Spatial Structure Characteristics of Betula platyphylla Secondary Forest in Daxing'anling of Inner Mongolia

doi:10.13466/j.cnki.lyzygl.2021.05.011

Abstract

Abstract:

The spatial structure of Betula platyphylla secondary young and middle aged forest in Daxing'anling,Inner Mongolia,was analyzed,which provided a scientific reference for the scientific management and function improvement of natural secondary young and middle aged forest in Daxing'anling.Taking the Betula platyphylla secondary young and middle aged forest as the research object,the spatial structure characteristics of Betula platyphylla secondary forest were analyzed by using single distribution and binary distribution based on the calculations of uniform angle index,dominance and mingling.The results showed that:In terms of single distribution,three plots were randomly distributed;the random distribution of trees accounted for 51%~59%.The mean dominance of Betula platyphylla in three plots were 0.481,0.521 and 0.466,respectively;and the growth of whole stand was in the moderate state.Three plots were weakly mixed with low stand heterogeneity,and the mingling degrees were 0.175,0.131 and 0.183,respectively.In terms of binary distribution,there were more inferior trees distributed in cluster state.While in random state,there were very few trees with high mingling,and more oppressed trees with low mingling distributed.There were some problems in Betula platyphylla secondary young and middle aged forest in Daxing'anling,Inner Mongolia,such as cluster distribution of some trees and low mingling degree of tree species.It was necessary to adjust the stand spatial structure through measures and to improve the mingling and maintain the healthy and stable development of forest ecosystem.

Key words: Daxing'anling, Betula platyphylla, secondary forest, spatial structure, binary distribution

CLC Number:

ZHANG Xianglong, WANG Bing, ZHANG Qiuliang. Spatial Structure Characteristics of Betula platyphylla Secondary Forest in Daxing'anling of Inner Mongolia[J]. FOREST RESOURCES WANAGEMENT, 2021, (5): 80-86.

Figures/Tables 7

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样地号	地理坐标	树种组成	林龄 /a	株数密度株 /hm²	坡度 /(°)	海拔 /m	平均胸径 /cm	平均树高 /m	郁闭度
1	50°54'36.154″N,121°32'20.536″E	9白1落	46	1000	2	969	13.17	16.84	0.76
2	50°54'19.892″N,121°32'19.513″E	8白2落	28	2877	2	740	9.26	11.14	0.64
3	50°54'36.731″N,121°32'20.880″E	9白1落	47	889	2	972	17.43	16.67	0.64

样地号	混交度	混交程度	大小比数	分化程度	角尺度	分布类型
1	0.175	弱度混交	0.481	亚优势向中庸过渡	0.531	团状分布
2	0.131	弱度混交	0.521	中庸向劣汰过渡	0.579	团状分布
3	0.183	弱度混交	0.466	亚优势向中庸过渡	0.457	均匀分布

样地号	混交度	大小比数	角尺度	林分空间结构指数	林分空间结构距离
1	0.175	0.481	0.531	0.440	0.955
2	0.131	0.521	0.579	0.375	1.016
3	0.183	0.466	0.457	0.447	0.942