Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (5): 81-87.doi: 10.11707/j.1001-7488.LYKX20220379
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Lulu Wang,Youfu Zhang*,Yibo Chen,Chunyan Chen,Chenhui Song
Received:
2022-06-07
Online:
2023-05-25
Published:
2023-08-02
Contact:
Youfu Zhang
CLC Number:
Lulu Wang,Youfu Zhang,Yibo Chen,Chunyan Chen,Chenhui Song. Leaf Characteristics and Leaf Area Estimation Model of the Spiny Leaf in Juniperus chinensis cv. Pyramidalis[J]. Scientia Silvae Sinicae, 2023, 59(5): 81-87.
Table 1
Overall distribution characteristics of leaf morphological index for spiny leaves of J. chinensis"
统计量Statistics | 指标Measurements | ||||
LA/mm2 | LL/mm | LWmax/mm | LBW/mm | LT/mm | |
样本量Sample size | 1 270 | 1 270 | 1 270 | 1 270 | 1 270 |
平均数Mean | 7.433 | 9.004 | 1.014 | 0.780 | 0.385 |
平均数的标准误差 SE of mean | 0.063 | 0.052 | 0.006 | 0.004 | 0.002 |
标准偏差 Standard deviation | 2.235 | 1.907 | 0.209 | 0.126 | 0.061 |
均值的95%置信 区间上限 Upper 95% CI of mean | 7.556 | 9.110 | 1.026 | 0.788 | 0.388 |
均值的95%置信 区间下限 Lower 95% CI of mean | 7.307 | 8.898 | 1.003 | 0.774 | 0.382 |
最小值Minimum | 1.192 | 2.550 | 0.500 | 0.400 | 0.200 |
最大值Maximum | 14.124 | 12.700 | 1.600 | 1.200 | 0.600 |
变异系数 Coefficient of variation | 0.301 | 0.212 | 0.206 | 0.162 | 0.158 |
偏度 Skewness | ?0.629 | ?1.027 | 0.041 | 0.078 | 0.096 |
峰度Kurtosis | ?0.090 | 0.431 | ?0.160 | 0.092 | ?0.207 |
平均绝对误差 Mean absolute deviation | 1.787 | 1.510 | 0.164 | 0.098 | 0.050 |
Table 3
Multivariate linear regression of leaves morphological indexes in J. chinensis"
方法 Methods | 模型 Model | 自变量Xi Independent Variable Xi | 系数 Coefficient | 标准误差 Standard Error | 显著性 Significance | 共线性诊断 VIF | 95%置信区间 95% Confidence Interval | |
下限 Lower | 上限 Upper | |||||||
全入 Complete substitution method | i=1 | (常量Constant) | ?3.755 | 0.170 | <0.001 | ?4.088 | ?3.423 | |
R2=0.914 | LL | 0.720 | 0.012 | <0.001 | 1.330 | 0.695 | 0.745 | |
RMSE =0.666 | LWmax | 5.780 | 0.140 | <0.001 | 1.964 | 5.506 | 6.055 | |
AIC=2 059.602 | LBW | ?1.104 | 0.204 | <0.001 | 1.353 | ?1.540 | ?0.704 | |
LT | ?0.800 | 0.439 | 0.069 | 1.576 | ?1.662 | 0.062 | ||
逐步 Stepwise method | i=2 | (常量Constant) | ?1.686 | 0.175 | <0.001 | ?2.030 | ?1.342 | |
R2=0.725 | LL | 1.003 | 0.019 | <0.001 | 1.000 | 0.965 | 1.041 | |
RMSE =1.191 | ||||||||
AIC=3 238.133 | ||||||||
i=3 | (常量Constant) | ?4.497 | 0.117 | <0.001 | ?4.726 | ?4.267 | ||
R2=0.911 | LL | 0.725 | 0.013 | <0.001 | 1.302 | 0.700 | 0.749 | |
RMSE =0.678 | LWmax | 5.331 | 0.116 | <0.001 | 1.302 | 5.104 | 5.558 | |
AIC =2 492.517 | ||||||||
i=4 | (常量Constant) | ?3.879 | 0.156 | <0.001 | ?4.184 | ?3.573 | ||
R2=0.914 | LL | 0.718 | 0.012 | <0.001 | 1.314 | 0.693 | 0.742 | |
RMSE =0.667 | LWmax | 5.679 | 0.128 | <0.001 | 1.653 | 5.427 | 5.931 | |
AIC=2 060.969 | LBW | ?1.177 | 0.200 | <0.001 | 1.300 | ?1.569 | ?0.785 |
Table 4
Leaf area index model of the spiny leaves in J. chinensis"
模型 Model | 自变量Xi Independent Variable Xi | 参数Parameters | 统计量Statistics | ||||||
a | b | N | R2 | RMSE | AIC | P | |||
线性函数 Linear function | LL | 1.003 | ?1.686 | 1 016 | 0.725 | 1.191 | 3 238.133 | <0.001 | |
LWmax | 8.544 | ?1.270 | 1 016 | 0.620 | 1.400 | 3 567.673 | <0.001 | ||
LBW | 5.323 | 3.115 | 1 016 | 0.077 | 2.183 | 4 469.881 | <0.001 | ||
LT | 17.974 | 0.402 | 1 016 | 0.222 | 2.004 | 4 295.968 | <0.001 | ||
指数函数 Exponential function | LL | 1.366 | 0.180 | 1 016 | 0.776 | 0.187 | 3 401.459 | <0.001 | |
LWmax | 1.653 | 1.419 | 1 016 | 0.566 | 0.260 | 3 899.519 | <0.001 | ||
LBW | 3.198 | 0.973 | 1 016 | 0.086 | 0.378 | 4 519.311 | <0.001 | ||
LT | 2.109 | 3.081 | 1 016 | 0.216 | 0.350 | 4 379.768 | <0.001 | ||
幂函数 Power function | LL | 0.356 | 1.367 | 1 016 | 0.805 | 0.174 | 3 261.810 | <0.001 | |
LWmax | 7.060 | 1.427 | 1 016 | 0.630 | 0.242 | 3 691.125 | <0.001 | ||
LBW | 8.320 | 0.756 | 1 016 | 0.093 | 0.376 | 4 508.263 | <0.001 | ||
LT | 22.468 | 1.520 | 1 016 | 0.242 | 0.344 | 5 033.099 | <0.001 |
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