Browsing by Author "Maliondo, S. M."
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Item Genotype and soil fertility interaction in the growth of black spruce progeny from a central New Brunswick population(Canadian Journal of Forest Research, 1984) Maliondo, S. M.; Krause, H. H.Seedlings representing 10 half-sib families from a black spruce (Piceamariana (Mill.) B.S.P.) stand in central New Brunswick were raised in a greenhouse on three different soils, each with two levels of fertility. Seedling growth varied significantly with soil, fertility, and half-sib family. After 7 months mean dry weights, for example, ranged from 0.292 to 0.755 g with soil, 0.174 to 0.936 g with level of fertility, and 0.370 to 0.657 g with family. With soil and fertility considered fixed variables, the family and family–fertility interaction accounted for approximately 3 and 20% of the phenotypic variation in mean seedling dry weight, respectively. Similar variance components were observed for shoot and root weights, and root collar diameter. Based on the family – soil fertility interaction, the population was divided into groups of (i) broadly adapted families showing average performance through the full range of fertility environments, (ii) strong responders, i.e., families performing below average at low fertility, but showing a large fertilization response, and (iii) weak or nonresponders, i.e., families performing poorly in all fertility environments.Item The potential of afromontane rain forests to mitigate carbon emissions in Tanzania(2004-07-10) Maliondo, S. M.; Msanya, B. M.; Munishi, P. K. T.; Temu, R. P. C.One of the major ways of mitigating carbon emissions is by emission avoidance or conserving existing carbon (C) pools on the land through slowing deforestation or improved forest harvesting practices. Field measures of tree dimensions and chemical soil analysis for organic carbon were used to quantify the carbon (C) storage potential of three tropical montane rain forest ecosystems; one on the slopes of Mount Kilimanjaro and two (Usambara and Uluguru) in the Eastern Arc Mountains of Tanzania. The above ground and root carbon of trees ranged from 295±8 to 5/7 ± /7 o:'. The tree carbon storage was lowest in the Kilimanjaro forest (295±8 (SD) t h"), and highest in the Usambara forest (5/7 ± /7 (SD) t s'. The C storage in the Ulugurus was 388± /0 (SD) t «'. The soil carbon storage (/423.7 t h") in Kilimanjaro was significantly higher than that in tree biomass. On the other hand the soil carbon (4/8 ± /00 and 295 ± 53 t h") in the Usambara and Uluguru respectively) was significantly lower than the biomass carbon in both forests in the Eastern A rc forests. The potential of these ecosystems to act as carbon sink and mitigate greenhouse gas emissions is evident. This capacity for carbon storage. population pressure and the extensiveness of these forests in the region makes their conservation of global significance for carbon emission mitigation.Item Transformation of shifting cultivation: Extent, driving forces and impacts on livelihoods in Tanzania(ELSEVIER, 2018) Kilawe, C. J.; Mertzb, O.; Silayo, D. A.; Birch-Thomsen, T.; Maliondo, S. M.Shifting cultivation is in rapid transformation in many parts of the Global South, but the drivers and consequences of these changes are still not well understood, especially in Africa. We therefore analysed the drivers of this transformation and its impacts on livelihoods between 1995 and 2014 in two villages located in Eastern Central Tanzania by combining analysis of socio-economic and remote sensing data. Results revealed that in an upland village, the number of shifting cultivators declined from 34% to 16% and the area changed from 19% to 17%.Inaplateauvillage,thenumberofshifting cultivatorsdeclinedfrom24%to18%andtheareasubstantially declined from23% to 14%. Inboth villages, shifting cultivators adoptedintensive land preparation methods that involved deep tillage and burying of vegetation. Transformation of shifting cultivation in the upland area was driven by adoption and enforcement of land tenure policies that restrict shifting cultivation whereas in the plateau area, it was driven by population pressure causing competition for land between shifting cultivators and pastoralists. In both villages transformation of shifting cultivation negatively affected household income and increased periods of food insecurity.