Englіsh oak populatіon varіabіlіty by growth and stem qualіty іn 30-year-old provenance trіal plantatіons
Journal Title: Лісівництво і агролісомеліорація - Year 2015, Vol 127, Issue
Abstract
The growth and quality indicators were analyzed for oak provenance trial plantations created in 1975-1977 in Trostjanets Forest Department in Sumy region. The evaluation of the current state of experimental plots was carried out. It was determined that, in the Left-bank Forest-Steppe of Ukraine, the 30-years-old provenances from Transcarpathian (t = 4.04), Voronezh (t = 3.05) and Rivne (t = 2.01) regions have significantly better average height indices while the provenances from Volgograd region (t = -4.57) and the Republic of Bashkortostan (t = -4.21) have significantly worse ones. By the indices of average diameter, the progenies of the eastern population were significantly higher than the oak of local origin – provenance from the Volgograd region (t = 3.71), Rivne, Transcarpathian and Mohilev regions (t = 2.26). The provenances from Mohilev, Transcarpathian and Belgorod regions which exceed the stock volume of homegrown oak by 30-50 % were the most productive in the trials. The variations from the Volgograd Region and the Republic of Bashkortostan were revealed as low productive in test. Analysis of the qualitative structure of population progenies indicates the high stem quality for provenances of western Ukrainian origin and for the most of provenances from Central Black Earth region of Russia and Belarus, the percentage of strong stems of which is ranged from 60 % to 90 %. The provenances from the east (the Volgograd Region and the Republic of Bashkortostan) and south (the Luhansk and Kirovohrad regions and the Crimea) were revealed as low quality in provenance trial. Percent of strong trunks in the provenance trials ranges from 15 % to 40 %.
Authors and Affiliations
V. Samoday
Keywords
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