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Forest and Grassland Resources Research >

2020 , Vol. 0 >Issue 5: 89 - 99

DOI: https://doi.org/10.13466/j.cnki.lyzygl.2020.05.014

Study on Growth Model of DBH and Height Based on Dummy Variable for Natural oak Forest in Qinba Mountain Area

  • Zhiqiang MIN ,
  • Yunyun HU ,
  • Dejun WANG ,
  • Jingmei SUN ,
  • Hongtao LI ,
  • Weizhong LI
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  • 1. Key Laboratory National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions,Northwest Surveying,Planning and Designing Institute of National Forestry and Grassland Administration,Xi'an 710048,China
    2. College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,China;

Received date: 2020-07-29

  Revised date: 2020-09-27

  Online published: 2020-11-30

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Abstract

Based on the national forest resources inventory data,this study takes the natural oak forest in Qinba mountain area as the research object.The dominant trees and their competitive grades were determined based on the competition index and the site quality grade was determined according to the dominant trees and site dominant factors.The competition grade and site quality grade were used as dummy variables in the fitting of the growth process of the DBH and tree height to obtain the optimal growth model.The results showed that the dominant site factors of oak natural forest were altitude,aspect and soil thickness;Gompertz model was the optimal basic model for the DBH and tree height growth model;the best fitting results were obtained when the dummy variable of competition grade was in parameters a and c,in which R 2 value and Pa value were 0.834 and 98.17,respectively,13.16% and 0.59% higher than those of the basic model. The study found that the height growth model used Gompertz model when the dummy variables of site quality grade were in parameters a and b,the fitting results were the best.R 2 value and Pa value were 0.717 and 98.26 respectively,which were 16.59% and 0.65% higher than those of the basic model.When the second kind of dummy variable is introduced into the DBH and tree height model,the accuracy of the model is improved,but the effect is not obvious.Based on the analysis of the DBH and tree height growth rules of natural oak forest under different growth conditions in Qinba mountain area,the stand growth model was established,which can provide important reference for the restoration of natural oak secondary forest and the improvement of stand quality.

Key words： natural oak; dummy variable; site quality; competitive index; growth model

Cite this article

Zhiqiang MIN , Yunyun HU , Dejun WANG , Jingmei SUN , Hongtao LI , Weizhong LI . Study on Growth Model of DBH and Height Based on Dummy Variable for Natural oak Forest in Qinba Mountain Area[J]. Forest and Grassland Resources Research, 2020 , 0(5) : 89 -99 . DOI: 10.13466/j.cnki.lyzygl.2020.05.014

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