A study was conducted to assess the impacts of elevation, tree species and management on carbon stock on the slopes of Rungwe Mountain in Tanzania. Twenty 15 m radius plots with trees of DBH >10 cm were used to col...A study was conducted to assess the impacts of elevation, tree species and management on carbon stock on the slopes of Rungwe Mountain in Tanzania. Twenty 15 m radius plots with trees of DBH >10 cm were used to collect trees measurements as well as soil samples at depths of 10 cm, 20 cm and 30 cm. Tree data collected were calculated and analyzed for tree biomass and carbon by using the Tree Biomass Equations (TBE) while soil samples were analyzed for total soil carbon using oxidative reduction method in which soils were combusted at about 600°C in a muffle furnace to released CO2 and SO2 gases carried by the oxygen flow into cells. The results showed that aboveground carbon content increased with altitude ranging from 9.2 t/ha at 2031 m to 561.7 t/ha at 2312 m.a.s.l due to little forest disturbance at high altitudes. However, the trend changed drastically at 2312 m.a.s.l. Soil carbon content tended to increase down the slope ranging from 3.8 t/ha at 2.312 to 4.7 t/ha at 2031 m.a.s.l, respectively. In general, there is limited awareness on sustainable management of forest resource in the study area. It is necessary to empower local communities to monitor and manage their forest resources so that they can contribute to climate change mitigation and income generation through carbon trade under REDD initiative.展开更多
This study aimed at prioritizing medicinal plants used to manage HIV/AIDS opportunistic infections and assessing their wild population status. Data were collected using focus group discussions and inventories. Prefere...This study aimed at prioritizing medicinal plants used to manage HIV/AIDS opportunistic infections and assessing their wild population status. Data were collected using focus group discussions and inventories. Preference ranking and Microsoft Excel and QGIS software were used for data analysis. Up to seven species were prioritized as the most important in the disease management. It was also found that the species dominated the landscape with elevation between 1950 to 2050 masl. Moreover, the species displayed linear pattern distribution adjacent rivers. With regards to population structure, the species revealed <em>J</em>-shaped curves. The species density was 200/ha for <em>Hagenia abyssinica</em> and 28/ha for <em>Myrica salicifolia</em>. The dominance of species in higher altitudes as cited above indicates that they flourish well in highlands. The tendency of them to grow adjacent water sources reveals their water or moisture loving. Moreover, the <em>J</em>-shaped curves observed imply poor recruitment and hence unsustainable. The study recommends for urgent conservation plans especially on the sampled species. There is a need to ensure strict measures are put in place to safeguard the medicinal plant species to ensure their sustainability.展开更多
文摘A study was conducted to assess the impacts of elevation, tree species and management on carbon stock on the slopes of Rungwe Mountain in Tanzania. Twenty 15 m radius plots with trees of DBH >10 cm were used to collect trees measurements as well as soil samples at depths of 10 cm, 20 cm and 30 cm. Tree data collected were calculated and analyzed for tree biomass and carbon by using the Tree Biomass Equations (TBE) while soil samples were analyzed for total soil carbon using oxidative reduction method in which soils were combusted at about 600°C in a muffle furnace to released CO2 and SO2 gases carried by the oxygen flow into cells. The results showed that aboveground carbon content increased with altitude ranging from 9.2 t/ha at 2031 m to 561.7 t/ha at 2312 m.a.s.l due to little forest disturbance at high altitudes. However, the trend changed drastically at 2312 m.a.s.l. Soil carbon content tended to increase down the slope ranging from 3.8 t/ha at 2.312 to 4.7 t/ha at 2031 m.a.s.l, respectively. In general, there is limited awareness on sustainable management of forest resource in the study area. It is necessary to empower local communities to monitor and manage their forest resources so that they can contribute to climate change mitigation and income generation through carbon trade under REDD initiative.
文摘This study aimed at prioritizing medicinal plants used to manage HIV/AIDS opportunistic infections and assessing their wild population status. Data were collected using focus group discussions and inventories. Preference ranking and Microsoft Excel and QGIS software were used for data analysis. Up to seven species were prioritized as the most important in the disease management. It was also found that the species dominated the landscape with elevation between 1950 to 2050 masl. Moreover, the species displayed linear pattern distribution adjacent rivers. With regards to population structure, the species revealed <em>J</em>-shaped curves. The species density was 200/ha for <em>Hagenia abyssinica</em> and 28/ha for <em>Myrica salicifolia</em>. The dominance of species in higher altitudes as cited above indicates that they flourish well in highlands. The tendency of them to grow adjacent water sources reveals their water or moisture loving. Moreover, the <em>J</em>-shaped curves observed imply poor recruitment and hence unsustainable. The study recommends for urgent conservation plans especially on the sampled species. There is a need to ensure strict measures are put in place to safeguard the medicinal plant species to ensure their sustainability.
