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Variability in the early growth of Parkia timoriana (DC.) Merr. from Mount Makiling Forest Reserve, Luzon, Philippines and its applications in conservation and forest restoration

XV World Forestry Congress, 2-6 May 2022










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    The effects of light, water and nutrient availability on the interspecific and intraspecific competition of Heracleum moellendorffii and Adenophora divaricata
    XV World Forestry Congress, 2-6 May 2022
    2022
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    Since it takes at least 50 years to harvest timber after reforestation in temperate forests, foresters are very interested in cultivating wild vegetables in the forest. In the forests of South Korea, the slope varies greatly, and the amount of light, moisture, and soil nutrients available to wild vegetables differ depending on whether thinning is performed. Therefore, it is necessary to study the response of wild vegetables in these environments.
    In this study, we tried to find a suitable growth environment while examining the effects of inter- and intraspecific competition on wild vegetables. To investigate the inter- and intraspecific competitive effects, H. moellendorffii and A. divaricata were planted in two ways. For the competitive effect of resource availability, shading, irrigation, and fertilization treatment was performed. And we measured the height, root collar diameter, leaf specific weight, biomass, and relative yield.
    As a result, shade significantly increased the height growth of H. moellendorffii regardless of planting methods, particularly those grown in high soil moisture and nutrients. Contrarily, the aboveground biomass of A. divaricata was significantly suppressed by shading, particularly when planted with the other species without fertilizer. When planted together, the interspecific competitiveness of H. moellendorffii tended to be stronger than that of A. divaricata across light conditions. The amount of light, soil moisture, and nutrients and their interactions have been shown to significantly affect the growth of the seedlings, resulting in asymmetric interspecific competition between species. The findings of the present study should provide us with a better understanding of the environmental factors affecting plant growth that are necessary to make forest farming in the understory more ecologically and socio-economically feasible and appealing. Keywords; Human health and well-being, Agriculture, Research, Economic Development ID: 3621831
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    The early growth performances of Pinus densiflora and Larix kaempferi seedlings under open-field experimental warming and precipitation manipulation
    XV World Forestry Congress, 2-6 May 2022
    2022
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    This study aimed to investigate the effects of climate change on the survival and growth performance of Pinus densiflora and Larix kaempferi seedlings using open-field experimental warming and precipitation manipulation. We measured the survival rate, root-collar diameter, and height, and then calculated the seedling quality index (SQI) of 2-year-old seedlings under 6 treatments [2 temperatures (TC: Control; TW: Warming) × 3 precipitation manipulations (PC: Control; PD: Decreased; PI: Increased)] and performed a two-way ANOVA to test for differences. The air temperature of the warming plots was 3°C higher than that of the control plots, while the precipitation manipulation plots received ±40% of the precipitation received by the control plots. Temperature and precipitation treatments did not significantly affect the survival rate of P. densiflora; however, the SQI of P. densiflora decreased with increasing precipitation. In contrast, the mortality rate of L. kaempferi increased with increasing temperature and decreasing precipitation. Furthermore, in L. kaempferi, TC × PI treatment resulted in the lowest SQI with a significant interaction effect observed between the two factors. In summary, low seedling production and quality should be expected in P. densiflora as precipitation increases and in L. kaempferi as temperature increases or precipitation decreases. These results indicate species-specific sensitivities to climate change of two plant species at the nursery stage. With the occurrence of global warming, the frequencies of drought and heavy rainfall events are increased, and this could affect the survival and seedling quality of tree species. Therefore, it is necessary to improve nursery techniques by establishing new adaptation strategies based on species-specific growth performance responses. 1) Keywords: Climate change ID: 3622385
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    Propagation and growth from seeds and root segment cuttings of fruit tree-plus Diospyros mespiliformis (Ebenaceae) in Benin West Africa
    XV World Forestry Congress, 2-6 May 2022
    2022
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    The aim of the present experiment was to assess effectiveness of selected propagation methods, early nursery and field performance of D. mespiliformis (Ebenaceae). For instance, effects of seed pretreatment/root segment cuttings diameter, provenance and soil types on germination and growth vigor of the species was investigated using 144 seeds/root segment; laid in 500 g of three different soil types and soaked/planted in polyethylene bags replicated four times in three treatments and laid in 4×3×3 factorial Completely Randomized Design. Emergence of radicle (days), Seedlings/Shoot Height (cm), number of leaves, and Percentage survival were recorded two weekly for a period of 7 months. Time to event seed germination/shooting data analysis, ANOVA two ways and Generalized Mixed effects Model were used to assess effects of origin, pre treatment/diameter and soil types on germination, shooting and growth of Diospyros mespiliformis. Results indicated that propagation of the species can best be done through seeds and root cuttings. The essay revealed that seeds from woodland, savannah and parkland, sowed in compost and clay and pre treated (boiled water, tegument removed) had the highest germination percentage (69.9-86.67 %), while seeds in the control (no treatment, Inundated Forest and sandy) had very low germination of 17-35 %. No seed treatment showed deficiency in the survival and germination of the seeds of Diospyros mespiliformis, while borehole water aided the survival and bring back early (rapid) germination. Regarding RSC, leafy shoots formed percentage varied from 0 % in river sand to 64.6% in clay and compost substrate after 12 weeks. Results reveal also that among the three classes of diameter, shooting height decreases from clay to sandy while the same variable move in inverse order regarding RSC origin. Keywords: Adaptive and integrated management, Biodiversity conservation, Genetic resources, Research, Sustainable forest management ID: 3477094

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