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Forest and Grassland Resources Research >

2019 , Vol. 0 >Issue 1: 63 - 69

DOI: https://doi.org/10.13466/j.cnki.lyzygl.2019.01.011

Scientific Research

Study on Relationship between DBH and Crown Diameter of Pinus densata and Its Application in Southeastern Tibet

  • Xiaolan WANG ,
  • Jiarui CHEN ,
  • Zhen XING ,
  • Chuanlong ZHANG
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  • 1. Resources & Environment College,Tibet Agriculture & Animal Husbandry University,Nyingchi 860000,China
    2. Research Institute of Tibet Plateau Ecology,Tibet Agriculture & Animal Husbandry University,Nyingchi 860000,China

Received date: 2018-11-05

  Revised date: 2018-12-04

  Online published: 2020-09-25

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Abstract

2 041 standing trees were measured from 56 sampling plots in Milin County,Bayi District and Bomi County,where is the major distribution area of Pinus densata in Tibet.The aim of this study was to establish the relationship of diameter at breast(D)and crown diameter(Cd)of P.densata natural forest in the southeastern Tibet.The result showed that the Cd had a significant correlation with the D.The optimal regression model of Cd with D was Cd= -0.001D2+0.244D+0.184.The Cd/D ratio decreased as D increased,and dropped rapidly at initial stage(D=0~20 cm),beginning to stabilize at around 20 in trees bigger than 20 cm dbh.The optimal regression model of Cd/D with D was logarithmic function Cd/D=-4.473ln(D)+36.098.Besides,according to the regression of Cd and D,the optimal management density table under different diameter classes has been established.It not only helps to determine the thinning intensity but also provides references about tree number in the afforestation design and forest management planning in this region.

Key words： Pinus densata natural forest; diameter at breast(D); crown diameter(Cd); Cd/D ratio; management density

Cite this article

Xiaolan WANG , Jiarui CHEN , Zhen XING , Chuanlong ZHANG . Study on Relationship between DBH and Crown Diameter of Pinus densata and Its Application in Southeastern Tibet[J]. Forest and Grassland Resources Research, 2019 , 0(1) : 63 -69 . DOI: 10.13466/j.cnki.lyzygl.2019.01.011

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