《Table 2 CSPGs at different stems heights of P.deltoides clones》

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《Compressive Strength Parallel to Grain Variation of Different Clones of Populus deltoides Marsh》

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*indicates the significant difference（P<0.05）.

Based on the determination of CSPGs of P.deltoides clones at different stem heights，the variation of CSPGs at different stem heights were analyzed.As shown in Table 2，the CSPGs of the 5P.deltoides clones changed with the increase of stem heights.The CSPGs of the clones varied from 29.14 to 52.69 MPa among the clones，and the variation coefficients of the stem heights among the clones ranged from 6.79 to 18%.Clone 80 had the largest coefficient of variation of 18%，followed by clone 58，which also had the coefficient of variation reached 16.11%，indicating that there was a large variation in the CSPGs of the two clones with the stem heights.The results of variance analysis（Table 2）showed that there were significant differences in CSPG of the P.deltoides clones at different stem heights，suggesting that the pressure intensities were different at different stem heights of the P.deltoides clones.Therefore，it should make selective use of the wood from different stem heights when used as the engineering structural materials，so as to make the best of the materials.