Quantification of the above ground carbon stock (AGC) is important in sustainable forest management and policy advice on climate change mitigation. Traditional ground vegetation survey methods have been used to provid...Quantification of the above ground carbon stock (AGC) is important in sustainable forest management and policy advice on climate change mitigation. Traditional ground vegetation survey methods have been used to provide data for estimation of AGC stock but constrained by inadequate time and often too costly. Remote sensing when combined with few ground collected data has the potential of improving forest resource assessment even though this opportunity has not well been utilised. In this study, we mapped AGC through combination of ground survey data collected from 51 permanent sapling plots with Normalized Difference Vegetation Index (NDVI) derived from Landsat 5 Thematic Mapper image. Linkage of the two data sources was made during a training stage of supervised classification. The overall classification accuracy was 98%, suggesting that reliable estimate of AGC for a large area can be made through combination of medium resolution satellite imagery and few samples from the ground.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 J-shaped curves. The species density was 200/ha for Hagenia abyssinica and 28/ha for Myrica salicifolia. 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 J-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Quantification of the above ground carbon stock (AGC) is important in sustainable forest management and policy advice on climate change mitigation. Traditional ground vegetation survey methods have been used to provide data for estimation of AGC stock but constrained by inadequate time and often too costly. Remote sensing when combined with few ground collected data has the potential of improving forest resource assessment even though this opportunity has not well been utilised. In this study, we mapped AGC through combination of ground survey data collected from 51 permanent sapling plots with Normalized Difference Vegetation Index (NDVI) derived from Landsat 5 Thematic Mapper image. Linkage of the two data sources was made during a training stage of supervised classification. The overall classification accuracy was 98%, suggesting that reliable estimate of AGC for a large area can be made through combination of medium resolution satellite imagery and few samples from the ground.
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 J-shaped curves. The species density was 200/ha for Hagenia abyssinica and 28/ha for Myrica salicifolia. 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 J-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.
