Analysis on Spatial Distribution Pattern of Diameter-class Structure for Natural Picea crassifolia Forest Stand in Qilian Mountains

Abstract

Abstract: Analysis has been made on the distribution of diameter class structure of trees in 24 permanent sample plots of Picea crassifolia at the eastern section of Qilian Mountains.The followings are the results we have concluded.The small diameter trees (6～12cm) of natural Picea crassifolia forest Stand in Qilian Mountains occupy a big proportion,but the large diameter trees (26～36cm)and the larger diameter trees(≥38cm)occupy a small proportion.The distribution of diameter class structure of trees shows irregular shape in sample plots with low altitude or density.With the increase of altitude and density,the proportion of the small diameter trees in general is gradually increasing,the proportion of the large diameter trees and the larger diameter trees decreases gradually.Forest tree diameter class structure shows a reverse J-type distribution.Using a linear function fitting on tree diameter class distribution,it has been showed that the cubic function well fits the forest tree diameter class structure and the curve is the J-type.The correlation coefficients between tree average DBH and density is-0.513,which has showed significant negative correlation and the correlation coefficient between average DBH and altitude is 0.018,the correlation is not obvious.

Key words: Picea crassifolia, diameter class of trees, altitude, density, spatial distribution

CLC Number:

Q948
S758.5

WANG Mei, DA Guangwen, WANG Yingcheng, XU Kaisheng, ZHU Jinyu, ZHOU Guangjun, LI Jianghai. Analysis on Spatial Distribution Pattern of Diameter-class Structure for Natural Picea crassifolia Forest Stand in Qilian Mountains[J]. FOREST RESOURCES WANAGEMENT, 2013, (6): 127-132.

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