Optimization of spatial structure of Cunninghamia lanceolata mixed forests based on uniform,dominance and mingling

doi:10.13466/j.cnki.lczyyj.2025.01.005

Abstract

Abstract:

Optimizing the spatial structure of forest stands can significantly enhance forest quality and further unlock the functional and economic benefits of forests.This study focuses on the Cunninghamia lanceolata mixed forests in Meicheng Forest Farm,Jiande City,Zhejiang Province.Firstly,the uniform(W),dominance(U),and mingling(M)indices integrated into a multi-objective optimization framework using multiplication and division methods,thereby constructing a spatial structure optimization model for the forest stand.Then,the simulated annealing was applied to solve the model derive the selection cutting plan.Finally,a comparative analysis was conducted on the variations in spatial structure parameters and binary distribution of the forest stand before and after the simulated selection cutting.The results showed that,following the simulation,the uniformity increased by 2.34%,dominance decreased by 0.82%,mingling among mixed tree species increased by 11.36%,and the objective function value rose by 12.42%,which collectively improved the spatial structure of the forest stand.After selection cutting,the binary distribution characteristics of the spatial structure became more reasonable.Therefore,the forest stand spatial structure optimization system developed in this study,based on W,U,and M indices,effectively enhances the spatial structure characteristics of the forest and offers valuable insights for the formulation of future forest management strategies.

Key words: stand spatial structure, selection cutting, optimization models, simulated annealing, binary distribution

CLC Number:

S758.5

CHEN Chao, ZHAO Yinyin, YU Jiacong, LI Xuejian, FANG Qing, ZHANG Yehua, SONG Meixuan, DU Huaqiang. Optimization of spatial structure of Cunninghamia lanceolata mixed forests based on uniform,dominance and mingling[J]. Forest and Grassland Resources Research, 2025, (1): 38-47.

Figures/Tables 8

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树种	株数/株	胸径/cm
树种	株数/株	最大值	最小值	极差	均值	标准差
杉木(Cunninghamia lanceolata)	524	37.3	8.2	29.1	25.6	3.6
侧柏(Platycladus orientalis)	54	27.9	5.8	22.1	11.6	4.5
马尾松(Pinus massoniana)	50	28.5	10.2	18.3	16.1	4.8
红豆树(Ormosia hosiei)	8	5.4	5.1	0.3	5.2	0.1
阔叶树	24	21.2	5.9	15.3	12.7	5.2

林分空间结构参数	参数取值
林分空间结构参数	0.00	0.25	0.50	0.75	1.00
角尺度(W)
	非常均匀	相对均匀	随机	相对聚集	非常聚集
胸径优势度(U)
	绝对优势	相对优势	中等	相对劣势	绝对劣势
混交度(M)
	零度混交	弱度混交	中度混交	强度混交	完全混交

参数	择伐前	择伐后	变化趋势	变化幅度/%
角尺度(W)	0.428	0.438	增大	2.34
胸径优势度(U)	0.485	0.481	减小	0.82
混交度(M)	0.176	0.196	增大	11.36
径阶个数/个	17	17	不变
树种个数/个	5	5	不变