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University of Khartoum (2004)

Assessment of Rate of Decomposition and Nutrient Release from Leaf Residue of some Tree Species

Ahmed Mohamed El-Bashir, Ahlam

Titre : Assessment of Rate of Decomposition and Nutrient Release from Leaf Residue of some Tree Species

Auteur : Ahmed Mohamed El-Bashir, Ahlam

Université de soutenance : University of Khartoum

Grade : Master of Science (MS) 2004

Résumé
A field experiment was carried out with the main objective of determination of decomposition and nutrient release of leaf litter of the threeselected tree species based on their C/N ratios. Low C/N ratio was represented by Leucaena leucocephala, medium C/N ratio was represented by Ficus benegalensis, and high C/N ratio was represented by Eucalyptus camaldolensis. Fresh leaf samples (40g) of the mentioned tree types were buried 20 cm in the soil under Shambat semi-arid tropics condition, over a period of three months. Samples were drawn at intervals of 1, 2, 3, 4, 6, 8, 10, and 12 weeks. Samples were analyzed for remaining dry matter weight, carbon, nitrogen, phosphorus, and potassium. 14 Results showed that Leucaena decomposed significantly (P<0.05) faster than Ficus and Eucalyptus. Also, it released C and N faster than Ficus and Eucalypt ; C released was significantly (P<0.05) higher than that of the other species tested. While N accumulated in Ficus and Eucalypt, only 66.8% of the N content in Leucaena was remained after the first week. Ficus released P significantly (P<0.01) higher than Leucaena at the beginning stages. And Eucalyptus released K significantly (P<0.01) higher than Ficus and Leucaena at the end of the period of incubation. The dry matter decay and C release rate were similar in the three species. However, N accumulated near double in Eucalyptus (180.7%) and one third percentage in Ficus (136.3%) in the first stages. This showed that the C/N ratio is not the only indicator to decide the rate of decomposition and nutrient release. The K and P releasing rates were rapid in the first stages (R2 0.73-0.92) in the three species. This study suggests that Leucaena constitutes a readily available source of N, and could be consider a high leguminous tree resource quality to microorganisms, however it is important to add

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