Browsing by Author "Mugasha, A. G."

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Prevalence and standing volume of Dalbergia Melanoxylon in Coastal and Inland sites of Southern Tanzania
(Journal of Tropical Forest Science, 2000) Malimbwi, R. E.; Luoga, E. J.; Hofstad, O.; Mugasha, A. G.; Valen, J. S.
In order to determine the prevalence and standing volume of Dalbergia melanoxylon( mpingo), 120 sample plots were laid out in each of two districts, Kilwa and Nachingwea, representing coastal and inland woodlands in Lindi Region, southern Tanzania. Using data from felled trees, volume equations for various utilisation classes were constructed. Also estimated were the basic density of mpingo, the percentage content Of heartwood, sapwood, and heartrot, and the thickness of bark and sapwood.The basic density values for mpingo were 1.14,0.76 and 1.06 g cm' for heartwood, sapwood, and both heartwood and sapwood. These are multiplier factors to obtain biomass values from volume. The heartwood content of mpingo is 83% of the total volume and the rest (17%) is sapwood and bark. Based on a few logs observed 13% of the total volume may be expected to have heartrot. The sapwood thickness is 1.1 cm with little variation irrespective of log diameter. The bark is thin (3.7 mm) and soft making the tree susceptible to damage by bruising and fire.The inland forests have twice as much overbark volume of mpingo as the coastal forests with 10 and 5 m3 ha"1 respectively. The merchantable volume to 20 cm top diameter overbark is 4.4 and 1.7 m3 ha"1 accounting for only 43 and 33% of the total volume per hectare respectively. Since regeneration of mpingo is easy, there is no immediate need to classify mpingo as an endangered species provided fire control is enhanced as an important conservation measure. It is, however, appropriate to regard the species as threatened.
Survival, growth and wood density of Pinus Kesiya provenances at Buhindi, Mwanza, Tanzania
(Forest Research Institute Malaysia, 1999) Chamshama, S. A. O.; Chingonikaya, E. E.; Iddi, S.; Mugasha, A. G.; Nshubemukiand, L.; Malimbwi, R. E.
he objective of this study was to evaluate the performance of 13 Pinus hesiya provenances at Buhindi, Mwanza, Tanzania. Periodic data were collected on survival, breast height diameter and height. A final assessment was carried out at 18.3 y for survival, breast height diameter, height, stem form and basic density. Except for wood basic density, all other variables differed significantly (p<0.05) between provenances. The following provenances with satisfactory performance are recommended for small-scale planting at Buhindi: Benguet Kabayan and Zambales
Survival, growth, stem form and wood basic density of five Pinus Merkusii provenances at Buhindi, Mwanza, Tanzania
(1998) Mugasha, A. G.; Mgalla, H.A.; Iddi, S.; Nshubemuki, L.; Chamshama, S.A.O.; Malimbwi, R. E.
The performance of 16 Pinus oocarpa (including 5 now reclassified as Pinus patula spp. tecunumanii) provenances at Buhindi Mwanza, Tanzania: is evaluated in terms of survival, height growth, breast height diameter, basal area per ha, wood basic density and stem form. The final assessment was carried out at the age of 22 years. The main results of the study were: – Before angular transformation, survival varied from 77% (Rafael, Nicaragua) to 56% (Conacaste, Guatemala). However no significant difference (P >0.05) in survival was detected after such transformation. – Height growth showed significant differences (P< 0.05) at all ages. At 22 years the outstanding provenances were Siguatepeque (Honduras), Rafael (Nicaragua), and Zamorano (Honduras). Least height growth was shown by Bonete (Nicaragua) provenance. – Significant differences (P< 0.05) were detected in breast height diameter. Outstanding provenances were Yucul, Camelias (Nicaragua) and Mt. Pine Ridge-K49 (Belize). Least performers were Zamorano (Honduras) and Lagulnilla (Guatemala) provenances. – Significant differences (P< 0.05) were detected in basal area per ha development. The Bucaral (Guatemala) provenance was outstanding while least basal area development was recorded in the Conacaste, Lagunilla (Guatemala) and Siguatepeque (Honduras) provenances. – The Bucaral (Guatemala) provenance was significantly superior (P< 0.05) in wood basic density. Least wood basic density values were recorded from Camelias, Yucul, Rafael, Junquillo (Nicaragua), Angeles (Honduras) and the Lagumilla (Guatemala) provenances. – No significant differences (P >0.05) in stem form were observed. It is suggested that the 5 Pinus patula SCHIEDE and DEPPE ssp. tecunumanii (EQUILUZ and PERRY) provenances are likely candidates for species diversification in the Lake Victoria zone where the main plantation species is Pinus caribaea. However, noting that more than half of the natural distribution of P. oocarpa occurs outside central America, more provenances need to be tested to cover that extended range. Similarly, the sparse sampling of P. patula ssp. tecunumanii also needs additional representation. Restricting the results of this study to Pinus oocarpa, provenance ranking in diminishing order of performance gives: Bucaral (Guatemala), Zapotillo, Zamorano (Honduras), Chuacus (Guatemala), Siguatepeque (Honduras), Bonete, Junquillo (Nicaragua), Conacaste (Guatemala), Angeles (Honduras) and San Jose (Guatemala); and Lagunilla (Guatemala). In descending order of performance, suitable Pinus patula ssp. tecunumanii provenances are Mt. Pine Ridge (K49), Mt. Pine Ridge (K29), Rafael, Yucul and Camelias (Nicaragua).