Table 2 Correlation analysis between pressure and gas flux in poplar tension wood and opposite wood
Length | Air | Nitrogen | |||
|---|---|---|---|---|---|
(mm) | Regression equation | R 2 | Regression equation | R 2 | |
Tension wood | 4 | F = 0.679P + 3.2547 | 0.9811 | F = 4.3975P + 19.629 | 0.9972 |
6 | F = 0.5273P + 2.0239 | 0.9896 | F = 3.6503P + 16.282 | 0.9972 | |
8 | F = 0.3541P + 1.2386 | 0.9877 | F = 2.4575P + 9.1414 | 0.9991 | |
Opposite wood | 4 | F = 1.1706P + 4.3463 | 0.9980 | F = 7.9973P + 43.141 | 0.9918 |
6 | F = 0.9206P + 3.1862 | 0.9983 | F = 6.6818P + 28.634 | 0.9987 | |
8 | F = 0.6683P + 2.9646 | 0.9970 | F = 5.7286P + 21.722 | 0.9979 | |