林分空间结构优化栅格间伐模型

doi:10.12302/j.issn.1000-2006.202005027

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南京林业大学学报（自然科学版） ›› 2021, Vol. 45 ›› Issue (3): 199-205.doi: 10.12302/j.issn.1000-2006.202005027

林分空间结构优化栅格间伐模型

赖国桢¹(), 汪雁楠¹, 黄宝祥¹, 周光¹, 莫晓勇², 刘丽婷¹^,^*()

1.江西省林业科学院, 江西南昌 330032
2.华南农业大学林学与风景园林学院, 广东广州 510642

收稿日期:2020-05-18 修回日期:2020-08-31 出版日期:2021-05-30 发布日期:2021-05-31
通讯作者: 刘丽婷
基金资助:
江西省林业科学院重大科研及成果推广专项(2017511201)

A grid thinning model based on forest spatial structure optimization

LAI Guozhen¹(), WANG Yannan¹, HUANG Baoxiang¹, ZHOU Guang¹, MO Xiaoyong², LIU Liting¹^,^*()

1. Jiangxi Forestry Academy, Nanchang 330032,China
2. College of Forestry and Landscape Architecture, South China Agricultural University,Guangzhou 510642, China

Received:2020-05-18 Revised:2020-08-31 Online:2021-05-30 Published:2021-05-31
Contact: LIU Liting

摘要/Abstract

摘要：

【目的】构建林分空间结构优化栅格间伐模型,以期获得高效、便捷的间伐方案。【方法】在随机间伐模型的基础上,提出将林地栅格化处理的栅格间伐法,并使用随机间伐法对栅格间伐法进行检验,最后以金盆山次生林为例验证模型的适用性。【结果】间伐模拟前,次生林空间结构整体表现不够理想,在角尺度、开敞度和竞争指数方面有待提高;恢复年限33、40、45 a次生林的最佳间伐强度分别为34.69%、21.14%、29.90%,评价指数分别提高了47.94%、53.94%和79.73%,其中33和40 a次生林适用于栅格间伐法,采伐方式分别为栅格边长7 m栅格内伐去3株胸径最小的林木和栅格边长6 m栅格内伐去3株胸径最小的林木。【结论】栅格间伐模型能有效地改善林分空间分布格局,但仅适用于林木分布较为均匀的次生林林分,对于分布不均匀的林分,模型只能确定样地内的间伐木及间伐强度。

关键词: 空间结构优化, 栅格间伐, 随机间伐, 次生林

Abstract:

【Objective】 A grid thinning model based on forest spatial structure optimization was constructed to obtain an efficient and convenient thinning method. 【Method】 Based on the random thinning model, the grid thinning method was proposed, and the random thinning method was used to test the grid thinning method. The grid thinning method indicates that the rasterized forest land is divided into several continuous square grids with the length of integer A, the cutting amount K, and square grid edge length A. Using these variables, all possible thinning methods were enumerated to simulate thinning. Finally, the applicability of the model was verified using the secondary forest of the Jinpenshan Mountain. 【Result】The spatial structure of the secondary forest is not ideal and needs to be improved in terms of the uniform angle index, opening degree and competition index. The optimal thinning intensities of the 33, 40 and 45 years old secondary forests were 34.69%, 21.14% and 29.90%, respectively, and the evaluation index increased by 47.94%, 53.94% and 79.73%, respectively. The 33 and 40 years old forests were suitable for using the grid thinning method, with cutting methods as follows: three trees with the smallest DBH were removed from the grid having a length of 7 m; three trees with the smallest DBH were removed from the grid having a length of 6 m. 【Conclusion】The grid thinning model can effectively improve the spatial distribution pattern of stands, but it is only applicable to the secondary stands with a more uniform forest distribution. For unevenly distributed stands, the model can only determine the interlogging and thinning intensities for the sample plots.

Key words: spatial structure optimization, grid thinning, random thinning, secondary forest

中图分类号:

S753

赖国桢,汪雁楠,黄宝祥,等. 林分空间结构优化栅格间伐模型[J]. 南京林业大学学报（自然科学版）, 2021, 45(3): 199-205.

LAI Guozhen, WANG Yannan, HUANG Baoxiang, ZHOU Guang, MO Xiaoyong, LIU Liting. A grid thinning model based on forest spatial structure optimization[J].Journal of Nanjing Forestry University (Natural Science Edition), 2021, 45(3): 199-205.DOI: 10.12302/j.issn.1000-2006.202005027.

图/表 7

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恢复年限/a restoration age	面积/ m² area	株数 tree number	树种数 number of species	胸径/ cm DBH	树高/ m tree height	树种组成 species composition
33	1 600	294	25	12.01	11.24	2木+2拟+2杉+ 丝、枫等
40	1 600	298	29	13.49	11.47	5米+1石+1木+ 鹿、木姜等
45	1 600	303	17	13.17	12.49	3青钩+2丝+2木+ 青、杜等

空间结构指数 spatial structure index	空间结构类型划分 spatial structure index type division
空间结构指数 spatial structure index	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ
混交度 mingling degree	0 (零度混交)	(0,0.25] (弱度混交)	(0.25,0.5] (中度混交)	(0.5,0.75] (强度混交)	(0.75,1] (极强混交)
开敞度 opening degree	(0,0.2] (严重不足)	(0.2,0.3] (不足)	(0.3,0.4] (基本充足)	(0.4,0.5] (充足)	(0.5,1] (极其充足)
角尺度 uniform angle index	(0.517,∞) (聚集分布)	(0,0.475) (均匀分布)	[0.475,0.517] (随机分布)
大小比数 neighbourhood comparison	(0.75,1] (绝对劣势)	(0.5,0.75] (劣势)	(0.25,0.5] (中庸)	(0,0.25] (亚优势)	0 (优势)
竞争指数 competition index	(0.8,1] (绝对劣势)	(0.6,0.8] (劣势)	(0.4,0.6] (中庸)	(0.2,0.4] (亚优势)	(0,0.2] (优势)

恢复年限/a restoration age	混交度 mingling degree	开敞度 opening degree	角尺度 uniform angle index	大小比数 neighbourhood comparison	竞争指数 competition index	评价指数 evaluation number
33	0.808 5	0.185 7	0.378 6	0.499 1	0.251 2	3 741.851 5
40	0.823 9	0.217 9	0.415 2	0.502 2	0.266 2	2 831.755 2
45	0.764 1	0.139 2	0.436 8	0.509 7	0.277 5	2 248.937 2
平均值 mean	0.798 8	0.180 9	0.410 2	0.503 7	0.265 0	2 940.848 0

恢复年限/a restoration age	模块一(栅格间伐) module one (grid thinning)			模块二(随机间伐) module two(random thinning)			输出间伐方案 output thinning method
恢复年限/a restoration age	间伐强度/% thinning intensity	评价指数 evaluation number	变化幅度/% rangeability	间伐强度/% thinning intensity	评价指数 evaluation number	变化幅度/% rangeability	输出间伐方案 output thinning method
33	34.69	5 535.738 3	47.94	35.03	5 360.112	43.24	模块一,栅格边长6 m,栅格内伐去3株胸径最小的林木
40	21.14	4 359.241 1	53.94	25.68	4 331.128	52.95	模块一,栅格边长7 m,栅格内伐去3株胸径最小的林木
45	25.08	2 406.434 2	7.00	29.90	4 041.990	79.73	模块二

恢复年限/a restoration age	混交度 mingling degree		开敞度 opening degree		角尺度(调整后) uniform angle index(adjusted)		大小比数 neighbourhood comparison		竞争指数 competition index
恢复年限/a restoration age	模拟后 after simulation	变化幅度/% rangeability	模拟后 after simulation	变化幅度/% rangeability	模拟后 after simulation	变化幅度/% rangeability	模拟后 after simulation	变化幅度/% rangeability	模拟后 after simulation	变化幅度/% rangeability
33	0.850 0	5.13^*	0.185 8	0.05^*	0.188 3	3.12	0.510 0	2.18	0.231 6	-7.80^*
40	0.798 7	-3.06	0.211 8	-2.80	0.165 3	-16.43^*	0.483 1	-3.80^*	0.243 7	-8.45^*
45	0.813 8	6.50^*	0.171 5	23.20^*	0.167 5	-13.53^*	0.491 3	-3.61^*	0.248 8	-10.34^*
平均值 mean	0.820 8	2.75^*	0.189 7	4.85^*	0.173 7	-9.23^*	0.494 8	-1.76^*	0.241 4	-8.91^*

林分空间结构优化栅格间伐模型

A grid thinning model based on forest spatial structure optimization

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