Introduction
1.1 Background Information
The contribution of forest to the sustainability of livelihood and environmental quality cannot be overemphasized. Forest resources, namely woodland, shrubland, bush fallow and farm bush and trees on farms, as well as ecosystem dominated by trees (Arnold, 1998), provide households with income, ensure food security, reduce their vulnerability to shocks and adversities and promote their wellbeing. Indeed, forest environment and the diversity of life, which they harbour, represent an irreplaceable asset to the biosphere and mankind. Ecologically, their function is unquestionable as they provide two-thirds of the net primary productivity of all terrestrial ecosystems, of which our priceless tropical forest account for about sixty percent (Adegboye, 1992). The rich flora and fauna found in the forest meet the subsistence need of the numerous communities especially those living in the vicinity of the forest (Kailsha, 1993).
Globally, forest resources have been a source of subsistence to millions of people throughout the evolutionary history of our species. Different parts of the forest plants, such as leaf, flower, fruit, seed, twig, pod, stem, root, tuber, bark and exudates and whole plant are used for various purposes. Forests not only provide food, fibre and fuelwood but also supply household articles, construction materials and ornamentals to mankind (Adegboye, 1992, Adger and Brown, 1994; Louis, 1993; Kailsha, 1993; Odoemena, 2006). Forest hard wood has been a source of hard currencies, fuel wood and security for the poor. In fact, research on non-farm rural employment and income shows that small scale production and trading activities in forest products constitute one of the largest parts of rural non-farm enterprise employment (Liedholm and Mead, 1993). It is in acknowledgement of the importance of forest resources for livelihood and environmental stability that its conservation and hence sustainable management has been included in the millennium development goals of the United Nations. In Nigeria, poverty has led to the dependence of over 90% of the rural population on forest for livelihood and economic survival (United Nations, 2002; Chukwuone, 2008).
Again, forests play a profound role in the maintenance of soil fertility. Forest leaves and branches of trees cover the top soil, thereby intercepting heavy down pours of rainfall and high velocity moving wind which would have eroded the soil, thereby rendering it less fertile and unproductive. Similarly, dead and decaying portions of forest trees improve the soil texture and structure thus increasing the water infiltration capacity of the soil and thereby enhancing nutrient recycling.
However, for man to continue to derive these benefits, forests and their abundant resources must be well protected against over exploitation. Unfortunately, this is not so. The over − exploitation of forest resources by both genders represents one of the greatest forces in global environmental degradation (Cock and Kock, 1991; GEO, 2000). Although the net loss of forest is slowing down, deforestation and forest degradation remains an on-going phenomenon, especially in tropical regions.
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