Effects of Neighborhood Structure on Radial Growth of Larix olgensis and Quercus mongolica with Different Diameter Classes

doi:10.7525/j.issn.1673-5102.2025.02.011

Abstract

Abstract:

Clarifying the relationship between the radial growth and neighborhood structure of trees is helpful to understand the subtleties of stand structure and to make forest management more quantitative and precise. The Larix olgensis and Quercus mongolica forests in Xiaobeihu Nature Reserve were taken as materials， and the radial growth and neighborhood structural parameters of different diameter classes of dominant and associated tree species were calculated respectively. The direct and indirect effects of neighborhood structure on the radial growth of trees with different diameter classes were explored by path analysis. The results showed that： whether as dominant or associated tree species， the radial growth of small diameter class trees of L. olgensis and Q. mongolica was lower than that of medium and large diameter classes. The radial growth of L. olgensis was lower than that of Q. mongolica in the small diameter class， but higher than that of Q. mongolica in the medium and large diameter classes. The radial growth of small and medium diameter trees was significantly correlated with neighborhood structure， but not for large diameter trees. Open comparison（O_P） and competition index（C_I） were the main factors affecting the radial growth of L. olgensis and Q. mongolica， and the effect of associated tree species was higher than that of dominant tree species. The effect of neighborhood structure on radial growth gradually decreased with the increase of diameter class. In addition， the indirect interaction between O_P and C_I also affected the radial growth of L. olgensis and Q. mongolica. Therefore， when forest management was carried out in this area， the small and medium diameter class trees should be selected to adjust neighborhood structure， mainly by improving O_P and reducing C_I.

Key words: tree growth, forest spatial structure, neighborhood structure, tree competition, tree spatial distribution

CLC Number:

S758.5

Yanli ZENG, Yanhui GUAN, Lujing QIAO, Yating CHEN, Cunyong JU, Tijiu CAI. Effects of Neighborhood Structure on Radial Growth of Larix olgensis and Quercus mongolica with Different Diameter Classes[J]. Bulletin of Botanical Research, 2025, 45(2): 254-265.

Figures/Tables 9

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径级 Diameter class	近邻体结构指数 Neighborhood structural index	优势黄花落叶松 DLo					伴生黄花落叶松 ALo					优势蒙古栎 DQm					伴生蒙古栎 AQm
		直接路径系数 Direct path coefficient	间接路径系数 Indirect path coefficient				直接路径系数 Direct path coefficient	间接路径系数 Indirect path coefficient				直接路径系数 Direct path coefficient	间接路径系数 Indirect path coefficient				直接路径系数 Direct path coefficient	间接路径系数 Indirect path coefficient
		直接路径系数 Direct path coefficient	C_I	M_si	W	O_P	直接路径系数 Direct path coefficient	C_I	M_si	W	O_P	直接路径系数 Direct path coefficient	C_I	M_si	W	O_P	直接路径系数 Direct path coefficient	C_I	M_si	W	O_P
小径级 Small diameter class	C_I	-0.183		-0.007	-0.029	0.079	-0.454		-0.093	0.053	0.268	-0.216		-0.008	-0.011	0.082	-0.446		-0.094	-0.100	0.052
	M_si	-0.162	-0.006		-0.018	-0.059	0.180	0.037		-0.013	-0.042	0.016	0.001		-0.002	0	-0.077	-0.016		-0.011	0.020
	W	-0.202	-0.032	-0.022		-0.008	0.031	-0.004	-0.002		-0.003	-0.060	-0.003	0.008		0.005	0.222	0.050	0.030		-0.021
	O_P	0.027	-0.012	0.010	0.001		0.084	-0.050	-0.019	-0.007		0.251	-0.095	-0.002	-0.022		0.594	-0.069	-0.151	-0.056
中径级 Medium diameter class	C_I	-0.186		0.016	0.008		-0.174		0.048	0.068	0.016	-0.127		0.010	0.014	0.037	-0.079		-0.021	0.002	0.008
	M_si	-0.049	0.004		0.008	-0.004	-0.098	0.027		-0.011	0.031	-0.052	0.004		-0.005	0.009	0.390	0.105		-0.050	0.021
	W	-0.046	0.002	0.007		-0.004	0.084	-0.033	0.009		-0.019	0.031	-0.003	0.003		0.004	-0.162	0.004	0.021		0.001
	O_P	0.282	-0.147	0.024	0.022		0.308	-0.028	-0.096	-0.071		0.243	-0.070	-0.039	0.035		0.390	-0.041	0.021	-0.003
大径级 Large diameter class	C_I	0.135		-0.050	0.007	0.001	0.081		-0.022	0.030		-0.045		0.006	0.002	0	0		0	0	0
	M_si	0.115	-0.042		0.001	0.008	-0.179	0.049		-0.007		-0.047	0.006		-0.002	-0.002	0	0		0	0
	W	0.063	0.003	0		-0.002	0.264	0.098	0.010			0.024	-0.001	0.001		0.001	0	0	0		0
	O_P	0.033	0	0.002	-0.001							-0.051	0	-0.002	-0.001		0	0	0	0

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