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ArticleAssessment of enrichment planting of teak (Tectona grandis L.f.) in degraded dry deciduous dipterocarp forest in the Central Highlands, Viet Nam
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.After years of unsustainable logging, dry deciduous dipterocarp forest (DDDF) has become poor in timber stocks and has been converted to industrial crops such as rubber. The objectives of this study were to assess teak (Tectona grandis L.f.) tree establishment under degraded DDDF conditions and to determine factors that influence the suitability of teak as a forest enrichment tree species. A set of 64 experimental plots of 4900 m2 each was set up and observed for 4–5 years for testing enrichment planting with teak under various combinations of two groups of factors: ecological conditions and forest status. Weighted, non-linear, multivariate regression models were used to detect key factors that influenced the suitability of teak. The results showed that at the age of 4 years the average dominant tree height (defined as 20% of the tallest trees in the experimental plot) reached 11.2, 7.8, 5.3 and 3.8 m for very good, good, average, and poor suitability levels, respectively. Survival rates of planted teak from average to very good suitability levels were over 90%. Six key factors that affected the suitability of teak were waterlogging during the rainy season, altitude, stand volume of the degraded DDDF, soil type, percentage of sand and concentration of P2O5 in the soil. Under the extreme ecological and environmental conditions of the DDDF, enrichment planting with teak gave promising results. Keywords: degraded dipterocarp status, dipterocarp enrichment, teak suitability assessment. ID: 3472951 -
ArticleDeveloping simultaneously modeling systems for improving the reliability of tree aboveground biomass- carbon and its components estimates for Machilus odoratissimus nees in the central highlands, Viet Nam
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Machilus odoratissimus Nees is a multi-purpose species with, high economic value and environmental protection, so this tree species is commonly used in agroforestry models. In plantation management, it demands modeling systems that predict accurately aboveground biomass- carbon and its components. At the same time, the developed models support computing carbon accumulation of forest trees in agroforestry models for the program of reducing emissions from deforestation and forest degradation (REDD). Twenty-two 300 m2 plots were measured within the full range of 1 to 7 ages in the Central Highlands of VietNam. A total of 22 quadratic mean diameter trees were destructively sampled to obtain a dataset of the dry iomass/carbon of the stem (Bst/Cst), bark (Bba/Cba), branches (Bbr/Cbr), leaves (Ble/Cle), and total tree aboveground biomass/carbon (AGB/AGC). We examined the performance of weighted nonlinear models fit by maximum likelihood and weighted nonlinear seemingly unrelated regression (SUR) fit by generalized least squares for predicting tree aboveground biomass- carbon and its components. The simultaneous estimation of AGB/AGC and its components produced a higher reliability than that of the models of tree components and the total developed separately. The selected forms of modeling systems were AGB = Bst + Bba + Bbr + Ble = a1×(D2H)b1 + a2×(D2H)b2 + a3×Db3 + a4×(D2H)b4 and AGC = Cst + Cba+ Cbr + Cle = a1×(D2H)b1 ++2×(D2H)b2 + a3×Db3 + a4×(D2H)b4 (where D is the diameter at breast height and H is the height of the tree). Keywords: Agroforestry, Machilus odoratissimus, seemingly unrelated regression (SUR), tree biomass- carbon ID: 3472953 -
DocumentThe current situation and perception analysis of forest carbon offset scheme in Korea
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.As the international community pays attention to the absorption of carbon using forests, Korea has been operating the Forest Carbon Offset Scheme since 2013. However, monitoring performance to be performed for certification is sluggish, and it was found that there is a limit to sustainable operation. This study aims to analyze current situation and perception of Forest Carbon Offset Scheme in Korea to suggest problems and direction of improvement.
Through literature surveys and interviews, in-depth interview questions were selected, and people in charge of transaction-type projects were interviewed in-depth. The Survey was conducted on people in charge, and the characteristics of perception were analyzed through descriptive statistical and frequency analysis.
The main expected effect was profit generation, and the overall perception of the expected effect decreased. Hindrances were in the order of "Concern about transaction possibilities", "Complexity of certification procedure", "Lack of competent professionals", "Lack of support costs for project planning", "Administrative delay" and "Lack of project operators’ expertise". Also, there were some issues in need of improvement in three aspects. First, there were issues with “Complexity of certification procedure”, “Lack of competent professionals”, “Lack of support costs for project planning”, and “Administrative delay” in system and operation. Second, there were issues with “Concern about transaction possibilities” in profitability. Third, there were issues with “Lack of project operators’ expertise”, “Gap between business purpose and expectation” in participants’ characteristics and perception.
This study proposed "Providing guidelines and information on the project through periodic identification of the people in charge", "Emphasizing awareness as a project for social contribution", and "Encouragement of revenue generation from non-carbon revenue sources" for improvement of scheme. Keywords: Policies, Climate change, Sustainable forest management ID: 3486756
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