scholarly journals Woody Species Diversity and Structure of Protected Woodlands Adjacent to Free Grazing Land Woodland at Dugda Woreda, Oromia, Ethiopia

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Tsegu Ereso Denbel
Keyword(s):  
Basal Area ◽  
Floristic Composition ◽  
Woody Species ◽  
Systematic Sampling ◽  
Importance Value Index ◽  
Importance Value ◽  
Mature Trees ◽  
Grazing Land ◽  
Individual Tree ◽  
Breast Height

The study was conducted in protected woodland and free graze woodland located in Dugda Woreda, Oromia state, Ethiopia. The objective of the study was to explore the floristic composition, structure, and regeneration of woody species. In the park, the vegetation ecology has not been studied up to date, which is necessary for conservation. The systematic sampling technique was used to collect vegetation and human disturbance (presence and absence) data from August to December 2017. The vegetation data were collected from 30 plots from each woodland with a size of 900 m2 (30 m × 300 m) for tree/shrub, while subplots of size 400 m2 (20 m × 20 m) for sapling, respectively, were established in the main plots. Individual tree and shrub diameters at breast height (DBH) ≥2.5 cm and height ≥ 2 m were measured using a tape meter and clinometer, respectively. Diameter at breast height (DBH), frequency, density, basal area, and importance value index (IVI) were used for vegetation structure description, while the densities of mature trees, sapling, and seedling were used for regeneration. A total of 446 individual stems from free grazed woodland and 641 individual stems from protected woodland with a DBH of ≥2.5 cm were encountered from 30 studied sample plots that are protected and free grazed woodlands. Of these, from the total woody species, 68.42% were trees and 31.57% shrubs found in protected woodland; 76.92% were trees and 23.07% shrubs found in free grazed woodland. The total basal area of the woody plant was 3.1 ± 1 m2/ha in free grazed woodland and 4.2 ± 2 m2/ha in protected woodland, calculated for 19 woody species. Fabaceae, Balanitaceae, Capparidaceae, Verbenaceae, and Boraginaceae families were the most abundant families in both woodlands. However, there is a good initiation for the conservation of the park; still, the vegetation of the park was threatened by human-induced fire following intensive farming, gold mining, and overgrazing.

scholarly journals Woody Species Structure and Regeneration Status in Kafta Sheraro National Park Dry Forest, Tigray Region, Ethiopia

2020 ◽  
Vol 2020 ◽  
pp. 1-22
Author(s):  
Fitsum Temesgen ◽  
Bikila Warkineh
Keyword(s):  
National Park ◽  
Gold Mining ◽  
Basal Area ◽  
Woody Species ◽  
Dry Forest ◽  
Importance Value ◽  
Mature Trees ◽  
Individual Tree ◽  
Diameter At Breast Height ◽  
Breast Height

The study was conducted in Kafta Sheraro National Park (KSNP) dry woodland natural forest located in Kafta Humera and Tahitay Adiyabo weredas (districts), Western and Northwestern Zones of Tigray regional governmental state, North Ethiopia. The objective of the study was to explore the floristic composition, structure, and regeneration of woody species in the home of Loxodonta africana L., Hippotragus equinus, Anthropoides virgo, Ourebia ourebi, Crocuta crocuta, Tragelaphus strepsiceros, Phacochoerus africanus, and unidentified crocodile and fish species. In the park, the vegetation ecology has not been studied up to date which is necessary for conservation. The systematic sampling technique was used to collect vegetation and human disturbance (presence and absence) data from August to December 2018. The vegetation data were collected from 161 plots each with a size of 400 m2 (20 m × 20 m) for tree/shrub while subplots of size 100 m2 (10 m × 10 m) and 25 m2 (5 m × 5 m) for sapling and seedling, respectively, were established in the main plots. Individual tree and shrub diameter at breast height (DBH) ≥2.5 cm and height ≥ 2 m were measured using tape meter and clinometer, respectively. Diameter at breast height (DBH), frequency, density, basal area, and importance value index (IVI) were used for vegetation structure description while the density of mature trees, sapling, and seedling was used for regeneration. A total of 70 woody species (46 (65.7%) trees, 18 (25.7%) shrubs, and 6 (8.6%) tree/shrub) were identified. The total basal area and density of 79.3 ± 4.6 m2·ha−1 and 466 ± 12.8 stems·ha−1, respectively, were calculated for 64 woody species. Fabaceae was the most dominant family with 16 species (22.9%) followed by Combretaceae with 8 species (11.4%). The most dominant and frequent species throughout the park were Acacia mellifera, Combretum hartmannianum, Terminalia brownii, Balanites aegyptiaca, Dichrostachys cinerea, Acacia senegal, Acacia oerfota, Boswellia papyrifera, Ziziphus spina-christi, and Anogeissus leiocarpus. Abnormal patterns of selected woody species were dominantly identified. The regenerating status of all the woody plant species was categorized as “fair” (18.75%), “poor” (7.81%), and “none” (73.44%). There was a significant correlation between altitude, anthropogenic disturbance (grazing and fire frequency), and density of seedling, sapling, and mature trees. But there was no correlation between gold mining and regeneration population. However, there is a good initiation for the conservation of the park; still, the vegetation of the park was threatened by human-induced fire following intensive farming, gold mining, and overgrazing. Therefore, the study area was the habitat for the population of the African elephant; species with low importance value indices and lack or having few seedling and sapling stage should be prioritized for conservation, and their soil seed banks should be studied further.

Structure and floristic composition of a tropical evergreen forest in south-west India

1996 ◽  
Vol 12 (2) ◽  
pp. 191-214 ◽  
Author(s):  
Jean-Pierre Pascal ◽  
Raphael Pelissier
Keyword(s):  
Western Ghats ◽  
Basal Area ◽  
Floristic Composition ◽  
Evergreen Forest ◽  
Systematic Sampling ◽  
Importance Value Index ◽  
Importance Value ◽  
Tropical Evergreen Forest ◽  
Western Ghats Of India ◽  
The Western Ghats

ABSTRACTA permanent plot of 28 ha was established in a dense wet evergreen forest in the Western Ghats of India to study the functioning of the ecosystem. Since April 1990, 1981 trees of ≥30 cm gbh have been enumerated in a systematic sampling of five strips totalling 3.12 ha. This paper describes the main structural and floristic characteristics of the plot.The density (635 trees ≥30 cm gbh per hectare) and basal area (39.7 m2 ha−1) are high. Despite the high diversity (Simpson's D = 0.92 and Shannon's H' = 4.56), four species are distinctly, dominant in terms of an importance value index (relative density + relative basal area). Each of these four species occupies a different layer in the ecosystem: Humboldtia brunonis Wall. (Fabaceae) dominates the undergrowth, Myristica dactyloïdes Gaertn. (Myristicaceae) the intermediate strata, Valeria indica L. (Dipterocarpaceae) the higher canopy level and Dipterocarpus indicus Bedd. (Dipterocarpaceae) the emergents. This pronounced species hierarchy is one of the most important characteristics of the evergreen forests of the Western Ghats. The two dipterocarps account for 20.1% of the total number of trees and contribute 40.9% to the total basal area. This formation can, therefore, be considered as the westernmost lowland dipterocarp forest of Asia.Analysis of the spatial variations in the floristic composition and in the structure of the main species populations shows that two kinds of mature phases can be identified: where the topography is raised and gently sloping, the vertical structure of the stand is discontinuous, with Dipterocarpus indicus and Vateria indica forming an emergent layer above a dense undergrowth; on slopes, the stand is lower, vertically continuous and saturated with Valeria indica and Myristica dactyloïdes. The link between the structure of the stand and dynamic processes is discussed.

scholarly journals DYNAMICS OF WOODY SPECIES IN DRY TROPICAL FOREST (CAATINGA), BRAZIL

FLORESTA ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 154
Author(s):  
Thyêgo Nunes Alves Barreto ◽  
Rinaldo Luiz Caraciolo Ferreira ◽  
José Antônio Aleixo Silva ◽  
Cleuma Christir da silva Almeida ◽  
Andréa de Vasconcelos Freitas Pinto
Keyword(s):  
Tropical Forest ◽  
Basal Area ◽  
Floristic Composition ◽  
Woody Species ◽  
Shannon Index ◽  
Permanent Plots ◽  
Importance Value ◽  
Sustainability Strategies ◽  
History Of ◽  
History Of Use

Studying selected floristic changes in dry forests is fundamental to foster conservation and sustainability strategies. Objective: to analyze the occurrence of woody species in a tropical forest with a history of use. In 2008, 40 permanent plots were installed and wood with a circumference of 1.30 m at a breast height (CAP) ≥ 6 cm were measured. In 2012, newly established individuals (those that did not meet the size requirements in 2008 but did in 2012) and mortality of the remaining individuals were analyzed by computer. Where applicable, the density, frequency, and absolute dominance, importance value, newly established individuals, mortality, and gross growth for each species, along with the Shannon index were estimated. The floristic composition and diversity remain unchanged. After four years, there were few differences between species, while in most cases the growth in the basal area was positive and sometimes the number of newly established individuals exceeded the mortality. After 24 years of logging, the analyzed forest area did not reach its initial basal area stock when compared to other areas of the Caatinga that do not have a history of disturbance.

scholarly journals Predicting population status of gum and resin bearing plant species from size distributions in Benishangul Gumuz Regional State, Ethiopia: Inferences for their sustainable management

2021 ◽  
Vol 1 (1) ◽  
pp. 022-031
Author(s):  
Dereje Mosissa ◽  
Girum Faris ◽  
Sisay Aman
Keyword(s):  
Basal Area ◽  
Woody Species ◽  
Small Scale ◽  
Older Individuals ◽  
Importance Value Index ◽  
Importance Value ◽  
Continuous Growth ◽  
Regeneration Status ◽  
Regional State ◽  
Good Reproduction

Diversity, population structures and regeneration status of gum- and resin- producing woody species, were assessed in 116 sample plots, each measuring 400 m2 and established along line transects. The data were collected in two selected districts, namely, Sherkole and Kurmuk in Benishangul-Gumuz National Regional State, one of the gum and resin belts in western Ethiopia. The gum- and resin-producing woody species had 1.04 and 0.7 diversity and 0.576 and 0.49 evenness values at Kurmuk and Sherkole districts, respectively. They accounted for 26% and 46% of the density, 51% and 58% of the basal area and 32% and 53% of the Importance Value Index of all the woody species, respectively. The gum- and resin- bearing woody species exhibited three patterns of population structure. The first pattern suggests good reproduction abilities of the species coupled with good recruitment of seedlings and their subsequent continuous growth to replace older individuals over time, indicating stable regeneration. About 61% of the gum- and resin- bearing woody species fall under this category. The other two patterns indicate hampered regeneration status of the woody species. Heavy grazing, conversion to crop land by small scale farming, gold mining, recurrent fire and climate change were mentioned as major bottlenecks of natural regeneration and recruitment. Policy, extension and research recommendations are discussed.

scholarly journals Tree stand floristic dynamics in secondary forests of different ages in Sarawak, Malaysia

2018 ◽  
Vol 19 (3) ◽  
pp. 717-723 ◽  
Author(s):  
KARYATI KARYATI ◽  
ISA B. IPOR ◽  
ISMAIL JUSOH ◽  
MOHD. EFFENDI WASLI
Keyword(s):  
Stand Structure ◽  
Secondary Forest ◽  
Basal Area ◽  
Floristic Composition ◽  
Common Species ◽  
Secondary Forests ◽  
Tree Stand ◽  
Importance Value Index ◽  
Importance Value ◽  
Different Ages

Karyati, Ipor IB, Jusoh I, Wasli ME. 2018. Tree stand floristic dynamics in secondary forests of different ages in Sarawak, Malaysia. Biodiversitas 19: 717-723. Succession is a series sequential processes of the development of floristic community which involves changes in community structure, species composition and diversity over time. The information on tree stand floristic dynamics of various stages of succession in secondary forests in Malaysia is currently lacking. This study was conducted to determine tree stand structure, floristic composition, and species diversity in various stages of secondary forest development in the study areas. A total of 997, 1,842, and 834 tree stems with diameter at breast height (DBH) of > 5 cm were recorded in one-hectare-plots of 5, 10, and 20 year old secondary forests, respectively. The ten most common species in 5 and 10 year old of secondary forests consisted mostly of light demanding species. In the 20 year old secondary forest, these species did not exist. Macaranga gigantea was the most dominant tree species in the 5 and 10 year old secondary forests in terms of basal area and volume per hectare. The most common species, based on density, basal area, volume, and Importance Value Index (IVi), in the 20 year old secondary forest was Adinandra dumosa. The diversity and richness indices of the 10 year old secondary forest were the highest among all study sites.

scholarly journals Composição florística e estrutural de um componente arbóreo em área de cerrado, Paranã-TO

2015 ◽  
Vol 10 (5) ◽  
pp. 108
Author(s):  
A. B. M. L. Rêgo ◽  
P. B. Souza ◽  
R. R. Silva ◽  
P. L. Rêgo
Keyword(s):  
Diversity Index ◽  
Basal Area ◽  
Floristic Composition ◽  
Sensu Stricto ◽  
Importance Value Index ◽  
Importance Value ◽  
Closed Area ◽  
Absolute Density ◽  
Density Values ◽  
Individual Trees

<p>O Cerrado Brasileiro apresenta uma enorme diversidade de fitofisionomias divididas em formações florestais, savânicas e campestres. Com o objetivo de estudar a composição florística e estrutural de um fragmento de cerrado <em>sensu stricto</em>, a fim de fornecer subsídios para conservação e manejo adequado de áreas similares. Foram instaladas sistematicamente quatro parcelas de 25x100m, sendo que as mesmas foram distanciadas 25 m entre si, perfazendo um total de 1,0 hectare de área amostral. No interior das parcelas, foram amostrados todos os indivíduos arbustivo-arbóreos, com circunferência a 1,30m do solo (CAP) maior ou igual a 15 cm. Para obtenção dos parâmetros fitossociológicos densidade relativa (DR), densidade absoluta (DA), dominância absoluta (DoA), dominância relativa (DoR), frequência absoluta (FA), frequência relativa (FR), índice de valor de importância (IVI), índice de valor de cobertura (IVC), índice de diversidade de Shannon (H’) e Pielou (J). Foram amostrados 245 indivíduos, distribuídos em 29 espécies, 29 gêneros pertencentes a 20 famílias, o que corresponde a uma área basal total de 1,94 m².ha<sup>-1</sup> e densidade absoluta estimada de 327 ind.ha<sup>-1</sup>. As espécies que apresentaram maiores valores de (IVI) foram <em>Qualea parviflora</em> (38,45%), <em>Curatella americana</em> (34,53%), <em>Byrsonima verbascifolia</em> (32,20%), <em>Psidium incanescens</em> (31,89%), <em>Pterodon emarginatus </em>(18,62%) e <em>Anachardium humile</em> (18,34%). <em>Qualea parviflora</em> foi a espécie mais representativa dentro do componente arbóreo o que se conclui aos altos valores de densidade e dominância nos estratos.</p><p align="center"><strong><em>Floristic composition and structural components of a tree in closed area in the municipality of Parana-Tocantins </em></strong></p><p><strong>Abstract</strong><strong>: </strong>The Brazilian Cerrado presents a huge diversity of vegetation types divided into forests, savannas and country. In order to study the floristic and structural composition of a cerrado fragment in order to provide subsidies for conservation and proper management of similar areas. Systematically they were installed four installments of 25x100 m, being that they were spaced 25 m apart, totaling 1.0 hectare sample area. Inside the plots were sampled every shrub and individual trees with circumference at 1.30 m soil (CAP) greater than or equal to 15 cm. To obtain the Phytosociological relative density parameters (DR), absolute density (DA), absolute dominance (DoA), relative dominance (DoR), absolute frequency (AF), relative frequency (RF), importance value index (IVI) Coverage value index (CVI), Shannon diversity index (H ') and Pielou (J). We sampled 245 individuals belonging to 29 species, 29 genera belonging to 20 families, which corresponds to a basal area of 1.94 m².ha<sup>-1</sup> and estimated absolute density of 327 ind.ha<sup>-1</sup>. The species showing higher values of (IVI) were <em>Qualea parviflora</em> (38.45%), <em>American Curatella</em> (34.53%), <em>Byrsonima verbascifolia</em> (32.20%), <em>Psidium incanescens</em> (31.89%), <em>Pterodon emarginatus</em> (18.62%) and <em>Anachardium humile</em> (18.34%). <em>Qualea parviflora</em> was the most representative species within the arboreal component which is concluded to high density values and dominance in the strata.</p>

scholarly journals Vegetative structure, floristic composition and natural regeneration of a species in Ylat Forest, Meket Woreda, Northeastern Ethiopia

2017 ◽  
Vol 1 (1) ◽  
pp. 40-53
Author(s):  
SISAY TEGEGNE ◽  
BIKILA WORKINEH
Keyword(s):  
Plant Species ◽  
Natural Regeneration ◽  
Woody Plant ◽  
Vascular Plant ◽  
Floristic Composition ◽  
Woody Species ◽  
Systematic Sampling ◽  
Importance Value Index ◽  
Woody Plant Species ◽  
Vegetative Structure

Tegegne S, Workineh B. 2017. Vegetative structure, floristic composition and natural regeneration of a species in Ylat Forest in Meket Woreda, Northeastern Ethiopia. Asian J For 1: 40-53. The natural forest of Ylat in Meket Woreda, Northeastern Ethiopia was examined to decide the vegetative structure, floristic formation and natural regeneration of woodland species and to supply data on sustainable administration of the woody plants in specific and the woodland founts in common. Systematic sampling design was used in this study to gather vegetation information. For each of the sampling sites, five transect lines having fiftyfour primary plots with 400 m2 (20m × 20m) each were laid out to gather the information on woody species along 200m line transects. A total of 60 vascular plant species having a place to 41 families and 56 genera were identified of which 13 (21.67%) were trees, 31 (51.67%) bushes, 6 (10%) climbers and 10 species (16.66) of herbs. Of all the families, Lamiaceae (8.33%) and Fabaceae, Rosaceae, Solanaceae and Euphorbiaceae 3 species (5%) were the most overwhelming woody plant species and followed by Sapindaceae, Aloaceae, Ranunclaceae, Poaceae, Oleaceae, Polygonaceae and Cucurbitaceae contains 2 species each (3.33%). A total of 2652 woody plant species individuals (1227.77 individual/ha) were found of which 405 individuals were Myrsine africana and 19 individuals were Millettia ferruginea and 20 individuals were Dombeya torrida. This data showed the highest and the lowest number of woody plant species. The thickness of woody species with DBH ≥ 2.5cm was 1227.77 individual/ha, basal zone was 1 m2 /ha, frequency of woody species was 258. The overall Shannon diversity and evenness of woody species was 2.94 and 0.84 respectively, demonstrating that the diversity and evenness of woody species within the timberland is moderately high. The woody plant species having the highest importance value index (IVI) were Erica arborea (36.31) followed by Allophylus abyssinicus (28.65) whereas Hagenia abyssinica, Myrica salicifolia, Euphorbia tirucalli, Calpurnia aurea were the lowest IVI and should be given conservation priority. Finally, this study showed that the population structure of the most woody plant species in Ylat Timberland was in a great state of regeneration recruitment level.

scholarly journals Predicting Population Status of Gum and Resin Bearing Plant Species from Size Distributions in Benishangul Gumuz Regional State, Ethiopia: Inferences for Their Sustainable Management

2021 ◽  
pp. 48-55
Author(s):  
Dereje Mosissa ◽  
Girum Faris ◽  
Sisay Aman
Keyword(s):  
Basal Area ◽  
Woody Species ◽  
Small Scale ◽  
Older Individuals ◽  
Importance Value Index ◽  
Importance Value ◽  
Continuous Growth ◽  
Regeneration Status ◽  
Regional State ◽  
Good Reproduction

Diversity, population structures, and regeneration status of gum- and resin-producing woody species, were assessed in 116 sample plots, each measuring 400 m2 and established along line transects. The data were collected in two selected districts, namely, Sherkole and Kurmuk in Benishangul-Gumuz National Regional State, one of the gums and resin belts in western Ethiopia. The gum- and resin-producing woody species had 1.04 and 0.7 diversity and 0.576 and 0.49 evenness values at Kurmuk and Sherkole districts, respectively. They accounted for 26% and 46% of the density, 51% and 58% of the basal area, and 32% and 53% of the Importance Value Index of all the woody species, respectively. The gum- and resin-bearing woody species exhibited three patterns of population structure. The first pattern suggests good reproduction abilities of the species coupled with a good recruitment of seedlings and their subsequent continuous growth to replace older individuals over time, indicating stable regeneration. About 61% of the gum- and resin-bearing woody species fall under this category. The other two patterns indicate the hampered regeneration status of the woody species. Heavy grazing, conversion to cropland by small-scale farming, gold mining, recurrent fire, and climate change were mentioned as major bottlenecks of natural regeneration and recruitment. Policy, extension, and research recommendations are discussed.

scholarly journals The Species Diversity and Structure of The Limited Production Forest in Arui Watershed of Manokwari District of West Papua, Indonesia

2019 ◽  
Vol 11 (2) ◽  
pp. 279-288
Author(s):  
Mahmud Mahmud ◽  
Ambar Kusumandari ◽  
Sudarmadji Sudarmadji ◽  
Nunuk Supriyatno
Keyword(s):  
Species Diversity ◽  
Wiener Index ◽  
Systematic Sampling ◽  
Forest Conversion ◽  
Vegetation Analysis ◽  
Importance Value Index ◽  
Importance Value ◽  
Forestry Sector ◽  
West Papua ◽  
Chisocheton Ceramicus

The detailed causal factors of flood have not been established, whether because of the damage of upper watershed, sedimentation resulting in shallow river, forest conversion, the decrease in abundance and structure or high rainfall. The study aimed at finding out the species diversity and structure of the limited production forest (LPF) from the seedling to the tree stage of Arui watershed in Manokwari district. The species diversity was determined based on Shannon-Wiener index, while vegetation structure was determined based on Importance Value Index. There were totally 92 plots of samples drawn using systematic sampling. The results of vegetation analysis showed that there were 174 species of 43 families with the species diversity of 1.5-1.8 that was categorized as moderate. The four dominant species that were always found in seedling, sapling, pole and tree stages included: Pometia pinnata, Teijsmanniodendron bogoriense, Chisocheton ceramicus, and Horsfieldia irya. The conversion of the LPF into non-forestry sector for the purpose of accelerating development must be reviewed by considering hydrology, land, biodiversity, and social and regional aspects in order to prevent and to reduce flood in the coming days.

scholarly journals Fitossociologia de manguezais em zonas urbanas: um estudo de caso em Aracaju, Sergipe

2020 ◽  
Vol 13 (5) ◽  
pp. 2103
Author(s):  
Jose Paulo Santana ◽  
Eduardo Vinícius Da Silva Oliveira ◽  
Túlio Vinícius Paes Dantas ◽  
Myrna Friederichs Landim ◽  
Patrício Adriano da Rocha
Keyword(s):  
Urban Areas ◽  
Rhizophora Mangle ◽  
Floristic Composition ◽  
Laguncularia Racemosa ◽  
Mangrove Forests ◽  
Importance Value Index ◽  
Importance Value ◽  
Conocarpus Erectus ◽  
Avicennia Schaueriana

O objetivo deste estudo foi comparar a composição florística e a estrutura fitossociológica dos bosques de manguezais de áreas urbanas em Aracaju, estado de Sergipe, com diferentes tempos de regeneração e intensidades de impacto antrópico. Para o levantamento fitossociológico, foi adotado o método de parcelas múltiplas, sendo seis ou sete parcelas distribuídas equitativamente em dois transectos paralelos em quatro bosques de manguezais nos bairros 13 de julho, Porto Dantas, São Conrado e Mosqueiro. Destes, somente o bosque do Mosqueiro não apresentava tensores antrópicos contínuos como descarga de esgotos domésticos, retirada de madeira ou contribuição alóctone de sedimento. Para caracterizar a estrutura dos manguezais foram calculados os parâmetros densidade, frequência, dominância e o índice de valor de importância de cada espécie. Procedeu-se com a comparação estatística entre os bosques avaliados pelo teste de Kruskal-Wallis quanto a densidade geral e por espécie, diâmetro e altura geral dos indivíduos. Foram identificadas quatro espécies: Laguncularia racemosa, Avicennia schaueriana, Rhizophora mangle e Conocarpus erectus, que apresentaram diferenças de abundância e dominância entre os bosques analisados. De maneira geral, L. racemosa foi à espécie mais abundante e dominante nos bosques mais impactados, porém no bosque do Mosqueiro, R. mangle foi a mais dominante. Não houve diferenças significativas na densidade, diâmetro e altura geral dos indivíduos, porém a densidade de A. schaueriana e R. mangle diferiu entre os bosques. Em relação à altura, os bosques da 13 de julho e São Conrado apresentaram os maiores valores, ainda que possuíssem o menor tempo de regeneração pós-distúrbios.Phytosociology of mangroves in urban areas: a case study in Aracaju city, Sergipe stateA B S T R A C TThe aim of this paper was to compare the floristic composition and the phytosociological structure of the mangrove forests in urban areas with different levels of regeneration and intensities of anthropic impact. The study was performed in the municipality of Aracaju, Sergipe state, Brazil Northeast. For the phytosociological survey, the multiple plots method was adopted; so six or seven plots were equally distributed in two parallel transects in four mangrove forests in the neighborhoods 13 de Julho, Porto Dantas, São Conrado and Mosqueiro. Of these, only the Mosqueiro mangrove did not have continuous anthropic tensors such as discharge of domestic sewage, removal of wood or allochthonous contribution of sediment. To characterize the structure of the mangroves, the parameters density, frequency, dominance and the importance value index for each species were calculated. Statistical comparison was made among the mangroves evaluated using the Kruskal-Wallis test between general density and by species, diameter and general height of individuals. Four species were identified: Laguncularia racemosa, Avicennia schaueriana, Rhizophora mangle and Conocarpus erectus, which showed differences in abundance and dominance between the mangroves evaluated. In general, L. racemosa was the most abundant and dominant species in the most impacted mangrove, but in the Mosqueiro mangrove, R. mangle was more dominant. There were no significant differences in the density, diameter and general height of the individuals; however the density of A. schaueriana and R. mangle differed between mangroves. In relation to height, the forests of 13 de Julho and São Conrado presented the highest values, even though they had the shortest time of regeneration after disturbances.Keywords: ecotone, mangrove, forest structure, coastal zone, Brazil northeast.

Sign in / Sign up

Export Citation Format

Share Document