Browsing by Subject "Soil carbon stock"
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Item Agroforestry System and Their Carbon Stock in Terai and Mid-Hill Regions of Central Nepal(Department of Botany, 2015) Kafle, ShashiTrees and forests play a critical role in human livelihood as well as in ecosystem functioning. Agricultural emissions from crop and livestock production grew from 4.7 billion tons of CO eq. per year in 2001 to over 5.3 billion tons in 2011 due to agriculture fermentation. Compensation in loss of biodiversity, concern of food security, improvement in the living standard by generating income and the global issue of climate change related with carbon sequestration can be addressed with the scientific knowledge of agroforestry system. It can directly store carbon in tree components and potentially slows down the deforestation rate by reducing the need to clear forest land for agriculture. In the country like Nepal which is very suitable for agriculture, the agroforestry practice can be highly demanding for the overall growth of the nation. The study was carried out in Terai and mid-hill physiographic region. This study focuses mostly on the species grown in the home garden for the various purposes and to determine the total carbon stock of these two regions. The plot of 20×20m 2 was set up and the trees inside the plot were listed, counted and the various parameters like dbh, angle of elevation and distance between the observer and tree were measured for biomass carbon stock. The study was conducted in 30 home-gardens from Terai and 50 from midhill. Total 171 species were recorded in the study. Shannon's index was 1.247 in Terai and 1.216 in mid-hill. Simpson's index was 0.0915 in Terai and 0.087 in mid-hill. The total mean tree trunk volume was found to be 17.46 m 3 /ha. The average total biomass was significantly greater in Terai (21.314 t/ha) than in mid-hill (11.203 t/ha). The mean of total biomass carbon stock was found to be 10.255 tons C / ha and 5.24 tons C / ha for Terai and mid-hill respectively. The soil was collected from 0-20 cm depth. 80 soil samples were air dried and brought to laboratory for further analysis of soil carbon stock. The study found the soil bulk density to be 1.38 g/cm 3 in Terai and 1.076 g/cm in midhill region. The soil carbon stock was found to be 61.17 t C ha -1 in Terai and 67.608 t C ha -1 in mid-hill. The biomass carbon stock and soil carbon stock were summed up to obtain the total carbon stock. However, the study found no significant difference in the total carbon stock between the two regions i.e. 71.433 t C/ha in Terai and 72.856 t C/ha in mid-hill. 2 3 Though agroforestry does not contribute as much as the forest, however, it can store enough significant amount of carbon when designed in a proper way. Thus, agroforestry system can be proved to be one of the best alternatives to cope with the alarming problem of biodiversity loss, food security and climate change. Starting from a small area around the home, it can create its impact to the global scale. Keywords: Species diversity, Uses, Biomass carbon stock, Soil carbon stock.Item Carbon Stock of Selected Tree Species in A Community Managed Tropical Forest of Rupandehi District, Western Nepal(Department of Botany, 2012) Shrish, OkmayaForest ecosystems play a critical role in the global carbon cycle, sequestering CO2 through photosynthesis and storing carbon in plant biomass and in soil organic matter. So, forests have asignificant potential to capture carbon and thus could play important role in climate change mitigation. Tropical forest also plays a significant role in carbon stock and climate change. For the present study four forest sites (1,2.3 and 5) was selected out of the seven sites of the community forest,(1,2,3,4,5,6 and 7) , sites 1 and 2 were dominated by Dalbergia sissoo and sites 3 and 5 were dominated by Shorea robusta. The forest sites 1 and 2 was collectively taken as the Dalbergia sissoo dominated sites, similarly site 3 and 5 was collectively taken as Shorearobusta dominated sites. For this study about 32 Quadrats of size 10×10 m were laid randomly.Altogether biomass and soil carbon stock of 16 Quadtrats of each dominated site were compared.The biomass was converted to carbon stock. Soil was sampled from the depth of 0-10 cm and 10-20 cm in each site. Total of 64 soil samples were collected. The sampled soils were air dried and brought to the laboratory for the further analysis. Bulk density and soil carbon stock were calculated at different horizontal depth of 0-10 cm and 10-20 cm. Then, biomass carbon and soilcarbon were summed up to get total carbon stock.The mean biomass, biomass carbon stock and soil carbon stock of the selected sites of Community Forest of Karahiya VDC were 436.60 Mg/ha, 205.12 C Mg/ha, 66.21 C Mg/ha. From the research it was found that the total mean biomass carbon stock was not significantly different in sites dominated by Dalbergia sissoo and Shorea robusta. The total mean biomass carbon stock were 221.70 C Mg/ha and 188.55 Mg/ha in the Dalbergia sissoo and Shorearobusta dominated sites.The mean soil carbon stock in Shorearobusta dominated sites of the forest was significantly higher (81.40 Mg/ha) than in the Dalbergia sissoo dominated sites(51.00Mg/ha). Soil carbon stock and soil bulk density were not significantly different with depth. The bulk density at different depth were not significantly different 0.935 gm/cm at 0-10 cm and 0.944 gm/cm 3 at 10-20cm. The total mean bulk density in Dalbergia sissoo and Shorea robusta dominated site were not significantly different 0.957 gm/cm 3 .Keywords: Tropical Community forest, Dalbergia sissoo, Shorea robusta, Biomass carbon stock, Soil carbon stock.