Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (10): 49-58.doi: 10.11707/j.1001-7488.20211005
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Xiao He,Xiangdong Lei*
Received:
2020-09-18
Online:
2021-10-25
Published:
2021-12-11
Contact:
Xiangdong Lei
CLC Number:
Xiao He,Xiangdong Lei. Spatial Autoregressive Biomass Conversion and Expansion Factor Models for Larch Plantations in Northeast China[J]. Scientia Silvae Sinicae, 2021, 57(10): 49-58.
Table 1
Summary statistics of sample plot basic variables"
变量Variables | 平均值Mean | 最大值Max. | 最小值Min. | 变异系数CV(%) |
生物量转换与扩展因子Biomass conversion and expansion factors(BCEF)/(mg·m-3) | 0.77 | 0.81 | 0.74 | 1.70 |
林分蓄积Volume(V)/(m3·hm-2) | 85.22 | 299.32 | 4.23 | 63.75 |
林分平方平均直径Quadratic mean diameter(Dg)/cm | 12.40 | 26.40 | 5.70 | 33.66 |
林分断面积Basal area(BA)/(m2·hm-2) | 11.65 | 34.60 | 0.81 | 55.48 |
林分平均高Mean height(H)/m | 11.90 | 24.00 | 3.50 | 35.16 |
林分密度Density(N)/(tree·hm-2) | 1 020.00 | 3 600.00 | 250.00 | 56.00 |
林分平均年龄Mean age(Age)/a | 25.00 | 52.00 | 8.00 | 38.26 |
Table 3
Parameter estimates and model evaluation indicators based on least square"
模型形式 Model function | 序号 Number | 自变量 Independent variable | 参数Parameters | R2 | RMSE/(mg·m-3) | rRMSE(%) | |
a | b | ||||||
异速生长模型 Allometric model: lnBCEF= a+b×ln X+ε | 1 | V | -0.188*** | -0.016*** | 0.603 | 0.008 | 1.07 |
2 | Dg | -0.133*** | -0.050*** | 0.958 | 0.003 | 0.35 | |
3 | BA | -0.219*** | -0.017*** | 0.473 | 0.010 | 1.23 | |
4 | H | -0.165*** | -0.038*** | 0.710 | 0.007 | 0.91 | |
5 | N | -0.326*** | 0.010*** | 0.103 | 0.012 | 1.61 | |
6 | Age | -0.158*** | -0.032*** | 0.543 | 0.009 | 1.15 | |
指数模型 Exponential model: lnBCEF= a+b×X+ε | 7 | V | -0.237*** | -2.324E-4*** | 0.555 | 0.009 | 1.13 |
8 | Dg | -0.209*** | -3.872E-3*** | 0.907 | 0.004 | 0.52 | |
9 | BA | -0.237*** | -1.686E-3*** | 0.415 | 0.010 | 1.30 | |
10 | H | -0.216*** | -3.456E-3*** | 0.719 | 0.007 | 0.90 | |
11 | N | -0.267*** | 9.749E-6*** | 0.106 | 0.012 | 1.61 | |
12 | Age | -0.224*** | -1.303E-3*** | 0.524 | 0.009 | 1.17 | |
对数模型 Logarithmic model: BCEF= a+b×ln X+ε | 13 | V | 0.827*** | -0.013*** | 0.604 | 0.008 | 1.07 |
14 | Dg | 0.869*** | -0.039*** | 0.957 | 0.003 | 0.35 | |
15 | BA | 0.803*** | -0.013*** | 0.474 | 0.010 | 1.23 | |
16 | H | 0.844*** | -0.029*** | 0.712 | 0.007 | 0.91 | |
17 | N | 0.721*** | 0.008*** | 0.100 | 0.012 | 1.61 | |
18 | Age | 0.850*** | -0.024*** | 0.543 | 0.009 | 1.15 | |
双曲线模型 Hyperbolic model: BCEF= a+b/X+ε | 19 | V | 0.767*** | 0.298*** | 0.397 | 0.010 | 1.32 |
20 | Dg | 0.735*** | 0.431*** | 0.945 | 0.003 | 0.40 | |
21 | BA | 0.766*** | 0.056*** | 0.364 | 0.010 | 1.36 | |
22 | H | 0.749*** | 0.258*** | 0.632 | 0.008 | 1.03 | |
23 | N | 0.781*** | -5.360*** | 0.079 | 0.013 | 1.63 | |
24 | Age | 0.751*** | 0.474*** | 0.511 | 0.009 | 1.19 | |
S形曲线模型 S-shaped model: 1/BCEF= a+b×exp(- X) +ε | 25 | V | 1.293*** | -5.972*** | 0.031 | 0.013 | 1.67 |
26 | Dg | 1.298*** | -31.389*** | 0.414 | 0.010 | 1.30 | |
27 | BA | 1.296*** | -0.200*** | 0.204 | 0.012 | 1.52 | |
28 | H | 1.295*** | -3.274*** | 0.152 | 0.012 | 1.56 | |
29 | N | 1.293*** | -1.517E+7 | 0.004 | 0.013 | 1.69 | |
30 | Age | 1.294*** | -204.884* | 0.069 | 0.013 | 1.64 |
Table 4
Parameter estimates and model evaluation indicators based on SAR model with Dg as the predictor"
模型形式 Model function | 序号 Number | SAR模型 SAR model | 参数Parameters | 滞后参数 Lag parameter | R2 | RMSE/(mg·m-3) | rRMSE(%) | |
a | b | |||||||
异速生长模型 Allometric model | 31 | ESM | -0.133*** | -0.050*** | λ= -142.780*** | 0.980 | 0.002 | 0.24 |
32 | LSM | -0.204 | -0.050*** | ρ= -0.277 | 0.958 | 0.003 | 0.35 | |
对数模型 Logarithmic model | 33 | ESM | 0.870*** | -0.039*** | λ= -142.070*** | 0.980 | 0.002 | 0.24 |
34 | LSM | 1.097*** | -0.039*** | ρ= -0.293 | 0.957 | 0.003 | 0.35 | |
双曲线模型 Hyperbolic model | 35 | ESM | 0.737*** | 0.413*** | λ= -150.940*** | 0.976 | 0.002 | 0.26 |
36 | LSM | 1.199*** | 0.433*** | ρ= -0.599*** | 0.945 | 0.003 | 0.40 |
Table 5
Parameter estimates and model evaluation indicators based on multiple-variable SAR model with Dg, H and Age as predictors"
模型 Model | 序号 Number | SAR模型 SAR model | 参数Parameters | 滞后参数 Lag parameter | R2 | RMSE/(mg·m-3) | rRMSE(%) | |||
a | b | c | d | |||||||
BCEF= a+b/Dg+ c/H | 37 | SEM | 0.736*** | -0.436*** | -0.019*** | — | λ= -151.280*** | 0.978 | 0.002 | 0.26 |
38 | SLM | 1.220*** | 0.456*** | -0.020*** | — | ρ= -0.628** | 0.947 | 0.003 | 0.39 | |
BCEF= a+b/Dg + c/Age | 39 | SEM | 0.737*** | -0.419*** | -0.012 | — | λ= -150.620*** | 0.976 | 0.002 | 0.26 |
40 | SLM | 1.194*** | 0.438*** | -0.001 | — | ρ= -0.593 | 0.946 | 0.003 | 0.40 | |
BCEF= a+b/H+c/Age | 41 | SEM | 0.748*** | 0.112*** | 0.308*** | — | λ= -182.050*** | 0.907 | 0.004 | 0.52 |
42 | SLM | 0.342 | 0.187*** | 0.205*** | — | ρ= -0.523 | 0.682 | 0.007 | 0.96 | |
BCEF= a+b/Dg +c/ H+d/Age | 43 | SEM | 0.736*** | 0.437*** | -0.019*** | -0.004 | λ= -150.230*** | 0.977 | 0.002 | 0.26 |
44 | SLM | 1.219*** | 0.457*** | -0.020*** | -0.002 | ρ= -0.626** | 0.947 | 0.003 | 0.39 |
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