Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (8): 76-88.doi: 10.11707/j.1001-7488.20220808
• Research papers • Previous Articles Next Articles
Wenfei Zhao1,Xiaoyu Cao1,2,*,Zhengchang Xie1,Yifan Pang1,Yaping Sun1,Jiping Li1,2,Yongjun Mo1,Da Yuan1
Received:
2022-03-21
Online:
2022-08-25
Published:
2022-12-19
Contact:
Xiaoyu Cao
CLC Number:
Wenfei Zhao,Xiaoyu Cao,Zhengchang Xie,Yifan Pang,Yaping Sun,Jiping Li,Yongjun Mo,Da Yuan. Evaluation of Stand Spatial Structure of Cunninghamia lanceolata Public Welfare Forest by Using Structural Equation Model[J]. Scientia Silvae Sinicae, 2022, 58(8): 76-88.
Table 1
Basic information of sample plots"
龄组 Age group | 样地号 Plot code | 树种组成 Species composition | 平均胸径 Mean DBH/cm | 平均树高 Mean height/m | 平均冠幅 Mean crown/m | 坡位 Slope position | 坡度 Gradient/(°) |
幼龄林 Young forest | 1 | 10杉 | 4.6 | 3.2 | 1.8 | 中Mesoslope | 28 |
2 | 10杉 | 5.8 | 3.6 | 1.9 | 上Upslope | 30 | |
3 | 10杉-柳 | 4.1 | 2.3 | 1.5 | 中Mesoslope | 28 | |
4 | 10杉 | 4.9 | 2.6 | 1.8 | 上Upslope | 29 | |
5 | 10杉 | 5.1 | 3.0 | 2.1 | 中Mesoslope | 32 | |
6 | 10杉 | 4.7 | 2.8 | 1.9 | 下Downslope | 29 | |
7 | 10杉+马 | 6.3 | 4.0 | 2.1 | 下Downslope | 31 | |
8 | 10杉 | 8.5 | 4.8 | 2.0 | 中Mesoslope | 24 | |
9 | 10杉 | 6.1 | 3.6 | 2.3 | 上Upslope | 20 | |
10 | 10杉+毛 | 6.8 | 4.1 | 2.2 | 上Upslope | 25 | |
中龄林 Middle aged forest | 11 | 10杉-山 | 11.2 | 6.1 | 2.9 | 中Mesoslope | 28 |
12 | 10杉+黄 | 10.9 | 5.4 | 2.2 | 下Downslope | 30 | |
13 | 10杉+山 | 10.6 | 6.0 | 2.1 | 下Downslope | 25 | |
14 | 10杉 | 12.4 | 6.1 | 3.1 | 中Mesoslope | 23 | |
15 | 10杉+柳 | 11.9 | 5.9 | 3.0 | 中Mesoslope | 30 | |
16 | 10杉-黄 | 10.3 | 5.8 | 2.8 | 下Downslope | 24 | |
17 | 10杉 | 12.0 | 8.1 | 2.5 | 中Mesoslope | 32 | |
18 | 10杉 | 12.4 | 8.8 | 3.1 | 中Mesoslope | 20 | |
19 | 10杉-青 | 10.5 | 7.9 | 2.8 | 中Mesoslope | 18 | |
20 | 10杉 | 11.9 | 7.6 | 2.7 | 中Mesoslope | 25 | |
近熟林 Near-mature forest | 21 | 10杉 | 13.5 | 8.8 | 3.4 | 中Mesoslope | 28 |
22 | 10杉-毛 | 13.0 | 9.2 | 3.4 | 中Mesoslope | 31 | |
23 | 10杉 | 12.3 | 8.9 | 3.0 | 下Downslope | 29 | |
24 | 10杉 | 16.1 | 10.9 | 4.3 | 中Mesoslope | 25 | |
25 | 10杉-毛 | 14.9 | 11.2 | 3.2 | 下Downslope | 26 | |
26 | 10杉 | 15.6 | 9.9 | 3.9 | 中Mesoslope | 27 | |
27 | 10杉 | 13.9 | 9.7 | 3.2 | 中Mesoslope | 31 | |
28 | 10杉+苦 | 13.6 | 9.4 | 2.9 | 中Mesoslope | 30 | |
29 | 9杉1毛 | 16.1 | 10.7 | 3.1 | 中Mesoslope | 28 | |
30 | 10杉 | 14.8 | 10.3 | 3.9 | 下Downslope | 22 |
Table 2
Classification standard of stand spatial structure evaluation"
林分空间结构综合得分 Comprehensive score value of stand spatial structure | 林分特征描述 The description of stand feature | 评价等级 Evaluation grade |
[0, 0.2) | 单木所在结构单元内空间结构差。树种混交程度低,林层单一,透光条件差,单木生长处于劣势状态,林木聚集分布 The spatial structure in the structural unit where the single tree is located is poor. Themingling degree of tree species is low, the structure of forest layer is simple, the light transmission condition is poor, the growth of single tree is in an inferior position, and the trees are in contagious distribution | Ⅰ |
[0.2, 0.4) | 单木所在结构单元内空间结构较差。树种混交程度较低,林层多样性一般,透光条件较差,单木生长处于被压状态,林木聚集分布 The spatial structure in the structural unit where the single tree is located is slightly poor. Themingling degree of tree species is slightly low, the diversity of forest layer is general, the light transmission condition is slightly poor, the growth of single tree is in the pressed state, and the trees are in contagious distribution | Ⅱ |
[0.4, 0.6) | 单木所在结构单元内空间结构一般。树种混交程度中等,林层较为多样,透光条件一般,单木生长处于中庸状态,林木均匀分布 The spatial structure in the structural unit where the single tree is located is general. Themingling degree of tree species is medium, the structure of forest layer is comparatively diverse, the light transmission condition is general, the growth of single tree is in a moderate state, and the trees are in uniform distribution | Ⅲ |
[0.6, 0.8) | 单木所在结构单元内空间结构较好。混交树种较多,林层结构较为复杂,透光条件较好,单木生长处于优势状态,林木接近随机分布 The spatial structure in the structural unit where the single tree is located is slightly good. There are a number of mixed tree species, the structure of forest layer structure is complex, the light transmission condition is good, the growth of single tree is in a dominant state, and the trees are close to random distribution | Ⅳ |
[0.8, 1.0] | 单木所在结构单元内空间结构好。林木处于理想的生长状态:树种丰富,林层多为3层以上的复层林,透光条件好,单木生长处于优势状态,林木随机分布 The spatial structure in the structural unit where the single tree is located is good. The trees are in an ideal growth state: the tree species is abundant, the structure of forest layer is mostly multi-layer forest with more than 3 layers, the light transmission condition is good, the growth of single tree is in a dominant state, and the trees are in random distribution | Ⅴ |
Table 4
Calculation results of stand spatial structure index weight"
目标层Target layer | 准则层Criterion layer | 权重Weight | 指标层Index layer | 权重Weight |
林分空间结构 Stand spatial structure | 水平空间结构 Horizontal spatial structure | 0.522 9 | 全混交度Totalmingling degree | 0.338 6 |
角尺度Uniform angle index | 0.291 3 | |||
空间密度指数Spatial density index | 0.370 1 | |||
垂直空间结构 Vertical spatial structure | 0.477 1 | 林层指数Storey index | 0.306 8 | |
开敞度Open degree | 0.346 6 | |||
交角竞争指数Angle competition index | 0.346 6 |
Table 5
Parameter value and comprehensive score of stand spatial structure"
龄组 Age group | 全混交度 Total mingling degree | 角尺度 Uniform angle index | 空间密度指数 Spatial density index | 林层指数 Storey index | 开敞度 Open degree | 交角竞争指数 Angle competition index | 综合得分 Comprehensive score | 等级 Grade |
幼龄林 Young forest | 0.029 8±0.04a | 0.424 6±0.03b | 0.552 7±0.06a | 0.150 5±0.04b | 0.402 2±0.09a | 0.254 3±0.02b | 0.378 1±0.11a | Ⅱ |
中龄林 Middle aged forest | 0.056 9±0.04a | 0.451 3±0.02a | 0.539 7±0.15a | 0.248 8±0.07a | 0.270 2±0.07b | 0.279 6±0.03b | 0.452 6±0.09a | Ⅲ |
近熟林 Near-mature forest | 0.043 9±0.03a | 0.466 9±0.02a | 0.548 3±0.11a | 0.291 8±0.05a | 0.140 0±0.05c | 0.381 9±0.08a | 0.377 5±0.08a | Ⅱ |
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