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FOREST RESOURCES WANAGEMENT ›› 2015›› Issue (1): 38-43.doi: 10.13466/j.cnki.lyzygl.2015.01.007

• Scientific Research • Previous Articles     Next Articles

In-growth Tree Number Model in Population Level Based on Continuous Forest Inventory

WU Yufeng1, GE Hongli1, ZOU Yiqiao2   

  1. 1.Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration,School of Environmental & Resource Sciences,Zhejiang A & F University,Lin' an, Zhejiang 311300,China;
    2.Tiantai Forestry Bureau,Taizhou,Zhejiang 317200,China
  • Online:2015-02-28 Published:2020-12-01

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Abstract: In-growth plays an important role in forest growth.This paper proposes a new in-growth tree number model using data of the years of 1999 and 2004 of Continuous Forest Inventory(CFI)in Lin' an county,Zhejiang province,China.The model actually consists of two partsone is based on the relationship between the number of in-growth trees occurred during the period and the number of trees at the former time,the other is based on the relationship between the number of in-growth trees and the mean DBH at the former period of time. Then,the two parts are combined with the weights which were calculated with their R2s.The result shows that R2s of the two parts are 0.892 1 and 0.682 5 for modeling data,and 0.713 and 0.8077 for test data.The relative error of estimated number of in-growth trees of total plots in this period is 0.69%.This may prove that this model is suitable for projection of number of in-growth trees in the population level with which the model was developed.

Key words: In-growth, number of in-growth trees, fixed sample plot

CLC Number: