La pandémie du covid-19 et son impact économique sur le secteur privé de l’enseignement supérieur au Congo Brazzaville

Makany, Luyindula G. Davy; Batchi, Macaire; Makany, Roger Armand

doi:10.3917/rcg.031.0013

Cited by 4 publications

(7 citation statements)

References 3 publications

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“…The soils, which are generally attributed to ferralsols (Jones et al, 2013), are mainly deep, sandy in texture and ferralitic, providing rapid drainage (Makany, 1976). Vegetation in the area belongs to moist Central African forests (Fayolle et al, 2014) and specifically to mesophilic forests dominated by semi-deciduous species (Makany, 1976). The forest canopy is dominated by species of The prevalent land use is subsistence agriculture, gathering, fishing and hunting (Rayden et al, 2014).…”

Section: Study Sitementioning

confidence: 99%

Natural forest regeneration over a fallow age chronosequence in central African moist forests

Loubota Panzou,

Mankessi,

Tsiba Ngambou

et al. 2024

Afr J Ecol

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A better understanding of the natural regeneration in tropical forests could help develop more effective restoration strategies. This study examined relationships in structural and diversity attributes of natural regeneration in five forest fallow ages after slash‐and‐burn agriculture (6 months, 2 years, 5 years, 10 years, and 15 years) in the Republic of Congo. For each fallow age, all stems with a diameter ≥1 cm and below 5 cm (height ≥ 130 cm), corresponding to natural forest regeneration, were identified to the species level, and measured (diameter and height) in 12 plots (10 m × 10 m). Three structural attributes (stem density, maximum diameter, and maximum height) and five diversity indices (species richness, Shannon diversity, Simpson diversity, Fisher's alpha and Pielou's evenness) were estimated at the plot level. Our results revealed an increase in structural and diversity attributes with fallow ages, except stem density. The young fallow (6 months, 2 years and 5 years) had greater stem density (61 ± 48 stems), while the old fallow (10 years and 15 years) had higher maximum height (5.39 ± 2.36 m) and Shannon's index (0.94 ± 0.18). These results provided new insights into natural regeneration between young and old secondary forests.

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Section: Study Sitementioning

confidence: 99%

Natural forest regeneration over a fallow age chronosequence in central African moist forests

Loubota Panzou,

Mankessi,

Tsiba Ngambou

et al. 2024

Afr J Ecol

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“…The annual rainfall varies from 1200 to 1400 mm/year and undergoes great variations according to the years [31]. On the other hand, the climate of the Mbe savannah is of the Guinean sub-equatorial type, and is characterized by rainfall ranging from 1600 to 2100 mm/year [15]. Average annual temperatures are between 23˚C and 25˚C.…”

Section: Study Sites and Soil Samplingmentioning

confidence: 99%

“…Overall, it's about the Inkisi sandstones and the polymorphic sands [32]. However, the soils of the Mbe "MB" savannah are generally sandy to sandy clay [15].…”

Section: Study Sites and Soil Samplingmentioning

confidence: 99%

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Soil Seed Bank Characteristics of the Mbe and Nguela Shrub Savannas, and Implications for the Reforestation, Republic of Congo

Douh,

Moussoumbou,

Mabengo

et al. 2023

OJE

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The soil seed bank is an important source of restoration and resilience of disturbed ecosystems. This study evaluates the regeneration potential through the soil seed bank of the shrub savannas of Nguela and Mbe in order to predict the eventual dynamics. Three plots of 0.25 ha subdivided into four sub-plots of 0.015 ha have been installed in each savannah. In total, 48 samples of each savannah, i.e. 96 samples of both savannas, have been taken from the soil layers, 0 -5 cm, 5 -10 cm, 10 -15 cm and 15 -20 cm. Species diversity and abundance of the soil seed bank have been assessed after germination. The results reveal 167 seedlings belonging to 23 species in the Mbe savannah and 144 seedlings belonging to 14 species in the Nguela savannah. The total densities of the germinated seeds were respectively 463.63 seeds/m 2 and 400 seeds/m 2 . Nevertheless, the 20 cm deep layers have illustrated themselves compared to the superficial layers with densities of 16.29 seeds/m 2 and 21.66 seeds/m 2 , respectively, in the savannas of Mbe and Nguela. Herbaceous species largely dominated, with percentages of 91% and 100%, respectively, in the savannas of Mbe and Nguela. Alone, the Trema orientalis (L.) Blume species has been identified as woody species in the Mbe savannah. The greatest specific richness has been obtained in the first five centimeters of soil, with 21.73% and 28.57% of exclusive species, respectively, in the savannas of Mbe and Nguela. The results reveal that restoration through the soil seed bank would be limited to a single woody species found (T.

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“…The minimum varies from 50 to 60%, while the maximums are between 88 and 94%. Evaporation has a relative maximum from February to March and an absolute maximum between August and September [27].…”

Section: Presentation Of the Study Areamentioning

confidence: 99%

Trees Supplies and the Relevance of Ecosystem Services in Brazzaville Urban Environment

2023

WJFR

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The study of the contributions of the trees of court and the relevance of the ecosystem services was carried out in Brazzaville in the district 7 Mfilou. This research, which contributes to the floristic knowledge of the environment, promotes the goods and ecosystem services provided to humanity. The methodology is based on a literary review, a floristic inventory of plots and ethnobotanical surveys involving the populations. The criterion for the selection of surveyed plots is to have at least two trees of diameter at breast height (dbh) ≥ 10 cm. The floristic inventory counted 1655 trees for 45 species and 26 families. Mangifera indica is the dominant species and Fabaceae the most diverse. Backyard trees provide a food, economic, phytotherapeutic and environmental contribution. In addition to this contribution, fourteen ecosystem services grouped into three categories (provisioning, regulatory and socio-cultural) are identified. Data from ethnobotanical indices highlight the adherence of populations to the material and immaterial values of urban forestry. The duality of man and his environment, the fruit trees are plebiscited and the resilience of the city collects the major fraction of the frequencies of citations. Urban arboriculture, despite its paucifloristic character, is a source of biodiversity that sometimes underlies socio-cultural values.

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La pandémie du covid-19 et son impact économique sur le secteur privé de l’enseignement supérieur au Congo Brazzaville

Cited by 4 publications

References 3 publications

Natural forest regeneration over a fallow age chronosequence in central African moist forests

Natural forest regeneration over a fallow age chronosequence in central African moist forests

Soil Seed Bank Characteristics of the Mbe and Nguela Shrub Savannas, and Implications for the Reforestation, Republic of Congo

Trees Supplies and the Relevance of Ecosystem Services in Brazzaville Urban Environment

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