International Journal of Agricultural Policy and Research
Vol.2 (4), pp. 167-177, April 2014
Article ID JPR046/14/11 pages
Copyright © 2014 Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 3.0 International License
Original Research Paper
Soil organic carbon stocks in the dominant soils of the Miombo woodland ecosystem of Kitonga Forest Reserve, Iringa, Tanzania
Accepted 26 March, 2014
*1Shelukindo, H. B., 1Semu, E., 1Msanya, B. M., 2Singh, B. R and 3Munishi, P. K. T.
1Department of Soil Science, Faculty of Agriculture, Sokoine University of Agriculture, P.O. Box 3008, Morogoro, Tanzania.
2Department of Environmental Sciences, Norwegian University of Life Sciences, P.O. Box 1432, Ås – Norway.
3Department of Forest Biology, Faculty of Forestry and Nature Conservation, Sokoine University of Agriculture, P.O. Box 3010, Morogoro, Tanzania.
*Corresponding Author’s E-mail: hbashelu(at)yahoo.com
Few studies have determined the soil organic carbon (SOC) stocks in the Miombo woodlands ecosystem in Tanzania. Standard field and laboratory procedures were used to evaluate SOC storage in the Miombo woodlands ecosystem of Kitonga Forest Reserve Iringa, Tanzania. A study area of 52 km2 was selected and ten soil profiles were studied. Representative sampling points were geo-referenced and soil samples collected from natural horizons to the depth of 60 cm. Results show that the total soil organic carbon stocks in soil profiles varied from 19.4 to 28.9 Mg C ha-1 in leptosols; from 45.6 to 80.1 Mg C ha-1 in fluvisols; and from 33.9 to 134.6 Mg C ha-1 in cambisols. The SOC increased significantly (p< 0.05) with increasing elevation, horizon thickness and % clay, but it decreased significantly (p< 0.05) with increasing slope gradient and increasing % sand. The areal distribution of the soil types was 61%, for cambisols, 19% for leptosols, 11% for fluvisols and 9% for natural forest which was not surveyed because of inaccessibility. Proper management of Miombo woodlands would increase the SOC storage and contribute to climate change regulation.
Key words: Miombo woodlands, soil types, soil organic carbon stocks, climate change regulation, Kitonga Forest Reserve, Tanzania