scholarly journals Spatial Spread of Invasive Foreign Plants Clidemia hirta (L.) D. Don in Bung Hatta Forest Park, Padang, West Sumatra

2019 ◽  
Vol 7 (2) ◽  
pp. 136
Author(s):  
Rian Anggraini ◽  
Solfiyeni Solfiyeni
Keyword(s):  
Spatial Distribution ◽  
Light Intensity ◽  
Distribution Pattern ◽  
Spatial Spread ◽  
Forest Park ◽  
The Road ◽  
West Sumatra ◽  
Belt Transect ◽  
Morisita Index ◽  
Number Of Individuals

Research on Spatial Spread of Invasive Foreign Plants Clidemia hirta in Bung Hatta Forest Park, Padang, West Sumatra, has been carried out from January to June 2018. The purpose of this study was to determine the spatial distribution pattern of invasive foreign plants Clidemia hirta and analyze the influence of distance from roads and influence light intensity on the distribution of the number of individuals Clidemia hirta in the Bung Hatta Forest Park. This study uses a belt transect method with a width of 2 meters along 250 meters. Along the transect, a plot of 2x2 meters was made with 125 plots. Observations made on Clidemia hirta is to calculate the number of individuals and measure the intensity of light in each plot. The results showed that the pattern of spread of  Clidemia hirta was grouped with the Morisita Index of 2.1. The distance from the road and the intensity of light does not affect the distribution of the number of individuals with R Square values of 0.022 and 0.007, respectively.

Ecological and environmental indicators of Brazil Nut Tree (Bertholletia excelsa Bonpl.) in Flona do Jamari, Rondônia

2020 ◽  
Vol 11 (7) ◽  
pp. 740-751
Author(s):  
Nilson Reinaldo Fernandes dos Santos Júnior ◽  
Diogo Martins Rosa ◽  
José Das Dores de Sá Rocha ◽  
Marta Silvana Volpato Sccoti ◽  
Scheila Cristina Biazatti ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Geographic Location ◽  
Distribution Patterns ◽  
Environmental Indicators ◽  
Diameter Distribution ◽  
Brazil Nut ◽  
Productive Potential ◽  
Morisita Index ◽  
Individual Trees

Mapping Brazil nut trees in the Amazon is essential for indicating its distribution patterns within different ecosystems, while also being useful to estimate the species productive potential. This study aimed to evaluate the spatial distribution of Brazil nut trees in Flona do Jamari – RO, considering its environmental and topographic conditions. A census was performed for all individual trees sized ≥ 35 cm in diameter at 1.30 m breast height (DBH) above the ground of six Annual Production Units (APU) in Forest Management Unit III (FMU-III), a 11,011.2 ha area of Flona do Jamari, RO. DBH and geographic location (GPS) were collected for each tree. Structure and diameter distribution were evaluated by abundance, density, dominance, and frequency. The Morisita index was used to identify the spatial distribution pattern. The environment was defined by the local relative height found along the drainage network, by the digital model Height Above the Nearest Drainage (HAND). Most trees were among DBH intermediate classes (60 to 140 cm), and only a few were young trees (DBH < 50 cm). Brazil nut trees present a random spatial distribution and a predominant distribution pattern of 'terra-firme (solid ground)'. Such information on the species structural, spatial, and ecological patterns serve as key elements for further studies on production potential.

scholarly journals Spatial Distribution Pattern of Trees in Relation to Soil Edaphic Status in Tropical Rain Forest in West Sumatra, Indonesia II. Distribution of Non-Accumulating Trees.

Tropics ◽  
1998 ◽  
Vol 8 (1/2) ◽  
pp. 17-30 ◽  
Author(s):  
Tsugiyuki MASUNAGA ◽  
Daisuke KUBOTA ◽  
Usher WILLIAM ◽  
Mitsuru HOTTA ◽  
Yoshiaki SHINMURA ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Spatial Distribution Pattern ◽  
West Sumatra

scholarly journals Distribution Pattern and Mapping of Invasive Alien Species Bellucia pentamera in Conservation Area of PT. Tidar Kerinci Agung (TKA) Solok Selatan

2021 ◽  
Vol 9 (1) ◽  
pp. 30
Author(s):  
Uswatul Inayah ◽  
Solfiyeni Solfiyeni
Keyword(s):  
Linear Regression ◽  
Light Intensity ◽  
Distribution Pattern ◽  
Alien Species ◽  
Invasive Alien Species ◽  
P Value ◽  
Conservation Area ◽  
Belt Transect

Bellucia pentamera is one of the most dangerous invasive alien species for environment. This species had been invaded many forests in Indonesia. This species would invade more area due to deforestation. The objectives of this study were to know the mapping and distribution pattern of B. pentamera; to know the effects of distance from road and light intensity to distribution of B. pentamera. This study was conducted from March to August 2020 in Conservation Area of PT. TKA Solok Selatan using belt transect method by plotting 20x50 m2. Data was analyzed using Morishita Index and Linear Regression. Distribution pattern of B. pentamera in PT. TKA was clumped, showed by 1.17 of Morishita index. Seedlings and saplings of B. pentamera were dominant at the edge of conservation forest while trees were distributed from the middle to inside of the forest. Distance from road gave positively effects and significantly towards distribution of B. pentamera showing result 0.702 of R2 and 0.007 of p-Value. Light intensity did not give effects significantly towards distribution of B. pentamera showing result 0.0806 of R2 and 0.427 of p-Value.

scholarly journals ESTRUTURA POPULACIONAL DE Manilkara huberi (Ducke) A. Chev. E Dinizia excelsa DUCKE EM FLORESTA DE TERRA FIRME NO AMAPÁ

Nativa ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 445
Author(s):  
Samuel Nahon da Costa ◽  
Fernando Galvão Rabelo ◽  
Robson Borges de Lima ◽  
Diego Armando Silva da Silva ◽  
Cleyton Wilson Pereira de Lima ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
The Other ◽  
Diameter Distribution ◽  
Terra Firme ◽  
Diameter Class ◽  
Upland Forest ◽  
Morisita Index ◽  
Number Of Individuals ◽  
Diameter Classes ◽  
Dinizia Excelsa

O objetivo desse trabalho foi analisar a estrutura diamétrica e espacial das espécies Manilkara huberi (Ducke) A. Chev. e Dinizia excelsa Ducke. A distribuição diamétrica foi determinada conforme a metodologia de Sturges. O modelo de Meyer foi ajustado para estimar o número de indivíduos por classe de diâmetro. O padrão de distribuição espacial foi estimado por meio do índice de Morisita. Foram encontrados 1.372 indivíduos de M. huberi, onde os dados de sua estrutura diamétrica foram divididas em 11 classes com intervalo de 6,58 cm. Em relação à espécie D. excelsa, foram encontrados 100 indivíduos e seus dados geraram 7 classes diamétricas com 12 cm de intervalo. A distribuição diamétrica dos indivíduos de M. huberi seguiu a distribuição em “J-invertido”, que é típica das florestas naturais inequiâneas, com um quociente “q” estimado de 1,39. Já os indivíduos da espécie D. excelsa apresentaram-se desbalanceados em todos os centros de classes, não seguindo a tendência de “J-invertido”, e um quociente “q” estimado de 1,22. Quanto à distribuição espacial, observou-se por meio do índice de Morisita que ambas as espécies seguem uma distribuição agrupada em que os indivíduos localizam-se próxima à planta mãe, portanto, as populações tendem a ser agrupadas. As espécies possuem distribuição espacial agregado, subsidiando a exploração das árvores com aptidão ao manejo, observando possíveis ressalvas para a espécie M. huberi.Palavras-chave: quociente De Liocourt; índice de Morisita; floresta ombrófila. POPULATION STRUCTURE OF Manilkara huberi (Ducke) A. Chev. AND Dinizia excelsa Ducke IN AN UPLAND FOREST IN AMAPA ABSTRACT: The aim of this work was to analyze the diametric and spatial structure of the Manilkara huberi (Ducke) A. Chev. and Dinizia excelsa Ducke species. The diameters distribution was determined according to the Sturges methodology. The Meyer model was adjusted to estimate the number of individuals per diameter class. The spatial distribution pattern was estimated using the Morisita index. We found 1,372 individuals of M. huberi, where the data of their diametric structure were divided into 11 classes with an interval of 6.58 cm. In relation to specie D. excelsa, we found 100 individuals and their data generated 7 diameter classes with 12 cm interval. The diameter distribution of M. huberi individuals followed the J-inverted distribution, which is typical of uneven-aged natural forest, with an estimated "q" quotient of 1.39. On the other hand, the individuals of the D. excelsa species showed unbalanced in all class centers, not following the J-inverted distribution and estimated “q” quotient of 1.22. As for the spatial distribution, it was observed through the Morisita index that both species follow a grouped distribution in which the individuals are located close to the mother plant, therefore, the populations tend to be grouped. The species have an aggregate spatial distribution, subsidizing the exploitation of trees with aptitude for management, observing possible caveats for M. huberi specie.Keywords: De Liocourt quotient; Morisita index; ombrophylous forest.

Study on Pseudolarix amabilis Population Spatial Distribution Pattern

2012 ◽  
Vol 485 ◽  
pp. 221-224 ◽  
Author(s):  
Ren Yan Duan ◽  
Min Yi Huang ◽  
Fei Lin ◽  
Yue Zhang
Keyword(s):  
Spatial Distribution ◽  
Diffusion Process ◽  
Distribution Pattern ◽  
Spatial Patterns ◽  
Field Data ◽  
Spatial Distribution Pattern ◽  
Morisita Index ◽  
Pattern Scale ◽  
Population Spatial Distribution ◽  
Peak Value

Field data were sampled by the method of contiguous grid quadrate. The spatial patterns of Pseudolarix amabilis populations were studied by the following methods: DispItalic textersal index (C), David moores index (I), Lloyd index (m*/m), Morisita index (Iδ), Parameter of negative index (K) and Cassie index (1/K). The quadrate variance analysis, Greig-Smith and Kershaw methods were used to study the spatial distribution pattern, pattern scale and pattern intensity of Pinus armandi population at different sizes. The result showed that P. amabilis population is most clumped. The result indicated the pattern intensity was decreasing with the size increasing and a single peak value appeared in the curve with the area increasing. There was a slow change in the pattern intensity of population, which means a smaller variation in environment and a bigger difference in the relative density of population patches during diffusion process.

scholarly journals INFLUÊNCIA DO TAMANHO DE PARCELA NO CÁLCULO DA DISTRIBUIÇÃO ESPACIAL DE Anadenanthera peregrina (L.) Speng. E Apuleia leiocarpa J. F. Macbr EM UMA FLORESTA ESTACIONAL SEMIDECIDUAL

Nativa ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 183
Author(s):  
Aguida Beatriz Travaglia Viana ◽  
Carlos Moreira Miquelino Eleto Torres ◽  
Liniker Fernandes da Silva ◽  
Samuel José Silva Soares da Rocha
Keyword(s):  
Spatial Distribution ◽  
Spatial Analysis ◽  
Distribution Pattern ◽  
Unit Size ◽  
Plot Size ◽  
Distribution Calculation ◽  
Plot Area ◽  
Real Value ◽  
Semideciduous Seasonal Forest ◽  
Morisita Index

Objetivou-se com este estudo avaliar o comportamento dos índices de distribuição espacial das espécies Anadenanthera peregrina e Apuleia leiocarpa, em diferentes tamanhos de parcelas. Realizou-se um censo na Mata da Silvicultura, localizada em Viçosa, M.G. por meio do qual todos indivíduos das duas espécies, com DAP ≥ 20 cm, foram medidos e georreferenciados. Os dados foram agrupados em unidades amostrais de (10x10) m², (10x30) m², (10x50) m², (20x10) m², (20x30) m² e (20x50) m². O padrão de distribuição espacial das espécies foi identificado por meio dos índices de Payandeh (Pi), MacGuinnes (IGAi), Fracker e Brischle (Ki) e Morisita (IMi). Posteriormente, para cada tamanho de unidade amostral, selecionou-se aleatoriamente 10% do número total de parcelas e os índices foram calculados. Foram realizadas 10 repetições desse procedimento e a análise da distribuição espacial foi feita com base na média dos valores encontrados. O IGAi, Pi, e Ki foram diretamente proporcionais a área das parcelas e o IMi, inversamente proporcional. O IGAi apresentou as menores diferenças entre as médias das amostragens e os valores reais aferidos pelo censo. Diante disso, o IGAi foi o índice mais adequado para se estudar a distribuição espacial das espécies.Palavra-chave: análise espacial de árvores, índice de Morisita, agregação. PLOT SIZE INFLUENCE IN THE SPATIAL DISTRIBUTION CALCULATION OF Anadenanthera peregrina (L.) Speng. AND Apuleia leiocarpa J. F. Macbr IN SEMIDECIDUOUS  SEASONAL FOREST ABSTRACT:The objective of this study was to evaluate the behavior of spatial distribution indexes of the species Anadenanthera peregrina and Apuleia leiocarpa, in different plot sizes. A forest census was carried out in the Mata da Silvicultura, located in Viçosa, M.G. through which all individuals of both species, with DBH ≥ 20 cm, were measured and georeferenced. The data were grouped into sampling units of (10x10) m², (10x30) m², (20x10) m², (20x10) m² and (20x50) m². The spatial distribution pattern of the species was identified through the Payandeh (Pi), MacGuinnes (IGAi), Fracker and Brischle (Ki) and Morisita (IMi) indexes. Subsequently, for each sampling unit size, 10% of the total number of plots were randomly selected and the indexes were calculated. Ten replicates of this procedure were perfomed and the spatial analysis was done based on the average of the values found. The IGAi, Pi, and Ki were directly proportional to the plot area and the IMi, inversely proportional. The IGAi presented the smallest differences between the sampling means and the real value measured by the census. Noted that, it was clear that the IGAi was the most adequate index to study a spatial distribution of the species.Keywords: tree spatial analysis, Morisita Index, aggregation. DOI:

scholarly journals Spatial Distribution Pattern of Trees in Relation to Soil Edaphic Status in Tropical Rain Forest in West Sumatra, Indonesia I. Distribution of Accumulating Trees.

Tropics ◽  
1998 ◽  
Vol 7 (3/4) ◽  
pp. 209-222 ◽  
Author(s):  
Tsugiyuki MASUNAGA ◽  
Daisuke KUBOTA ◽  
Usher WILLIAM ◽  
Mitsuru HOTTA ◽  
Yoshiaki SHINMURA ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Spatial Distribution Pattern ◽  
West Sumatra

scholarly journals The intertidal gastropods (Gastropoda: Mollusca) diversity and taxa distribution in Alas Purwo National Park, East Java, Indonesia

2019 ◽  
Vol 20 (7) ◽  
Author(s):  
SUSINTOWATI SUSINTOWATI ◽  
NYOMAN PUNIAWATI ◽  
ERNY POEDJIRAHAJOE ◽  
NIKEN SATUTI NUR HANDAYANI ◽  
SUWARNO HADISUSANTO
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
National Park ◽  
Diversity Index ◽  
Principal Component ◽  
Spatial Distribution Pattern ◽  
Intertidal Zones ◽  
Diverse Environment ◽  
Morisita Index ◽  
Diversity Profile

Abstract. Susintowati, Puniawati N, Poedjirahajoe, Handayani NSN, Hadisusanto S. 2019. The intertidal gastropods (Gastropoda: Mollusca) diversity and taxa distribution in Alas Purwo National Park, East Java, Indonesia. Biodiversitas 20: 2016-2027. Gastropods play an essential role in the ecosystem and can be used as bioindicators of environmental pollution. Understanding of their behavior, habitat, and distribution, and how these factors evolve, is crucial. This paper aimed to describe the diversity of the gastropod community and their spatial taxa distribution, based on the specimen frequency across all observed samples, in the diverse environment of Alas Purwo National Park (APNP), East Java, Indonesia. We studied eight beaches and two mangroves areas, and the study areas of the intertidal zone divided into upper, middle, and lower zones towards the sea. The purposive sampling was used to determine the locations and multi-plot quadrats for observations. The diversity of gastropods was elucidated by using the Shannon and Simpson indexes, while the Morisita index was applied for analyzing their spatial distribution pattern. However, the correspondence analysis and principal component analysis were performed using the software of PAST 3.22 for describing the diversity profile and individual rarefaction of gastropods together with environmental quality. There were three beach types: rocky, sandy, and muddy beaches were found in APNP. The highest diversity index (H’) was found on Pancur beach: H’ = 3.271, D = 0.947 of 67 species. The spatial distribution pattern of gastropods species was weakly clumped to random, with Ip: 0.165 - 0.016. Gastropods, both predators and scavengers, were distributed from the upper to lower zones. The distribution of gastropods in APNP is mostly in type B. These results expand our knowledge of gastropods diversity and distribution of Indonesia’s beach and can contribute to the future environmental assessments of biodiversity of tropical intertidal zones worldwide.

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