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EN
The Forest of Upper Alibori is subject to strong agricultural and pastoral pressures from year to year despite the implementation of a forest management plan. It is therefore appropriate to conduct an integrated and spatialized analysis of the effects of these pressures on plant biodiversity from a spatial planning perspective. The research objective is to establish a multi-criteria zoning of the Upper Alibori Forest Reserve that can reconcile biodiversity conservation and sustainable agropastoral exploitation. A methodological approach based on geomatics was adopted. Hierarchical multi-criteria analysis and cross-layer analysis are the main techniques adopted. The state of plant biodiversity, one of the important criteria for multi-criteria zoning. The intersection of the scientific zoning and the zoning proposed by the riparian population shows a similarity of 54%. In the central core, the similarity between the two types of zoning is 32%. Spatially, this similarity is observed along the Alibori River. At the level of the agricultural series, the two zonings show a similarity level of 23%. The elaboration of an integrated zoning made it possible to distinguish several management series. The management series delimited are made up of the central core (32%), the protection series (11%), the production series (17%), the scientific research series (2%), the service series (2%) and the agropastoral and reforestation series (36%). The implementation of such zoning is the responsibility of the forest administration.
EN
Publication shows information of systems of production of cotton fibres in Benin (West Africa). Cotton is the main source of profit a lot of pure African countries. It is also shown danger and consequences of massive production of cotton fibres for human natural environment and ecosystems.
EN
Publication shows information on systems of production of cotton fibres in Benin (West Africa). Cotton is the main source of profit a lot of pure African countries. It is also shown danger and consequences of massive production of cotton fibres for human natural environment and ecosystems.
EN
Publication shows information on systems of production of cotton fibres in Benin (West Africa). Cotton is the main source of profit a lot of pure African countries. It is also shown danger and consequences of massive production of cotton fibres for human natural environment and ecosystems.
5
Content available remote Assessment of heavy metal pollution in roadside sediments in Benin City, Nigeria
EN
Heavy metal pollution levels in roadside drains (gutters) along minor and major motorways in Benin City is evaluated using 23 surface sediment samples from roadside drains. The following trace metals: Pb, Zn, Ni, Cr and Cu were studied. Results of univariante statistical analyses indicate a generally high trace metal concentration in all areas. The concentrations of Pb and Cu are particularly high in sediments from high density motorways. Medium and high density motorways sediments do not differ much in their Zn and Ni concentrations. The heavy metal Cr shows no glaring difference in concentration levels for all types of motorways. Multivariante technique involving cluster analysis classified the sample into three distinct groups corresponding to the type of motorways and approximate geographic location of the sampled areas. Anomalous concentrations of heavy metals in roadside drains are a source of worry since Benin City sits on the top of a prolific phreatic aquifer which is potentially vulnerable to high level of pollution
PL
Określono stężenia metali ciężkich (Pb, Zn, Ni, Cr i Cu) w osadach kanałów ściekowych wzdłuż dróg szybkiego ruchu w mieście Benin w Nigerii. Przy wysokiej koncentracji tych metali we wszystkich badanych obszarach, stężenia Pb i Cu są szczególnie wysokie w osadach z obszarów o dużym natężeniu ruchu drogowego; Zn i Ni nie różnią się pomiędzy obszarami o dużym i średnim natężeniu ruchu, a zawartość Cr w osadach jest taka sama przy wszystkich typach dróg. Wysokie stężenia metali ciężkich w osadach kanałów ściekowych są zagrożeniem dla zasobów wodnych Beninu, szczególnie w sytuacji lokalizacji tego miasta ponad poziomem wodonośnym, który jest przez to potencjalnie narażony na wysoki poziom tych chemicznych zanieczyszczeń
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