The Influence of Pruning on the Growth and Wood Properties of Populus deltoides “Nanlin 3804”
Abstract
1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Pruning Method
2.3. Selection and Initial Processing of Test Wood
2.4. Sample Preparation
2.5. Physical and Mechanical Testing
2.5.1. Calculation of Tree Volume
2.5.2. Measurement of Fiber Morphology
2.5.3. Testing Methodology
2.6. Data Processing
3. Results
3.1. Effects of Pruning on Poplar Tree Growth
3.1.1. Effects on Diameter at Breast Height (DBH) and Tree Height
3.1.2. Effects on Annual Ring Width at Different Tree Heights
3.2. Effects of Pruning on Wood Fiber Aspect Ratio
3.3. The Effect of Pruning on the Physical Properties of Poplar Wood
3.4. The Effect of Pruning on the Mechanical Properties of Poplar Wood
3.4.1. The Impact on the Bending Strength
3.4.2. Effect of Pruning on Impact Toughness
3.4.3. The Effect of Pruning on Wood Compression Parallel to the Grain
4. Discussions
4.1. Effects of Pruning on Poplar Growth
4.2. Effects of Pruning on Poplar Fiber Morphology
4.3. Effects of Pruning on Poplar Physical Properties
4.4. Effects of Pruning on Poplar Mechanical Properties
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Treatment | Soil Layer | Bulk Density (g·cm−3) | Porosity | Organic Matter (g·kg−1) | Total Nitrogen (g·kg−1) | Total Phosphorus (g·kg−1) | Total Potassium (g·kg−1) |
---|---|---|---|---|---|---|---|
CK | 0–20 cm | 1.27 ± 0.05 | 0.52 ± 0.02 | 24.25 ± 2.67 | 0.83 ± 0.18 | 0.81 ± 0.06 | 15.96 ± 0.99 |
P | 0–20 cm | 1.22 ± 0.25 | 0.54 ± 0.08 | 28.88 ± 2.54 | 0.91 ± 0.25 | 0.80 ± 0.09 | 16.60 ± 0.27 |
Treatment | DBH (cm) | Tree Height (m) | Height of Lower Branches (m) | Single Tree Volume (m3) | |
---|---|---|---|---|---|
Before pruning | CK | 20.87 ± 1.30 | 17.11 ± 0.67 | 2.36 ± 0.28 | 0.24 ± 0.02 |
P | 21.53 ± 1.17 | 16.82 ± 0.84 | 2.55 ± 0.29 | 0.25 ± 0.03 | |
After pruning | CK | 20.87 ± 1.30 | 17.11 ± 0.67 | 2.36 ± 0.28 | 0.24 ± 0.01 |
P | 21.53 ± 1.17 | 16.82 ± 0.84 | 5.68 ± 0.50 | 0.25 ± 0.02 |
Treatment | DBH (cm) | Tree Height (m) | Height of Lower Branches (m) | Volume per Tree (m3) |
---|---|---|---|---|
CK | 36.55 ± 0.73 a | 29.40 ± 1.50 a | 2.80 ± 1.22 b | 1.13 ± 0.02 a |
P | 36.53 ± 0.68 a | 29.23 ± 2.10 a | 7.50 ± 1.13 a | 1.11 ± 0.06 a |
Wood Sample | Air-dried Density (g·cm−3) | Basic Density (g·cm−3) | Oven-dried Density (g·cm−3) | Volumetric Oven-dried Shrinkage (%) |
---|---|---|---|---|
With knots | 0.62 ± 0.09 a | 0.50 ± 0.02 a | 0.57 ± 0.03 a | 11.80 ± 0.02 a |
Clear | 0.48 ± 0.02 b | 0.39 ± 0.01 b | 0.44 ± 0.02 b | 11.23 ± 0.03 b |
Wood Sample | MOR (MPa) | MOE (GPa) | Compression Parallel to Grain (MPa) | Impact Toughness (KJ/m2) |
---|---|---|---|---|
Dead knots | 54.51 ± 3.74 b | 5.46 ± 0.41 b | 17.03 ± 0.65 c | 43.71 ± 4.64 c |
Sound knots | 67.81 ± 2.36 a | 6.82 ± 0.34 a | 22.31 ± 0.87 b | 126.56 ± 3.12 a |
Clear | 71.48 ± 2.01 a | 7.47 ± 0.45 a | 27.19 ± 0.92 a | 85.31 ± 4.55 b |
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Leng, W.; Cao, P.; Chen, C.; Tang, L. The Influence of Pruning on the Growth and Wood Properties of Populus deltoides “Nanlin 3804”. Forests 2025, 16, 848. https://doi.org/10.3390/f16050848
Leng W, Cao P, Chen C, Tang L. The Influence of Pruning on the Growth and Wood Properties of Populus deltoides “Nanlin 3804”. Forests. 2025; 16(5):848. https://doi.org/10.3390/f16050848
Chicago/Turabian StyleLeng, Weiqi, Pei Cao, Chao Chen, and Luozhong Tang. 2025. "The Influence of Pruning on the Growth and Wood Properties of Populus deltoides “Nanlin 3804”" Forests 16, no. 5: 848. https://doi.org/10.3390/f16050848
APA StyleLeng, W., Cao, P., Chen, C., & Tang, L. (2025). The Influence of Pruning on the Growth and Wood Properties of Populus deltoides “Nanlin 3804”. Forests, 16(5), 848. https://doi.org/10.3390/f16050848