Bulletin of Botanical Research ›› 2024, Vol. 44 ›› Issue (6): 879-889.doi: 10.7525/j.issn.1673-5102.2024.06.009
• Physiology and Ecology • Previous Articles Next Articles
Yueqian LI1, Weiwei JIA1,2, Wancai ZHU1,3(), Yunfei DIAO1,4
Received:
2024-06-29
Online:
2024-11-20
Published:
2024-11-22
Contact:
Wancai ZHU
E-mail:zhuwancai@sina.com
CLC Number:
Yueqian LI, Weiwei JIA, Wancai ZHU, Yunfei DIAO. Spatial Structure and Regeneration Count Model of Taxus cuspidata Forests in Muling National Nature Reserve of Heilongjiang Province[J]. Bulletin of Botanical Research, 2024, 44(6): 879-889.
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URL: https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2024.06.009
Table 1
Information on the main tree species in the sample plot
树种 Tree species | 植株数量 Individuals number | 平均胸径 Mean diameter at breast height/cm | 最大胸径 Maximum diameter at breast height/cm | 蓄积 Stand volume/m3 |
---|---|---|---|---|
紫椴Tilia amurensis | 2 803 | 17.48 | 86.00 | 864.9 |
臭冷杉Abies nephrolepis | 2 254 | 14.67 | 44.60 | 362.2 |
色木槭Acer pictum | 2 534 | 11.88 | 71.50 | 328.9 |
东北红豆杉Taxus cuspidata | 163 | 39.50 | 89.00 | 255.5 |
枫桦Betula costata | 674 | 17.80 | 88.00 | 229.5 |
Table 3
Indicators for judging spatial distribution patterns
尺度 Scale/m | 方差/均值比率 Variance to mean ratio(C0) | t检验 t test | 负二项指数 Negative Binomial Distribution index(K) | Cassie 指标 Cassie index (C) | Green 指数Green index (G) | Morisita 指数 Morisita index (I) | 丛生指数 Clumping Index (I0) |
---|---|---|---|---|---|---|---|
5×5 | 2.84 | 90.10 | 0.04 | 28.30 | 0.001 | 44.81 | 1.84 |
5×10 | 3.43 | 84.13 | 0.05 | 18.69 | 0.001 | 27.45 | 2.43 |
10×10 | 5.06 | 99.37 | 0.06 | 15.61 | 0.001 | 20.50 | 4.06 |
10×20 | 6.36 | 92.69 | 0.10 | 10.30 | 0.012 | 13.24 | 5.36 |
20×20 | 10.48 | 115.86 | 0.11 | 9.11 | 0.033 | 11.07 | 9.48 |
Table 4
Parameter assessment and evaluation of r regeneration count model for Taxus cuspidata seedlings
参数 Parameters | 模型参数估计 Model parameter estimates | |||
---|---|---|---|---|
泊松模型 Poisson | 负二项分布模型 NB | 零膨胀负二项分布模型 ZIP | 门槛-泊松模型 Hurdle-Poisson | |
截距Intercept | 0.932* | 2.334*** | 4.623*** | 1.726*** |
总蓄积Total volume | 0.239** | |||
平均胸径 Stand average diameter at breast height | -0.089** | |||
W平均值 Stand average neighborhood comparison | 2.349*** | -2.928*** | -2.521** | |
U平均值 Stand average uniform angle index | -3.294* | |||
香农指数 Shannon wiener diversity index(H) | 0.590** | 0.703* | ||
截距(零部分) Intercept(zero part) | 3.698*** | -3.207*** | ||
U平均值(零部分) Stand average uniform angle index(zero part) | -3.855* | |||
评价指标 Evaluation indicators | 模型参数评价 Model parameter evaluation | |||
泊松模型 Poisson | 负二项分布模型 NB | 零膨胀负二项分布模型 ZIP | 门槛-泊松模型 Hurdle-Poisson | |
赤池信息量准则(AIC) | 1 570.270 | 1 032.789 | 1 142.764 | 1 151.325 |
贝叶斯信息量准则(BIC) | 1 584.870 | 1 047.390 | 1 176.832 | 1 175.659 |
对数似然(LogL) | -782.135 | -513.395 | -564.382 | -570.662 |
均方根误差(RMSE) | 0.987 | 0.985 | 0.987 | 0.987 |
平均绝对误差(MAE) | 0.433 | 0.434 | 0.441 | 0.437 |
Table 5
Comparison of Vuong tests for each model
模型比较 Model comparison | Vuong | Vuong-A | Vuong-B | 比较结果 Results | P | P-A | P-B |
---|---|---|---|---|---|---|---|
Poisson vs NB | -3.614 | -3.627 | -3.660 | model2>model1 | 0.000 2 | 0.000 1 | 0.000 1 |
Poisson vs ZIP | -3.740 | -3.671 | -3.504 | model2>model1 | 0.000 1 | 0.000 1 | 0.000 2 |
Poisson vs Hurdle-Poisson | -3.773 | -3.738 | -3.651 | model2>model1 | 0.000 1 | 0.000 1 | 0.000 1 |
NB vs ZIP | 2.506 | 2.751 | 3.350 | model1>model2 | 0.006 1 | 0.003 0 | 0.000 4 |
NB vs Hurdle-Poisson | 2.655 | 2.794 | 3.132 | model1>model2 | 0.004 0 | 0.002 6 | 0.000 9 |
ZIP vs Hurdle-Poisson | 0.908 | 0.619 | -0.085 | model1>model2 | 0.182 1 | 0.268 1 | 0.466 2 |
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