A comparison of soil properties under different landuse types in a part of the Nigerian cocoa belt

Adejuwon, J. O.; Ekanade, O.

doi:10.1016/0341-8162(88)90054-9

Cited by 76 publications

(46 citation statements)

References 8 publications

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“…Similar to the longitudinal studies, chronosequences tended to show non-linear declines in topsoil properties with time since forest conversion to agriculture. Soil infiltrability [93], SOM [93,102,106], Soil P [103], pH [102,107], and total C and N [107,108] all showed marked declines in cultivated compared to forested baselines.…”

Section: Chronosequences (Space-for-time)mentioning

confidence: 97%

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The State of Soil Degradation in Sub-Saharan Africa: Baselines, Trajectories, and Solutions

et al. 2015

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Abstract:The primary cause of soil degradation in sub-Saharan Africa (SSA) is expansion and intensification of agriculture in efforts to feed its growing population. Effective solutions will support resilient systems, and must cut across agricultural, environmental, and socioeconomic objectives. While many studies compare and contrast the effects of different management practices on soil properties, soil degradation can only be evaluated within a specific temporal and spatial context using multiple indicators. The extent and rate of soil degradation in SSA is still under debate as there are no reliable data, just gross estimates. Nevertheless, certain soils are losing their ability to provide food and essential ecosystem services, and we know that soil fertility depletion is the primary cause. We synthesize data from studies that examined degradation in SSA at broad spatial and temporal scales and quantified multiple soil degradation indicators, and we found clear indications of degradation across multiple indicators. However, different indicators have different trajectories-pH and cation exchange capacity tend to decline linearly, and soil organic carbon and yields non-linearly. Future research should focus on how soil degradation in SSA leads to changes in ecosystem services, and how to manage these soils now and in the future. OPEN ACCESS

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Section: Chronosequences (Space-for-time)mentioning

confidence: 97%

“…However, a growing body of research in SSA uses the same study design to examine land management practices that may improve soil conditions (aggrade soils) from a degraded baseline. Such practices include (but are not limited to) communal grazing [126,127], tree plantations [93,128], and fallowing [96,129].…”

Section: Positive Trajectories and Conclusionmentioning

confidence: 99%

The State of Soil Degradation in Sub-Saharan Africa: Baselines, Trajectories, and Solutions

et al. 2015

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“…The computed soil DI reflects the impacts of land management on the studied soil properties compared to the respective reference sites [34,35]. The higher the DI value, the higher the soil deterioration and vice versa.…”

Section: Fertilization Type On Soil Microbial Biomass Indicatorsmentioning

confidence: 99%

Impacts of Fertilization Type on Soil Microbial Biomass and Nutrient Availability in Two Agroecological Zones of Ghana

et al. 2017

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Abstract:The decline in soil productivity amidst efforts to increase crop yield in Sub Saharan Africa (SSA) has made it imperative to assess the current fertilization management approaches. This study was conducted in two agroecological zones (i.e., Guinea Savannah (GS) and Deciduous forest (DF)) of Ghana to evaluate how different fertilization schemes in the long term (>5 years) impacted the soil biochemical properties. Soil samples under four fertilization schemes (inorganic fertilizer only, low-to-medium organic residues only, inorganic fertilizers plus low-to-medium organic residues, and no fertilization) from 20 farmers' field were sampled from March to April 2015. Soil biochemical quality indicators were determined using standard procedures. Overall, the average chemical and microbial biomass contents for most indicators were significantly higher in DF compared to GS. Relative to the reference sites, soil quality improvement were observed under inorganic fertilization in both agroecologies in contrast to significant soil deterioration (26.5%) under sole organic residue application in GS. Furthermore, the results showed that increased inorganic fertilization rate alone or combination with organic residues improved soil quality relative to the reference. The present results suggest the need to raise the current fertilizer application rates, especially in GS in order to enhance optimum soil productivity.

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“…It also lends credence to the hypothesis of Bilsborrow (1994) that deforestation is largely due to intensification of agriculture, involving clearing the land of trees to plant crops. Although taungya system, which was encouraged by the Forestry Department, has been noted to be similar in its physiognomic appearance to forest ecosystem (Adejuwon & Ekanade, 1988), its cover closure is obviously not the same as mature or high forest. Adams (1978) and Chijioke (1980) also reported that total biomass removal, which invariably is the practice in tree harvesting for industrial use accounts for a tremendous loss in the nutrient status of the soil environment in the forest region.…”

Section: Ecological Implications Of Land Usementioning

confidence: 99%

Forest Cover Changes and Land Use Dynamics in Oluwa Forest Reserve, Southwestern Nigeria

Orimoogunje

2014

Journal of Landscape Ecology

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This study examined the extent of resource use and the level of degradation consequent upon land use. Three distinctive trends were observed in terms of forest and land cover dynamics. These are forest degradation, deforestation and regeneration. The paper integrated both, topographical map of 1969 and satellite imageries from Landsat MSS 1972, and Landsat TM 1991 with ground truthing and socio-economic surveys to assess changes in forest resource use and land cover in South-western Nigeria. The satellite images were analysed using ILWIS software version 3.4. Based on ground truth data and remotely sensed data, the study area was classified into five categories using the supervised maximum likelihood classification technique. The accuracy assessment was carried out on the remotely sensed data. A total of 30 points for each dataset were selected for this operation and the overall accuracy of 90%, 86.7% and 85% respectively was obtained from the three image datasets. Results showed three dominant ecological communities in Oluwa Forest Reserve while two effects of changes on species were identified. The first was the replacement of what could be considered as the original species by other species tolerant to the 'new' ecosystem. The other was the reduction in the range of the original species that could be found. This was an indication that the area had been fragmented comparing to its original status. Results suggest that resource utilization and land cover change dynamically over time. The study also revealed that the creation of forest reserve to restrict local access and resource use would have been an effective tool for regulating encroachment and logging activities if there was an effective enforcement of regulation. It is therefore obvious that the main aim of environmental management should be the protection of the natural living space of humankind and integration of environmental scarcity in making decision on all economic issues and activities.

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A comparison of soil properties under different landuse types in a part of the Nigerian cocoa belt

Cited by 76 publications

References 8 publications

The State of Soil Degradation in Sub-Saharan Africa: Baselines, Trajectories, and Solutions

The State of Soil Degradation in Sub-Saharan Africa: Baselines, Trajectories, and Solutions

Impacts of Fertilization Type on Soil Microbial Biomass and Nutrient Availability in Two Agroecological Zones of Ghana

Forest Cover Changes and Land Use Dynamics in Oluwa Forest Reserve, Southwestern Nigeria

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