A Study of Variation in Physiognomic Characteristics of Guinea Savanna Vegetation

Jibrin, Abdullahi

doi:10.5539/enrr.v3n2p52

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…Since abundance of herbs and shrubs undergrowth favour higher organic carbon stock (Jaiyeoba, 1995;1998;Lal, 2002;Anikwe et al, 2003), the higher organic carbon content of the forest reserve reflects a high organic matter turn over due to conservation and fewer disturbances through tillage and harvesting operations (Jaiyeoba, 1995). It is noteworthy that bush burning, logging, harvesting of Non Timber Forest Products, shifting cultivation and grazing in the savannas substantially reduce carbon stock (Jibrin, 2013;Jibrin, 2017), and determine the species composition to a large extent (Jibrin and Jaiyeoba, 2013). However, where there is effective protection from fire, deforestation and grazing these areas could become savanna woodland forests having high biomass density; with substantial carbon stock (Grace et al 2006;Jibrin et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Analysis of carbon stock density in protected and non- protected areas of Guinea Savanna in Niger State, Nigeria

Jibrin¹,

Jaiyeoba²,

Oladipo³

2019

Bayero J. Pure App. Sci.

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Quantification of carbon stock has gained major attention in international climate change mitigation and adaptation negotiations. However, poor knowledge of the quantity of carbon stock in respective ecosystems is one major challenge in estimating carbon stock in developing countries. This study is aimed at estimating and comparing carbon stock density of protected (forest reserve) and non-protected (parkland) areas of guinea savanna in Niger state. The research methodology includes field survey inventory, biometric measurements and laboratory analysis. At each of the 45 sampling plot locations, Carbon stock was measured from six pools viz above ground tree, undergrowth, dead wood, litter, root and soil. within a quadrat sampling plot of 500 m 2 . Four fixed size square frames encompassing 1m 2 was used for the undergrowth (shrubs and grasses) and litter. Composite soil samples (for organic carbon) and undisturbed samples (for bulk density) were taken from each of the 1m 2 subplot quadrants at two depths (0-15cm and 15-30cm). Soil organic carbon concentration was estimated in the laboratory using Walkley-Black method. The findings of the study revealed that in terms of carbon stock in respective pools, in both protected and non-protected areas, soil pool was the highest, followed by tree and undergrowth; while litter, dead wood and root were the least in carbon stock. The average aggregate carbon stock density in the protected area is 118.2 Mg ha -1 which is greater than 69.3 Mg ha -1 recorded in the nonprotected area. It was also observed that there is significant difference in carbon stock density between the forest reserve and parkland study sites where t (43) = 18.34, p < 0.001). The study concludes that if savannas were to be protected from fire, grazing and anthropogenic disturbances, most of them would accumulate substantial carbon and the sink would be larger; with a view to mitigating climate change effect.

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Section: Resultsmentioning

confidence: 99%

Analysis of carbon stock density in protected and non- protected areas of Guinea Savanna in Niger State, Nigeria

Jibrin¹,

Jaiyeoba²,

Oladipo³

2019

Bayero J. Pure App. Sci.

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“…Unlike the forests, the savanna vegetation is hardly arranged in different vertical layers, especially the more open vegetation in the northern part of the inventory area. The graminaceous layer is the most prominent element of the savanna ecological system (Jibrin, 2013;Buba, 2015). Almost all human and faunal activity is concentrated in this layer.…”

Section: Characteristics Of Savanna Biomementioning

confidence: 99%

“…• Predominance of grasses Two factors common to all savannah environments are annual variations in rainfall and dry season wildfires (Muoghalu, and Isichei, 1991;Staver, 2011;Jibrin, 2013;Moncrieff et al, 2016).…”

Section: Characteristics Of Savanna Biomementioning

confidence: 99%

“…• Adaptations to water stress: The growth of savanna plants tends to occur mostly during the wet season with senescence or dormancy in the dry season prone to fires, a characteristic that facilitates persistence under adverse conditions. Most herbaceous species flower in the wet season, although in contrast, many woody species flower in the dry season (Jibrin, 2013;Hutley and Setterfield, 2018). ➢ Deciduous species need to acquire enough nutrient and photosynthate to ensure persistence and reproduction during the wet season, whereas evergreen species tend to have slower growth rates but persist throughout the seasonal cycle.…”

Section: Adaptive Traits Of Savanna Vegetationmentioning

confidence: 99%

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Savanna Biomes In Nigeria: Indicatzor Species And Plant Adaptation Strategies

Adedibu

OPEYEMI

LAWRENCE

et al. 2022

Preprint

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Savannas are considered an exclusively tropical biome, largely found in Africa. It comprises of grasslands with scattered trees that are sufficiently widely spaced so that the canopy does not close. The savanna biome covers more than 86% of Nigeria's vegetation cover. There are three major savanna belts in Nigeria, namely: the Guinea savanna, the Sudan savanna, and the Sahel savanna. The Guinea savanna is the most extensive ecological zone, covering more than half of the country’s land area. It has typically short trees and tall grasses and is the most luxuriant of the Savannah vegetation belts in Nigeria. The Sudan savanna belt is found in the northern parts of Nigeria. The Sudan savanna is characterised by high rainfall variability, frequent droughts, and poor soil fertility. The Sahel savanna is found in the extreme northwest and northeast of the country. It has sparse vegetation that is dependent on uncertain rainfall, dominantly grasses with discontinuous shrubs and scattered trees, which are often thorny, and extensive sparse grasses. Savannah plants are faced with some delimiting factors, such as seasonal drought, low water and nutrient availability, the impacts of regular fire, and herbivory, among others, which threaten their survival. This article discusses the Savanna biome in Nigeria, its indicator species, and the adaptative features exhibited by plants in the savanna to ensure their survival.

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“…2004, Leblanc 2014. La structure végétale s'intéresse à la fois à la distribution et à la dynamique des espèces, aux caractéristiques dendrométriques (diamètres, hauteurs, volumes), à la stratification et au recouvrement (Jibrin 2013). La description des caractéristiques individuelles des tiges et la mise en évidence des strates, constituent des paramètres d'évaluation de la stabilité, de la dégradation ou de la limitation de la résilience des peuplements (Thompson & al.…”

Section: Introductionunclassified

Caractérisation structurale de la végétation ligneuse du Parc National de Mozogo-Gokoro (Cameroun)

Sandjong¹,

Ntoupka²,

Vroumsia³

et al. 2018

FVSS

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La gestion forestière durable est étroitement dépendante de la compréhension de la dynamique structurale. Cette étude vise la description de la structure de la végétation ligneuse du Parc National de Mozogo-Gokoro, situé en zone soudano- sahélienne au Cameroun. À l’issue d’un inventaire floristique, prenant en compte tous les individus ligneux, les analyses ont porté sur les paramètres suivants: la structure diamétrale, les types de tiges, la répartition en classes de hauteurs, les types biologiques et les types végétatifs. Ces différentes formes de caractérisation ont prouvé globalement le vieillissement du peuplement. Les pourcentages des types végétatifs montrent une végétation dominée par les arbustes (63,12 %), mais avec une présence non négligeable de lianes (26,34 %) et d’arbres (10,54 %). À partir des tests de corrélations diamètres-hauteurs, le paramètre types de tiges, avec une domination des hautes (1521 tiges/ha) et moyennes tiges (733 tiges/ha), est démontré plus crédible dans l’étude de la structure intégrale de la végétation ligneuse. L’analyse structurale des espèces présente quant à elle des tendances, montrant l’importance de l’ensemble des paramètres et une divergence dans les pressions subies. En somme, dans le processus de gestion durable du parc, la régénération et la croissance des ligneux se manifestent comme une préoccupation concernant l’ensemble du peuplement, mais de façon plus ciblée suivant les espèces.

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A Study of Variation in Physiognomic Characteristics of Guinea Savanna Vegetation

Cited by 5 publications

References 13 publications

Analysis of carbon stock density in protected and non- protected areas of Guinea Savanna in Niger State, Nigeria

Analysis of carbon stock density in protected and non- protected areas of Guinea Savanna in Niger State, Nigeria

Savanna Biomes In Nigeria: Indicatzor Species And Plant Adaptation Strategies

Caractérisation structurale de la végétation ligneuse du Parc National de Mozogo-Gokoro (Cameroun)

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