OJE  Vol.5 No.6 , June 2015
The Impact of Grazing on Plant Natural Regeneration in Northern Slopes of Mount Kilimanjaro, Tanzania
Abstract: Livestock grazing is considered to be of great ecological importance in terrestrial ecosystems if sustained at acceptable levels. Overgrazing has ecological ramifications which lead to degradation of the ecosystem. This has become a problem in many parts of Tanzania. A study was conducted in Northen Slopes of Mount Kilimajaro in order to examine the impact of grazing on natural regeneration of the grazed vegetation. This paper is guided by the hypothesis that the species richness, species diversity and density of regenerants vary across grazing intensities. The study area was divided into four zones as per grazing intensity namely heavily grazed areas, moderately grazed, least grazed and ungrazed areas. Ten rectangular quadrats of 20 m × 25 m were established in each zone, making a total of 40 quadrats in the entire study area. A stratified random sampling procedure was used in locating quadrats in each zone of grazing intensity whereby two subquadrats of 2 m × 5 m were nested in bigger quadrats. Natural regeneration was assessed in terms of species diversity and density of seedlings, saplings and poles. Results indicate that species regeneration varied among areas with different grazing intensity. The variations of seedlings and saplings density among areas with different grazing intensity were statistically significant. The species diversity of regenerants differed significantly among areas with different grazing intensity. Keeping the grazing intensity at low and moderate levels will stimulate more plant growth and diversity as opposed to heavy grazing which will lead to vegetation retrogression.
Cite this paper: Kikoti, I. , Mligo, C. and Kilemo, D. (2015) The Impact of Grazing on Plant Natural Regeneration in Northern Slopes of Mount Kilimanjaro, Tanzania. Open Journal of Ecology, 5, 266-273. doi: 10.4236/oje.2015.56021.

[1]   Lambretchs, C., Woodley, B., Hemp, A., Hemp, C. and Nnyiti, P. (2002) Aerial Survey of the Threats to Mount Kilimanjaro Forests. UNDP, Dar es Salaam, 33 p.

[2]   Tanzania National Parks (2006) General Management Plan for Kilimanjaro National Park (2006-2015). Tanzania National Parks, Arusha.

[3]   Hemp, A. (2005) Climate Change Driven Forest Fires Marginalizes the Ice Cap Wasting on Mount Kilimanjaro. Global Change Biology, 11, 1013-1023.

[4]   Hemp, A. (2005) The Impact of Fire on Diversity, Structure and Composition of Mount Kilimanjaro Vegetation. In: Spehn, E., Liberman, M. and Korner, C., Eds., Land Use Change and Mountain Biodiversity, CRC Press LLC, Boca Raton, 51-68.

[5]   Thomson, L.G., Mosley-Thomson, E., Davis, M.E., Henderson, K.A., Brecher, H.H., Zagorodnov, V.S., Mashiotta, T.A., Lin, P.N., Mikhalenko, V.N., Hardy, D.R. and Beer, J. (2002) Kilimanjaro Ice Core Records: Evidence of Holocene Climate Change in Tropical Africa. Science, 298, 589-593.

[6]   Stohlgren, T.J., Falkner, M.B. and Schell, L.D. (1995) A Modified-Whittaker Nested Vegetation Sampling Method. Vegetatio, 117, 113-121.

[7]   Mligo, C., Lyaruu, H.V.M. and Ndangalasi, H.J. (2011) The Effect of Anthropogenic Disturbances on Population Structure and Regeneration of Scorodophloeus fischeri and Manilkara sulcata in Coastal Forests of Tanzania. Southern Forests, 73, 33-40.

[8]   Rulangalanga, Z.K. (2000) Obstacles to the Sustainable Utilization of the Vegetation of Semi-Arid Areas of Mbulu District for Animal Husbandry. Workshop on Current Initiative in Sustainable Management of Dryland Biodiversity, Arusha. (Unpublished)

[9]   Shannon, C. (1948) A Mathematical Theory of Communication. Bell System Technical Journal, 27, 379-423.

[10]   Wassie, A., Sterck, F.J., Teketay, D. and Bongers, F. (2009) Effects of Livestock Exclusion on Tree Regeneration in Church Forests of Ethiopia. Forest Ecology and Management, 257, 765-772.

[11]   Smit, C., Gusberti, M. and Müller-Scharer, H. (2006) Safe for Saplings; Safe for Seeds? Forest Ecology and Management, 237, 471-477.

[12]   Stern, M., Quesada, M. and Stoner, K.E. (2002) Changes in Composition and Structure of a Tropical Dry Forest Following Intermittent Cattle Grazing. International Journal of Tropical Biology, 50, 1021-1034.

[13]   Jimenez, J., Jurado, E., Aguirre, O. and Estrada, E. (2005) Effect of Grazing on Restoration of Endemic Dwarf Pine (Pinus culminicola Andresen et Beaman) Populations in Northeastern Mexico. Restoration Ecology, 13, 103-107.

[14]   Teich, I., Cingolani, A.M., Renison, D., Hensen, I. and Giorgis, M.A. (2005) Do Domestic Herbivores Retard Polylepis australis Bitt. Woodland Recovery in the Mountains of Cordoba Argentina? Forest Ecology and Management, 219, 229-241.

[15]   McEvoy, P.M., McAdam, J.H., Mosquera-Losada, M.R. and Rigueiro-Rodri-Guez, A. (2006) Tree Regeneration and Sapling Damage of Pedunculate Oak Quercus robur in a Grazed Forest in Galicia, NW Spain: A Comparison of Continuous and Rotational Grazing Systems. Agroforestry System, 66, 85-92.

[16]   Sapkota, I.P., Tigabu, M. and Odén, P.C. (2009) Species Diversity and Regeneration of Old-Growth Seasonally Dry Shorea robusta Forests Following Gap Formation. Journal of Forestry Research, 20, 7-14.

[17]   Zang, R.G. and Wang, B.S. (2002) Study on Canopy Disturbance Regime and Mechanism of Tree Species Diversity Maintenance in the Lower Subtropical Evergreen Broad-Leaved Forest, South China. Plant Biosystems, 136, 241-250.

[18]   Fornara, D.A. and DuToit, J.T. (2008) Browsing-Induced Effects on Leaf Litter Quality and Decomposition in a Southern African Savanna. Ecosystems, 11, 238-249.

[19]   Smith, T.M. and Goodman, P.S. (1987) Successional Dynamics in an Acacia Nilotica-Euclea Divinorum Savannah in Southern Africa. Journal of Ecology, 75, 603-610.

[20]   Sharam, G., Sinclair, A.R.E. and Turkington, R. (2006) Establishment of Broad-Leaved Thickets in Serengeti, Tanzania: The Influence of Fire, Browsers, Grass Competition, and Elephants. Biotropica, 38, 599-605.