Abstract
ABSTRACT Soil nitrogen mineralization patterns were investigated under field conditions in the presence of five leaf litters of different qualities, Faidherbia albida, Azadirachta indica, Andropogon gayanus, Casuarina equisetifolia, and Eragrostis tremula. The experimentation was conducted in a tropical sandy soil in central Senegal over 12 months. No relationship could be drawn between litter quality (N content, cellulose, hemicellulose, lignin) and N mineralization during this field experimentation. By contrast, the presence of the litter modified the soil N cycle. At all sampling dates, the patterns of N mineralization were most high in litter amendment. The content of mineral N was highest in Casuarina equisetifolia amendment (17.03 μg N g−1 soil in November 2000, and 28.53 μg N g−1 soil in March 2001). Soil incubated in the absence of the different litters exhibited a different pattern of N mineralization. Net mineralization was observed when the soil had been previously submitted to the influence of Casuarina equisetifolia (4.87 μg N g−1 soil), while net immobilization was observed in the case of Azadirachta indica (8.13 μg N g−1 soil).
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