Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (3): 67-78.doi: 10.11707/j.1001-7488.20210307
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Xiaoyun Xia1,2,Yong Pang2,3,*,Qingfeng Huang1,Rong Wu4,Dongsheng Chen5,Yu Bai2,3
Received:
2019-03-01
Online:
2021-03-25
Published:
2021-04-07
Contact:
Yong Pang
CLC Number:
Xiaoyun Xia,Yong Pang,Qingfeng Huang,Rong Wu,Dongsheng Chen,Yu Bai. Prediction of Biomass Growth of Larix olgensis Based on 3-PG Model[J]. Scientia Silvae Sinicae, 2021, 57(3): 67-78.
Table 1
Summary of plot data"
龄组 | 样本数 | 海拔 | 胸径 | 密度 | 地上生物量 | 蓄积 |
Age group | Number | Elevation/m | DBH/cm | Density/(trees·hm-2) | Aboveground biomass /(t·hm-2) | Volume/(m3·hm-2) |
幼龄林Young | 22 | 242.85~319.41 | 10.90~11.40 | 1 005~2 283 | 43.00~94.17 | 57.96~149.80 |
中龄林Middle | 48 | 242.85~319.41 | 10.11~17.23 | 1 005~2 995 | 45.21~150.86 | 88.04~293.18 |
近熟林Near mature | 54 | 242.85~263.32 | 12.89~19.37 | 1 005~2 370 | 79.62~171.74 | 155.61~356.94 |
成熟林Mature | 57 | 242.85~272.76 | 15.85~26.06 | 500~1 940 | 90.79~173.11 | 144.06~336.19 |
Table 2
Meteorological data of Mengjiagang forest farm from 1981 to 2010"
月份 Month | 平均最高气温 Tmax/℃ | 平均最低气温 Tmin/℃ | 平均降雨量 PPT/mm | 霜冻天数 FD/d | 日平均辐射量 DAR/(MJ·m-2d-1) |
1 | -12.2 | -23.1 | 6.4 | 30 | 5.73 |
2 | -6.7 | -19.3 | 6.2 | 30 | 8.48 |
3 | 1.7 | -9.7 | 14.1 | 30 | 13.50 |
4 | 12.9 | 0.4 | 24.4 | 10.8 | 15.42 |
5 | 20.5 | 7.9 | 49.5 | 0 | 18.68 |
6 | 25.4 | 14.3 | 92.1 | 0 | 18.57 |
7 | 27.3 | 17.8 | 108.5 | 0 | 17.78 |
8 | 25.9 | 16.2 | 133.0 | 0 | 15.81 |
9 | 20.6 | 8.6 | 57.1 | 0 | 13.32 |
10 | 11.5 | 0.1 | 30.2 | 11.4 | 9.76 |
11 | -0.9 | -10.6 | 10.8 | 30 | 6.30 |
12 | -10.3 | -19.9 | 10.2 | 30 | 4.80 |
Table 3
Key parameters of 3-PG model of Larix olgensis"
类型Indicators | 参数Parameter | 值Value | 来源Source |
异速生长关系与分配 Allometric relationships and partitioning | 胸径2 cm时叶干生物量比 Foliage to stem biomass ratio at DBH = 2 cm | 0.5 | 拟合值Fitted |
胸径20 cm时叶干生物量分配比 Foliage: stem biomass ratio at DBH = 20 cm | 0.4 | 拟合值Fitted | |
干生物量与胸径关系中常数 Constant in the stem biomass v. DBH relationship | 0.096 3 | ||
干生物量与胸径关系中指数 Power in the stem biomass v. DBH relationship | 2.443 | ||
初级生物量分配到根的最大值 Maximum biomass fraction of NPP to roots | 0.4 | 拟合值Fitted | |
初级生物量分配到根的最小值 Minimum biomass fraction of NPP to roots | 0.2 | 拟合值Fitted | |
凋落物与根更新 Litterfall and root turnover | 最大凋落物速率 Maximum litterfall rate | 0.033 | 拟合值Fitted |
林龄为0时的凋落物速率 Litterfall rate at age = 0 | 0.001 | 默认值Default | |
凋落率中间值时的林龄 Age at which litterfall rate has median value | 24 | 拟合值Fitted | |
根的月平均凋落速率 Average monthly root turnover rate | 0.007 | 拟合值Fitted | |
树龄调节 Age modifier | 植物生长最大林龄 Maximum stand age used in age modifier | 100 | 拟合值Fitted |
计算林龄对于生长关系式中相对林龄的指数 Power of relative age in function for fage | 5 | 拟合值Fitted | |
林龄对生长影响等于0.5时的相对林龄 Relative age to give fage = 0.5 | 0.5 | 拟合值Fitted | |
树干死亡与自我疏伐 Stem mortality and self-thinning | 最大林龄的死亡率 Mortality rate for large age | 0.6 | 拟合值Fitted |
在1 000株·hm-2下每株树最大树干质量 Max. stem mass per tree @ 1 000 trees·hm-2 | 212 | 拟合值Fitted | |
自然稀疏法则指数Power in self-thinning rule | 1.5 | 默认值Default | |
达到郁闭度年龄Age at canopy cover | 19 | 拟合值Fitted | |
冠层电导 Conductance | 冠层量子效率Canopy quantum efficiency | 0.056 |
Table 4
Statistic of density experiment forest data and simulation values of 3-PG model"
统计量Statistic | 斜率Slope | 截距Intercept | R2 | ME | MAE | RMSE | MRE(%) |
胸径DBH/cm | 1.14 | -2.07 | 0.85 | 0.05 | 0.91 | 1.29 | 0.37 |
密度Density/(trees·hm-2) | 1.07 | -150.31 | 0.97 | 29.44 | 67.60 | 98.91 | 1.84 |
叶干生物量比Ratio of foliage to stem biomass | 1.87 | -0.03 | 0.67 | 0.01 | 0.01 | 0.02 | 20.84 |
根生物量Root biomass /(t·hm-2) | 0.73 | 7.92 | 0.64 | -1.85 | 3.16 | 4.17 | -7.70 |
干生物量Stem biomass /(t·hm-2) | 1.02 | -0.11 | 0.86 | -1.62 | 10.20 | 14.30 | -1.39 |
地上生物量AGB/(t·hm-2) | 0.99 | 3.26 | 0.86 | -2.44 | 10.54 | 14.85 | -2.00 |
总生物量Total biomass /(t·hm-2) | 0.95 | 10.95 | 0.84 | -4.29 | 12.55 | 17.97 | -2.94 |
蓄积Volume/(m3·hm-2) | 1.15 | 13.88 | 0.82 | -19.87 | 32.34 | 44.19 | -7.87 |
Table 5
Statistics of 24 plots data and simulation values of 3-PG model"
统计量Statistic | 斜率Slope | 截距Intercept | R2 | ME | MAE | RMSE | MRE(%) |
胸径DBH/cm | 1.05 | -1.76 | 0.96 | 1.02 | 1.13 | 1.33 | 6.48 |
密度Density/(trees·hm-2) | 0.93 | 187.50 | 0.89 | 88.01 | 104.66 | 185.34 | 6.07 |
叶干生物量比Ratio of foliage to stem biomass | 1.75 | -0.01 | 0.84 | 0.02 | 0.02 | 0.02 | 25.60 |
根生物量Root biomass/(t·hm-2) | 0.99 | 2.02 | 0.77 | -1.87 | 2.19 | 3.07 | -9.12 |
干生物量Stem biomass/(t·hm-2) | 1.19 | -31.03 | 0.84 | -10.69 | 16.17 | 19.10 | -9.89 |
地上生物量AGB/(t·hm-2) | 1.18 | -35.41 | 0.84 | -10.68 | 16.17 | 19.09 | -10.97 |
总生物量Total biomass/(t·hm-2) | 1.16 | -29.52 | 0.83 | -58.08 | 58.39 | 74.39 | -4.34 |
蓄积Volume/(m3·hm-2) | 0.95 | 48.06 | 0.90 | -88.71 | 88.71 | 104.91 | -9.09 |
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