scholarly journals Spatial distribution of ectomycorrhizas and arbuscular mycorrhizas in Korup National Park rain forest, Cameroon, in relation to edaphic parameters

1998 ◽  
Vol 139 (2) ◽  
pp. 311-320 ◽  
Author(s):  
B. MOYERSOEN ◽  
A. H. FITTER ◽  
I. J. ALEXANDER
Keyword(s):  
Spatial Distribution ◽  
Rain Forest ◽  
National Park ◽  
Arbuscular Mycorrhizas ◽  
Korup National Park ◽  
Edaphic Parameters

scholarly journals Phosphorus nutrition of ectomycorrhizal and arbuscular mycorrhizal tree seedlings from a lowland tropical rain forest in Korup National Park, Cameroon

1998 ◽  
Vol 14 (1) ◽  
pp. 47-61 ◽  
Author(s):  
BERNARD MOYERSOEN ◽  
IAN J. ALEXANDER ◽  
ALASTAIR H. FITTER
Keyword(s):  
National Park ◽  
Growth Promotion ◽  
Phosphorus Uptake ◽  
Arbuscular Mycorrhizal ◽  
Arbuscular Mycorrhizas ◽  
Phosphorus Availability ◽  
Tropical Rain Forests ◽  
High Phosphorus ◽  
Korup National Park ◽  
Mycorrhizal Colonisation

The relationship between mycorrhizal colonisation and phosphorus acquired by seedlings of the arbuscular mycorrhizal tree Oubanguia alata Bak f. (Scytopetalaceae) and the ectomycorrhizal tree Tetraberlinia moreliana Aubr. (Caesalpiniodeae) was evaluated at low and high inorganic phosphorus availability. AM colonisation was positively correlated with phosphorus uptake by O. alata at low, but not at high phosphorus availability. Seedlings growth was positively related to arbuscular mycorrhizal colonisation at both low and high phosphorus availability, suggesting that growth promotion by arbuscular mycorrhizas is not simply related to an increase of phosphorus uptake. In contrast, phosphorus uptake by T. moreliana was correlated with EM colonisation at both low and high phosphorus availability, but there was no relationship between growth and ectomycorrhizal colonisation. Promotion of phosphorus uptake by arbuscular mycorrhizas and ectomycorrhizas at low phosphorus availability is consistent with the co-occurrence of the two types of mycorrhiza in tropical rain forests where available soil phosphorus is low. However, ectomycorrhizal colonisation may also be of advantage where inputs of phosphorus rich litter raise the phosphorus status of the soil, as seen in the groves of ectomycorrhizal trees in Korup National Park, and may be one of the factors reinforcing local dominance by these trees.

scholarly journals Ectomycorrhizal rain-forest legumes and soil phosphorus in Korup National Park, Cameroon

1988 ◽  
Vol 109 (4) ◽  
pp. 433-450 ◽  
Author(s):  
D. M. NEWBERY ◽  
I. J. ALEXANDER ◽  
D. W. THOMAS ◽  
J. S. GARTLAN
Keyword(s):  
Rain Forest ◽  
National Park ◽  
Soil Phosphorus ◽  
Korup National Park

scholarly journals The structure of Leguminosae-Detarioideae dominant rain forest in Korup National Park, Cameroon

2021 ◽  
Vol 154 (3) ◽  
pp. 376-390
Author(s):  
Xander M. Van der Burgt ◽  
David M. Newbery ◽  
Sylvanos Njibili
Keyword(s):  
Tree Species ◽  
Rain Forest ◽  
National Park ◽  
Size Structure ◽  
Single Species ◽  
Permanent Plots ◽  
Tree Species Composition ◽  
Lowland Rain Forest ◽  
Korup National Park ◽  
Southwest Region

Background and aims – We studied a cluster of trees in the Leguminosae subfamily Detarioideae, to: (1) determine the size, structure, and tree species composition of this cluster; (2) map the size, shape, and structure of groups of individual Detarioideae tree species in the cluster.Location – Lowland rain forest in southern Korup National Park, in the Southwest Region of Cameroon.Material and methods – Trees in permanent plots were recorded using standard plot enumeration techniques. Outside plots, single-species tree groups were recorded by a rapid technique. From this data, detailed maps of groups of trees were prepared.Key results – Detarioideae tree species occur co-dominant in a cluster of at least 32 km2 with an irregular shape. The cluster contained at least 42 Detarioideae tree species; at least 29 of these occurred in groups ranging in size from 50 to 4000 m across, depending on the species. Groups usually had circular shapes, caused by ballistic seed dispersal. In a group, trees were always mixed with trees of several other Detarioideae species. Every area within the cluster contained a specific set of Detarioideae species. The percentage of Detarioideae trees ≥ 60 cm stem diameter on 50 ha was up to 76% in Detarioideae-rich forest, to 6% in Detarioideae-poor forest. Of all trees in the centre of the cluster, 2.8% belonged to pioneer forest species, which indicates that disturbance levels were low during the past generations of trees.Discussion – The forests in the Detarioideae cluster have not been subject to substantial human and natural impacts in historic or prehistoric times. Such forests are exceptional in Africa. Detarioideae clusters may indicate glacial age forest refuges, especially clusters that contain both many different Detarioideae species and some Detarioideae species endemic to the cluster.

scholarly journals POPULATION STRUCTURE OF Araucaria angustifolia IN THE IGUAÇU NATIONAL PARK

FLORESTA ◽  
2015 ◽  
Vol 45 (2) ◽  
pp. 361 ◽  
Author(s):  
Alci Albiero Junior ◽  
Lívia Godinho Temponi ◽  
Franklin Galvão ◽  
Paulo Cesar Botosso ◽  
Ana Tereza Bittencourt Guimarães
Keyword(s):  
Population Structure ◽  
Spatial Distribution ◽  
Rain Forest ◽  
National Park ◽  
Forest Edge ◽  
Araucaria Angustifolia ◽  
Aggregate Distribution ◽  
Temperate Rain Forest ◽  
Males And Females ◽  
Number Of Individuals

AbstractThe aim of this study was to analyze the population structure, regeneration and spatial distribution of Araucaria angustifolia (Bertol.) Kuntz. within a natural forest and in forest edge with agricultural monoculture. All araucaria individuals from 10 cm high were recorded in 200 plots of 10 x 10 m. 479 individuals were sampled (416 at the edge and 63 inside). Of these, 33 were females, 37 males, 49 juveniles and 360 regenerating individuals. The population structure performance was similar to standard inverted-J. Regenerating individuals had mainly the aggregate distribution pattern, while juveniles, males and females had a uniform pattern. Density of the canopy affected frequency of the individuals, where higher frequencies at higher densities were observed, indicating that regeneration of this species is more effective in shadowed environments. Due to the large number of individuals sampled in different size classes, the Iguaçu National Park is an important conservation remaining of A. angustifolia.Keyword: Density canopy; mixed temperate rain forest; spatial distribution; regeneration.  ResumoEstrutura populacional de Araucaria angustifolia no Parque Nacional do Iguaçu. O objetivo do presente trabalho foi analisar a estrutura populacional, regeneração e distribuição espacial de Araucaria angustifolia (Bertol.) Kuntz no interior de uma floresta natural e na borda de uma floresta com monocultura agrícola. Todos os indivíduos de araucária a partir de 10 cm de altura foram registrados em 200 parcelas de 10 x 10 m, sendo amostrados 479 indivíduos (416 na borda e 63 no interior). Desses, 33 eram fêmeas, 37 machos, 49 juvenis e 360 regenerantes. A estrutura da população apresentou padrão semelhante ao J-invertido. Os indivíduos regenerantes apresentaram principalmente o padrão agregado de distribuição, já para os juvenis, machos e fêmeas o padrão foi uniforme. A densidade do dossel influenciou a frequência de indivíduos, sendo observadas maiores frequências em maiores densidades, indicando que a regeneração da espécie é mais efetiva em ambientes sombreados. Devido ao grande número de indivíduos amostrados em diferentes classes de tamanho, o Parque Nacional do Iguaçu representa um importante remanescente na conservação de A. angustifolia.Palavras-chave: Densidade do dossel; Floresta Ombrófila Mista; distribuição espacial; regeneração.

A structural analysis of rain forest at Korup and Douala–Edea, Cameroon

1996 ◽  
Vol 104 ◽  
pp. 177-224 ◽  
Author(s):  
D. McC. Newbery ◽  
J. S. Gartlan
Keyword(s):  
Spatial Distribution ◽  
Tree Species ◽  
Rain Forest ◽  
National Park ◽  
Individual Species ◽  
Forest Reserve ◽  
Frequency Distributions ◽  
Relative Lack ◽  
Large Size ◽  
Group 5

SynopsisDiameter frequency distributions (dfds) of 197 tree species in Korup National Park and 118 tree species in Douala–Edea Forest Reserve (based onc.41 000 and 25 000 trees ≥ 30 cm gbh in 135 and 104 plots along four transects at each site, respectively) were individually classified into four groups of species according to their maximum diameters (≥99% trees <50, <70 and <90cm dbh, and > 1% ≥90cm dbh), and separated into two abundance classes (n≥50 andn= 20–49 (or 15–49). A fifth group, from those species in 3 and 4, was defined by a relative lack of small stems and given detailed attention. Dfds were evaluated for all species together on a transect and site basis, and compared for individual species across transects, and between sites for those group 5 species in common.Analysis focussed on three large ectomycorrhizal species in groups 3 and 4,Microberlinia bisulcata, Tetraberlinia bifoliolataandT. moreliana(Caesalpiniaceae), which were restricted to, and dominated, the forest on the nutrient-poor soils of transect P at Korup.M. bisulcata, the most abundant, was markedly group 5 in character, with very few small trees, whilst theTetraberliniaspecies had strong replacement potential. Although there were 27 species (42% of groups 3 & 4) at Korup and 19 (48%) at Douala–Edea in group 5,M. bisulcatawas unique in its combination of large size, dfd, mycorrhizal habit, spatial distribution and soil association. The potential replacement of this species was contrasted also with a non-ectomycorrhizal caesalp with similar dfd that occurred on nutrient-richer soils,Erythrophleum ivorense.Knowledge of the Caesalpiniaceae-richla forêt biafriéeneof Letouzey (which includes Korup and Douala–Edea) is reviewed, and the distribution, ecology and regeneration of the caesalps discussed. Structure and inferred dynamics of the forest at Korup are discussed with special regard to the ectomycorrhizal species.

scholarly journals Hunting of Preusss red colobus (Procolobus preussi) in Korup National Park, Cameroon

2018 ◽  
Vol 10 (2) ◽  
pp. 100-105
Author(s):  
Nguedem Fonkwo Sylvie ◽  
Mbida Mpoame ◽  
Evaristus Angwafo Tsi ◽  
Buh Ebua Valentine
Keyword(s):  
National Park ◽  
Red Colobus ◽  
Korup National Park

scholarly journals Spatial distribution pattern of Tarsius Lariang in lore lindu national park

2019 ◽  
Vol 13 (2) ◽  
pp. 606 ◽  
Author(s):  
Abdul Rosyid ◽  
Yanto Santosa ◽  
I Nengah Surati Jaya ◽  
M. Bismark ◽  
Agus P. Kartono
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Land Surface ◽  
National Park ◽  
Spatial Distribution Pattern ◽  
Systematic Sampling ◽  
Affecting Factors ◽  
Factors Affecting ◽  
Insect Abundance ◽  
Lore Lindu National Park

<p><span>Tarsius lariang (T. lariang) is an endemic species in Lore Lindu National Park (LLNP). Available information regarding T. lariang is limited to only morphological, anatomical, cytogenetic, and voices issues. Knowledge for its geospatial characteristics such as spatial preferences and spatial distribution is rare. The main objective of this study is to identify the spatial distribution pattern of T. lariang in LLNP. An additional objective is to identify the environmental factors affecting its spatial distribution patterns. Field observation for distribution pattern was done at the observation plot that were using systematic sampling with random start. Furthermore, the density estimation in each point was calculated using Triangle Count and Concentration Count method, while insect abundance was estimated using light traps sample data. Finally, spatial pattern was estimated using nearest neighbor index, while the environmental affecting factors were identified by using spatial analysis and correlation analyses. From 45 observation points, the T. lariang distribution pattern was clumped. It is also recognized that the significant factors affecting the spatial distribution were insect abundance, proximity from the commercially utilized land, and land surface temperature.</span></p><p> </p>

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