1.1 BACKGROUND INFORMATION
Land is the basic natural resource that provides habitat and sustenance for living organisms, as well as being a major focus of economic activities. (UNEP 2006). Africa is endowed with enough land to undertake small and large-scale activities to strengthen household security, national development, transboundary cooperation and regional integration to transform trade, and create new opportunities for sustainable development which is sensitive to the environment and social economic issues (Bangladesh, 2001). There are however, many threats and challenges which continue to undermine such progress limiting its potential. These include pandemics such as HIV/AIDS, climate variability and change, extreme weather events such as drought and floods, ineffective land-use planning, land degradation and desertification, invasive alien species, limited or weak governance systems, corruption and greed, armed conflict and the attendant overexploitation of natural resources, limited foreign direct investment, Limited domestic investment and wasted opportunities, loss of revenue due to leakage in sectors such as tourism are also important factors (Mryka, 2008).
Degradation of land refers to loss of its potential production capability as a result of degradation of soil quality and also its loss for effective use.
According to Global Environment Facility (GEF 2003), Land degradation is defined as any form of deterioration of the natural potential of land that affects ecosystem integrity either in terms of reducing its sustainable ecological productivity or in terms of its active biological richness and maintenance of resilience. It is the loss of utility of land or the decline in soil quality caused through misuse by human (Barrow, 1992).
Furthermore, UNCCD defines land degradation as a reduction or loss in arid semi-arid and dry sub-humid areas of the biological or economic productivity and complexity of rain-fed cropland, irrigated cropland, range land pasture, forest, and woodlands resulting from land uses or from a process or combination of processes, including processes arising from human activities and habitation patterns such as:
Land degradation is one of the worst environmental problems facing many people worldwide. According to UNCCD (2009), over 250 million people are directly affected by land degradation. It is a worldwide phenomenon substantially affecting productivity in over 80 countries or all continents, except Antarctica. Land degradation is especially serious in Africa where 36 countries face dryland degradation or desertification, land degradation adversely affects the ecological integrity and productivity of about 2 billon hectares or 23% of landscapes under human use. Agricultural lands in both dryland and forest areas have been most severely affected by land degradation. They cover about one-fourth of the world’s total land area and account for 95% of all animal and plant protein and 99% of calories consumed by human, about two-thirds of agricultural land has been degraded to some extent during the last 50 years (GEF, 2003).
In addition, one billion people in over 100 countries are at risk, these people include many of the world's poorest most marginalized and politically weak citizens and over 40 million are affected in Nigeria.
The intensification of the use of fragile and marginal ecosystems has led to progressive degradation and continued desertification of marginal agricultural lands. Even in areas of normal rainfall, it is feared that the damage by drought and population pressure may have resulted in the genetic loss of a vast array of valuable plant species. Pressure on the dwindling resources in the arid prone areas has resulted in a number of devastating socio-political and sectarian conflicts in the country with concomitant death, injury and heavy economic losses.
In Bangladesh, the topsoil degrades due to natural processes and human activities, the functional capabilities of soil deteriorate from activities related to agriculture, forestry, and industry. On the other hand, urban sprawling and infrastructure development cause loss of available agricultural land. Natural events such as cyclones and floods cause land loss and can also deteriorate functional capabilities of soil.
Land degradation in the coastal area results from unplanned land use as well as intrusion of saline water. Therefore, solving or minimizing land degradation problems should be based on multi-sectored multi-layered, yet integrated approaches.
Some of the causes of land degradation as noted by Ukpong (1994) include: Improper resource management, destructive logging of our forest, overgrazing and over-cropping of arable lands, flooding and wind erosion menace, strip mining in some parts of Nigeria, land degradation with pesticides and fertilizers, some known natural land slides, destruction of wetlands and marches for development. He also identified other indirect causes of land degradation to include population growth and population influx, property ownership issues, lack of control, enforcement measures and jurisdictional overlap which are due to lack of authority and the use of inappropriate technology for farming and even for producing manufactured goods.
Land degradation typically occurs because of land management practices or human development that is not sustainable over a period of time.
1.2 Problem statement
Land degradation, as a decline in land quality caused by human activities has been a major global issue during the 20th century and will remain on the international agenda in the 21st century. The importance of land degradation among global issues is placed on because of its impact on world food security and quality of the environment.
According to Akamigbo (2005), land degradation assume varying various dimensions depending on one’s location in the country. For example, inhabitants of the coastal areas are not as worried by the fear of desert encroachment as those who reside in Borno, Sokoto, Katsina, and Kano states of Nigeria, just as they worry about oil pollution and spillage, accompanied with coastal erosion and flooding. Sheet erosion is nation-wide while gully erosion is most severe and dense in certain southern states of Anambra, Imo, Abia, Enugu, Ondo, Delta and Akwa Ibom. Other states outside the southern zone such as Kogi, Jigawa, Adamawa and Gombe. Flooding occurs throughout Nigeria. Land degradation in the extreme form of gully erosion, can cause the loss of human life and other economic resources, roads and houses are destroyed.
Land degradation in an agrarian economy can lead to unsustainable agriculture and development, thereby precipitating starvation and poverty. It can cause siltation of reservoirs, lakes, stream and rivers. Such phenomenon will lead to scarcity of water for both humans and livestock. The water may be polluted and thereby cause various types of health problems.
As population continues to grow and towns and villages continue to develop, demand for more land for economic activities such as oil exploration, road, building construction and industrialization become high. These activities lead to land degradation through oil spillage, erosion and pollution which led to shortage of agricultural land (Orji, Ugwumba and Ugo, 2006). Land degradation may also caused by soil erosion, deforestation, overgrazing, shortened circles of shifting cultivation and cultivation on sloped areas without any form of conservation (Okon and Amalu, 2003; Robert, 1991; Mortis, 1990).
According to Federal Ministry of Agriculture and Rural Development (2003), Nigeria has lost about 285,000sqm of her land to various form of land degradation. Again, during oil exploration, oil spillage gas flaring and other seismic operations, toxic substances are introduced into the surrounding environment consequently, the air, rivers and land becomes damaged and polluted.
These therefore raised some pertinent questions. What are the perceived effects of these activities on agricultural activities? What are the various ways of improving these degraded lands?
1.3 Objective of the study
The overall objective of the study was to ascertain the perceived effects of land degradation in the study area.
The specific objectives are to:
1.4 Significance of the study
This study will be useful to the community for adopting more seriously soil conservation measures and to the government. It will be an aid towards the formulation of concrete policies for the amelioration of land degradation in the area.
This work will help to explore, analyze and make policy and recommendations for possible adoption by the authorities concern. The findings of this research will also strengthen agricultural production in the area, enrich literature on the area and open up new areas for research.
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