Subscribe Now Subscribe Today
Research Article

Microbia Population and Diversity as Influenced by Soil pH and Organic Matter in Different Forest Ecosystems

V.A.J. Adekunle , H.B. Dafiewhare and O.F. Ajibode
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Microbial populations were isolated and counted in agar-plated composite soil samples collected from stands of three different species and an adjacent natural forest in Akure forest reserve. The plantations were mature and unthinned stands of Nauclea didderrichi, Gmelina arborea and Tectona grandis. This was to assess the role of microbes in humus formation and soil fertility enhancement and to compare their population and species diversity in the monoculture stands and the natural forest. Soil pH and organic matter contents of the soil samples were also obtained, compared and correlated with microbial population. The results show that the soil samples consisted 33 species of bacteria and 23 species of fungi. The population of bacteria ranged between 26.14 x 106 and 360 x 106 MPN g-1 dried soil while that of fungi ranged between 2.50 x 106 and 23.34 x 106 MPN g-1 dried soil. Highest species diversity and population of the microbes were isolated in soil samples from the natural forest and the least from Tectona grandis stand. The correlation and regression results show that microbial diversity and abundance is highly influenced by soil pH and organic matter. There was no significant difference in organic matter and pH values of the samples from the different forest ecosystem (p = 0.05) but significant difference was discovered to exist in bacterial and fungal population (p = 0.05). The number and species diversity obtained for bacteria were more than that of fungi but there was close association in the abundance of the microbes obtained for all the soil samples.

Related Articles in ASCI
Similar Articles in this Journal
Search in Google Scholar
View Citation
Report Citation

  How to cite this article:

V.A.J. Adekunle , H.B. Dafiewhare and O.F. Ajibode , 2005. Microbia Population and Diversity as Influenced by Soil pH and Organic Matter in Different Forest Ecosystems . Pakistan Journal of Biological Sciences, 8: 1478-1484.

DOI: 10.3923/pjbs.2005.1478.1484


1:  Daily, C., 1997. Nature Sciences Societal Dependence on Natural Ecosystems. Island Press, Washington DC, USA.

2:  Scherr, S., A. White and A. Khare, 2004. For services rendered. International Tropical and Timber Organization (ITTO). Trop. Update, 14: 11-14.

3:  Copely, J., 2000. Ecology goes underground. Nature, 406: 452-454.

4:  Inckel, M., P. Smet and T. Veldkamp, 1990. The Preparation and Use of Compost. Agrodok 8 Agromisa Foundation Technical Center for Agriculture and Rural Corp. Netherlands, pp: 25.

5:  Hoff, J.A., N.B. Klopfenstein, J.R. Ton, G.I. McDonald and L.M. Carris et al., 2004. Roles of woody root associated fungi in forest ecosystem processes recent advances in fungal identification. Res. Paper, RMRS-RP-47, Fort Collins, CO US Dept. Agric., Forest. Serv., pp: 6.

6:  Stamets, P., 2005. Mycelium Running How Mushrooms Can Help Save the World. Ten Speed Press, Berkeley, CA.

7:  Rigobelis, E.C. and E. Nahas, 2004. Seasonal fluctuations of bacterial population and microbial activity in Soils calibrated with Eucalyptus and Pinus. Sci. Agric., 6: 88-93.

8:  Taylor, B.R. and D. Parkinson, 1988. Aspen and Pine leaf litter decomposition in laboratory microcosms. Interactions of temperature and moisture level. Can. J. Bot., 66: 1966-1973.

9:  Persson, T., E. Bath, M. Clarholm, H. Lundkvisit, B. Soderstrm and B. Sohlenins, 1980. Trophic structure biomass dynamics and carbon metabolism of soil organisms in a Scots pine forest. Ecol. Bull., 32: 419-459.

10:  Alexander, M., 1982. Most Probable Number Method for Microbial Populations. In: Methods of Soil Analysis, Page, A.C., R.H. Miller and D.R. Keeney (Eds.). 2nd Edn., Chemical and Microbial Properties, Madison, USA., pp: 815-820.

11:  Walkley, A. and I.A. Black, 1934. An examination of the degtjareff method for determining soil organic matter and a proposed modification of the chromic acid titration method. Soil Sci., 37: 29-38.
CrossRef  |  Direct Link  |  

12:  Steel, R.G.D., J.H. Torrie and D.A. Zoberer, 1997. Principles and Procedures of Statistics a Biometrical Approach. 3rd Edn., McGraw-Hill, Inc., New York, Pages: 666.

13:  Adekunle V.A.J., S.O. Akindele and J.A. Fuwape, 2004. Structure and yield models for tropical lowland rainforest ecosystem of SW Nigeria. Food Agric. Environ., 2: 395-399.

14:  Bigelow, C.A., D.C. Bowman and A.G. Wollum, 2004. Characterization of soil microbial population dynamics in newly constructed sand-based root zones. Crop Sci., 42: 1611-1614.

15:  Wolters, V., W.L. Silver, D.E. Bignell, D.C. Coleman and J.A.V. Veen et al., 2000. Effect of global changes on above and belowground biodiversity in terrestrial ecosystems implications for ecosystem functioning. Bio Sci., 50: 1089-1098.

16:  Ford, P.L., D.U. Potter, B. Pendleton, W.A. Ribbie and G.J. Gottfried, 2004. Southwestern Grassland Ecology. In: Assessment of Grassland Ecosystem Conditions in SW United States, Finch, D.M. (Ed.). Forest Service Genetic Technology Representative RMRS-GTR-135, Southwestern United States, pp: 18-48.

17:  Sundareshwar, P.V., J.T. Morris, E.K. Koepfler and B. Fornwalt, 2003. Phosphorus limitation of coastal ecosystem processes. Science, 299: 563-565.
CrossRef  |  Direct Link  |  

18:  Nwoboshi, L.C., 2000. The Nutrient Factor in Sustainable Forestry. Ibadan University Press, Ibadan, Nigeria, pp: 303.

19:  Young, A., 1990. Agroforestry for Soil Conservation. CAB International, Wallingford, UK., ISBN-13: 9780851986487, Pages: 276.

20:  Evan, J., 1999. Plantation Forestry in the Tropics. 2nd Edn., Oxford University Press, Oxford, New Yark, pp: 403.

21:  Chijioke, E.O., 1980. Impact on Soils of Fast Growing Species in Lowland Humid Tropics. FAO., Rome.

22:  Alexander, M., 1977. Introduction to Soil Microbiology. 2nd Edn., John Wiley and Sons, New York, ISBN: 0471021784.

©  2021 Science Alert. All Rights Reserved