Application of structural equation model in growth of Larix gmelinii stand

doi:10.12302/j.issn.1000-2006.202104028

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1): 38-46.doi: 10.12302/j.issn.1000-2006.202104028

Special Issue: 智慧林业之森林参数遥感估测

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Application of structural equation model in growth of Larix gmelinii stand

GAO Yu(), LI Jing, LIU Yang(), WU Yahan, GONG Jiaxing, XIN Qirui

College of Forestry, Inner Mongolia Agricultural University, Hohhot 010019, China

Received:2021-04-17 Accepted:2022-03-22 Online:2023-01-30 Published:2023-02-01
Contact: LIU Yang E-mail:gaoyu12020@163.com;liuyangvip@hotmail.com

Abstract

Abstract:

【Objective】 Structural equation modelling (SEM) was used to determine the effects of climate, soil, and altitude on growth indicators and pathway relationships in Xing’an larch (Larix gmelinii) forests. 【Method】 The annual mean temperature, annual mean precipitation, solar radiation, soil total nitrogen content, soil organic carbon density, and altitude were selected as influencing factors to explore the relationships between aboveground biomass, underground biomass, and tree height and these underlying factors. A structural equation model of climate, soil, and altitude was constructed using AMOS 21.0 software to measure the growth of Larix gmelinii stand. 【Result】 The aboveground and underground biomass of Larix gmelinii first increased and then decreased with an increase in altitude and annual mean precipitation, and the tree height increased with increasing altitude. The aboveground and underground biomass increased with an increase in soil organic carbon density. The total effect coefficient of altitude on the growth of Larix gmelinii was positive (0.200), and the direct effect (0.224) of altitude on the growth of Larix gmelinii was greater than the indirect effect (-0.024). The total effect coefficient of the climatic factors on the growth of Larix gmelinii was negative, at -0.771. The total influence coefficient of soil factors on the growth of Larix gmelinii was -0.216, which means these factors can slightly inhibit the growth of Larix gmelinii. 【Conclusion】 According to the path coefficient of the structural equation model, the absolute value of the total influence coefficient of climate factors was the largest, followed by that of soil and altitude. The static growth of Larix gmelinii forest is mainly restricted by climatic factors, which has guiding significance for predicting and evaluating changes in forest growth at high latitudes under the condition of global climate change.

Key words: Larix gmelinii, influence coefficient, climate factor, soil factor, elevation, aboveground and belowground biomass, tree height, structural equation model

CLC Number:

S791.22

GAO Yu, LI Jing, LIU Yang, WU Yahan, GONG Jiaxing, XIN Qirui. Application of structural equation model in growth of Larix gmelinii stand[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(1): 38-46.

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统计值 statistics	地形因子 topographic factor
统计值 statistics	海拔/m altitude	坡度/ (°) slope	SR/ (kJ·m^-2· d^-1)	MAT/ ℃	MAP/ mm	SOCD/ (Mg· hm^-2)	STNC/ (g·kg^-1)	CMF/%	d_o/cm	树高/m tree height	AGB/ (Mg· hm^-2)	BGB/ (Mg· hm^-2)	树龄/a tree age	疏密度 stocking degree
最小值min	233.40	1.00	19 046	-0.57	563.02	70.26	2.68	6.00	20.00	10.00	0.26	1.36	7.00	0.08
最大值max	1 087.70	26.00	20 569	6.57	973.03	269.14	21.50	28.00	150.00	29.00	369.10	106.00	201.00	0.65
平均值mean	587.59	9.41	19 839.19	2.79	752.01	156.55	11.01	22.41	58.42	21.56	140.52	31.62	26.00	0.26
标准差SD	212.15	6.90	441.67	2.74	122.14	60.29	5.06	4.64	23.09	4.51	79.56	21.64	32.00	0.12

评价指标 index	参数名称 parameter name	评价标准 evaluation criteria standard	模型参数 model parameters
绝对拟合指数 absolute fitting index	卡方自由度比(x²/df)	<3	1.513
	适配度指数(GFI)	>0.90	0.971
	显著性概率值(P)	>0.05	0.097
	近似误差均方根 (RMSEA)	<0.08	0.056
相对拟合指数 relative fitting index	规准适配指数(NFI)	>0.90	0.983
	非规准适配指数(TLI)		0.985
	比较适配指数(CFI)		0.994
	增值适配指数(IFI)		0.994

Application of structural equation model in growth of Larix gmelinii stand

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