Research Article
A Prediction Model of Forest Preliminary Precision Fertilization Based on Improved GRA-PSO-BP Neural Network
Table 3
The biomass range (
) of a single Chinese fir and the percentage of its organs.
| Stand age (t/a) | Organ | Site index S = 5 | Site index S = 18 | Site index S = 21 | Site index S = 23 | W (kg) | Percentage (%) | W (kg) | Percentage (%) | W (kg) | Percentage (%) | W (kg) | Percentage (%) |
| 5a | Leaf | 1.67 ± 0.58 | 21.44 | 3.48 ± 0.95 | 24.34 | 3.98 ± 1.04 | 22.04 | 4.12 ± 1.39 | 18.7 | Branch | 1.25 ± 0.44 | 16.05 | 2.36 ± 0.84 | 16.50 | 2.78 ± 1.21 | 15.4 | 3.47 ± 1.32 | 15.7 | Stem | 2.60 ± 0.8 | 33.40 | 4.40 ± 1.08 | 30.77 | 5.64 ± 1.94 | 31.23 | 6.37 ± 2.51 | 33 | Bark | 0.53 ± 0.12 | 6.804 | 0.96 ± 0.33 | 6.71 | 1.46 ± 0.68 | 8.08 | 1.98 ± 0.83 | 9 | Root | 1.74 ± 0.66 | 22.33 | 3.10 ± 0.92 | 21.68 | 4.20 ± 1.46 | 23.25 | 5.24 ± 2.07 | 23.6 | Tree | 7.79 ± 2.6 | 100.00 | 14.30 ± 4.12 | 100.00 | 18.06 ± 6.33 | 100.00 | 22.04 ± 8.12 | 100.00 |
| 19a | Leaf | 2.64 ± 0.92 | 4.11 | 5.27 ± 1.47 | 5.04 | 5.98 ± 2.09 | 5.14 | 6.34 ± 2.87 | 4.83 | Branch | 4.43 ± 2.05 | 6.90 | 7.61 ± 2.44 | 7.28 | 8.22 ± 3.08 | 7.06 | 9.12 ± 4.43 | 7.00 | Stem | 40.36 ± 15.7 | 63.00 | 64.13 ± 20.6 | 61.34 | 72.33 ± 24.3 | 62.12 | 81.2 ± 29.7 | 62 | Bark | 6.78 ± 2.11 | 10.60 | 11.30 ± 4.87 | 10.84 | 13.11 ± 5.11 | 11.3 | 15.10 ± 7.05 | 12 | Root | 9.97 ± 3.01 | 16 | 16.20 ± 5.56 | 15.50 | 16.80 ± 6.76 | 14.38 | 19.40 ± 8.11 | 14.8 | Tree | 64.18 ± 23.79 | 100.00 | 104.51 ± 34.94 | 100.00 | 116.44 ± 41.34 | 100.00 | 131.16 ± 44.86 | 100.00 |
| 22a | Leaf | 4.22 ± 1.27 | 4.66 | 6.37 ± 2.02 | 4.89 | 6.89 ± 2.94 | 4.76 | 7.26 ± 3.16 | 4.53 | Branch | 5.11 ± 2.31 | 5.64 | 8.78 ± 3.11 | 6.74 | 9.89 ± 3.84 | 6.84 | 10.43 ± 4.38 | 6.50 | Stem | 56.7 ± 20.4 | 62.6 | 77.32 ± 26.21 | 59.36 | 87.34 ± 32.30 | 60.45 | 98.53 ± 41.1 | 61.4 | Bark | 9.12 ± 4.1 | 10.1 | 14.40 ± 5.98 | 11.1 | 15.21 ± 6.12 | 10.53 | 16.32 ± 7.14 | 10.2 | Root | 15.5 ± 6.52 | 17.1 | 23.40 ± 9.70 | 17.91 | 25.16 ± 11.6 | 17.41 | 27.89 ± 13.1 | 17.4 | Tree | 90.65 ± 34.6 | 100.00 | 130.27 ± 47.02 | 100.00 | 144.49 ± 56.8 | 100.00 | 160.43 ± 68.8 | 100.00 |
| 25a | Leaf | 5.64 ± 1.62 | 5.3 | 8.65 ± 2.61 | 5.70 | 9.16 ± 3.16 | 5.60 | 10.38 ± 4.21 | 5.73 | Branch | 6.10 ± 2.65 | 5.7 | 9.76 ± 3.46 | 6.43 | 10.78 ± 3.91 | 6.60 | 11.70 ± 4.61 | 6.50 | Stem | 63.2 ± 24.7 | 60 | 88.70 ± 28.70 | 58.5 | 96.80 ± 31.3 | 59.10 | 108.3 ± 35.9 | 59.8 | Bark | 11.7 ± 5.22 | 11 | 15.90 ± 6.21 | 10.5 | 16.80 ± 7.41 | 10.26 | 17.70 ± 8.01 | 9.8 | Root | 20.4 ± 7.59 | 19.1 | 28.70 ± 9.53 | 18.87 | 30.24 ± 11.2 | 18.5 | 33.12 ± 13.41 | 18.3 | Tree | 107.04 ± 41.78 | 100.00 | 151.71 ± 50.51 | 100.00 | 163.78 ± 56.98 | 100.00 | 181.2 ± 66.14 | 100.00 |
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