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International Journal of Soil Science
  Year: 2006 | Volume: 1 | Issue: 1 | Page No.: 33-43
DOI: 10.3923/ijss.2006.33.43
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Potential of Soil Carbon Sequestration under Various Landuse in the Sub-humid and Semi-arid Savanna of Nigeria: Lessons from Long-term Experiments

B.A. Raji and J.O. Ogunwole

The objective of this research is to use the opportunity of the long-term Cowdung (D), Nitrogen (N), Phosphorus (P) and Potassium (K) trial at Samaru and the improved pasture trial at Shika both in Zaria and the sand dune stabilization trial at Gidan Kaura near Illela in NW Nigeria to provide reliable estimates of the long-term soil C turnover in the semi-arid and sub-humid savannas of Nigeria and by extension, West Africa. After 45 years of the DNPK treatments, Soil Organic Carbon (SOC) content in the unamended soil (control) was still on a slight increase, as represented by an increase of 1.81 t C ha-1 or 10 g C m-2 yr-1 between 1977 and 1995. In the same period of 45 years, the use of continuous NPK application resulted in only slight increase in SOC (3%) over the unamended soil while manure with NPK gave 115% more SOC. The use of NPK between 1977 and 1995, a period of 18 years, improved SOC content from 4.95 to 7.30 t C ha-1, giving a rate of 13 g C m-2 yr-1. This rate is about 50% less the rate using manure alone and 75% less using manure with NPK. After 6 years of natural fallow, the unamended soils experienced a slight decrease in SOC content from 7.04 to 6.83 t C ha-1 representing about 3% reduction. Generally, the rate of SOC sequestration during the fallow period is approximately 400% more than the rates under continuous cultivation. The rate of carbon sequestration for plots receiving manure during cultivation is 24 g C m-2 yr-1 and this increased to 108 g C m-2 yr-1 during the fallow period. Improved pasture like Brachiaria decumbens has the potential to sequester about 20 t C ha-1 in 3 5 years or a rate of 825 g C m-2 yr-1 over the control. Despite the near natural conditions of the sand dune stabilization trial, SOC under shelter belt sequestered up to 39.09 t C ha-1 in 12 years of the trial. This value is about 16 times the SOC in the unstabilized sand dune (control). The rate of SOC accumulation in the shelter belt is about 305 g C m-2 yr-1 more than the control. The potential for SOC sequestration by the use of eucalyptus and neem trees In afforestation in NW Nigeria is between 23 and 305 g C m-2 yr-1 over the control. Under continuous cultivation, the potential for SOC sequestration is greatest when NPK is co-applied with manure giving a rate of 36 to 158 g C m-2 yr-1.
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How to cite this article:

B.A. Raji and J.O. Ogunwole , 2006. Potential of Soil Carbon Sequestration under Various Landuse in the Sub-humid and Semi-arid Savanna of Nigeria: Lessons from Long-term Experiments. International Journal of Soil Science, 1: 33-43.

DOI: 10.3923/ijss.2006.33.43






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