Monitoring the Spatio-Temporal Dynamics of Vegetation Cover in Mubi Region, Adamawa State, Nigeria

Bulus Luka Gadiga

Department of Geography, Adamawa State University, Mubi, Nigeria.

DOI: 10.4236/jgis.2015.76048                

Abstract

Studies around the world have shown that vegetation cover is undergoing a dramatic change at various scales. Vegetation is a very important component of the ecosystem, its destruction by whatever means will have an adverse effect on the functional role it plays in the environment. Hence, it is necessary to monitor, conserve and utilize these vital resources sustainably. This study monitors vegetation dynamics in Mubi region with the view to understand the status of vegetation cover and suggest possible conservation measures. The study used regression differencing method of change detection to identify the status and dynamics of vegetation cover in the region. Landsat satellite images were used to create Normalized Difference Vegetation Index (NDVI) using IDRISI software. The NDVI images were subjected to diverse analysis ranging from image registration to image regression, differencing and thresholding. The results from these analysis shows that vegetation cover in the region has witnessed unprecedented degradation. In the period between 1987 and 1999 (12 years) the area that experienced depletion in vegetation cover in the region was 10,501.42 hectares while the period between 1999 and 2015 (16 years) witnessed further depletion to 32,701.77 hectares. The areas that experienced restoration in vegetation cover in the region from the period between 1999 and 2015 (24,098.94 hectares) have lower areal extent compared with the period between 1987 and 1999 (44,045.80 hectares). This phenomenon is not unconnected with population growth as the region has witnessed explosive growth in the recent past. This growth in population has resulted in higher demand for food to feed the growing population thereby leading to expansion of farmland. High demands for fuelwood by the increasing populace have also contributed to increase in deforestation. Removal of vegetation cover at such a scale will eventually have negative consequences on the ecosystem as its functional roles in the environment are jeopardized. Hence, there is a need to preserve and conserve vegetal resources through sustainable use.

Keywords

Vegetation Cover, Degradation, Vegetation Restoration, NDVI, Regression Differencing

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Birgit, R., Annette, O. and Rainer, W. (2007) Identifying of Land-Cover Change and Their Attributes in a Marginal European Landscape. Landscape and Urban Planning, 81, 104-133. http://dx.doi.org/10.1016/j.landurbplan.2006.10.018
[2]	Barraclough, S.L. and Ghimire, K.B. (1996) Deforestation in Tanzania: Beyond Simplistic Generalizations. The Ecologist, 26, 104-107.
[3]	Hatchinson, C.F., Unru, J.D. and Bahre, C.J. (2000) Land Use vs. Climate as Causes of Vegetation Change: A Study in SE Arizona. Global Environmental Change, 10, 47-55. http://dx.doi.org/10.1016/S0959-3780(00)00009-1
[4]	Bahre, C.J. and Shelton, M.L. (1993) Historic Vegetation Change, Mesquite Increases, and Climate in Southeastern Arizona. Journal of Biogeography, 20, 489-501. http://dx.doi.org/10.2307/2845722
[5]	Turner, B.L., Skole, D., Sanderson, S., Fischer, G., Fresco, L.O. and Leemans, R. (1995) Land Use and Land Cover Change. Science/Research Plan, IGBP Report No. 35, Stockholm 6, Geneve.
[6]	Tucker, C.J., Dregne, H.E. and Newcomb, W.W. (1991) Expansion and Contraction of the Sahara Desert from 1980 to 1990. Science, 253, 229-301. http://dx.doi.org/10.1126/science.253.5017.299
[7]	Hare, F.K. (1985) Climate Variations, Drought and Desertification. WMO, Geneva.
[8]	Snrech, S. (1994) Population, environnement et economie au Sahel. In: Reenberg, A. and Markussen, B., Eds., The Sahel: Population; Integrated Rural Development Projects; Research Components in Development Projects, Proceedings from the Danish Sahel Workshop, 6-8 January 1994. AAU Reports 32. Aarhus University, Denmark.
[9]	Webber, P. (1996) Agrarian Changes in Kusasi, North-East Ghana. Africa, 66, 437-457. http://dx.doi.org/10.2307/1160961
[10]	Vierich, H.I.D. and Stoop, W.A. (1990) Changes in West African Savanna Agriculture in Response to Growing Population and Continuing Low Rainfall. Agriculture, Ecosystems and Environment, 31, 115-132. http://dx.doi.org/10.1016/0167-8809(90)90214-X
[11]	Greenland, D.J., Bowen, G., Eswaran, H., Rhoades, R. and Valentin, C. (1994) Soil, Water, and Nutrient Management Research—A New Agenda. IBSRAM Position Paper, Bangkok.
[12]	Sala, O.E., Chapin, F.S., Armesto, J.J., Berlow, E., Bloomfield, J., Dirzo, R., Huber-Sanwald, E., Huenneke, L.F., Jackson, R.B., Kinzig, A., Leemans, R., Lodge, D.M., Mooney, H.A., Oesterheld, M., Poff, N.L., Sykes, M.T., Walker, B.H., Walker, M. and Wall, D.H. (2000) Biodiversity: Global Biodiversity Scenarios for the Year 2100. Science, 287, 1770-1774. http://dx.doi.org/10.1126/science.287.5459.1770
[13]	Reid, R.S., Kruska, R.L., Muthui, N., Taye, A., Wotton, S., Wilson, C.J. and Mulatu, W. (2000) Land-Use and Land-Cover Dynamics in Response to Changes in Climatic, Biological and Socio-Political Forces: The Case of Southwestern Ethiopia. Landscape Ecology, 15, 339-355. http://dx.doi.org/10.1023/A:1008177712995
[14]	Alphan, H. (2003) Land Use Change and Urbanization in Adana, Turkey. Land Degradation and Development, 14, 575-586. http://dx.doi.org/10.1002/ldr.581
[15]	Muttitanon, W. and Tripathi, N.K. (2005) Land Use/Cover Changes in the Coastal Zone of Bay Don Bay, Thailand Using Landsat 5 TM Data. International Journal of Remote Sensing, 26, 2311-2323. http://dx.doi.org/10.1080/0143116051233132666
[16]	Evrendilek, F. (2004) An Inventory-Based Carbon Budget for Forest and Woodland Ecosystems of Turkey. Journal of Environmental Monitoring, 6, 26-30. http://dx.doi.org/10.1039/b309893a
[17]	Houghton, R.A. (2003) Revised Estimates of the Annual Net Flux of Carbon to the Atmosphere from Changes in Land Use and Land Management 1850-2000. Tellus B, 55, 378-390. http://dx.doi.org/10.1034/j.1600-0889.2003.01450.x
[18]	Musa, A.A. and Adebayo, A.A. (2004) Environmental Degradation. In: Adebayo, A.A., Ed., Mubi Region: A Geo-graphical Synthesis, Paraclete Publishers, Yola, 49-55.
[19]	Saidu, I. and Gadiga, B.L. (2004) Population. In: Adebayo, A.A., Ed., Mubi Region: A Geographical Synthesis, Paraclete Publishers, Yola, 117-119.
[20]	Adebayo, A.A., Ed. (2004) Mubi Region: A Geographical Synthesis. Paraclete Publishers, Yola.
[21]	Lu, D., Mausel, P., Brondízio, E. and Moran, E. (2004) Change Detection Techniques. International Journal of Remote Sensing, 25, 2365-2401. http://dx.doi.org/10.1080/0143116031000139863
[22]	Pu, R., Gong, P., Tian, Y., Miao, X., Carruthers, R.I. and Anderson, G.L. (2008) Using Classification and NDVI Differencing Methods for Monitoring Sparse Vegetation Coverage: A Case Study of Saltcedar in Nevada, USA. International Journal of Remote Sensing, 29, 3987-4011. http://dx.doi.org/10.1080/01431160801908095
[23]	Eastman, J.R. (2009) IDRISI Taiga Guide to GIS and Image Processing. Clark Labs, Clark University, Worcester.
[24]	Orimooguje, O.O. and Gadiga, B.L. (2011) Remote Sensing for Mapping Riparian Vegetation Change in the Upper Yedzeram Basin. In: Salami, A.T. and Orimoogunje, O.O.I., Eds., Environmental Research and Challenges of Sustainable Development in Nigeria, Obafemi Awolowo University Press, Ile-Ife.
[25]	Peter, Y., Gadiga, B.L. and David, N.F. (2015) Analysis of the Spatio-Temporal Dynamics of Mubi Area, Adamawa State, Nigeria. Adamawa State University Journal of Scientific Research, 3, 9-19.