Study on the Target Tree Density of Phoebe Bournei Plantation Based on Competition Relationship of Forest Trees

doi:10.13466/j.cnki.lyzygl.2017.04.007

Abstract

Abstract:

In order to cultivate precious tree species of large diameter timber,the key is to manage Phoebe Bournei artificial pure forest and to determine the target tree density so that it can be beneficial to the growth of the target trees and to give full play to the productivity of the forest.In Jindong Forest Farm,the representative of the 14 year old Phoebe Bournei plantation was selected,and three sample spots (20m*30m) were set.In these three sample spots,respectively,11,15 and 14 trees were selected as alternative target trees according to the target tree selection criteria based on near natural operation.ArcGIS was used to generate voronoi diagram according to the spatial position of forest trees.The competitive unit of each alternative target tree is determined based on the generated Voronoichart.And by determining the competitive unit the V-Hegyi competitive index and neighborhood comparison of each alternative target tree were calculated.V-Hegyi competitive index and the degree of neighborhood comparison are divided into 3 levels,according to the variation range of the V-Hegyi competition index and the neighborhood comparison degree.Trees with both indexes at the first level were determined to be final target trees.The number of target trees in these three sample spots would be 8,10 and 9 respectively.That is,the final target tree density was 120,150 and 135/hm² respectively.So the target tree density of the average of Phoebe Bournei in Jindong forest farm was 135/hm².This paper provides the theoretical basis for the near natural management of artificial pure Phoebe Bournei forest of Jindong Forest Farm.

Key words: Phoebe bournei, Voronoi diagram, competition relationship, target tree density

CLC Number:

S757

SHI Le, LI Jiping, ZHAO Chunyan, CHEN Lei, HUANG Xiao. Study on the Target Tree Density of Phoebe Bournei Plantation Based on Competition Relationship of Forest Trees[J]. FOREST RESOURCES WANAGEMENT, 2017, (4): 37-43.

Figures/Tables 6

Tab.1

Fig.1

Fig.2

Tab.2

V-Hegyi competition index and neighborhood comparison of alternative target trees in three plots

标准地号	树种	胸径 /cm	树高 /m	东西冠幅 /m	南北冠幅 /m	生活力	层次	起源	损伤	干形质量	V-Hegyi 竞争指数	大小比数
1	闽楠	12.7	9.5	4.7	5.3	1	2	1	1	1	3.31	0.00
1	闽楠	12.0	9.3	4.3	3.8	1	2	1	2	1	1.77	0.20
1	闽楠	12.5	11.2	3.0	2.7	2	2	1	1	2	2.67	0.33
1	闽楠	11.4	11.3	3.2	2.8	1	2	1	1	1	2.68	0.50
1	闽楠	11.8	10.8	3.2	3.6	1	2	1	1	1	1.86	0.25
1	闽楠	11.8	10.5	2.2	2.5	1	2	1	1	1	2.29	0.25
1	闽楠	10.9	10.5	5.2	5.5	1	2	1	1	1	2.36	0.50
1	闽楠	10.0	9.6	2.8	3.0	2	2	1	2	2	2.81	0.50
1	闽楠	13.1	10.0	4.0	2.8	1	2	1	1	1	3.67	0.30
1	闽楠	14.3	11.6	2.8	3.2	1	2	1	1	1	1.73	0.00
1	闽楠	12.0	9.0	3.0	3.8	2	2	1	2	2	1.43	0.20
2	闽楠	11.2	11.2	3.0	2.5	1	2	1	1	1	2.39	0.29
2	闽楠	12.3	11.2	3.8	4.2	1	2	1	1	1	1.78	0.00
2	闽楠	11.4	11.8	3.0	2.3	1	2	1	1	1	2.55	0.00
2	闽楠	12.0	8.3	4.0	3.7	1	2	1	1	1	2.27	0.00
2	闽楠	12.3	12.0	2.5	2.7	1	2	1	1	1	2.05	0.20
2	闽楠	13.0	11.0	3.7	4.2	1	2	1	1	1	2.16	0.00
2	闽楠	13.8	12.7	3.2	4.3	1	2	1	1	1	2.26	0.13
2	闽楠	12.6	12.5	3.3	3.5	1	2	1	1	1	2.24	0.20
2	闽楠	13.5	11.0	3.2	3.8	1	2	1	1	1	2.66	0.00
2	闽楠	12.2	8.0	2.2	3.4	2	2	1	2	2	1.97	0.00
2	闽楠	11.0	10.3	1.9	2.0	1	1	1	1	1	2.09	0.00
2	闽楠	12.5	8.6	1.8	2.7	1	1	1	1	1	2.16	0.33
2	闽楠	12.0	8.4	2.0	2.4	2	2	1	1	1	2.80	0.63
2	闽楠	11.5	8.5	3.0	2.2	1	2	1	1	1	3.70	0.50
2	闽楠	13.0	8.0	3.8	2.4	2	2	1	1	2	2.40	0.60
3	闽楠	11.5	9.5	4.0	4.2	1	2	1	1	1	3.35	0.00
3	闽楠	12.1	12.3	3.0	3.0	1	2	1	1	2	1.90	0.40
3	闽楠	15.6	11.5	2.8	4.0	2	2	1	1	1	3.03	0.33
3	闽楠	10.1	11.0	2.5	1.8	1	2	1	1	1	3.75	0.67
3	闽楠	11.0	9.2	2.5	2.8	1	1	1	2	1	2.23	0.50
3	闽楠	11.9	12.9	2.5	1.8	1	1	1	1	1	1.83	0.50
3	闽楠	11.2	11.3	1.7	2.0	1	1	1	1	1	2.99	0.86
3	闽楠	13.6	12.0	2.5	2.4	1	1	1	1	1	2.17	0.40
3	闽楠	11.0	8.5	2.5	2.6	1	1	1	2	1	2.64	0.33
3	闽楠	11.3	9.3	3.2	2.6	1	2	1	1	1	1.68	0.20
3	闽楠	12.2	9.8	2.8	3.2	1	2	1	1	2	2.22	0.40
3	闽楠	13.8	10.0	2.8	2.1	2	2	1	2	1	2.12	0.25
3	闽楠	12.3	9.5	2.2	2.5	1	2	1	1	1	1.72	0.60
3	闽楠	11.1	8.5	3.2	1.7	1	2	1	2	2	2.69	0.60

Tab.2

Tab.3

Tab.4

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标准地	坡度/( °)	坡向	坡位	郁闭度	平均胸径/cm	平均树高/m	株数密度/hm²
1	12	东坡	下坡	0.9	10.5	9.0	1867
2	14	东坡	下坡	0.9	9.9	8.9	2200
3	13	西北坡	中下坡	0.8	11.9	9.6	1700

林木指数	第1级	第2级	第3级
V-Hegyi竞争指数	≤2.20	(2.20-2.97)	≥2.97
大小比数	≤0.50	(0.50-0.75)	≥0.75