Species tree

The paper presents results on tree snails based on samples collected from various parts of Vietnam during the period of 2008–2022. As a result, 14 Amphidromus species were recorded, which increased the diversity of the genus in Vietnam to a total of 27 species. Four species were new country records including Amphidromus atricallosus perakensis, Amphidromus leucoxanthus, Amphidromus perversus natunensis, and Amphidromus areolabiatus. Almost all 14 species were found in the south, while only Amphidromus roseolabiatus was recorded in the north.

19p dianmotminh02 03-05-2024 2 1   Download

The result has recorded 29 species of bamboo belonging to 15 genera. The Bambusoideae grow naturally in almost all regions, in an altitudinal range that extends from 200 m up to 2,160 m. Bamboo in the Central Highlands is distributed in three vegetation types: degraded natural forests in valleys and mountain gorges, along rivers (twenty-one species); primary forest, mixed with broadleaved trees (six species); and dry dipterocarp forest (two species).

16p dianmotminh02 03-05-2024 2 1   Download

Reconstructing phylogenetic trees from protein sequences normally requires empirical amino acid substitution models to calculate the likelihood of trees or genetic distances between species. The tree of life is classified into three domains of Eukaryotes, Archaea, and Bacteria. The amino acid substitution models have been intensively studied for decades, but few are related to Bacteria. Rooting bacterial trees remains a challenging problem in the phylogenetic analysis due to the long branch separating Bacteria and other domains.

14p dianmotminh02 03-05-2024 4 2   Download

Da Xanh pomelo (Citrus maxima) is a fruit tree with many nutrients and high economic value. However, nematode attacks are one of the factors that limit productivity. The aim of this study was to investigate and identify the species composition of parasitic nematodes on Da Xanh pomelos tree in the study area, thereby assessing their prevalence and impact on the health and productivity of the pomelo trees.

10p vioraclene 01-04-2024 2 0   Download

Spatial patterns of forest trees have been long recognized as evidences of underlying biological processes within forests. We used point pattern analysis methods and process-based models to detect the demography and dynamics of trees in a primary rainforest stand. A fully mapped 1-ha plot was investigated in the tropical rain forest of Cuc Phuong National Park. Trees were stem-mapped, diameter-measured at breast height and classified into species.

13p vilarry 01-04-2024 3 0   Download

Cinnamomum balansae is an endemic, rare species of tree in Vietnam, was rated level EN by IUCN, VU by the Vietnam Red Book – 2007 and classified as group IIA by Decree 32/2006/NĐ-CP. Besides its natural regeneration capacity is very limited so conservation and development for this species are facing a big challenge of seedling shortages.

7p vilarry 01-04-2024 4 1   Download

In this study, species richness, the Shannon-Wiener, Simpson indices, and the diversity profile are computed to evaluate and compare the diversity of the tree species in the four study sites.

10p vilarry 01-04-2024 5 1   Download

This paper will describe and compare tree species composition, forest structure and species diversity in order to determine the variation of tropical forest characteristics of tropical evergreen forests in three eco-geographical zones in North and Central Vietnam.

8p vilarry 01-04-2024 3 1   Download

Spatial association and species diversity of species-rich tropical forests can be characterized by their spatial patterns. We applied the quantitative analyses based on relationships of spatial distribution of tree species. In a 2-ha plot of a tropical broadleaved forest stand in Kon Ha Nung, Gia Lai province, all tree individuals with DBH ≥ 2.5 cm were mapped and their characteristics (i.e., DBH and species) were recorded.

9p vilarry 01-04-2024 8 0   Download

In this study, our overall goal is to characterize spatial attributes of neighborhood trees by applying the current techniques of nearest neighbor statistics. For a better understanding of structural units, we three structural units for each species analyses, such as mingling - index, mingling - dominance and dominance uniform angle index.

10p vilarry 01-04-2024 6 1   Download

Structural and spatial patterns of tree species in forests are important indicators to explain which underlying mechanisms or processes regulating forest structure. In this article, techniques of spatial point pattern analysis were used to characterize structural and spatial patterns of two secondary rain forest stands in Cuc phuong National park, Vietnam.

9p vilarry 01-04-2024 6 1   Download

Ebook "Invasive forest insects, introduced forest trees, and altered ecosystems: Ecological pest management in global forests of a changing world" demand for timber and fibber continues to grow and is being met by increased reliance on plantation forestry. Many of the plantations that are being grown around the globe are non-native species that have characteristics of rapid growth and good commercial qualities.

188p tachieuhoa 28-01-2024 4 2   Download

Ebook "Carbon sequestration potential of agroforestry systems: Opportunities and challenges" focuses on the role of multispecies production systems involving tree and crop species as a means for carbon sequestration and thereby reduce atmospheric carbon dioxide levels.

317p tachieuhoa 28-01-2024 5 2   Download

The results of early growths assessment of the Gao vang experimental planting area at the stage 7 year old and the selection of plus trees for big timber plantations show that the average growths in diameter at breast height, crown diameter, total height and trunk volume of plus trees (TG) reached a value of 16.74 cm; 5.24m; 10.74m; and 118.20 dm3 per tree, respectively, exceeding the accompanying forest tree group (ĐR) of 1.60; 1.02; 1.15; and 2.82 times, respectively, under the same comparison criteria, environmental conditions and time.

8p vikissinger 21-12-2023 3 1   Download

The spatial structure of a community and the ecological mechanisms that control it are central themes in community ecology. This study aimed to investigate the ecological mechanisms driving the coexistence of tree species in the evergreen broadleaved forests in Con Dao National Park, Vietnam.

10p vikissinger 21-12-2023 2 1   Download

All species within a community either directly or indirectly interact with each other. Such interactions serve as the nucleus of both ecological and evolutionary processes. This study focused on dominant tree species' interspecific associations and the stability of evergreen broadleaved forest stands in Phu Quoc National Park in Kien Giang province of Vietnam.

10p vikissinger 21-12-2023 3 1   Download

This study aimed to analyze the floral attributes of Dong Thap Muoi Nature Reserve in Tien Giang province. Findings revealed the presence of 136 vascular plant species spanning 113 genera and 53 families within the Polypodiophyta and Angiospermatophyta phyla.

10p vikissinger 21-12-2023 1 1   Download

Part 2 book "Parasites and infectious disease" includes content: The discovery of ivermectin - A crapshoot or not, you came a long way to see a tree, infectious disease and modern epidemiology, the unholy trinity and the geohelminths - An intractable problem, the spadefoot toad and Pseudodiplorchis americanus - An amazing story of two very aquatic species in a very dry land,... and other contents.

181p muasambanhan01 13-12-2023 7 5   Download

The results of the growths and development of Nauclea orientalis species from the experimental planting model for big timber production in Hoa Binh province showed that, Nauclea orientalis trees have been adapted, growth quite well on the sites at the age of 16 months in Hoa Binh province.

7p vispacex 16-11-2023 6 2   Download

In this study, we aim to assess the relationships of the taxonomic attributes (such as species richness and diversity, community composition) and structural attributes (such as diameter, height, volume and above ground biomass) of the three major forest types in Phou Khao Khouay National Park of Laos.

11p vispacex 16-11-2023 2 2   Download