University(Both the number of poplars and pines are 60.There are 5 groups and 5 angles 0°,15°,30°,45°and 60°.Each group contains 12 and corresponds to a angle)to determinate the growth stress indicator,(GSI is called for short)wood density and wood shrinkage for researching.The results show that:(1)There is a significant positive correlation between the GSI absolute size of poplars and pines and the angle.(2)There is a significant positive correlation between the basic density of poplars and pines and the angle.(3)The relationship between the radial shrinkage rate of poplars and pines and the angle is not significant.There is a positive correlation between the axial shrinkage rate of poplars and pines and the angle.The correlation between the tangential shrinkage rate of poplars and the angle is positive,and the pine shows a negative correlation.(4)The poplar tangential shrinkage is larger in tension wood area than that in opposite wood area,and the change of poplar radial shrinkage is not much.Both the pine tangential shrinkage and radial shrinkage are less in compression wood area than that in opposite wood area.The axial shrinkage is much larger in reaction wood area than that in opposite wood area.