Research on the Difference of Mingling Degree under Different Selection Schemes of Adjacent Trees

doi:10.13466/j.cnki.lyzygl.2021.04.010

Abstract

Abstract:

In order to clarify the difference of stand mingling degree under different adjacent tree selection schemes,and find the evidence of which stand type is suitable for different adjacent tree selection schemes,this paper can provide reference for the research of stand spatial structure related issues.31 sample plots were set up in Longhu Mountain of South Dongting Lake area according to the types of aggregated distribution stand,random distribution stand,uniform distribution stand and sparse distribution stand.The methods based on "1+4" nearest adjacent trees,radius R(R=3.05 m) circle and Voronoi diagram were used to solve the number of adjacent trees per plot,the mingling degree of single tree and the average mingling degree of stand in various places,and explore the correlation between different schemes in different forest types.1) From the point of view of the overall stand average mingling degree,the average mingling degree values of the other stands in the experimental plots were not greatly different,except that the average mingling degree value of the adjacent trees based on the radius R(R=3.05 m) circle in the sparse distribution was low.2) From the point of view of individual tree,the mingling degree values of target trees in different stand types were different under different adjacent tree selection schemes.3) The correlation between "1+4" nearest adjacent tree and Voronoi diagram was relatively high in different stand types.Different selection schemes of adjacent trees had their own advantages under different stand types,but on the whole,the stability and accuracy of the adjacent selection schemes based on "1+4" nearest adjacent tree and Voronoi diagram were relatively high in solving mingling degrees of different stand types.

Key words: mingling degree, stand spatial structure, based on "1+4" nearest adjacent tree, Voronoi diagram, based on radius R circle

CLC Number:

S750

QING Dongsheng, ZHANG Jiang, LI Jianjun, PENG Jinxiang, LIU Shuai. Research on the Difference of Mingling Degree under Different Selection Schemes of Adjacent Trees[J]. FOREST RESOURCES WANAGEMENT, 2021, (4): 69-78.

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林分类型	编号	样地大小	株数/株	株密度/(株/hm²)
聚集分布	AM1	20m×20m	58	1450
	AM2		58	1450
	AM3		72	1800
	AM4		53	1325
	AM5		49	1225
	AM6		53	1325
	AM7		75	1875
	AM8		64	1600
	AM9		57	1425
随机分布	BM1	20m×20m	68	1700
	BM2		73	1825
	BM3		59	1475
	BM4		79	1975
	BM5		55	1375
	BM6		64	1600
	BM7		62	1550
	BM8		65	1625
	BM9	40m×40m	131	819
均匀分布	CM1	20m×20m	88	2200
	CM2	18m×25m	64	1422
	CM3	25m×25m	64	1024
	CM4	25m×25m	49	784
稀疏分布	DM1	20m×20m	33	825
	DM2	25m×25m	34	544
	DM3	50m×50m	72	288
	DM4	18m×20m	25	694
	DM5	100m×100m	429	429
	DM6	50m×50m	45	180
	DM7	20m×20m	36	900
	DM8	25m×25m	34	544
	DM9	60m×60m	46	128

方法名称	最少相邻木/株	最大相邻木/株	平均相邻木/株	最大混交度值	林分平均混交度值
基于“1+4”最邻近相邻木	4	4	4	1	0.56
基于半径R圆(R=3.05m)	0	20	7	1	0.58
基于Voronoi图	2	10	6	1	0.57

方法名称	最少相邻木/株	最大相邻木/株	平均相邻木/株	最大混交度值	林分平均混交度值
基于“1+4”最邻近相邻木	4	4	4	1	0.71
基于半径R圆(R=3.05)	0	13	4	1	0.68
基于Voronoi图	2	9	6	1	0.71

方法名称	最少相邻木/株	最大相邻木/株	平均相邻木/株	最大混交度值	林分平均混交度值
基于“1+4”最邻近相邻木	4	4	4	1	0.52
基于半径R圆(R=3.05m)	1	4	3	1	0.50
基于Voronoi图	1	6	5	1	0.53

方法名称	最少相邻木/株	最大相邻木/株	平均相邻木/株	最大混交度值	林分平均混交度值
基于“1+4”最邻近相邻木	4	4	4	1	0.62
基于半径R圆(R=3.05m)	0	5	1	1	0.44
基于Voronoi图	3	10	4	1	0.62