EGE 12TH INTERNATIONAL CONFERENCE ON APPLIED SCIENCES
PINUS NIGRA GROWTH DYNAMICS MODULATED BY COMPETITION AND CLIMATE VARIABILITY
Yazarlar:
Edmond PASHO
Arben Q. ALLA
Leonard LLESHI
Yayıncı:
Academy Global Publishing House
This study aimed at evaluating tree growth variability and the influence of climatic factors and competition on a Pinus nigra plantation located in north Albania. Field sampling consisted of dendrometric measurements (diameter at breast height (dbh), height, crown radius (CR)) and radial growth samples (earlywood (EW), latewood (LW), tree-ring width (TRW); the latter were measured and analysed using dendrochronological methods. Prior to the analysis, trees were classified in two classes (dominant trees (DT) and supressed trees (ST)) based on the social status. ANOVA was used to compare growth of trees within the study area and between social classes whereas linear regression analysis was employed to assess the relationship of growth variables with Hegyi competition index. Pearson correlation analysis was performed to evaluate the association among radial growth components, as well as the impact of climate on radial growth variability. Growth variables were statistically different between the social classes. Radial growth components showed higher values in social class DT as compared to the ST social class. Hegyi index showed significant negative correlation with growth variables (TRW, dbh, CR) when all trees were considered but varied when trees were grouped based on the social status. In the social class DT, EW growth was positively/negatively affected by summer precipitation/temperature whereas LW growth was positively associated with precipitation (march, summer and total) and negatively with summer temperatures. TRW showed positive relationship with precipitation in May, June and July, and negative association with August temperature. In the social class ST, EW growth showed positive and significant relationship with August precipitation and negative association with temperatures in August and September of the previous year and August of the current year. LW demonstrated positive association with summer precipitation and negative correlation with previous September, current March, July and August temperatures. TRW presented positive relationship with summer and December precipitation whereas previous September and current July and August temperatures negatively affected TRW. Findings of this study serve as a basis to identify the most appropriate strategies to mitigate the impacts of climate change on growth of this species
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