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Development of country specific emission factors for reporting GHG inventory in the forestry sector

XV World Forestry Congress, 2-6 May 2022










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    Evaluation of carbon stocks of domestic wood products to improve carbon sinks in the forest sector
    XV World Forestry Congress, 2-6 May 2022
    2022
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    Harvested Wood Products (HWP) is recognized as a carbon pool in the forest sector, along with biomass, dead wood, litter and soil. There was a debate about which country should include carbon stocks in imported or exported HWP. At the 17th Conference of the Parties in Durban (COP17) in 2011, domestic harvested wood products were accepted as accounted carbon pools and thus have to be reported by all Parties included in Annex I. Although the HWP carbon calculation method related to this has been suggested since the IPCC 2006 guidelines, it could not be calculated due to the lack of HWP statistics data in Korea.
    In this study, to estimate the carbon stock and the annual stock changes for each of the HWP categories. Input data on the production of wood products used in the model to estimate carbon emissions and removals from HWP in Korea were acquired from database of the 'Wood utilization survey report' and 'Statistical yearbook of Forestry' in Korea Forest Service. In particular, statistic data on production of sawnwood, wood-based panels and paper and paperboard were obtained for the period 1989–2019. It used the first order decay function with default half-lives of 35, 25 and two years, respectively. For the conversion of wood volume or weight into carbon the default conversion factors and half-lives provided by IPCC guideline. As a result of the calculation, it was estimated that about 0.7 million tCO2 was stored according to the use of domestic wood products in 2019. It is expected that it will be possible to quantify the carbon storage effect of HWP and to activate the use of wood products. Indeed, it could change if life expectancy of HWPs improves into the future. Furthermore, additional mitigation potential may be achieved when substituting emissions-intensive materials. Keywords: Sustainable forest management, Climate change, Value chain ID: 3619351
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    Article
    The influence of over-mature, degraded Nothofagus forests with strong anthropic disturbance on the quality of an andisol and Its gradual recovery with silvopasture in southwestern South America
    XV World Forestry Congress, 2-6 May 2022
    2022
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    The increasing demand for timber and non-timber products from native forests in Chile and the cattle grazing has augmented the rate of degradation of these ecosystems. This process results in the need to know which of the dynamic variables are involved in its regulation. Soil quality indicators like soil organic carbon (SOC), soil microbial respiration (SMR), microbial biomass carbon (MBC), potential net N mineralization (N-min), and nitrification (N-NO), soil aggregates, and light fraction (LF), were evaluated at two different depths of the soil in Nothofagus obliqua (deciduous) and mixed N. dombeyi - N. obliqua (evergreen-deciduous) forests, where a 30- ha silvopastoral trial was established, after this evaluation, in early 2016. The SOC, SMR, MBC, N-min and N-NO were significantly higher in the N. obliqua forest than the mixed forest, 8%, 17%, 17%, 40%, 20%, respectively (p<0.05). The dry weight in soil fractions did not present differences between forest types. C and N contents in the LF (labile, un-decomposed organic matter of plant origin) were higher in the deciduous forest, 9% and 20%, respectively (p<0.05). Our results suggest that soil quality was favored by the quality of organic matter in the site dominated by deciduous species, which translates into more favorable conditions for the activity of microorganisms, nitrogen dynamic, and C and N content in the light faction. The intrinsic characteristics of the plant residues associated with higher rates of decomposition, can stimulate the activity of the biota and especially the soil microorganisms, which would lead to higher values of the different indicators evaluated. This novel silvopastoral system will likely help restore the most degraded sites through improvement of the soil quality. This kind of information allows obtaining knowledge of the forest areas and their sustainability, mainly for the planning of long-term, durable silvopastoral practices. Keywords: Forest degradation, Nothofagus obliqua, N. dombeyi, silvopastoral systems, Temperate Forest, Volcanic soil ID:3484562
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    Article
    Overstory-regeneration relationships in mixed-conifer forests of the southwestern United States
    XV World Forestry Congress, 2-6 May 2022
    2022
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    The ponderosa pine, dry- and wet-mixed conifers, and spruce-fir forests are major forest types in the southwestern United States. The ponderosa pine and dry mixed-conifer systems have historically relied on fire to maintain structure and composition. With the changes in fire regimes, there has been a long-term progression toward more shade-tolerant species such as Abies concolor. Using data from the USDA Forest Service Forest Inventory and Analysis program, this study focused on the relative proportions of each species in the seedling, sapling, and overstory tree cohorts. The hypothesis is that regeneration and subsequent development by species were proportional to the species in the overstory, accounting for shade tolerance. Transitions to a different future forest combination, if that transition was occurring, was related to the time since the previous disturbance, usually fire, and the relative proportion of Abies in the overstory mix. This paper examines a subset of the relationship between overstory basal area, latitude, elevation, and seedling numbers in the understory by species. We found three species – Picea engelmannii, Pseudotsuga menziesii, and Pinus ponderosa – displayed an interaction between overstory basal area and latitude upon seedling numbers in the understory. There was little separation at the more southerly locations, suggesting an external limiting factor, soil moisture availability, overcame species-specific silvical characteristics and competitive abilities. Future work will examine the presence of particular species in the overstory and their influence upon their own and other species' regeneration. Keywords: multiple species forests, regeneration trends, succession, microenvironment ID: 3486970

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