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Hardwood forest stands in Latvia serves mainly recreational purposes, as well as ensuring biological diversity. Ash stands in 2015 were occupied 0.4% of the total (2923515 ha) forest area. This proportion have been made up from the dominant tree species registered in the State Forest Register. The research was conducted in the pure and mixed stands (other species admixture up to 30%), selecting middle-age (44, 47 years) and mature (66, 67 years) stands with a density of 0.7. For data collection, were installed 16 ...