广西林业科学2024，Vol.53Issue(3)：359-368,10.DOI:10.19692/j.issn.1006-1126.20240312
基于结构方程模型的城郊森林公园林分空间结构评价
Evaluation on Stand Spatial Structure of Suburban Forest Park Based on Structural Equation Model
摘要
Abstract
In order to explore effective measures to optimize stand spatial structure,taking Taiyuan Forest Park as study object,structural equation model was established based on conduction mechanism by taking horizontal spatial structure,vertical spatial structure and competitive spatial structure as first-order factors,stand spatial structure as second-order factor,and indexes were assigned with weights.Based on measured data of sample plots,stand spatial structure of Taiyuan Forest Park was evaluated comprehensively.Results showed that aver-age fitness index(χ2/df)of structural equation model for stand spatial structure evaluation was 1.285,root mean square error of approximation(RMSEA)was 0.046,and value-added fitness indexes including CFI,TLI and NFI were 0.986,0.973 and 0.941 respectively,which were in line with reference values of fitness and could sat-isfy research needs.Weights of three factors in criterion layer in stand spatial structure evaluation system,which were horizontal,vertical and competitive spatial structures,were 0.352,0.347 and 0.301 respectively,with horizontal and vertical spatial structures being key factors affecting stand spatial structure.Comprehensive scores of stand spatial structures in sample plots of study area ranged from 0.31 to 0.78,concentrating on gradesⅡ,ⅢandⅣ.Number of sample plots in different grades followed order of gradeⅣ(7 plots)>gradeⅢ(6 plots)>grade Ⅱ(1 plot).Stand spatial structure was mainly affected by horizontal and vertical spatial structures.In order to improve overall stand spatial structure,measures such as single-tree harvesting,thinning and multi-species replanting should be taken.关键词
林分空间结构/结构方程模型/综合评价/城郊森林公园Key words
stand spatial structure/structural equation model/comprehensive evaluation/suburban forest park分类
农业科技引用本文复制引用
杜锦瑞,冯雨萌,杨露露,马瑞皓,武小钢,杨秀云..基于结构方程模型的城郊森林公园林分空间结构评价[J].广西林业科学,2024,53(3):359-368,10.基金项目
山西省基础研究计划项目(202103021224142,202103021224144) （202103021224142,202103021224144）
山西省太原市植物园横向项目(2022HX095) （2022HX095）
山西省太行山区高速公路低碳植物配置及栽培技术研究(2024QT002) （2024QT002）
