Template-Type: ReDIF-Article 1.0 Author-Name: Alexandra Porcsin Author-Workplace-Name: Faculty of Forestry, Institute of Natural Resources and Forest Management, University of Sopron, Sopron, Hungary Author-Name: Tamás Ábri Author-Workplace-Name: Department of Plantation Forestry, Forest Research Institute, University of Sopron, Püspökladány, Hungary Author-Name: Helga Déri Author-Workplace-Name: Department of Apiculture and Bee Biology, Institute for Farm Animal Gene Conservation, Gödöllő, Hungary Author-Name: Edit Zajácz Author-Workplace-Name: Department of Apiculture and Bee Biology, Institute for Farm Animal Gene Conservation, Gödöllő, Hungary Author-Name: Bence Bolla Author-Workplace-Name: Department of Forest Ecology, Forest Research Institute, University of Sopron, Budapest, Hungary Author-Name: Katalin Szakálosné Mátyás Author-Workplace-Name: Faculty of Forestry, Institute of Natural Resources and Forest Management, University of Sopron, Sopron, Hungary Author-Name: Károly Rédei Author-Workplace-Name: Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary Author-Name: Zsolt Keserű Author-Workplace-Name: Department of Plantation Forestry, Forest Research Institute, University of Sopron, Püspökladány, Hungary Title: Soil temperature and weather factors as key drivers of flowering phenology and nectar production in black locust (Robinia pseudoacacia L.) in Hungary Abstract: The black locust (Robinia pseudoacacia L.) is the second most planted tree species worldwide, and the most common in Hungary. Phenotypic traits, particularly flowering patterns, are well-established indicators of the species' response to climate change. This study examined four forest subcompartments across three Hungarian regions: Northern-Central, Eastern and Southern-Central. The aim was to identify climatic factors correlating with the onset and duration of the flowering period. Additionally, the relationships between these factors and nectar weight and sugar concentration were defined. Results indicate a strong negative correlation between precipitation levels and flowering time: lower accumulated and average precipitation during the spring months of the preceding year was associated with a delayed flowering period in the following year (r = -0.922, r = -0.918, P = 0.05). However, when examining the 14-day period (r = 0.829) before blooming or examining from 1 January (r = 0.929, r = 0.890), the results indicate that other environmental factors may play a more dominant role. Furthermore, the number of chill and heat days was found to affect the starting date (R2 = 0.819, R2 = 0.765). Keywords: apiculture, cultivars, flowering date, phenological plasticity, weather factors Journal: Journal of Forest Science Number: 47714 Volume: preprint DOI: 10.17221/6/2026-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/6/2026-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-000004-7714.txt Handle: RePEc:caa:jnljfs:v:preprint:id:6-2026-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Kritsadapan Palakit Author-Workplace-Name: Department of Forest Management, Faculty of Forestry, Kasetsart University, Bangkok, Thailand Author-Name: Khwanchai Duangsathaporn Author-Workplace-Name: Department of Forest Management, Faculty of Forestry, Kasetsart University, Bangkok, Thailand Author-Name: Nathsuda Pumijumnong Author-Workplace-Name: Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom, Thailand Author-Name: Supasit Sriarkarin Author-Workplace-Name: Department of Forest Management, Faculty of Forestry, Kasetsart University, Bangkok, Thailand Author-Name: Thanyaporn Bungbai Author-Workplace-Name: Department of Forest Management, Faculty of Forestry, Kasetsart University, Bangkok, Thailand Author-Name: Pichit Lumyai Author-Workplace-Name: Department of Forest Management, Faculty of Forestry, Kasetsart University, Bangkok, Thailand Title: Tree-ring based climate reconstruction and growth-climate analysis of Pinus kesiya Royle ex Gordon in Doi Khuntan National Park, northern Thailand Abstract: Tree-ring analysis is a valuable tool for understanding long-term climate patterns and their influence on tree growth. This study investigates the climate-growth relationships of Khasi pine (Pinus kesiya Royle ex Gordon) in Doi Khuntan National Park, northern Thailand (at elevations of 850 to 1 035 m a.s.l.), to reconstruct past climate and inform forest management. Using 48 cross-dated increment cores, we developed an 83-year chronology (1936-2018). Standard dendrochronological methods and regression models were applied. The radial growth of P. kesiya was primarily influenced by moisture availability, showing significant positive correlations with March rainfall (r = 0.39, P < 0.01) and April-July relative humidity (r = 0.45, P < 0.01). Growth was negatively correlated with April-July mean temperature (r = -0.47, P < 0.01), indicating that warmer wet seasons induce stress. False-rings served as complementary intra-annual drought proxies, linked to cool-dry transitional periods. Multiple regression models explained 40.6% of radial growth variance and 65.6% of false-ring frequency variance. Reconstructed climate series revealed significant warming trends since the 1930s, most pronounced in April extreme minimum temperature, which increased by +0.98 °C over the study period (Mann-Kendall test, P < 0.01). These findings highlight the vulnerability of montane pine forests to increasing temperatures and atmospheric dryness, providing a multi-proxy baseline for climate change adaptation. Keywords: dendrochronology, false ring, intra-annual ring, Khasi pine, montane forest Journal: Journal of Forest Science Number: 47066 Volume: preprint DOI: 10.17221/78/2025-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/78/2025-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-000004-7066.txt Handle: RePEc:caa:jnljfs:v:preprint:id:78-2025-JFS