Rooting pattern of acacia mangium in pure and mixed stands of eucalyptus camaldulensis, Tectona grandis and casuarina montana in the coastal Tanzania

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dc.contributor.authorKilawe, Charles Joseph
dc.date.accessioned2022-09-13T11:37:08Z
dc.date.available2022-09-13T11:37:08Z
dc.date.issued2011
dc.descriptionMaster Degree of European Forestryen_US
dc.description.abstractThis study investigates if Tectona grandis, Casuarina montana and Eucalyptus camaldulensis planted in mixture with Acacia mangium would send their roots toward Acacia in attempt to benefit from its symbiotic nitrogen fixation ability and also to investigate if the roots of mixed tree species would occupy different vertical soil layers for better utilization of site resources. A soil core method was used for root and soil sampling in a 22 months old mixed stand of E. camaldulensis (E), C. montana (C), T. grandis (T) and A. mangium (A) in a 1A:8A; 1A:8E; 1A:8T; 1A:8C; 1E: 8A; 1T:8A and 1C: 8A species combination replicated at three sites. Lateral distribution showed a decreasing root biomass with increasing distance from the tree stem. The highest total root biomass was obtained at 20 cm distance reaching 306.05 g m -2 for Acacia, 229.19 g m -2 for Eucalyptus 156.5 g m -2 for Tectona and 127.0 g m -2 for Casuarina. The lowest total root biomass was observed at 180 cm distance reaching 5.44 g m -2 for Acacia and 0.01 g m -2 for Eucalyptus, Casuarina and Tectona. Lateral spread of other species was higher in the upper layer (0-10 cm) with high density of A. mangium and high in the lower layer (10-20 cm) with low density of A. mangium in the species combination. Vertical distribution revealed a decrease in root biomass with increasing soil depth for all species except T. grandis. Mean root biomass decreased from 162.41 (acacia) to 4.58 g m -2 (teak) in the 0-10 cm layer to 90.26 (acacia) to 5.40 (casuarina) g m -2 in the 10-20 cm layer. Also fine root biomass was high in the upper layer and coarse root biomass was high in the lower layer. It is concluded that, there was not sufficient evidence of other species sending their roots toward A. mangium but there was clear vertical niche separation between A. mangium and other species, particularly with T. grandisen_US
dc.identifier.urihttp://www.suaire.sua.ac.tz/handle/123456789/4563
dc.language.isoenen_US
dc.publisherBoku Universityen_US
dc.subjectAcacia mangiumen_US
dc.subjectEucalyptus camaldulensisen_US
dc.subjectTectona grandisen_US
dc.subjectCasuarina montanaen_US
dc.subjectNurse treeen_US
dc.subjectRoot distributionen_US
dc.subjectRoot biomassen_US
dc.subjectRooting patternen_US
dc.subjectMixed speciesen_US
dc.titleRooting pattern of acacia mangium in pure and mixed stands of eucalyptus camaldulensis, Tectona grandis and casuarina montana in the coastal Tanzaniaen_US
dc.typeThesisen_US

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