| Abstrakt: |
The objective of the research consisted in the analysis of the qualitative parameters of 380 lots of seeds of sycamore maple (Acer pseudoplatanus L.) originated from all over Romania, in the last 21 years (2003-2023). In the context of global warming, the influence of the main climatic factors (air temperature and atmospheric precipitations) on the qualitative parameters of the seeds of sycamore maple was studied for two leading counties regarding the tested seed lots, Caraș-Severin and Sibiu. The research was carried out in the forest seed testing laboratory of the INCDS "Marin Drăcea" Brașov Station. All laboratory analyses, carried out between 2003 and 2023, were made in according with the international rules established by ISTA and implemented in Romania by SR 1908/2004 standard. Average values for purity (94.4%), viability (72.9%) and mass of 1000 seeds (130.5 g) were obtained for the 380 analysed lots of sycamore maple seeds which places them in the 2nd class of quality, very close to the thresholds of the first class, where 40% of the lots are included. The highest values of seed viability were recorded in 2008, 2011 and 2012, and the leading counties were Mureș, Buzău and Timiș. Positive and highly significant correlations were obtained among the main qualitative traits of the seeds as well as a multiple correlation, also positive and highly significant, between purity, viability and mass of 1000 seeds. Heavier and higher purity seeds will have better viability. In both analysed counties (Sibiu and Caraș-Severin), regarding the influence of climatic factors on the seed’s quality parameters, in the year in which the highest temperature was recorded, and fell among the lowest amounts of precipitation (year 2019), a very low values for seeds viability were obtained (penultimate place, in Sibiu, and 15th out of 20, in Caraș-Severin). The obtained results indicate a possible risk of reducing the viability of the sycamore maple seeds in the future, in the context of climate warming, with negative effects on the existence of this important mixed species in the Romanian forests. [ABSTRACT FROM AUTHOR] |
