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FOREST RESOURCES WANAGEMENT ›› 2019›› Issue (4): 46-51.doi: 10.13466/j.cnki.lyzygl.2019.04.007

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Developing Models for Tree Height Curves of Main Conifer Species in Yunnan Province

QIN Yangping1(), LI Hua1, LI Yongliang2, ZHANG Chengcheng1, WANG Meng1   

  1. 1. Kunming Survey & Design Institute of National Forestry and Grassland Administration,Kunming,Yunnan 650216,China
    2. Research Institute of Forest Resource Information Techniques,Chinese Academy of Forestry,Beijing 100091,China
  • Received:2019-05-13 Revised:2019-07-28 Online:2019-08-28 Published:2020-10-20

Abstract:

Tree height curve plays an important role in the forest management and yield regulation,the tree height curve model for main conifer species in Yunnan Province was established to provide reference for its forest management.Based on two periods of national forest inventory data in Yunnan Province,this paper takes Abies fabri,Pinus kesiya var.langbianensis,Pinus yunnanensis,Pinus armandii,Cunninghamia lanceolata as research objects,Richards etc.fifteen tree height curve models were selected as alternative models,the coefficient of determination,root mean square error,mean absolute error,total relative error and mean predict error were used as the evaluation indicators of the pros and cons of the model.The results show that Hossfeld can better describe the tree height curve of Abies fabri and Cunninghamia lanceolata,hyperbola can better describe the tree height curve of Pinus yunnanensis and Pinus armandii,Wykoff can better describe the tree height curve of Pinus kesiya var.langbianensis.The coefficient of determination of the optimal tree height curve model of Pinus yunnanensis is 0.676,and the coefficient of determination of other conifer tree specieses are greater than 0.710,the independent sample data test shows that the optimal tree height curve model of each tree species has good applicability,and has a good prediction effect on the tree height of the main conifer tree species in Yunnan Province.

Key words: Yunnan Province, tree height curve, conifer species

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