Influence of Different Thinning Treatments on Stand Resistance to Snow and Wind in Loblolly Pine (Pinus taeda L.) Coastal Plantations of Northern Iran
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Data Collection
2.3. Data Analysis
3. Results
4. Discussion
5. Conclusions
- Amount and type of snow damage was different from wind damage.
- Amount of snow and wind damage decreased by increasing stand age.
- Thinning can reduce or increase snow and wind damage depending on the time of heavy snowfall and strong winds and the intensity of thinning.
- However, heavy thinning reduced the risk of snow damage, but it may increase the risk of wind damage.
- Young dense stands were more susceptible to snow damage, while old stands were more susceptible to wind damage.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Stand | Age (Year) | Plantation Area (ha) | Age at Thinning (year) | Thinning Intensity (%) of Basal Area | No. of Plot | Total Plot Area (ha) | Sampling Intensity (%) |
---|---|---|---|---|---|---|---|
NYU1 | 17 | 3.1 | - | - | 5 | 0.3125 | 10.1 |
NYU2 | 17 | 2.4 | - | - | 4 | 0.25 | 10.4 |
NYU3 | 17 | 2.1 | - | - | 3 | 0.1875 | 8.9 |
NYN1 | 15 | 2.0 | 7 | 15 | 3 | 0.1875 | 9.4 |
NYN2 | 15 | 2.0 | 7 | 15 | 3 | 0.1875 | 9.4 |
NYN3 | 15 | 2.1 | 7 | 15 | 3 | 0.1875 | 8.9 |
NYH1 | 16 | 2.2 | 7 | 35 | 3 | 0.1875 | 8.5 |
NYH2 | 16 | 2.1 | 7 | 35 | 2 | 0.125 | 6.0 |
NYH3 | 16 | 2.0 | 7 | 35 | 2 | 0.125 | 6.3 |
PMU1 | 34 | 4.8 | - | - | 7 | 0.4375 | 9.1 |
PMU2 | 34 | 5.2 | - | - | 8 | 0.5 | 9.6 |
PMU3 | 34 | 6.2 | - | - | 10 | 0.625 | 10.1 |
PMN1 | 32 | 4.2 | 17 | 15 | 6 | 0.375 | 8.9 |
PMN2 | 32 | 4.2 | 17 | 15 | 6 | 0.375 | 8.9 |
PMN3 | 32 | 4.3 | 17 | 15 | 7 | 0.4375 | 10.2 |
PMH1 | 30 | 3.3 | 17 | 35 | 5 | 0.3125 | 9.5 |
PMH2 | 30 | 3.0 | 17 | 35 | 5 | 0.3125 | 10.4 |
PMH3 | 30 | 3.4 | 17 | 35 | 5 | 0.3125 | 9.2 |
POU1 | 48 | 2.1 | - | - | 3 | 0.1875 | 8.9 |
POU2 | 48 | 2.6 | - | - | 4 | 0.25 | 9.6 |
POU3 | 48 | 2.1 | - | - | 3 | 0.1875 | 8.9 |
PON1 | 52 | 3.1 | 33 | 15 | 5 | 0.3125 | 10.1 |
PON2 | 52 | 2.6 | 33 | 15 | 4 | 0.25 | 9.6 |
PON3 | 52 | 3.1 | 33 | 15 | 5 | 0.3125 | 10.1 |
POH1 | 50 | 4.2 | 33 | 35 | 6 | 0.375 | 8.9 |
POH2 | 50 | 4.2 | 33 | 35 | 6 | 0.375 | 8.9 |
POH3 | 50 | 4.4 | 33 | 35 | 7 | 0.4375 | 9.9 |
Total | - | 87.0 | 130 | - | |||
Average | - | - | - | - | - | 9.3 |
Stand | Average DBH (cm) | Average Tree Height (m) | Density (Stem ha−1) | Basal Area (m2 ha−1) | Stand Volume (m3 ha−1) |
---|---|---|---|---|---|
NYU | 11.7 ± 2.1b | 13.1 ± 2.2c | 1832 ± 21a | 19.58 ± 2.11b | 168.0 ± 15.8c |
NYN | 13.4 ± 1.7ab | 12.0 ± 2.0c | 1536 ± 20b | 21.60 ± 1.95ab | 196.3 ± 17.0b |
NYH | 15.4 ± 2.0a | 12.3 ± 2.1c | 1329 ± 23c | 24.85 ± 2.14a | 223.5 ± 24.4a |
F-value | 8.95 ** | 1.57 ns | 29.08 ** | 10.62 ** | 39.50 ** |
PMU | 23.0 ± 1.6c | 19.3 ± 2.5b | 551 ± 19a | 22.84 ± 1.06c | 301.5 ± 26.2c |
PMN | 28.3 ± 1.7b | 19.9 ± 2.4b | 488 ± 14b | 28.15 ± 1.80b | 339.1 ± 25.8b |
PMH | 34.9 ± 3.1a | 20.1 ± 2.6b | 387 ± 18c | 37.02 ± 2.30a | 433.0 ± 30.8a |
F-value | 41.50 ** | 1.45 ns | 37.24 ** | 21.68 ** | 62.60 ** |
POU | 36.7 ± 2.8c | 28.3 ± 2.7a | 515 ± 15a | 54.39 ± 3.17c | 1044.2 ± 42.6c |
PON | 42.0 ± 2.8b | 28.1 ± 1.9a | 429 ± 13b | 59.47 ± 3.01b | 1113.4 ± 50.4b |
POH | 48.4 ± 2.5a | 28.3 ± 1.5a | 357±15c | 65.42 ± 3.44a | 1223.0 ± 50.6a |
F-value | 25.47 ** | 1.28 ns N.S. | 18.47 ** | 27.40 ** | 35.61 ** |
Cause of Damage | Young Stand (Naturally Regenerated) | Middle-Aged Stand (Planted) | Old Stand (Planted) | |||
---|---|---|---|---|---|---|
Den DF | F-Value | Den DF | F-Value | Den DF | F-Value | |
Snow | 2 | 21.138 | 2 | 15.305 | 2 | 11.704 |
Wind | 2 | 25.070 | 2 | 46.245 | 2 | 27.320 |
Total damage | 2 | 32.560 | 2 | 30.491 | 2 | 17.844 |
Stand | Damage by Snow (%) | Damage by Wind (%) | t-Value | p-Value |
NYU | 21.4 ± 3.4 | 9.3 ± 0.9 | 10.324 | 0.0001 |
NYN | 11.8 ± 1.5 | 3.6 ± 0.6 | 14.802 | 0.0001 |
NYH | 5.0 ± 0.9 | 0.4 ± 0.1 | 15.707 | <0.0001 |
PMU | 8.2 ± 1.1 | 5.3 ± 0.6 | 8.060 | 0.0013 |
PMN | 6.6 ± 1.0 | 0 | - | - |
PMH | 9.1 ± 1.4 | 2.1 ± 0.4 | 16.142 | <0.0001 |
POU | 4.8 ± 0.6 | 2.2 ± 0.4 | 11.347 | 0.0001 |
PON | 1.3 ± 0.2 | 0 | - | - |
POH | 1.8 ± 0.3 | 0 | - | - |
All stands | 7.8 ± 3.1 | 2.5 ± 1.3 | 6.659 | 0.00 |
Stand | Tree Uprooted | Stem Breakage | Branch Breakage | Tree Bent | Overall Damage | Undamaged |
---|---|---|---|---|---|---|
Stem Slenderness Coefficient (H/D) | ||||||
NYU | 119.4 ± 6.0a | 115.6 ± 7.0ab | 110.6 ± 9.2b | 119.3 ± 7.5a | 118.2 ± 9.0a | 110.0 ± 9.2b |
NYN | 115.0 ± 9.8a | 110.6 ± 6.8ab | 108.5 ± 7.7b | 113.4 ± 9.2a | 113.1 ± 7.2a | 92.0 ± 7.4c |
NYH | 114.7 ± 9.0a | 114.3 ± 5.9a | 103.4 ± 5.4b | 110.5 ± 6.0a | 106.0 ± 7.4b | 83.4 ± 7.2c |
PMU | 98.3 ± 3.3b | 96.5 ± 3.7b | 89.5 ± 6.3c | 102.0 ± 4.5a | 96.5 ± 4.1b | 86.6 ± 5.3c |
PMN | - | 92.3 ± 7.1a | 88.5 ± 6.6a | 88.0 ± 6.2a | 89.3 ± 6.3a | 73.3 ± 6.5b |
PMH | 85.2 ± 4.7ab | 88.1 ± 5.2a | 80.7 ± 5.4b | 84.8 ± 9.2ab | 84.5 ± 6.0ab | 56.2 ± 4.5c |
POU | 88.2 ± 6.9a | 85.4 ± 3.7a | 79.6 ± 6.3b | - | 81.5 ± 7.1b | 70.3 ± 6.4c |
PON | - | - | 70.3 ± 6.4a | - | 70.3 ± 6.4a | 68.2 ± 5.5b |
POH | - | - | 76.3 ± 5.5a | - | 76.3 ± 5.5a | 64.9 ± 7.3b |
Relative Crown Wide (CD/CL) | ||||||
NYU | 0.39 ± 0.08a | 0.38 ± 0.07a | 0.39 ± 0.07a | 0.35 ± 0.05a | 0.33 ± 0.05a | 0.26 ± 0.04b |
NYN | 0.38 ± 0.05a | 0.37 ± 0.06a | 0.38 ± 0.10a | 0.39 ± 0.07a | 0.39 ± 0.05a | 0.29 ± 0.05b |
NYH | 0.41 ± 0.07a | 0.40 ± 0.07a | 0.39 ± 0.05a | 0.38 ± 0.04a | 0.39 ± 0.03a | 0.33 ± 0.05b |
PMU | 0.50 ± 0.08a | 0.52 ± 0.05a | 0.55 ± 0.06a | 0.51 ± 0.10a | 0.54 ± 0.06a | 0.35 ± 0.10a |
PMN | 0.50 ± 0.05a | 0.52 ± 0.08a | 0.55 ± 0.07a | 0.53 ± 0.05a | 0.53 ± 0.06a | 0.42 ± 0.08a |
PMH | 0.49 ± 0.07a | 0.50 ± 0.08a | 0.53 ± 0.09a | 0.49 ± 0.06a | 0.50 ± 0.07a | 0.44 ± 0.06a |
POU | 0.51 ± 0.04a | 0.53 ± 0.05a | 0.52 ± 0.04a | - | 0.53 ± 0.06a | 0.33 ± 0.05b |
PON | - | - | 0.62 ± 0.08a | - | 0.62 ± 0.08a | 0.45 ± 0.05b |
POH | - | - | 0.73 ± 0.07a | - | 0.73 ± 0.07a | 0.51 ± 0.08b |
Relative Crown Length (CL/H) | ||||||
NYU | 0.24 ± 0.05a | 0.24 ± 0.04a | 0.27 ± 0.05a | 0.25 ± 0.04a | 0.25 ± 0.05a | 0.15 ± 0.04b |
NYN | 0.30 ± 0.05a | 0.26 ± 0.07a | 0.31 ± 0.07a | 0.29 ± 0.07a | 0.29 ± 0.07a | 0.18 ± 0.03b |
NYH | 0.30 ± 0.07a | 0.34 ± 0.056a | 0.29 ± 0.07a | 0.32 ± 0.07a | 0.32 ± 0.07a | 0.22 ± 0.05b |
PMU | 0.34 ± 0.08a | 0.27 ± 0.07a | 0.35 ± 0.09a | 0.32 ± 0.07a | 0.32 ± 0.08a | 0.17 ± 0.07b |
PMN | 0.30 ± 0.09a | 0.30 ± 0.09a | 0.29 ± 0.09a | 0.30 ± 0.08a | 0.30 ± 0.07a | 0.20 ± 0.08b |
PMH | 0.31 ± 0.09a | 0.32 ± 0.06a | 0.34 ± 0.08a | 0.32 ± 0.09a | 0.32 ± 0.08a | 0.25 ± 0.09b |
POU | 0.29 ± 0.07a | 0.26 ± 0.07a | 0.28 ± 0.07a | 0.26 ± 0.06a | 0.28 ± 0.09a | 0.19 ± 0.07b |
PON | - | - | 0.33 ± 0.09a | - | 0.33 ± 0.09a | 0.22 ± 0.06b |
POH | - | - | 0.32 ± 0.09a | - | 0.32 ± 0.09a | 0.24 ± 0.05b |
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Picchio, R.; Tavankar, F.; Latterini, F.; Jourgholami, M.; Karamdost Marian, B.; Venanzi, R. Influence of Different Thinning Treatments on Stand Resistance to Snow and Wind in Loblolly Pine (Pinus taeda L.) Coastal Plantations of Northern Iran. Forests 2020, 11, 1034. https://doi.org/10.3390/f11101034
Picchio R, Tavankar F, Latterini F, Jourgholami M, Karamdost Marian B, Venanzi R. Influence of Different Thinning Treatments on Stand Resistance to Snow and Wind in Loblolly Pine (Pinus taeda L.) Coastal Plantations of Northern Iran. Forests. 2020; 11(10):1034. https://doi.org/10.3390/f11101034
Chicago/Turabian StylePicchio, Rodolfo, Farzam Tavankar, Francesco Latterini, Meghdad Jourgholami, Behroz Karamdost Marian, and Rachele Venanzi. 2020. "Influence of Different Thinning Treatments on Stand Resistance to Snow and Wind in Loblolly Pine (Pinus taeda L.) Coastal Plantations of Northern Iran" Forests 11, no. 10: 1034. https://doi.org/10.3390/f11101034