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Abstract
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Article Information:
Pedogenesis and Classification of Soils Under Teak (Tectona grandis Linn. f ) Plantation of Various Ages in the Southern Guinea Savanna of Nigeria
A.M. Samndi and J.M. Jibrin
Corresponding Author: A.M. Samndi
Submitted: 2011 July, 02
Accepted: 2011 September, 18
Published: 2012 January, 25 |
Abstract:
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Plantation trees play a major role in soil formation and development, thus this stimulated the need
to determine the effects of Tectona grandis in pedogenic processes and to classify the basaltic soils of the Jos
Plateau underneath trees of various ages. The study showed that the main pedogenic processes were
braunification, mineralization and lessivation. Floral pedoturbation encouraged illuviation, thus resulting into
the formation of clay films on ped surfaces and Bt horizons. The soils were reddish brown to dark reddish
brown with hues between 2.5 to 5YR and chroma less than 4. The texture varied from gravelly clay loam to
gravelly clay, the structure ranged from weak fine to moderate subangular blocky and non sticky to sticky
consistence with aging plantations. The soil pH slightly varied between 5.6 and 6.3 with plantation age and soil
depth. Organic C content did not reveal a definite trend with plantation age, though values were lower in
subsurface horizons and decreased with depth. Available P and Total Exchangeable Bases (TEB) linearly
decreased with aging plantations. The lowest TEB value (8.52 cmol(+)/kg) was obtained under the oldest tree
stands. The exchange acidity (Al and H) value was highest (2.40 cmol(+)/kg) in the underlying horizons under
the oldest plantation, thus indicative of the deteriorative effects of trees on the soil properties. The soils were
classified using the USDA soil taxonomy as Humic Dystrustept (11year old), Oxic Dystrustept (21year old),
Kanhaplic Haplustult (31 year old) and Typic Haplustult (36 year old). Using the FAO/UNESCO the soils were
classified as Humic Cambisols (11 and 21 years old), Humic Acrisols (31year old) and Chromic Luvisols (36
year old). Applying the WRB, the soils were classified as Chromic Umbrisols (11 and 21 years old),
Umbrihumic Acrisols (31 year old) and Chromic Luvisols (36 year old).
Key words: Classification, plantation, pedogenesis, Tectona grandis, , ,
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Cite this Reference:
A.M. Samndi and J.M. Jibrin, . Pedogenesis and Classification of Soils Under Teak (Tectona grandis Linn. f ) Plantation of Various Ages in the Southern Guinea Savanna of Nigeria. Asian Journal of Agricultural Sciences, (1): 16-25.
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ISSN (Online): 2041-3890
ISSN (Print): 2041-3882 |
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