Biomass Production in the rangelands of Gambella, southwestern Ethiopia

Ketema Tilahun Gelaye

Abstract


The study was conducted in the rangelands of Gambella, southwestern Ethiopia with the objectives of investigating biomass production of the grassland. For the vegetation survey the rangeland was stratified by districts namely: Itang and Jikawo and each district further divided into major grazing types (less, seasonal, communal grazed and river basins). Data were collected on grass species composition and estimation of the biomass was made on the dry matter basis. Biomass of standing grass and total biomass in the districts were significantly (p<0.05) affected by grazing. Accordingly, with the highest in less grazed areas (2,044 and 2,216 kg/ha) followed by moderately grazed areas (1,006 and 1,137 kg/ha) the least in river basins (467 and 563 kg/ha). In Jikawo district, total biomass of less grazed, moderately grazed and heavily grazed communal lands and river banks were 1678; 1032;652 and 457 kg/ha, respectively. The standing grasses biomass of these major grazing areas was with the order of 1513; 897; 573 and 369 kg/ha, respectively. The annual DMY of the herbaceous vegetation layer in the study districts under the grazing land use category may be estimated as 243,950.0 t DM/annum for Itang and 173,470.0 t DM/annum for that of Jikawo. According to the estimated biomass production of the grazing lands, the carrying capacity of the rangeland in Itang and Jikawo would be 0.16 and 0.13 TLU/ha, respectively. However, rangelands in Jikawo district support large number of livestock beyond their maximum capacity (0.85 TLU/ha) compared to the estimated CC. On the other hand, in Itang there was underutilization of the grassland due to lower livestock population depended on the available grassland feed resources (i.e., 0.05 TLU/ha). An attempt to employ appropriate management systems along with monitoring of the rangeland condition might be needed to promote the productivity of the study areas to the level of the carrying capacity to ensure its sustainable utilization.


Keywords


annum, carrying capacity, dry matter yield, Gambella, grazing areas, tropical livestock unit

References


Abule, E. (2003). Rangeland evaluation in relation to pastoralist’s perceptions in the Mid-Awash rift valley of Ethiopia. Ph.D. Dissertation. The Free State Univer., Bloemfontein, South Africa.

Ahmed, B. (2003). Soil condition and vegetation cover in human impacted rangelands of Jijiga, Somali Regional State. MSc Thesis. Alemaya Univer., Ethiopia.

Alemayehu, M. (2004). Rangeland Biodiversity: Concepts, Approaches and the way forward. Addis Ababa University, Faculty of Science, Addis Ababa, Ethiopia.80p.

Amaha, K. (2006). Characterzation of rangeland resources and dynamices of the pastoral Production system in the Somali region of Estern Ethiopia. Ph.D. Thesis. The Free State Univer., Bloemfontein, South Africa.

Amsalu, S. (2000). Herbaceous species composition, dry matter production and condition of the major grazing areas in the mid rift valley. M.Sc. Thesis. Alemaya Univer., Ethiopia.

Ayana, A. (1999). Range condition and traditional grazing management in Borana. M.Sc. Thesis. Alemaya Univer., Ethiopia.

Belaynesh, D. (2006). Floristic composition and diversity of the vegetation, soil seed bank flora and condition of the rangelands of the Jijiga Zone, Somali Regional State, Ethiopia. M.Sc. Thesis. Alemaya Univer., Ethiopia.

Beruk, Y. (2003). The declining pastoral environment and variability status and adaptation strategies. Pp. 155-164. Proceedings of the Challenges and Opportunities of Livestock Marketing. The 10th annual conference of Ethiopia Society of Animal Production, Addis Ababa, Ethiopia, 22-24 August 2003.

BLPDP (Borana Lowland Pastoral Development Programme). (2004). Overview of Borana Pastoral Production Livelihood System. Extension-, PRA- and M+E- Concepts Networking and Policy Advocacy. BLPDP, Documentation on 7 years experience, Vol. I. December, 2004. Addis Ababa, Ethiopia.

Coppock, .D.L. (1993).Vegetation and pastoral dynamics in the southern Ethiopia rangelands: Implications for theory and management. Pp.42-61. In: Behnke, R.H.J., I. Scoones and C. Kerven (eds.). Range ecology at disequilibrium. New model of natural variability and pastoral adaptation in African Savanna. Overseas Development Institute, London, UK.

Coppock, D.L. (1994). The Borana Plateau of Southern Ethiopia: Synthesis of pastoral research, development and change, 1980-1991. International Livestock Center for Africa (ILCA), Addis Ababa, Ethiopia.393p.

Dyksterhuis, E.J. (1949). Condition and management of rangeland based on quantitative ecology. J. Range Manage., 2:104-115.

EARO (Ethiopia Agricultural Research Organization). (2000). Dry land Agriculture Research Strategic Planning Document. Addis Ababa, Ethiopia. 66p.

Gemedo, D. T. (2004). Vegetation ecology, rangeland condition and forage resources evaluation in the Borana lowlands, Southern Ethiopia. Ph.D. Dissertation. Georg-Audust-Univer., Gottingerg, Germany.

GRS (Gambella Regional State). (2003). Gambella Regional Land-use and Land Allotment Study. Amended Draft Final Report, Vol. II. Yeshi-Ber Consult (YBC). October 2003, Addis Ababa, Ethiopia.

IAR (Institute of Agricultural Research). (1990). Abobo Research Center Progress Report 1988-1989. IAR. Addis Ababa, Ethiopia.

ILCA (International Livestock Center for Africa). (1990). Livestock Research Manual. ILCA, Addis Ababa, Ethiopia. 2:31-54.

Oba, G. (2001). Indigenous ecological knowledge of landscape change in East Africa. International Association for Landscape Ecology Bulletin. Vol. 19(3): 1-3.

PADS (Pastoral Areas Development Study). (2004). Review of the past and present trends of the pastoral areas. Pp.1-34. Livestock Resources. PADS Report Phase I. Section I, Vol.II, Techniplan, MCE, Agristudio, Addis Ababa and Rome.

PFE (Pastoralist Forum Ethiopia). (2001). Poverty Reduction Strategy and Pastoral Development. Proceedings of the Second National Conference on Pastoral Development in Ethiopia. 22-23 May 2001, Addis Ababa, Ethiopia, Pastoralists Forum Ethiopia.

PFE (Pastoralist Forum Ethiopia). (2004). Pastoralism and sustainable pastoral development. Proceedings of the Third National Conference on Pastoral Development in Ethiopia. 23-24 December 2003, Addis Ababa, Ethiopia, Pastoralists Forum Ethiopia.

Pluhar, J.J., Knight, R.W. and Heitschmidt, R.K. (1987). Infiltration rates and sediment production as influenced by grazing systems in the Texas Rolling Plains. J. Range Manage., 40:240-243.

Russell, A. (1984). The environment of Ethiopia Rift Valley compared to other areas of Africa. In: Richard Stewart, (ed.). ILCA Bulletin No. 17. ILCA. Addis Ababa, Ethiopia.

SAS (Statistical Analysis System). (1999). Institute of Applied Statistics and SAS Programming Language. Cary, North Carolina.

Stoddart, L.A., Smith, A.D. and Box, T.W. (1975). Range management. Third edition. McGraw-Hill, New York. 532p.

Walter, D.W., Smoliak, S. and Dormaar, J. F. (1990). Vegetation response to time-controlled grazing on Mixed and Fescue Prairie. J. Range Manage., 43(6):513-517.


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