Carbon pools in tree biomass and the soil in improved fallows in eastern Zambia |
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Authors: | Martin L. Kaonga Tim P. Bayliss-Smith |
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Affiliation: | (1) 368 Milton Road, Cambridge, CB4 1SU, UK;(2) Department of Geography, University of Cambridge, Downing Place, Cambridge, CB4 3EN, UK |
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Abstract: | This study quantified tree and soil C stocks and their response to different tree species and clay contents in improved fallows in eastern Zambia. From 2002 to 2003, soil, and destructively harvested two-year old tree, samples were analysed for C. There were significant differences (P < 0.05) in aboveground tree C stocks, and in net organic C (NOC) intake rates across coppicing tree species at Msekera and Kalunga. Aboveground C stocks ranged from 2.9 to 9.8 t ha-1, equivalent to NOC intakes of 0.8–4.9 t ha-1 year-1. SOC stocks in non-coppiced fallows at Kalichero and Msekera significantly differed (P < 0.05) across treatments. SOC stocks to 200 cm depth ranged from 64.7 t C ha-1 under non-coppicing fallows at Kalunga to 184.0 t ha-1 in 10-year-old coppicing fallows at Msekera. Therefore, tree and soil C stocks in improved fallows can be increased by planting selected tree species on soils with high clay content. |
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Keywords: | Carbon pools Improved fallows Net organic carbon intake (NOC) Soil organic carbon (SOC) Trees |
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