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ArticleFarmer-managed natural regeneration (FMNR) on Nigeria's drylands: the influence of changing climate on agroforestry trees management
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.In Northern Nigeria, prolonged drought critically affects parkland tree regeneration and reduces land productivity and income. However, documentation of parkland trees management in extreme climatic conditions is scarce in the region. Hence, the need to evaluate the management via tree preferences by farmers on Nigeria’s dry agroecological zones (AEZ). To address this, field surveys were conducted in nine villages along a north-south transect, with precipitation increasing southwards through three AEZ of Nigeria: Sudan Savannah (SS), Northern Guinea Savannah (NGS) and Southern Guinea Savannah (SGS). Using Open Data Kit (ODK), information from 92 respondents and 4 focused groups relating to tree regeneration management were collected and aggregated. These include the abundance of the most preferred trees on farms, their regeneration potentials, management and propagation status, as well as usage and land-use constraints. Results showed drought- tolerant species (Parkia biglobosa and Mangifera indica) topped the dominant trees list across the three AEZ, both having 50% more than other agroforestry trees. Though farmers’ management strategies were highly relevant to regeneration and productivity, they did not differ across the zones (P<0.05) except at cropping outside tree canopy cover between SGS and SS using the Kruskal-Wallis test. Positive associations (0.5-0.8) between functions and preference for trees on farms for dominant agroforestry species. Farmers’ adaptation strategy to minimise risk to climate drivers and increase dry forests landscapes resilience made the driest AEZ (SS) had most species on farms and positively impacted the locals' livelihoods. Keywords: Trees, Drought, Farmers, Regeneration, Parklands ID: 3486501 -
DocumentA study on tree species and crops of agroforestry according to ecological geographic map in North Korea
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.This study was conducted to analyze the appropriate tree species and crops according to agroforestry target sites in North Korea based on ecological geography and site properties with the purpose of preparation of technical cooperation on agroforestry, one of the main agendas of the Inter-Korean Forest Cooperation Subcommittee. The agroforestry is one of the methods for forest restoration that satisfies both North Korea's fuel and food shortages and the restoration of deforested land and it began in 2003. To this end, the ecological geographic map (13 regions and 4 zones) of North Korea was made by using satellite images with North Korean journals. The target sites for agroforestry was classified according to 18 site conditions depending on 3 site characteristics (soil depth, relative location, slope), and divided as short-term and long-term target sites depend on agroforestry management period. And then, appropriate tree species and crops for agroforestry are selected according to them. By regions within the same zone, tree species and crops were mostly similar, but compared to each zone, they differed. This seems to be because the geographical climatic characteristics reflected in the ecological geographic map vary greatly from zone to zone. Through this, it is expected to provide information that can be more efficiently implemented through analysis of the target sites needed for application of agroforestry and needed for application of agroforestry management and the combination of suitable species and crops. Keywords: Deforestation and forest degradation, Research, Policies ID: 3623065 -
ArticleTaxonomic value of leaf epidermal markers in discriminating medicinal tree species of Apocynaceae Juss in Nigeria 2022
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No results found.Apocynaceae is a useful family comprising of trees notable for different medicinal remedies. Consequent to their importance vis-à-vis scarcity in the forest, they are being sold in various Nigerian markets by herb sellers mostly in sterile and fragmentary forms. Hence, the medicinal plants are subjected to adulteration and substitution. Identification of the plants by users is done via floristic markers, which are not readily available for such purpose. It becomes pertinent to carry out the taxonomic revision of these trees to provide additional markers that will contribute to their effective identification for correct use. Various documentations have been made on members of apocynaceae and are properly placed on their respective taxa using epidermal traits. However, such information is scarce for Alstonia boonei, Holarrhena floribunda, Rauvolfia vomitoria, Thevetia nerifolia and Vocanga africana. This study therefore aimed at providing epidermal taxonomic markers that could be employed in delimiting the species as an alternative when the fruit or floral parts are wanting. Leaf epidermises of five species of apocynaceae representing 5 genera were studied under a biological microscope with a camera attachment. Data obtained were statistically analyzed. The epidermal cell was penta or hexagonal in A. boonei and V. africana. The stomatal length varied from 20.88 µm (R. vomitoria) to 25.92 µm (T. nerifolia) and 18.96 µm (R. vomitoria) to 29.28 µm (V. africana) on the abaxial and adaxial layers respectively. All the epidermal characters on the adaxial layer were significantly different (p<0.05) among the species. Anticlinal walls were sinuated in H. floribunda and T. nerifolia while in R. vomitoria, it was straight to wavy. V. africana and A. boonei anticlinal walls were straight. This study represents the first account of epidermal characterization of the members of apocynaceae in Nigeria and is of taxonomic importance in setting boundaries among the species. Keywords: Human health and well-being, Biodiversity conservation, Genetic resources ID: 3486776
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