Scientia Silvae Sinicae ›› 2020, Vol. 56 ›› Issue (9): 184-192.doi: 10.11707/j.1001-7488.20200920
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Song Hu1,Guangyu Zhu1,3,*,Zhenxiong Chen2,Kan Lu1,Lang Huang1,Zhuo Liu1
Received:
2018-06-07
Online:
2020-09-25
Published:
2020-10-15
Contact:
Guangyu Zhu
CLC Number:
Song Hu,Guangyu Zhu,Zhenxiong Chen,Kan Lu,Lang Huang,Zhuo Liu. Basal Area Growth Model for Oaks Natural Secondary Forest in Hunan Province Based on Storey Identification[J]. Scientia Silvae Sinicae, 2020, 56(9): 184-192.
Table 1
Summary statistics for modeling and validation data sets of whole stand"
变量 Variable | 建模数据Modelling data | 检验数据Validation data | |||||||
最小值 Min. | 最大值 Max. | 平均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. | 平均值 Mean | 标准差 SD | ||
G/(m2·hm-2) | 14.4 | 59.4 | 30.1 | 10.7 | 14.6 | 47.7 | 30.3 | 10.4 | |
N/(tree·hm-2) | 722.0 | 4 118.0 | 1 518.2 | 810.7 | 961.5 | 3 913.8 | 1 556.3 | 841.3 | |
Dg/cm | 9.1 | 26.6 | 16.7 | 3.9 | 9.6 | 21.4 | 16.4 | 3.7 | |
H/cm | 9.2 | 23.2 | 13.7 | 2.7 | 10.5 | 17.3 | 12.8 | 1.8 | |
V/m3 | 69.9 | 368.0 | 179.7 | 52.4 | 80.1 | 362.8 | 182.3 | 58.4 | |
P | 0.63 | 0.90 | 0.79 | 0.06 | 0.7 | 0.88 | 0.78 | 0.06 | |
HT/m | 11.1 | 27.5 | 16.4 | 3.2 | 13.1 | 20.5 | 15.2 | 2.1 | |
T/a | 18 | 72 | 38 | 14.0 | 21 | 56 | 35.7 | 11.8 |
Table 2
Evaluation index statistics for main storey and second storey in different methods"
划分方法 Division method | 变量 Variable | 主林层Main storey | 次林层Second storey | |||||||
最小值 Min. | 最大值 Max. | 平均值 Mean | 标准差 SD | 最小值 Min. | 最大值 Max. | 平均值 Mean | 标准差 SD | |||
全树高聚类法 Whole tree height clustering | Dg/cm | 10.2 | 69.1 | 22.8 | 9.3 | 5.7 | 19.7 | 11.6 | 2.9 | |
H/cm | 10.5 | 27.5 | 15.3 | 3.1 | 6.5 | 12.9 | 9.3 | 1.4 | ||
V/m3 | 51.5 | 271.6 | 150.1 | 57.3 | 30.5 | 107.1 | 48.9 | 19.4 | ||
P | 0.21 | 0.76 | 0.47 | 0.14 | 0.20 | 0.74 | 0.32 | 0.14 | ||
国际林联标准 IUFRO standard | Dg/cm | 9.9 | 58.6 | 23.2 | 8.9 | 5.5 | 20.3 | 11.8 | 2.9 | |
H/cm | 10.7 | 33.3 | 16.7 | 4.7 | 6.9 | 19.7 | 10.2 | 2.3 | ||
V/m3 | 47.4 | 280.4 | 140.3 | 56.1 | 32.0 | 139.3 | 58.3 | 26.5 | ||
P | 0.29 | 0.75 | 0.45 | 0.15 | 0.20 | 0.78 | 0.34 | 0.15 | ||
光竞争高度法 TRSRAT | Dg/cm | 10.6 | 69.1 | 22.9 | 9.5 | 5.8 | 20.3 | 11.9 | 3.2 | |
H/cm | 11.1 | 29.7 | 16.3 | 3.9 | 6.9 | 14.7 | 9.8 | 1.8 | ||
V/m3 | 38.9 | 279.0 | 140.3 | 57.2 | 35.2 | 132.5 | 56.2 | 26.8 | ||
P | 0.23 | 0.75 | 0.46 | 0.16 | 0.21 | 0.70 | 0.33 | 0.15 |
Table 3
Results of storey division in different methods"
划分方法 Division method | 蓄积 Volume/(m3·hm-2) | 平均胸径 Mean DBH/cm | 平均高 Average height/m | 郁闭度 Crown density | ||||||||||||
上层林 Upper layer | 下层林 Lower layer | F | 上层林 Upper layer | 下层林 Lower layer | F | 上层林 Upper layer | 下层林 Lower layer | F | 高差/% Relative elevation | 上层林 Upper layer | 下层林 Lower layer | F | ||||
全树高聚类法 Whole tree height clustering | 161.3±83.5 | 43.0±12.9 | ** | 22.8±9.3 | 11.6±2.9 | ** | 15.3±3.1 | 9.3±1.4 | ** | 40.0±7.5 | 0.41±0.17 | 0.38±0.17 | ** | |||
国际林联标准 IUFRO standard | 146.6±81.6 | 57.2±24.9 | ** | 24.1±8.9 | 12.2±3.2 | ** | 15.8±3.2 | 9.8±1.5 | ** | 37.0±8.0 | 0.42±0.16 | 0.37±0.16 | ** | |||
光竞争高度法 TRSRAT | 146.1±88.2 | 57.3±25.4 | ** | 23.6±9.3 | 12.1±3.2 | ** | 15.6±3.0 | 9.7±1.7 | ** | 37.0±8.2 | 0.47±0.14 | 0.32±0.14 | ** |
Table 4
Simulation results of basal area model for whole stand, upper layer and lower layer"
划分方法 Division method | 模型类型 Model type | 参数估计 Parameter estimates | 建模精度 Modeling accuracy | 检验结果 Validation result | ||||||||||
b0 | b1 | b2 | b3 | b4 | b5 | R2 | MAE | RMSE | MAE | RMSE | ||||
不分层 No stratification | 全林分 Whole stand | 2.814 4 | -47.004 2 | 1.203 0 | -6.553 2 | -0.238 6 | 17.976 3 | 0.925 9 | 2.337 5 | 2.953 3 | 2.769 4 | 2.996 4 | ||
全树高聚类法 Whole tree height clustering | 上层林 Upper layer | -0.234 5 | 106.498 9 | 1.057 3 | 4.979 3 | 0.954 3 | -42.116 7 | 0.964 5 | 1.309 3 | 1.706 3 | 0.434 5 | 0.536 1 | ||
下层林 Lower layer | 3.571 4 | -68.343 1 | 1.426 3 | -7.654 3 | -0.511 1 | 24.996 1 | 0.945 5 | 1.724 5 | 2.175 0 | 1.501 0 | 2.414 1 | |||
国际林联标准 IUFRO standard | 上层林 Upper layer | 1.991 4 | -11.884 2 | 1.274 5 | -11.917 3 | 0.142 8 | 4.538 5 | 0.974 6 | 1.021 7 | 1.308 9 | 1.211 5 | 1.403 1 | ||
下层林 Lower layer | 3.300 7 | -42.158 9 | 1.087 7 | -0.717 6 | -0.376 5 | 14.003 5 | 0.980 2 | 0.599 7 | 0.862 3 | 0.376 1 | 0.499 3 | |||
光竞争高度法 TRSRAT | 上层林 Upper layer | 1.124 8 | 31.098 1 | 1.017 4 | -3.502 3 | 0.524 4 | -13.767 4 | 0.967 8 | 1.265 9 | 1.630 8 | 1.026 9 | 1.196 2 | ||
下层林 Lower layer | 3.928 0 | -57.403 8 | 1.058 4 | -0.780 6 | -0.601 6 | 19.575 6 | 0.984 6 | 0.593 3 | 0.761 4 | 0.648 4 | 0.908 4 |
Table 5
Basal area growth model accuracy comparison with four modelling methods"
划分方法Division method | 样本量Sample capacity | R2 | MAE | RMSE |
不分层No stratification | 51 | 0.924 2 | 2.422 2 | 2.961 8 |
全树高聚类法Whole tree height clustering | 51 | 0.943 0 | 1.887 3 | 2.568 8 |
国际林联标准IUFRO standard | 51 | 0.959 0 | 1.458 8 | 2.178 6 |
光竞争高度法TRSRAT | 51 | 0.947 5 | 1.694 2 | 2.464 6 |
Table 6
Simulation results of storey basal area compatible model"
模型类型 Model type | 建模精度Modeling accuracy | 检验结果Validation result | ||||
R2 | MAE | RMSE | MAE | RMSE | ||
全林分Whole stand | 0.925 9 | 2.337 5 | 2.953 3 | 2.769 4 | 2.996 4 | |
上层林Upper layer | 0.986 8 | 0.575 9 | 0.944 5 | 0.366 2 | 0.406 6 | |
下层林Lower layer | 0.988 8 | 0.481 1 | 0.648 3 | 0.386 2 | 0.424 6 |
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