A B S T R A C TThe aim of this study was to evaluate the nutrient content of leaf litter and the soil beneath the crown of gliricidia (Gliricidia sepium) and sabiá (Mimosa caesalpiinifolia) under different planting densities (400, 600, 800, 1000 and 1200 plants ha -1 ). The experiment was carried out in a randomized block in split plot design, with three replications. The species were assigned to the plots and the densities to the subplots. Samples of litter and soil were collected three years after the trees were planted and submitted for chemical analysis. The Mg content in the litter from the gliricidia was higher than that from the sabiá. There was no difference between the species as to the other elements. The increase in planting density reduced the levels of N and Mg, but did not alter the levels of Ca and P in the litter. The nutrient content in the litter from both species presented the sequence Ca > N > Mg > K > P. There was no difference in soil fertility between soils planted with both species. An increase in density resulted in an increase in the levels of P and Mg in the soil. The contents of Na and Ca first increased and then decreased with the increase in density. The density had no effect on organic matter, K, pH or the potential acidity.Fertilidade do solo sob a copa de espécies arbóreas submetidas a densidades de plantio R E S U M O Objetivou-se, neste trabalho, avaliar os teores de nutrientes da serapilheira e do solo sob a copa da gliricidia (Gliricidia sepium) e sabiá (Mimosa caesalpiinifolia) em densidades de plantio (400, 600, 800, 1000 e 1200 plantas ha -1 ). O experimento foi realizado em blocos ao acaso com três repetições em parcelas subdivididas. As espécies foram aplicadas nas parcelas e as densidades nas subparcelas. As amostras da serapilheira e do solo foram coletadas três anos após o plantio das árvores e submetidas às análises químicas. O teor de Mg na serapilheira da gliricidia foi superior ao da sabiá. Não houve diferença entre espécies quanto aos demais elementos. O aumento da densidade de plantio diminuiu os teores de N e Mg mas não alterou os teores de Ca e P, na serapilheira. As quantidades dos teores dos nutrientes na serapilheira das duas espécies apresentaram a sequência Ca > N > Mg > K > P. Não ocorreu diferença entre solos cultivados com as duas espécies na fertilidade do solo. O aumento da densidade aumentou os teores de P e Mg no solo. Os teores de Ca e Na aumentaram e depois diminuíram com o aumento da densidade. Não se constatou efeito de densidade na matéria orgânica, K, pH nem na acidez potencial.
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