scholarly journals A 17 Year Successional Enrichment Plantation of Tree Recruitment and Restoration in an African Tropical Forest

2021 ◽  
Author(s):  
Bernard Eromosele Omomoh ◽  
Gbenga Festus Akomolafe ◽  
Leah Spencer Brown ◽  
VAJ Adekunle
Keyword(s):  
Species Richness ◽  
Statistical Analysis ◽  
Tropical Forest ◽  
Tree Species ◽  
Forest Regeneration ◽  
Forest Trees ◽  
Growth Forms ◽  
Forest Reserve ◽  
Tree Species Composition ◽  
Enrichment Planting

Abstract Key message: The Enrichment Plantation of Akure Forest Reserve is one of the forests currently experiencing a 17-year-long post-disturbance following deforestation and fragmentation in Nigeria. Context: To better understand the contribution of enrichment planting on forest regeneration and restoration, when the Enrichment Plantation after 17 years of post-disturbance was examined. Aims: We studied the recruitment drive of aboveground and undergrowth stands of an Enrichment Plantation in the tropical forest reserve. We assess the trees diversity, species compositions, species richness, and growth forms of the vegetations. Methods: A total of 3(50m x50m) plots were sampled. A total of 47 aboveground tree species and 45 undergrowth stands from Enrichment Plantation were identified. A statistical analysis were used to quantified the data obtained from this resultsResults: The result shows an increase in the diversity and an even distribution of the species of the aboveground forest trees, compared to the undergrowth stands. Conversely, the aboveground forest trees have lower species richness as compared to the level of undergrowth stands. The sapling density was significantly higher than the aboveground tree of the. It was also observed that the aboveground forest trees and undergrowth stands are somewhat similar in species compositions, which implies that sapling recruitment is a key determinant of the tree species composition of the forest.Conclusion: It is then concluded that the method adopted for restoration encouraged species diversity in this successional forest among the aboveground trees species and undergrowth.

scholarly journals Tree Species Composition and Diversity in Oban Forest Reserve, Nigeria

2014 ◽  
Vol 3 (1) ◽  
pp. 10 ◽  
Author(s):  
Humphrey Igbinosa Aigbe ◽  
Godwin Ejakhe Omokhua
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Tree Species ◽  
Basal Area ◽  
Growth Cycle ◽  
Forest Growth ◽  
Population Densities ◽  
Individual Tree ◽  
Forest Reserve ◽  
Tree Species Composition

Tree species composition and diversity were assessed in Oban Forest Reserve. Three stage sampling procedure was used to collect data on tree parameters – diameter at breast height (dbh); diameters over bark at the base, middle and top; merchantable height and total height using a minimum dbh limit of ≥10 cm in the tertiary sample plots. A total of 808 trees were measured and 72 species identified in the study area. Stand level parameters were estimated and tree diversity assessed. Results indicate that an average number of stems encountered per hectare were 306. Population densities of individual tree species ranged from 1 to 22 ha-1. Population densities of species were poor. The basal area/ha estimated is 34.67m2 and the species richness index obtained was 10.605, which indicate high species richness. The value of Shannon’s Index (HI) is 3.795 which is quite high.The results show that the forest reserve is a well-stocked tropical rainforest in Nigeria. The relative richness of the forest reserve in terms of individual tree species does not correlate well with the abundance because the abundance of each of the species was quite low and density poor. While there is paucity of most species, Staudtia stipitata was the most abundant (22 tree/ha). The forest has reverted back to the turbulent agrading stage of the forest growth cycle. 

scholarly journals The Impacts of Land Use and Forest Activities on Tree Species Composition and Structure on the Edges of Budongo Forest Reserve, Uganda

2010 ◽  
Vol 3 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Jacob Godfrey Agea ◽  
Clement Akais Okia ◽  
Refaat Atalla Ahmed Abohassan ◽  
James Munga Kimondo ◽  
Susan B. Tumwebaze ◽  
...  
Keyword(s):  
Land Use ◽  
Species Composition ◽  
Tree Species ◽  
Forest Reserve ◽  
Tree Species Composition ◽  
Budongo Forest Reserve ◽  
Composition And Structure ◽  
Budongo Forest ◽  
Species Composition And Structure ◽  
Forest Activities

scholarly journals Relationships between Plant Biodiversity and Soil Fertility in a Mature Tropical Forest, Costa Rica

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Martin B. Nadeau ◽  
Thomas P. Sullivan
Keyword(s):  
Species Richness ◽  
Costa Rica ◽  
Soil Fertility ◽  
Tropical Forest ◽  
Tree Species ◽  
Plant Biodiversity ◽  
Total N ◽  
Fertility Index ◽  
Tree Species Richness ◽  
Soil Fertility Index

We aimed to study relationships between plant biodiversity and soil chemical fertility in a mature tropical forest of Costa Rica. Soil samples were collected in nine sampling plots (5 m by 25 m) in order to identify P, K, Ca, Mg, Fe, Zn, Mn, Cu, and Al and total N contents, soil fertility index, CEC, pH, and C/N ratio. Furthermore, species richness, Shannon-Wiener and Simpson’s species diversities, structural richness, and structural diversity were calculated for each plot. Simple linear regression analyses were conducted. Tree species richness was inversely related to concentration levels of K, Ca, and P, CEC, and soil fertility index. Therefore, higher tree species richness tended to be found on sites with lower soil fertility, which is the complete opposite of temperate forests. As a result, tropical and temperate forest ecology should be considered separately. Shannon-Wiener tree species diversity was positively correlated to C/N ratio. Herb structural richness was positively correlated with soil fertility index and P concentration. Therefore, herb structural richness may be a good indicator of soil fertility. This study gives important insights on ecological relationships between plant biodiversity and soil chemical fertility in a primary tropical forest.

scholarly journals More widespread alien tree species do not have larger impacts on regeneration of native tree species in a tropical forest reserve

2020 ◽  
Vol 10 (11) ◽  
pp. 5034-5044
Author(s):  
Samson Aman Samson Kiswaga ◽  
John Richard Mbwambo ◽  
Deo Shirima ◽  
Ahmed S. Mndolwa ◽  
Urs Schaffner ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Tree Species ◽  
Forest Reserve ◽  
Native Tree ◽  
Native Tree Species

The effects of tree age and tree species composition on bird species richness in a Central European montane forest

Biologia ◽  
2015 ◽  
Vol 70 (11) ◽  
Author(s):  
Tomáš Birčák ◽  
Jiří Reif
Keyword(s):  
Species Richness ◽  
Tree Species ◽  
Forest Type ◽  
Bird Species ◽  
Montane Forest ◽  
Tree Age ◽  
Tree Species Composition ◽  
Bird Species Richness ◽  
Number Of Species ◽  
Study Sites

AbstractLarge areas of montane forests are commercially harvested, while some other parts remain unmanaged. These conditions provide an opportunity to study the response of bird communities to forest management. Here we focused on the effects of tree species composition and tree age on bird species richness. We counted birds in two types of montane forest (beech and mixed) replicated in three age classes (managed 55-65 years, managed 85-95 years, unmanaged over 200 years) in the Vtačnik Mountains, Slovakia. Number of bird species at individual study sites (local richness) was predicted solely by the tree age and not by the forest type. Specifically, the number of species was highest in the oldest stands, while the stands of 55-65 and 85-95 years did not differ from each other. By contrast, forest type seems important for total bird species richness (number of species recorded in all study sites of a given type) with more species recorded in mixed forests than in beech forests. The local richness seems thus limited by the amount resources available at a given site, which is highest in the oldest stands irrespective to forest type, probably due to largest amount of food, dead wood or tree cavities, being particularly suitable for habitat specialists. However, larger species pool in mixed forest, enriched by birds adapted to coniferous trees, increases the total number of species observed in this type. We thus recommend to shift the harvest to the highest possible age and to include some other tree species into parts of beech monocultures.

scholarly journals Comparison of forest regeneration in two sites with different primate abundances in Northwestern Ecuador

2016 ◽  
Vol 64 (2) ◽  
pp. 493 ◽  
Author(s):  
Bayron R. Calle-Rendón ◽  
Mika Peck ◽  
Sara E. Bennett ◽  
Citlalli Morelos-Juarez ◽  
Felipe Alfonso
Keyword(s):  
Species Richness ◽  
Tree Species ◽  
Forest Regeneration ◽  
Tree Diversity ◽  
Primate Species ◽  
Species Accumulation Curves ◽  
Dispersal Syndrome ◽  
Species Accumulation ◽  
Accumulation Curves ◽  
Understory Tree

There is increasing evidence that large-bodied primates play important roles as seed dispersers and in the maintenance of tree diversity in forest ecosystems. In this study we compared forest regeneration at two sites with differing primate abundances in the Ecuadorian Chocoan rainforest. We predicted: (1) significant differences in primate abundance between the two sites; (2) higher understory tree species richness and density at the site with greater primate abundance; (3) the site with lower primate abundance characterized by tree species dispersed by non-primate biotic agents and/or abiotic factors. We compared two sites, Tesoro Escondido (TE) a campesino cooperative, and the El Pambilar (EP) wildlife refuge that both maintain populations of mantled howler monkey (Alouatta palliata), the brown-headed spider monkey (Ateles fusciceps fusciceps) and the capuchin monkey (Cebus capucinus). We characterized canopy structure by point-quadrant sampling, determined primate abundance and sampled seedlings/saplings in 1 m2 plots, classifying tree species based on three dispersal syndromes: adapted for primate dispersal, dispersed by other biological agents, and abiotic dispersal. We compared sites in terms of primate abundance (groups and individuals observed per day) and regeneration characteristics (overall density, species richness, and dispersal syndrome). We carried out within site comparisons and constructed understory tree species accumulation curves. Overall the forests were structurally similar - with significantly higher densities of A. f. fusciceps at TE. Encounter rates for the other two primate species were similar at both sites. Understory tree density and species richness was significantly higher in TE with no stabilization of tree species accumulation curves. The species accumulation curve for understory trees at EP stabilized. Higher densities and species richness of primate dispersed tree species were observed at TE, with non-primate biotically dispersed tree species the dominant dispersal syndrome at both sites. Our observations are consistent with those from other studies investigating the role of large-bodied frugivorous primates in forest regeneration, and point to a general pattern: future lowland tropical forest tree diversity depends on maintaining robust populations of large primate species in these systems. It is highly probable that the maintenance of high levels of tree diversity in Chocoan rainforests is dependent on the conservation of its largest resident primate, the critically endangered brown-headed spider monkey (A. f. fusciceps).

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