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DocumentSpatial distributions pattern and associations of dead woods in natural spruce-fir secondary forests
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Natural secondary forest is the main part of forest resources in China. Studying dead woods (DW) could better reveal the community succession rule and promote the healthy development of them. We investigated basic characteristics and coordinates of each tree (DBH≥1 cm) within a plot (100 m×100 m) using the adjacent grid method and studied the spatial distributions pattern and associations of DW (in the last five years) in a typical natural spruce-fir secondary forest in Jingouling Forest Farm, Wangqing Forestry Bureau, Jilin Province, China. The results showed that the diameter class distribution of DW showed the pattern of left-single-peak curve, while the logs showed the pattern of multi-peak curve. DW number was related to the mixing degree of one species, but not to the total number of it. The distribution of DW was concentrated at 0~8m scale. As the scale increases, it changed to random or uniform. The aggregation distribution of DW of medium (10 cm≤DBH<20 cm) and small (1 cm≤DBH<10 cm) DBH at small scale below 8 m was the main reason for the aggregation distribution of DW. The DW of large (DBH≧20 cm) DBH and Saplings (1 cm≤DBH<5 cm) showed a significant positive association at 2~25 m scale. There was no significant spatial association between DW and Small trees(5 cm≤DBH<15 cm). At 0~3m scale, there was a positive association between Medium trees (15 cm≤DBH<25 cm) and DW of small and medium DBH. At the 9 m, 11~14 m scale and the 15 m, 42~45 m scale, the DW of small and medium DBH were significantly negatively associated with Large trees (DBH≥25 cm). In conclusion, the biological traits, diameter class distribution and spatial distribution affected the abundance and diameter class distribution of DW of one species. The spatial distributions of DW and the associations between DW and standing trees varied across diameter classes and scales. Rational utilization of spatial information could optimize stand structure and promote positive community succession. Keywords: Deforestation and forest degradation, Sustainable forest management, Adaptive and integrated management ID: 3618474 -
ArticlePlant diversity and regeneration potential in forest protected areas of Sierra Leone
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Protected areas (PAs) around the globe are considered a reservoir for biodiversity conservation and an engine for ecosystem function and services. The regeneration potential of tropical forests in Protected Areas (PAs) is crucial to plant diversity and conservation, amid climate change uncertainties in the 21st century. The current status and future sustainability of PAs in Sierra Leone is uncertain and may lead to the risk of species extinction in the near future. To close this gap, we assessed the seedlings, saplings, and trees species diversity, abundance, richness and regeneration status of four PAs across Sierra Leone. We sampled 60 quadrats in total with each having a dimension of 20m × 20m. We found only a few new species with good regeneration potential in all the forest PAs we assessed, indicating that the resilience of these forests are quite low in the face of degradation. Plant diversity index and soil factors were positively correlated, indicating that a decrease or increase in soil physical and chemical properties could affect speciation. The diameter class distribution shows that the majority of plant sizes fall within the 0-30cm category. The plant species with the highest importance value index (IVI) were Uapaca guinensis (34.71), Heritiera utilis, (37.93), Guibourtia. copallifera (115.50) and Phyllocosmus africana (37.24) respectively. The results showed that the plant diversity status of forest PAs in Sierra Leone is at a crossroad. It recommended that strategic planning and forest enrichment policies be put in place to mitigate future forest exploitation. Keywords: Protected areas, Regeneration, Sierra Leone, Flora biodiversity, Seedlings, Saplings ID: 3471646 -
DocumentVariability 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
2022Also available in:
No results found.This study evaluated the early growth performance of selected mother trees of Parkia timoriana (Fabaceae) and characterized the suitable environmental (soil and light) factors for the growth of the species. P. timoriana seedlings from different mother trees from the Mount Makiling Forest Reserve (MMFR), Luzon, Philippines were grown in two soil media under greenhouse condition and field trial planted in the University of the Philippines Laguna-Quezon Land Grant (LQLG), where P. timoriana is not occurring naturally and soil and climate differ significantly with the MMFR. Early growth performances in height and ground basal diameter (GBD) or root collar diameter (RCD) both in the greenhouse and field trial plot were measured. Nursery-based performance showed that the average RCD was generally higher in MMFR than LQLG soil but the overall difference was not statistically significant. In contrast, overall average height was consistently higher in LQLG than in MMFR soil, but similar to RCD the difference was not statistically significant. Under different light conditions in the field trial, there was significant difference in mortality, tree height, and GBD. The differences in both the height and GBD may be attributed to the genotype of the mother trees, but height can additionally be attributed to the interaction of the genotype and the different light conditions. Results suggest that P. timoriana can be grown in areas of different soil condition, but it requires partial shade in order to achieve its full growth potential during the early stage of its growth. Hence, P. timoriana when used in reforestation or tree planting projects must consider differences in the early growth response of seedlings according to its genotype as well as light conditions. However, it is highly suggested that growth performances among provenances of P. timoriana and other environmental variables that may affect growth of the species should be looked into. Keywords: Biodiversity conservation, Genetic resources, Sustainable forest management, Deforestation and forest degradation, Monitoring and data collection ID: 3486623
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