Species and tree quality spatial distribution patterns and associations in Tuyen Quang, Vietnam

Khoa, P. V. and Hung, B. M. and Dell, B. and Vinh, N. K. and Chau, M. H. (2024) Species and tree quality spatial distribution patterns and associations in Tuyen Quang, Vietnam. Journal of Tropical Forest Science (JTFS) (Malaysia), 36 (2). pp. 237-251. ISSN 0128-1283

Spatial distribution patterns of trees are important keys to understanding forest structure and for proposing forest management solutions. Management of rainforests in Vietnam is constrained by a shortage of spatial forest data. Therefore, research was conducted in an upland secondary forest in Tuyen Quang, Vietnam to assess spatial distributions of species and quality levels, and associations between them. Tree diameter, height, coordinates and quality (good, medium and bad) were recorded in three one-hectare plots. Tree density ranged from 920–1050 trees ha⁻¹, and there were 61–69 species ha⁻¹. The highest percentages of good and bad trees were 25.1 and 42.9%, respectively. The habitat was determined as heterogeneous to homogeneous. The spatial distribution of all species and ecological important species was mostly random and clustered. Associations among ecological important species was mainly independent. Tree qualities were randomly distributed, but bad trees were more abundant in the understorey. Associations between tree qualities were mostly independent. The results on spatial distribution patterns and associations between species and qualities will be useful in helping to eliminate competition of trees in clusters, assist regeneration in gaps and determine options for reducing the frequency of bad trees in the future.

Full text available from: Official URL: https://jtfs.frim.gov.my/jtfs/article/view/2726/19...

Abstract

Spatial distribution patterns of trees are important keys to understanding forest structure and for proposing forest management solutions. Management of rainforests in Vietnam is constrained by a shortage of spatial forest data. Therefore, research was conducted in an upland secondary forest in Tuyen Quang, Vietnam to assess spatial distributions of species and quality levels, and associations between them. Tree diameter, height, coordinates and quality (good, medium and bad) were recorded in three one-hectare plots. Tree density ranged from 920–1050 trees ha⁻¹, and there were 61–69 species ha⁻¹. The highest percentages of good and bad trees were 25.1 and 42.9%, respectively. The habitat was determined as heterogeneous to homogeneous. The spatial distribution of all species and ecological important species was mostly random and clustered. Associations among ecological important species was mainly independent. Tree qualities were randomly distributed, but bad trees were more abundant in the understorey. Associations between tree qualities were mostly independent. The results on spatial distribution patterns and associations between species and qualities will be useful in helping to eliminate competition of trees in clusters, assist regeneration in gaps and determine options for reducing the frequency of bad trees in the future.

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Item Type:	Article
AGROVOC Term:	trees
AGROVOC Term:	forests
AGROVOC Term:	species
AGROVOC Term:	forest management
AGROVOC Term:	spatial analysis
AGROVOC Term:	secondary forests
AGROVOC Term:	Exopalaemon vietnamicus
AGROVOC Term:	spatial distribution
AGROVOC Term:	tree height
Geographical Term:	Vietnam
Depositing User:	Ms. Azariah Hashim
Date Deposited:	02 Mar 2026 02:55
Last Modified:	02 Mar 2026 02:55
URI:	http://webagris.upm.edu.my/id/eprint/3418

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