Soil organic matter (SOM) has a key role in maintaining soil fertility in weathered soils in the tropics. This study was conducted to determine the contribution of different SOM fractions to the cation exchange capacity (CEC) of a tropical soil as influenced by organic matter inputs of different biochemical composition. Soil samples were collected from a 16-yr old arboretum established on a Ferric Lixisol, under five multipurpose tree species: Leucaena leucocephala, Dactyladenia barteri, Afzelia africana, Pterocarpus santalinoides, and Treculia africana. Fractions were obtained by wet sieving and sedimentation after dispersion with Na2CO3. Fractions larger than 0.053 mm were separated into mineral and organic components by flotation on water. Relationships between CEC and pH were determined using the silverthioureum-method. For all treatments the organic fractions had the highest CEC, expressed on a dry matter basis, and the CEC of the fractions smaller than 0.053 mm was inversely related to their particle size: clay (< 0.002 mm) > fine silt (0.002–0.02 mm) > coarse silt (0.02–0.053 mm). A positive correlation (significant at the 0.01 probability level) existed between the slope of the fitted CEC-pH relationships and the organic C concentrations of the whole soil and both silt fractions. The clay and fine silt fractions were responsible for 85 to 90% of the CEC of the soil. Organic inputs with a high C/N and lignin/N ratio produced fine and coarse silt sized SOM fractions with the highest charge density. Therefore, inputs of slowly decomposing organic residues seem to be promising for increasing the CEC of highly weathered soils.
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Amato M (1983) Determination of carbon 12C and 14C in plant and soil. Soil Biology & Biochemistry 15: 611-612
Anderson DW, Saggar S, Bettany JR and Stewart JWB (1981) Particle size fractions and their use in studies of soil organic matter: I. The nature and distribution of forms of carbon, nitrogen and sulfur. Soil Science Society of America Journal 45: 767-772
Catroux G and Schnitzer M (1987) Chemical, spectroscopic and biological characteristics of the organic matter in particle size fractions separated from an Aquoll. Soil Science Society of America Journal 51: 1200-1207
Chabbra R, Pleysier J and Cremers A (1975) The measurement of the cation exchange capacity and exchangeable cations in soils: a new method. In: Proc Int Clay Conf Mexico City, pp 439-449. Applied Publ Ltd, Wilmette, Illinois
Christensen BT (1992) Physical fractionation of soil and organic matter in primary particle size and density separates. Advances in Soil Science 20: 1-90
Curtin D, Huang PM and Rostad HPW (1987) Components and particle size distribution of soil titratable acidity. Soil Science Society of America Journal 51: 332-336
Drake EH and Motto HL (1982) An analysis of the effect of clay and organic matter content on the cation exchange capacity of New Jersey soils. Soil Science 133: 281-288
Dudas MJ and Pawluk S (1970) Naturally occuring organo-clay complexes of orthic black chernozems. Geoderma 3: 5-17
Duxbury JM, Smith MS, Doran JW, Jordan C, Szott L and Vance E (1989) Soil organic matter as a source and a sink of plant nutrients. In: Coleman DC, Oades JM and Uehara G (eds) Dynamics of soil organic matter in tropical ecosystems, pp 33-67. University of Hawaii Press, Honolulu, HI
Fox RH, Myers RJK and Vallis I (1990) The nitrogen mineralization rate of legume residues in soil as influenced by their polyphenol, lignin and nitrogen contents. Plant and Soil 129: 251-259
Gallez A, Juo ASR, Herbillon AJ and Moormann FR (1975) Clay mineralogy of selected soils in southern Nigeria. Soil Science Society of America Proceedings 39: 577-585
Gallez A, Juo ASR and Herbillon AJ (1976) Surface and charge characteristics of selected soils in the tropics. Soil Science Society of America Journal 40: 601-608
Gee GW and Bauder JW (1986) Particle-size analysis. In: Klute A (ed) Methods of soil analysis. Part 1 2nd ed., pp 383-411. Agron Monogr 9. ASA and SSSA, Madison, WI
Kachaka S, Vanlauwe B and Merckx R (1993) Decomposition and nitrogen mineralization of prunings of different quality. In: Mulongoy K and Merckx R (eds) Soil organic matter dynamics and sustainability of tropical agriculture, pp 199-208. John Wiley, Chichester, UK
Kang BT and Akinnifesi FK (1994) Performance of selected woody agroforestry species grown on an Alfisol and an Ultisol in the humid lowland of West Africa, and their effects on soil properties. Journal of Tropical Forest Science 7: 303-312
King HG and Heath GW (1967) The chemical analysis of small samples of leaf material and the relationship between the disappearance and composition of leaves. Pedobiologia 7: 192-197
Marcano-Martinez E and McBride MB (1989) Comparison of the titration and ion adsorption methods for surface charge measurements in Oxisols. Soil Science Society of America Journal 53: 1040-1045
Melillo JM, Aber JD and Muratore JF (1982) Nitrogen and lignin control of hardwood leaf litter decomposition dynamics. Ecology 63: 621-626
Morais FI, Page AL and Lund LJ (1976) The effect of pH, salt concentration, and nature of electrolytes on the charge characteristics of Brazilian tropical soils. Soil Science Society of America Journal 40: 521-527
Oades JM, Gillman GP, Uehara G, Hue NV, van Noordwijk M, Robertson GP and Wada K (1989) Interactions of soil organic matter and variable-charge clays. In: Coleman DC, Oades JM and Uehara g (eds) Dynamics of soil organic matter in tropical ecosystems, pp 69-95. University of Hawaii Press, Honolulu, HI
Palm CA and Sanchez PA (1991) Nitrogen release from the leaves of some tropical legumes as affected by their lignin and polyphenolic contents. Soil Biology & Biochemistry 23: 83-88
Pleysier JL and Juo ASR (1980) A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges. Soil Science 129: 205-211
Sanchez PA, Izac A-M, Valencia I and Pieri C (1996) Soil fertility replenishment in Africa: a conceptual note. In: Breth SA (ed) Achieving greater impact from research investments in Africa, pp 200-207. Proceedings Workshop Addis Ababa, 26-30 September 1996 SAS (1985) SAS user's guide: Statistics (5th ed). SAS Institute Inc, Cary, NC, USA
Schnitzer M (1978) Humic substances: chemistry and reactions. In: Schnitzer M and Khan SU (eds) Soil organic matter, pp 1-58. Elsevier, New York
Stevenson FJ (1982) Humus chemistry: genesis, composition, reactions. John Wiley, New York, 443 pp
Tate KR and Theng BKG (1980) Organic matter and its interactions with inorganic constituents. In: Theng BKG (ed) Soils with variable charges, pp 225-249. New Zealand Society of Soil Science, Lower Hutt
Tian G, Kang BT and Brussaard L (1992) Biological effects of plant residues with contrasting chemical compositions under humid tropical conditions-decomposition and nutrient release. Soil Biology & Biochemistry 24: 1051-1060
Van Dijk H (1971) Colloid chemical properties of humic matter. In: McLaren AD and Skujins J (eds) Soil biochemistry, Vol 2, pp 16-35. Marcel Dekker, New York
Van Soest PJ (1963) Use of detergents in the analysis of fibrous feeds. II. A rapid method for determination of fiber and lignin. Journal of the Association of Official Analytical Chemists 46: 829-835
Van Soest PJ and Wine RH (1967) Use of detergents in the analysis of fibrous feeds. IV. Determination of plant cel wall constituents. Journal of the Association of Official Analytical Chemists 50: 50-55
Vanlauwe B, Sanginga N and Merckx R (1998) Soil organic matter dynamics after addition of nitrogen-15-labeled Leucaena and Dactyladenia residues. Soil Science Society of America Journal 62: 461-466
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Oorts, K., Vanlauwe, B., Cofie, O.O. et al. Charge characteristics of soil organic matter fractions in a Ferric Lixisol under some multipurpose trees. Agroforestry Systems 48, 169–188 (2000). https://doi.org/10.1023/A:1006361229778
- biochemical composition
- cation exchange capacity
- particle size fractions
- soil organic matter