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Forest and Grassland Resources Research >

2020 , Vol. 0 >Issue 2: 94 - 102

DOI: https://doi.org/10.13466/j.cnki.lyzygl.2020.02.015

Scientific Research

A Study on the Growth Model of Individual Trees in Natural Mixed Forests of Oak and Pinus Massoniana in Hunan

  • Qilong ENG ,
  • Zhefu CHEN ,
  • Duanlv CHEN
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  • 1. Forestry Investigation and Design Team of Loudi City,Loudi,Hunan 417000
    2. Hunan University of Arts and Science,Changde,Hunan 415006

Received date: 2020-01-02

  Revised date: 2020-04-19

  Online published: 2020-06-15

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Abstract

In order to provide scientific guidance for the increment of quality of the mixed Oak and Pinus massoniana natural forest,establishing the growth model of individual volume and basal area.Twenty-three mixed Oak and Pinus massoniana natural forests in nine areas of Hunan province were selected to construct the growth models of individual volume and basal area.Through analysis,we can know that Richards model was the best model for volume and basal area growth of the two tree species,the determining coefficients (R 2) were the highest and the sum of squares of residuals (SSE) were the smallest.The result of mixed effect models show that the random effects of the Oak single-wood volume and basal area growth model are best at parameter a1,while the volume and basal area growth model of Pinus massoniana are best at parameter b1 and a1+b1.Compared with the basic model,the fitting precision (P) and determination coefficients of the mixed effect model are improved.Mean error (ME),mean absolute error (MAE),mean percent error (RME) and mean absolute percent error (RMAE) are all slumped substantially.The results show that wood volume and basal area growth of natural forests are greatly affected by the differences between tree species and site types.Mixed-effect model can take full account of the differences between sites,and solve this problem well.

Key words： mixed Oak and Pinus massoniana forest; growth model; basal area; stem volume; mixed effect

Cite this article

Qilong ENG , Zhefu CHEN , Duanlv CHEN . A Study on the Growth Model of Individual Trees in Natural Mixed Forests of Oak and Pinus Massoniana in Hunan[J]. Forest and Grassland Resources Research, 2020 , 0(2) : 94 -102 . DOI: 10.13466/j.cnki.lyzygl.2020.02.015

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