Spatial Structure of the Dominant Tree Species in an Evergreen Broadleaved Forest Stand in South Vietnam

Nguyen, Quy V.; Pham, Mai Phuong; Meng, Li; Bui, H. M.; Pham, Ha T.; Nguyen, H.; Nguyen, Tuan T.; Kang, Yong-Xiang

doi:10.1134/s1062359022130131

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Later-coming populations are at a disadvantage in the stand (U > 0.5), especially those near stumps and control center trees (Figure 7f), which underscores the fact that both strong light and excessive shading are detrimental to tree growth. The dominance of later-coming populations is remarkably different from the balanced differentiation observed in natural forests [67,68]. A balanced differentiation occurs earlier than a high mixture and random distribution, both of which require a lengthy process [62].…”

Section: The Promotion Of Stable Structures In Later-coming Populatio...mentioning

confidence: 81%

Scale Effects of Individual Tree Thinning in Chinese Fir Plantations

Wei,

Li,

Bai

2024

Forests

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Thinning is a crucial approach to the near-natural conversion of plantations, contributing to the sustainability of forest management. However, over a rotation, the effects of thinning on tree growth, structure, and species diversity, as well as their scale-dependent outcomes, remain unclear. Ten years after conducting individual tree thinning in a Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) monoculture in southwest China, we analyzed the thinning effects within the influence zone (r = 0–2.5 m) centered around stumps and center trees. The results indicate that (1) individual tree thinning did not significantly promote the increment of diameter at breast height, volume, and biomass of Chinese fir. The four nearest Chinese fir around stumps and center trees were in a state of random distribution, high mixing, and dominance; (2) individual tree thinning significantly promoted the formation of species abundance and richness at r = 2–2.5 m. With increased scale, more species were found, leading to increased stability in diameter and species distribution. Linear and nonlinear relationships between diameter classes, mingling, and dominance became more stable; (3) later-coming populations within both modes exhibited a common characteristic of random distribution, high mixing, and disadvantage at each scale, but with significant differences in species composition (kj = 0.22–0.61). These results suggest that individual tree thinning has limited impacts on the growth and structure of retained trees in Chinese fir plantations but significantly enhances the formation of species diversity, demonstrating scale effects. This underscores the feasibility of individual tree thinning in the near-natural conversion of plantations.

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Section: The Promotion Of Stable Structures In Later-coming Populatio...mentioning

confidence: 81%

Scale Effects of Individual Tree Thinning in Chinese Fir Plantations

Wei,

Li,

Bai

2024

Forests

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“…The study area harbors a diverse array of broadleaved species. According to Quy et al's report, the dominant tree species in this area consist of Knema pierrei Warb., Syzygium cumini (L.) Skeels, Garcinia celebica L., Arytera littoralis Blume, Diospyros silvatica Roxb., Pterospermum lanceifolium Roxb., and Xerospermum glabrum Pierre [29].…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic diversity patterns of woody species across different tree sizes and spatial scales in a tropical forest community on Con Dao Islands

Quy,

Manh,

Thanh

et al. 2024

JVNUF

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Understanding the maintenance of diversity and the assembly of communities is a primary concern in community ecology. This study explored the phylogenetic structure of an evergreen broadleaved tree community in Con Dao National Park, Vietnam. The survey, conducted in December 2023, encompassed all tree individuals with a diameter at breast height (DBH) ≥ 2.5 cm within a 4-ha study plot. These individuals were identified by species name, and their DBH was measured. Subsequently, a community phylogenetic tree was constructed using the Phylomatic online platform. The 4-ha study plot was subdivided into there different subplots based on three spatial scales (25 m × 25 m, 50 m × 50 m, and 100 m × 100 m) and all trees were classified into three different DBH classes (2.5 cm ≤ DBH < 10 cm representing small trees; 10 cm ≤ DBH < 20 cm as medium trees; and DBH ≥ 20 cm as large trees). The net relatedness index (NRI) and net nearest taxon index (NTI) were utilized to evaluate the phylogenetic structure and infer ecological processes. Our findings revealed a consistent decrease in both NRI and NTI with increasing spatial scales and tree sizes. These results suggest an overdispersed phylogenetic structure within the community across different spatial scales and tree sizes. Additionally, negative density dependence was found to have a pronounced effect on the phylogenetic structure, with a more significant impact on tree individuals from small and medium DBH classes than large ones. This study underscores the significance of phylogenetic density dependence as a primary mechanism governing species diversity and shaping the community structure of evergreen broadleaved forests in Vietnam.

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