Importance Value Index Research Articles

Characterization of weed flora in a cassava crop in Tabasco

Objective: To evaluate the effect of the incorporation of Crotalaria juncea L. as green manure on the weed community in a cassava crop in Tabasco. Design/methodology/approach: The study was carried out in the Experimental Field of Colegio de Postgraduados, Campus Tabasco (18º01' N and 93º03' W). The samplings were made on four dates: 1) at the planting of crotalaria (12/03/2018); 2) at flowering (31/01/2019); 3) 20 days after incorporation (22/02/2019); 4) at cassava harvest (25/04/2019), using metal squares 50 x 50 cm. Two planting densities, 50 and 80 cm (16,600 and 10,375 plants ha-1), two doses of NPK fertilization (160-40-80 and 00-40-80+GM), and a control were tested. The name of the species, number of individuals and coverage (percentage) were recorded to calculate the richness (S), Shannon diversity (H') and uniformity (E) indices, and the importance value index (IVI). Results: The weed community consisted of 32 species, 28 genera and 16 families, of which the best represented are: Convolvulaceae, Asteraceae, Cyperaceae and Poaceae. The most frequently recorded species are Lindernia crustacea, Ludwigia octovalvis, and Ageratum houstonianum. The diversity indices reflected a poor community, especially with GM treatments; diversity ranged from low to medium and uniformity from medium to high. The importance of the families was more related to the environmental conditions than to the treatments; Cyperaceae were more important in the rainy season and Asteraceae in the dry season. L. crustacea appeared throughout the cycle. Limitations/implications: It is advisable to extend the investigation period. Findings/conclusions: The weed flora consisted of 32 species; the Convolvulaceae family was the most diverse and L. crustacea was the most recorded species during the cycle. The diversity indices reflected a poor community. The importance of the families was related to environmental conditions, where Cyperaceae stood out in the rainy season and Asteraceae in the dry season

Dermaptera Community Structure on Oil Palm Ecosystem in Dharmasraya District, Indonesia

The oil palm ecosystem is one of the suitable habitats for the order Dermaptera. Several physical factors, especially humidity in the oil palm ecosystem, support these insects' existence. In the oil palm ecosystem, Dermaptera has several functions, including as a predator of oil palm pests, but on the other hand, these insects also prey on Elaeidobius kamerunicus Faust, the primary pollinator of oil palm plants. For that reason, research was conducted to study the structure of the Dermaptera community in the ecosystem of oil palm plantations in the Sitiung sub-district. This research was a survey conducted at three locations- Sitiung, Gunung Medan, and Sungai Duo Villages—the collection of insect samples by hand collection. Identification of insect samples was carried out at the species level according to Burr (1910) and Borror et al. (1996). In this study, 214 individuals of the order Dermaptera were found to consist of three species: Cheslisoches mario, Forficula auricularia, and Vostox brunneipennis. C. mario was the dominant Dermaptera species found with an Importance Value Index (IVI) was 1.27. Based on this research, it is known that the community structure of the order Dermaptera was simple because it has low diversity values.

Structural diversity and carbon stocks in a tropical semi-evergreen forest in Bangladesh

Tropical forests are well-known as highly productive terrestrial ecosystems, which contribute significantly to the global carbon (C) cycle. Studies indicate a correlation between the structural diversity of forests and carbon stocks in the overall forest carbon stocks, and this relationship varies across tropical ecosystems. Understanding this connection is crucial to preventing the transfer of threats to unprotected areas when safeguarding specific forests. The present study was conducted in the undisturbed natural forests of Rema Kalenga Wildlife Sanctuary, Habigonj, Bangladesh. The study aimed to estimate C stocks within the soil-vegetation system of this forest ecosystem and elucidate relationships with stand structural diversity, focusing on vertical stratification and spatial association of tree species. Stand-level C stock models, constructed through tree-level carbon stocks using allometric equations, were based on stand variables such as basal area and mean or dominant tree height. Results identified five canopy strata, with strata two and three accounting for 60% of C stocks. The importance value index of tree species demonstrated a significant association with the C stocks contribution of tree species. The total ecosystem carbon stock ranged from 185 to 220 Mg ha−1, with aboveground 103 to 132 Mg ha−1, belowground 21 to 26 Mg ha−1, litter 2.4 to 4.4 Mg ha−1, dead wood 0.5 to 4.9 Mg ha−1 and soil 11 to 44 Mg ha−1. Species diversity indices exhibited weaker relationships with C stocks, while Pielou's evenness index demonstrated a strong negative relationship (P < 0.05) to C stocks. This comprehensive assessment provides insights into the C dynamics of the forest ecosystem. It offers valuable information for policymakers devising climate change mitigation strategies through the conservation management of tropical forests as crucial C sinks.

Forest species diversity and community composition in the northern Western Ghats, India

ABSTRACT Background The northern Western Ghats (NWG) – a part of the Western Ghats and Sri Lanka biodiversity hotspot supports tropical forests of conservation priority, due to anthropogenic intensification. Woody species diversity and ecology in NWG is poorly studied, necessitating the knowledge of spatial variability in species and underlying environmental factors, for effective conservation. Aims We described woody plant community composition and related it to climate data across a latitude of 1.4 degrees to obtain information about spatial and environmental variation to support protected area planning. Methods To estimate abundance, importance value index, diversity indices and rank – abundance, we recorded woody species in 144 plots across 12 sites. Elevation, temperature, rainfall, humidity data were related to diversity descriptors in a canonical correspondence analysis. Results We recorded 10,291 trees representing 187 species of 52 families. Divergent geo-climatic factors were related to distinct plant community structures, elevation and humidity being the most influential drivers of plant diversity and density. Numerous rare species were found restricted to environmentally distinct forests. Conclusion The wide-ranging environment and corresponding variations in forest community composition across the narrow latitudinal range of the study area revealed the importance of including such gradients in planning future protected areas in the NWG.

Komposisi vegetasi pada Daerah Aliran Sungai Pangasi Kawasan Cagar Alam Pangi Binangga Kabupaten Parigi Moutong

This research aims to determine the types of plants and the Important Value Index in the Pangasi River Watershed (DAS) in the Pangi Binangga Nature Reserve. The method used in collecting data is the plot method or checkered path method with four growth levels, namely seedlings (20 m × 20 m), saplings (10 m × 10 m), poles (5 m × 5 m) and trees (2 m × 2 m). Data analysis used the Importance Value Index (INP), a method commonly used in ecological studies. INP analysis includes several parameters, namely relative density, relative frequency, and relative dominance. The results of field identification found 532 individuals with 19 species. Vegetation Analysis Results: Important Value Index at tree level is dominated by Bayur (Pterospermum spp), the pillar level is dominated by Ebony (Diospyros celebica bakh), at the stake level dominated by Pangi/Kepayang (Pangium to success) and at the pillar level dominated by Nyatoh (Palaquium obtusifolium). Results of INP calculations at tree, pole, sapling and seedling levels. In general, of the four growth levels, Nyatoh (Palaquium obtusifolium) is the most dominant plant in the Pangasi River Basin.

Floristic composition and species diversity at Gunung Inas forest reserve, Kedah, Peninsular Malaysia

Monoculture plantations such as Musang King durian farms on a big scale become a controversial issue due to its potential devastating impact to the diversity of forest reserves at some areas in Kedah including Gunung Inas Forest Reserve. This study intended to determine the floristic composition and species diversity at Gunung Inas Forest Reserve (GIFR), Kedah. Three plots of 70 m x 25 m covering 0.53 ha were established at GIFR. Each tree with diameter at breast height of 5 cm and above in the study plots were tagged, measured and identified up to species level. Voucher specimens were then taken for further identification purposes. The floristic composition of GIFR consists of 53 individuals represented by 16 species from 12 families. Anacardiaceae was the most speciose family with four species recorded. The most dominant species was Swintonia schwenkii (Anacardiaceae) with 14 tree individuals. S. schwenkii (Anacardiaceae) was considered to have an absolute dominance at the study site with Important Value Index (IVi) of 12.48%, meanwhile Myrtaceae recorded 20.87% of IVi, reflecting this family to be relatively dominant than other families. GIFR recorded moderate Shannon-Weiner Diversity index of H’ = 2.66 (H’max = 2.77) and Margalef’s Richness Index of DMG = 8.7. High Evenness Index of 0.71 portrayed that the tree species are almost equally abundant at the study area. The total tree biomass in the GIFR was estimated at 76.26 t/ha, contributed by 66.04 t/ha of above ground biomass and 10.22 t/ha below ground biomass. Data and information from this study can serve as a guideline for future ecological research and particularly in planning conservation efforts to ensure the biodiversity and sustainability of forests for future generations.

Species composition and mangrove forest structure in Buano Island, Moluccas

Mangrove forests are protected areas that play an important role for coastal communities on small islands. This study aims to convey data and information about the structure and composition of mangrove species on Buano Island. The Importance Value Index (INP) obtained from vegetation analysis is used as an indicator to describe the composition and structure of mangrove forests. The plot-assisted path method is used in vegetation analysis. 9 illustrative paths with a width of 200 m were created which were divided into 9 segments, there were 54 plots to obtain data and types of mangroves. The research results showed that there were 12 types of mangrove trees and forest regeneration (Heritiera littoralis, Rhizopora Mucronata, Rhizopora stylosa, Rhizopora apiculata, Ceriops Tagal, Sonneratia alba, Bruguiera gymnorrhiza, Lumnitzera racemose, Aegiceras corniculatum, Deriss trifoliata, Nypa fruticans, Xylocarpus granatum). The dominant species is R. mucronata. The vegetation structure at both locations also has a similar pattern the same, where the vertical structure has 2 layers/stratum of trees and both are dominated by trees with a height of 6-10 meters. Meanwhile, for the horizontal structure, the distribution of diameter classes at both locations is even, marked by a graph that forms an L curve.

Carbon Sequestration Potential of Agroforestry versus Adjoining Forests at Different Altitudes in the Garhwal Himalayas

Forests face a variety of threats in the modern era. Agroforestry systems, both traditional and introduced, have a tremendous capacity for providing sustainable resources and combating the impact of global climate change. Indigenous agroforestry and forest land-use systems are important reservoirs for biodiversity conservation and ecosystem services, providing a potential contribution to livelihood security for rural communities. This study aimed to assess the tree diversity and carbon stock of agroforestry and adjoining forests along altitudinal gradients, ranging between 700 and 2200 masl (i.e., lower, middle, and upper altitudes) by laying sample plots randomly of a size of 20 × 20 m2. In the forest land-use system, the maximum Importance Value Index (IVI) included Dalbergia sissoo (71.10), Pyrus pashia (76.78), and Pinus roxburghii (79.69) at the upper, middle, and lower elevations, respectively, whereas, in the agroforestry land-use system, the IVI reported for Ficus semicordata was 43.05 at the upper, while for Grewia optiva it was at 53.82 at the middle and 59.33 at the lower altitudes. The below-ground biomass density (AGBD) was recorded as 1023.48 t ha−1 (lower), 242.92 t ha−1 (middle), and 1099.35 t ha−1(upper), while in the agroforestry land-use system, the AGBD was 353.48 t ha−1 (lower), 404.32 t ha−1 (middle), and 373.23 t ha−1 (upper). The total carbon density (TCD) values recorded were 630.57, 167.32, and 784.00 t ha−1 in forest land-use systems, and 227.46, 343.23, and 252.47 in agroforestry land-use systems for lower, middle, and upper altitudes, respectively. The Margalef’s Index values for agroforestry and forests ranged from 2.39 to 2.85 and 1.12 to 1.30, respectively. Soil organic carbon (SOC) stock recorded 45.32, 58.92, and 51.13 Mg C ha−1 for agroforestry and 61.73, 42.65, and 71.08 Mg C ha−1 for forest in lower, middle and upper elevations, respectively. The study suggests that selecting land use patterns can be an effective management system for tree species at different elevations for carbon storage, helping to mitigate climate change and aiding in sustainable management of ecosystems in the Garhwal Himalayas.

Keanekaragaman jenis tumbuhan invasif di Kawasan Hutan Sillu Kabupaten Kupang

Background: Invasive plants are plants that grow and spread to areas outside their original habitat. Invasive plants invade many forest areas, tourist attractions, and vegetation in Indonesia. Invasive plants can affect the composition of native vegetation so that it can threaten biodiversity in an area. The purpose of this study was to determine the diversity of invasive plant species in the Sillu Forest Area, Kupang Regency. Methods: The research method used is systematic sampling method with the placement of measuring plots is a plot line. Findings: The area studied was 70.24 Ha with the sampling intensity used was 5% and the number of measuring plots was 88 measuring plots. The vegetation analysis carried out was Density, Relative Density, Frequency, Relative Frequency, Important Value Index (INP) and Species Diversity Index. Conclusion: The results showed that there were 8 species from 5 families of invasive plants in the study site, namely krinyuh (Chromolaena odorata (L.) R.King &amp; H. Rob), Ayam's Tahi Flower (L.). Rob, Bunga Tahi Ayam (Lantana camara L), Grinting grass (Cynodon dactylon), Jariji grass (Digitaria sanguinalis), Teki grass (Cyperus rotundus), Gala-gala (Amorpha fruticosa L), Ipomoea (Ipomoea indica (Burm.Merr) and Putri malu (Mimosa pundica L). The highest Index of Important Value is the type of Krinyuh (Chromolaena odorata (L.) R.King &amp; H.Rob which is 62% while the lowest Index of Important Value is the type of Putri malu (Mimosa pundica L) which is 2%. The value of Diversity Index of invasive plants with 0.7683, which is included in the low diversity category.

Analysis of Mangrove Vegetation in Lohgung Village, Brondong Sub-District, Lamongan Regency

Mangroves are vegetation that grows in muddy areas in tidal areas, coastal areas , and river estuaries. Mangrove forests have an ecological function as providing food for marine biota, preventing tidal waves and tsunamis, preventing sea water intrusion, preventing coastal erosion and absorbing waste. This research aims to determine the species and Importance Value Index in the mangrove area of Lohgung Village, Brondong District, Lamongan Regency, which included Relative Density (KR), Relative Frequency (FR), and Relative Dominance (DR). This research was carried out in Lohgung Village, Brondong District, Lamongan Regency from May to June 2023. The method used in sampling used a combination of the line method (line transect) and the plot line method (quadrant transect). The results showed that the types of vegetation found in Lohgung Village, Brondong District, Lamongan Regency consisted of 8 species from 5 different families, namely Sonneratia alba, Rhizophora apiculata, Rhizophora mucronata, Bruguiera gymnorrhiza, Ceriops tagal, Lumnitzera racemosa, Excoecaria agallocha L., and Xylocarpus moluccensis. The results of calculating the values of Density (K), Relative Density (KR), Frequency (F), Relative Frequency (FR), Dominance (D), Relative Dominance (DR), and Importance Value Index (IVI) in all categories, trees, saplings and seedlings showed that the highest value that dominated was Rhizophora mucronata with an IVI value of 102.08%, 68.73% for saplings and 75.40% for seedlings.

Tree Diversity and Its Ecological Importance Value in Silvopastoral Systems: A Study along Elevational Gradients in the Sumaco Biosphere Reserve, Ecuadorian Amazon

This study analyzes tree diversity and its ecological importance value in silvopastoral systems in the Sumaco Biosphere Reserve (SBR), Ecuador, along an altitudinal gradient of 400–2000 masl. Twenty-six plots distributed into low (400–700 masl), medium (701–1600 masl) and high (1601–2000 masl) zones were used. The Shannon index and the importance value index (IVI), based on abundance, dominance and relative frequency, were estimated. The results highlight that in pastures with dispersed trees, the richness of trees decreases with increasing altitude in the elevational gradient; they also show a higher tree density at lower altitudes in contrast to the Andean–Amazonian primary forests. The lower and middle zones showed higher diversity, linked to regeneration and the presence of nearby forests. Species of high commercial value, such as Cedrela odorata and Jacaranda copaia, were common, reflecting knowledge of the local timber market. In the lower and middle zones, the 10 most important species accounted for more than 70% of the trees, with up to 96% in the upper zone. A total of 51 taxa (including 42 species and nine taxa at the rank of genus) were identified, which were mostly native; 64.7% are classified by the IUCN as least-concern (LC) species, 31.4% as not evaluated (NE) species and 3.9% as vulnerable (VU) species, specifically highlighting Cedrela odorata and Cedrela montana. The study concludes with policy recommendations related to the importance of trees in silvopastoral systems for the conservation of species and the livelihoods of local communities, highlighting the need for responsible management of Amazonian pasturelands.

Eco-Engineering Mangrove Restoration at Gazi Bay, Kenya

Mangroves offer a range of globally acknowledged advantages, yet they continue to be lost and degraded. Efforts to restore lost mangroves using conventional techniques in high-energy areas result in low success rates due to the removal of seedlings via wave action. We assessed the efficacy of using modified Riley Encasement Methods in the restoration of mangroves in high-energy areas in Gazi Bay, Kenya. Vegetation and soil baseline data were collected in 49 square plots of 100 m2, which were established along belt transects perpendicular to the shoreline. The following mangrove vegetation data was collected: species composition, tree height (m), and stem diameter (cm). From these, the importance value index (IV), basal area, and standing density (stems/ha) were derived. Sediment cores were made in the center of each square plot for carbon and grain size analysis. Mangrove (Rhizophora mucronata) planting adopted a randomized complete block design (RCBD) in which the planting area was divided into three blocks (A, B, C). Within each block, treatments (bamboo and different-sized PVC pipes) were randomly assigned locations. The results of the study reveal significant variations in survival and growth rates among treatments. Higher survival rates were recorded for seedlings grown within PVC encasements (43%), surpassing bamboo (1%) and control groups (4%). Our findings suggest that PVC pipes were efficient in supporting and protecting seedlings from external forces. We expound on the implications of the results and highlight potential enhancements for the effectiveness of encasement technique in mangrove restoration.

Distribution pattern and management of invasive alien plant species in Sikkim Himalaya, India

An assessment of the distribution pattern of Invasive Alien Plant species in the Sikkim Himalayas was conducted at different elevation gradients and accordingly, management strategies were recommended to combat the ever-increasing condition of invasive plant species threatening the sensitive ecoregions. Among the most relevant factors supporting the present study were changes in the importance value index (IVI), variety, and evenness. There is a greater percentage of domination of invasion at lower elevations than at higher elevations. Species diversity, dominance, and evenness values decreased significantly at higher elevations; interestingly, the fraction of invaded regions is lower at higher elevations. Several factors may contribute to the large cover of invasive plants at lower elevations, including the enabling climate and anthropogenic activities. As a result of invasive alien plant species, such as Ageratum conyzoides, Ageratina adenophora, Bidens pilosa, Chromolaena odorata, Lantana camara, Mikania micrantha and Parthenium hysterophorus, native vegetation, and fauna may suffer adverse consequences, as well as socioeconomic conditions and health issues. This study determined that the invasion of these invasive alien plants in different elevations in the Sikkim Himalaya impacts ecosystem services and depletes several species of commercial importance. The current study recommends quick action to control harmful invasive alien plant species in the Sikkim Himalaya

Composition and diversity of woody plant species in agro-ecosystems of Uluguru Mountains, Tanzania

Woody plant species are important components of agro-ecosystems that determine their productivity and biodiversity conservation in tropical mountain landscapes. This study investigates woody plant species composition and diversity through simple random sampling of sixty (10 × 10 m) plots in crop fields, hedgerows, and homegardens at Uluguru Mountains, Morogoro, Tanzania. In total, 85 woody plant species, representing 82 genera and 40 families were recorded. The most species-rich families were Proteaceae (with 323 individuals), Lauraceae (205), and Meliaceae (185). Among the woody plant species, Grevillea robusta (Proteaceae) showed the highest importance value index of 41% across different agro-ecosystem types. Shannon (1.87), Simpson (0.82), and evenness (0.91) diversity indices were highest in hedgerows compared to other agro-ecosystems. Hedgerows recorded the maximum richness, followed by homegardens and lastly crop fields. Present agro-ecosystems should be promoted to enhance the restoration and conservation of agro-biodiversity in mountain landscapes.

FLORISTIC AND PHYTOSOCIOLOGICAL COMPOSITION OF THE SQUARES IN THE CITY OF SANTARÉM, PARÁ

The vegetation composition in green areas plays an important role in obtaining ecosystem benefits within these spaces. Therefore, this research aimed to characterize the floristic and phytosociological composition of the tree canopy in the squares of Santarém, Pará. To achieve this, a floristic survey was conducted in 38 squares, considering trees with a height greater than 1.5 m. Taxonomic and phytogeographical information of the trees was identified, and phytosociological parameters such as frequency (AF and RF), density (AD and RD), dominance (ADo and ADr), cover value index (CVI), importance value index (IVI), and Shannon-Wiener diversity index (H') were evaluated. A total of 686 trees were identified, with 54.60% of them being native species of Brazil and 45.40% exotic to the country. The Fabaceae family stood out with the highest number of species (19), while Anacardiaceae had the highest number of individuals (219). The species with the highest Af and Rf were Mangifera indica (78.95 - 14.71%) and Moquilea tomentosa (43.74 - 8.33%), and for Da and Dr, Mangifera indica (10.51 - 27.16 ind/ha) and Azadirachta indica (4.72 - 12.21 ind/ha) were prominent. In terms of DoA and DoR, Mangifera indica (7.85 - 48.48 m2/ha) and Spondias mombin (1.67-10.32 m2/ha) were highlighted. In IVI, M. indica also stood out (90.34%). The overall H' for the squares was 2.85, with Parque da Cidade (2.85) and Jati (2.23) squares being the most prominent. Only two squares showed moderate to high diversity (H' &gt; 2.22). The floristic composition is predominantly composed of exotic individuals (54.60%), especially the species M. indica.

KEANEKARAGAMAN JENIS TUMBUHAN BAWAH BERPOTENSI OBAT DI KAWASAN GUNUNG TILU KABUPATEN KUNINGAN JAWA BARAT

Undergrowth is a type of basic vegetation found under forest stands except for forest tree regeneration, which includes grasses, herbs and shrubs. Undergrowth plants have a primary function in conserving soil and water. This is because the undergrowth has a large root system that produces dense clumps and is able to prevent soil erosion, as a protector of the soil from raindrops and runoff, also plays a role in increasing organic matter in the soil as green manure and mulch. Utilization of undergrowth plants as a source of medicines has an important role and is an alternative for the community to maintain health and treat a disease. The purpose of this study was to determine the diversity of undergrowth plants and to identify undergrowth plants with medicinal potential as a source of information for the community and area managers. The method used is the transect method/checkered line. Sampling plots were taken in 3 routes, namely the Citambelang, Ebeg-ebeg, and Bakukung routes. Each path consists of 9 sample plots. The results of the undergrowth inventory were then calculated the Important Value Index (IVI) and Species Diversity Index (H' The results showed that there were 44 types of undergrowth found in the Gunung Tilu area from 31 families with a total of 668 individuals. The largest IVI was found in cakar ayam (Selaginella doerderleinii) with a value of 22.64 and the smallest IVI was for kemukus (Piper cubeba) and meniran (Phyllanthus urinaria) with a value of 0.88. For undergrowth plants that have medicinal potential, 28 species from 23 families and 521 individuals were found. The diversity index in undergrowth in the Mount Tilu area is categorized as low with an index value (H'&lt;1) which is 0.32. This information is very important for future management of the Mount Tilu forest area.

Biodiversity and Structural Analysis of Woody Plant Species of Home Gardens in Basona Worana District, North Shoa Zone of Central Ethiopia.

The purpose of this study was to investigate the biodiversity and structure of woody plants of HGs in the Basona Worana district (BWD). For this, six kebeles and 138 HGs from three agroecologies of BWD were selected using various sampling techniques. The plot size used per HG was 400 m2. Diversity and important value indices (IVIs) were computed. For their structural analysis, the diameter at breast height (DBH) and height were also measured for trees and shrubs fulfilling the standards (diameters at breast height (DBH) ≥2.5 cm and height >2 m). Thus, a total of 42 woody species belonging to 37 genera and 26 families were identified. Fabaceae was the most abundant family, followed by Euphorbiaceae. Trees were the dominant habit. The richness in Kola HGs (33) was higher than Dega (14) and Woinadega (19) HGs, with an overall mean richness of 4.14 per HG of BWD. The Shannon, Simpson, and evenness indices for HGs in the district were 1.05, 0.55, and 0.75, respectively, showing their moderate diversity with even distribution. The Sorenson's similarity of HGs between Dega and Woinadega, Kola and Dega, and Kola and Woinadega were 40%, 28%, and 32%, respectively. The multiple site similarities of woody species among three ecological zones (36%) were still <50%, showing no similarity. The overall DBH and height classes' patterns of the woody species individuals abruptly decreased towards their highest classes. Similar DBH and height classes' patterns of woody species individuals were also observed in Kola and Woinadega agroecologies, indicating their selective tree cutting. The mean values of DBH, height, basal, and crown areas of the woody species in the district were ∼14 cm, ∼6 m, ∼29 m2·ha-1, and 5 m2, respectively. Based on IVI, most of the HGs were dominated by Eucalyptus globules (93.35), followed by Eucalyptus camaldulensis (45.04), Rhamnus prinoides (22.4), and Cupressus lusitanica (22.33). Hence, actions should be taken to promote the diversity and managing of HGs' woody species of BWD.

Structure and distribution of palm tree species in Altingia excelsa planted forest in Gunung Gede Pangrango National Park, West Java, Indonesia

Abstract. Sadili A, Salamah A, Mirmanto E, Kartawinata K. 2024. Structure and distribution of palm tree species in Altingia excelsa planted forest in Gunung Gede Pangrango National Park, West Java, Indonesia. Biodiversitas 25: 249-256. Gunung Gede Pangrango National Park (GGPNP) is a conservation area consisted of natural forest and planted forest, including Altingia excelsa Noronha stands which were planted in 1925. As a result of secondary succession, various plants grow under Altingia excelsa stands, including palm tree species (Arecaceae). This research was conducted to determine the structure, population, and distribution patterns of palm trees in Altingia excelsa planted forest in Bodogol Resort, GGPNP. The data were collected by establishing a one-hectare plot divided into 100 subplots of 10 m × 10 m. Palm tree species with a Diameter at Breast Height (DBH) ?3 cm were measured, and the tree heights were estimated. Data analysis included Relative Dominance (RDo), Relative Density (RDen), Relative Frequency (RF), Importance Value Index (IVI), Shannon Wiener Diversity Index (H'), Evenness Index (E), Index of Dispersion (ID), analysis of variance values (S2) and Chi-square analysis (Q). The study results recorded four species from three genera of Arecaceae which consisted of 171 trees with a total Basal Area (BA) of 0.63 m2/ha. Pinanga coronata (Blume ex Mart.) Blume was the most dominant palm tree species with IVI of 156.89%), followed by Pinanga sp. (IVI=72.04%), Caryota rumphiana Mart. (IVI=55.77%), and Arenga pinnata (Wurmb) Merr. (IVI=15.38%). In term of diameter class distribution, Pinanga coronata and Pinanga sp. were regenerating well. Spatial distribution patterns of Arenga pinnata, Caryota rumphiana, and Pinanga sp. were regular, while Pinanga coronata was clustered. Periodical studies in the future to determine the mortality and natality of the palm trees are recommended to understand the dynamics of vegetation succession.

KEANEKARAGAMAN JENIS ANGGREK DI JALUR PENDAKIAN WIRAYANA GUNUNG CAKRABUANA KABUPATEN MAJALENGKA

The existence of orchids in nature continues to decline due to habitat destruction and overexploitation. Conservation efforts that have been carried out so far have often experienced difficulties due to insufficient data and information as a basis for management, including conservation areas. The more widespread forest destruction will result in these species being threatened with extinction. This study aims to determine the diversity of orchid species, on the Wirayana Mount Cakrabuana Climbing Path. The information is expected to provide an initial contribution to the area management and orchid conservation efforts on the Wirayana Mount Cakrabuana Climbing Path. This research was conducted by means of a vegetation survey, sampling and documentation by exploring the existence of orchids. The sampling technique used the path transect method. The number of transects used is one line transect with a line length of 1500 m with a total of 22 sample plots. Data analysis was carried out by calculating the Important Value Index (INP), Species Dominance Index (Di) and Species Diversity Index (H'). The results showed that in the natural forest area of ​​Mount Cakrabuana there were 22 species of individuals which included 7 species of terrestrial orchids and 15 species of epiphytic orchids with a total of 243 individuals found. From the results of the calculation of species diversity, it is stated that the diversity of orchid species in the natural forest area of ​​Mount Cakrabuana is classified as moderate (2,973). This information is very important, especially for area managers in preserving the biodiversity of Mount Cakrabuana, especially orchids in the future.

Tree Vegetation Diversity In The Natural Reserve Of Jagat Mountain Sumedang

Mount Jagat is a 133.64-hectare nature reserve area that is directly adjacent to the village and community agricultural land. The designation and management of nature reserves aim to conserve biodiversity, prevent species extinction, protect the forest as a life-support system, and sustainably utilize biodiversity. The threats posed by anthropogenic activities in the Mount Jagat area indicate the need for an inventory and analysis of species diversity, especially tree vegetation, as a first step for conservation. Data collection was carried out using nested quadrats which were placed systematically based on the Land Mapping Unit (LMU). The quadrats were 20 m x 20 m for trees, 10 m x 10 m for poles, 5 m x 5 m for saplings, and 2 m x 2 m for seedlings. The data were then analyzed using Family Importance Value (FIV), Importance Value Index (IVI), Shannon's Diversity Index (H'), and global conservation status by the International Union for Conservation of Nature (IUCN). There are 78 species from 32 families found in the study area. The results showed that the highest FIV for trees was the Moraceae family, 15.43%. The highest FIV for polishes and saplings were in the family Euphorbiaceae with 20.65% and 23.60% respectively. The highest FIV at the seedlings level was the Lauraceae family at 28.47%. Two species were found that had IVI above 10% in almost every growth stage, namely Machilus rimosa (Blume) Blume. and Orophea hexandra Blume. Machilus rimosa (Blume) Blume. found at the tree, pole, sapling, and seedling levels. Orophea hexandra Blume. found at the pole, sapling, and seedling levels. The H' values for the stages of tree growth, polishing, sapling, and seedling were 1.71, 1.63, 1.47, and 1.39, respectively, included in the moderate diversity category. Globally, there are 2 species categorized as vulnerable (VU) and 1 species near threatened (NT) based on IUCN data.