Tag: firewood
Significance of Mangrove Biodiversity Conservation in Fishery Production and Living Conditions of Coastal Communities in Sri Lanka
Assessing the merits of community level seedling production and distribution
One of the challenges facing projects that promote onfarmtree planting or forest plantations is how to provideseeds and seedlings at reasonable cost to planting sites.This can be overcome if planting is done on forest blocksites through the forestry department’s central nursery.Earlier attempts to promote community tree plantingbased on central nurseries operated by extension agentsor non-governmental organizations (NGOs) proved bothcostly and ineffective. To reduce costs, there are continuedefforts to decentralise seedling production anddistribution to community levels through groups or centralnurseries organized in schools, camps belonging tocommunity chiefs and privately managed nurseries.In the past, group nurseries often did not survive pastthe group formation or project support stage. Centralnurseries, also, were sometimes abandoned when fundingpriorities changed. Yet, there are success stories andmany farmers continue to be effectively reached throughsuch nurseries. Certain group nurseries, for instance,were left under the management of a single individualyet continue to supply seedlings to the community.Privately owned nurseries, in contrast, have been ableto survive for longer periods, albeit with little supportfrom developmental organizations. Depending on theoperating scenario, all three types (group, central andprivate) are feasible seedling supply alternatives and canevolve along with the awareness and tree planting cultureof the community.
Agroforestry and firewood production
The increasing recognition of the potential role of agroforestry as an integrated, sustainable and multiple-output land use system, and of the productive and protective value of trees on farmlands, is discussed. An overview is given of the types of agroforestry system found (with tables indicating various classifications and arrangements) and of the role of agroforestry in the production of biomass energy, particularly the use of multipurpose trees for fuelwood production in agroforestry systems. Examples of suitable species are given for different ecological regions and countries. Different management systems and programme options are discussed (in the light of recent forestry initiatives such as farm and community forestry, and woodlots) with a consideration of socioeconomic factors
Commercial pole production in linear agroforestry systems
While the stems of upperstorey trees in agroforestry systems have many uses such as firewood and fencing, it remains true that one incentive for growing upperstorey trees is the anticipated income generated by selling commercial quality poles. Three hundred and ninety-one poles representing 15 tree species grown under linear agroforestry conditions at four sites in Uganda were analyzed in terms of the length, diameter and taper of their poles. At the time of harvest, the trees were 41 months old. Although the poles varied in size and shape, none conformed to the standards observed in the commercial pole market in Kampala. The results demonstrate that linear agroforestry systems are unlikely to produce high quality commercial poles in a short time although they have other uses. Development of commercial pole production in these systems requires low cost management practices. New research designs and hypotheses are needed to assess the potential of commercial pole production. They must consider trials with larger plots, longer duration and varying management practices such as side pruning, spacing, coppicing and pollarding.
Gasifier as a cleaner cooking system in rural Kenya
Global demand for wood fuel energy is high and rising due to population increases, particularly in sub-Saharan Africa, where firewood and charcoal are the main sources of cooking energy. Inefficient cooking techniques consume large amounts of fuel and create indoor pollution, with negative health impacts particularly among women and small children. Efficient cooking stoves can potentially save fuel and reduce the health risks of smoke in the kitchen. This study compared the ease of use, energy consumption, fuel use efficiency and gas and particle emissions of a small-scale gasifier cooking stove with that of a traditional three-stone stove and an improved Hifadhi stove in a smallholder farming setting in Kenya. This was done by participatory evaluation of these cooking techniques by women on smallholder farms, assessing fuel consumption, time used in cooking and indoor air concentrations of carbon monoxide and fine particulate matter. It was found that compared with traditional and improved cooking stoves, the gasifier domestic cooking system saved 27-40% of fuel, reduced cooking time by 19-23% and reduced emissions by 40-90%. Thus the gasifier system has potential to alleviate energy and time poverty among small-scale farmers, while improving kitchen air quality. These new findings can assist in development of cleaner biomass cooking technologies in developing countries. Women who cooked using the gasifier preferred it to current cooking practices due to perceived benefits. Thus the gasifier is appropriate for rural areas; it constitutes a cleaner cooking system that saves fuel, produces charcoal for another round of cooking, cooks rapidly, and reduces indoor air pollution from cooking with biomass fuel. However, there is a need to improve the design to make it more stable and safer. © 2016 Elsevier Ltd. All rights reserved.
Chemical property of soil and mycorrhizal status in Allanblackia floribunda Oliver (Clusiaceae)
The objective of this study was to describe the type of mycorrhizal fungus that is associated with A. floribunda and evaluate the effect of soil chemical properties on its rhizosphere, its mycorrhizal dependency in its natural range in four populations of the species (Mouanko, Yalpenda, Nkenlikok and Mbalmayo), two land use systems (disturbed and undisturbed), two age classes (circumference less than 50cm and up to 50cm). Results obtained so far demonstrated that A. floribunda is colonized by arbuscular mycorrhizas. Root colonization was significantly (P < 0.01) different in the targeted populations with the highest observed in Yalpenda (53.63 ± 1.33%). Land disturbance significantly (P < 0.01) affected root colonization. Unperturbed soils displayed the highest root colonization (35.29 ± 0.70%). Age classes had significant (P < 0.001) influence on root colonization and trees with circumferences up to 50 cm had the highest percentage (35.45 ± 0.72%). There was no significant correlation between root colonization and phosphorus (R2 = 0.437, p = 0.563), in contrary to root colonization and copper (R2 = -0.934, p = 0.046). These results constitute a prerequisite for the inoculation phase and molecular analysis of roots already begun.
Raising the profile of woodfuels in the forest landscape restoration agenda
Forest landscape restoration (FLR) is being promoted as a means of tackling global challenges including land degradation, climate change, biodiversity conservation and sustainable development. However, as the FLR agenda gains momentum, it is critical that FLR initiatives pay sufficient attention in promoting the sustainable management of woodfuels, so far overlooked. In many regions, woodfuels (firewood and charcoal) are the main energy source for households and play a pivotal role in local economies; yet they are also associated with environmental degradation and adverse health outcomes. Here we examine the reasons why it is important to raise the profile of woodfuels within the FLR agenda and highlight the enabling conditions needed to promote sustainable management of woodfuels. In landscapes where woodfuel use is prevalent, FLR initiatives should consider enhancing wood fuel supply by growing trees, promoting fuel‐efficient cookstoves and kilns, and shifting pressure from natural forests and woodlands to planted trees. We argue that if wood fuel issues are considered in the design, implementation and monitoring of FLR initiatives and are supported by appropriate policies, resources and technical capacity, this will greatly enhance the sustainability and success of FLR initiatives.
Prosopis juliflora – a potential game changer in the charcoal sector in Kenya
Prosopis juliflora, locally known as ‘mathenge’, is a shrub or small tree that is native to Mexico, South America and the Caribbean, and is an invasive species in Kenya. In Kenya, Prosopis juliflora was introduced from 1973 through to the 1980s to arid and semi-arid areas to mitigate desertification and fuel wood shortages (Pimentel et al., 2000; Masakha & Wagulo, 2015). The species was preferred because of its resilience, drought tolerance and fast growth (Meyerhoff, 1991). However, it is aggressively invading about 500-1300 ha per year, causing land use and land cover change, and losses of grasslands, woodlands, croplands, grazing lands and settlements, especially in Turkana, Baringo, Garissa, Tana River and Taita Taveta Counties (Mbaabu et al., 2019; Eckert et al., 2020). By 2016, Prosopis juliflora had invaded 2 percent of Kenyan drylands, covering 18 792 hectares in Baringo County alone. In this County, Prosopis juliflora coverage is estimated to have increased by almost 4 percent or 640 ha per year since 2002 (Mbaabu et al., 2019). In Marigat Sub-County, Ng’ambo is the most highly invaded, whilst Ilchamus and Loboi are relatively less affected. Thus, management and utilization of the current 18 792 ha of Prosopis juliflora in Baringo County for charcoal production using improved kilns and effective transportation and marketing presents potential for improving livelihoods and the environment (Mbaabu et al., 2019). Various technologies with high charcoal conversion efficiencies of about 30 percent have been adapted and/or developed by Kenya Forest Research Institute (KEFRI) and other institutions.
Emission of volatile organic compounds during open fire cooking with wood biomass: Traditional three-stone open fire vs. gasifier cooking stove in rural Kenya
Cooking with wood biomass fuels releases hazardous air pollutants, including volatile organic compounds (VOCs), that often disproportionally affect women and children. This study, conducted in Kwale and Siaya counties in Kenya, employed thermal desorption gas chromatography – mass spectrometry to analyse VOC emissions from cooking with a wood biomass three-stone open fire vs. top-lit updraft gasifier stove. In kitchens with adequate ventilation, total VOC levels increased from 35–252 μg∙m−3 before cooking to 2235–5371 μg∙m−3 during open fire cooking, whereas use of a gasifier stove resulted in reduced emissions from cooking by 48–77 % (506–2778 μg∙m−3). However, in kitchens with poor ventilation, there was only a moderate difference in total VOC levels between the two methods of cooking (9034–9378 μg∙m−3 vs. 6727–8201 μg∙m−3 for the three-stone open fire vs. gasifier stove, respectively). Using a non-target screening approach revealed significantly increased levels of VOCs, particularly benzenoids, oxygenated and heterocyclic compounds, when cooking with the traditional open fire, especially in closed kitchens, highlighting the effects of poor ventilation. Key hazardous VOCs included benzene, naphthalene, phenols and furans, suggesting potential health risks from cooking. In kitchens with good ventilation, use of the gasifier stove markedly reduced emissions of these priority toxic VOCs compared to cooking with an open fire. Thus, substituting open fires with gasifier stoves could help to improve household air quality and alleviate health risks. The study revealed that VOCs were present prior to cooking, possibly originating from previously cooked food (buildup) or the outside environment. VOC emissions were also exacerbated by reduced air flow in high humidity during rainfall, suggesting an area for further research. The findings underscore the importance of adopting cleaner cooking technologies and enhancing kitchen ventilation to mitigate the impacts of VOCs in developing countries.