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- ItemOpen AccessNitrogen Fixation by Soil Algae of Temperate and Tropical Soils(Plenum Press, 1977) Stewart, W. D. P; Sampaio, M. J.; Isichei, A. O.; Slvester-Bradley, R.Blue-green algae are common components of the microbial flora of the soil in many parts of the world (7, 8, 18, 30). In the tropics most attention has been paid to their role in rice paddy soils where, free-living (26, 27) and in symbiotic association with the water-fern Azolla (3, 19, 21, 36) they contribute substantial amounts of nitrogen to the ecosystem. In this paper we present information on the occurrence, activity, and factors affecting soil algae from tropical savanna regions of Nigeria and from the Amazon region of Brazil. The findings are compared with observations made on algae from temperate soils in Scotland. These studies complement ones from tropical (e. g. 22, 26, 27, 37) and temperate (e.g. 6, 9, 12, 28) regions.
- ItemOpen AccessAcidification Potential in the Nigerian Environment(1988) Isichei, Augustine O.; Akeredolu, FunsoThe inability of developing countries to tackle pollution problems for economic reasons is a fact of life. In addition, due to the lack of knowledge in Nigeria about the environment, it is difficult to ascribe environmental changes to particular factors. Therefore, in viewing acidification caused by sulfur dioxide and oxides of nitrogen in Nigeria, the first problem is to identify the relationship between acidification and prevailing economic activities based on the experience of the developed world.
- ItemOpen AccessVegetation(Nigerian Environmental Study/Action Team, 1991) Isichei, A. O.Natural vegetation provides us with an array of products and services that are vital for our survival and balanced development. Vegetation untouched by human activity probably no longer exists in Nigeria. Farming, logging, grazing, hunting, exploitation for a variety of products, urbanization, and infrastructural development, all heightened by burgeoning human and livestock populations, have reduced our plant cover to a patchwork of farmlands, plantations, and secondary vegetation at various stages of regrowth and maturity.