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Relationships between tree size and tree spatial density is important to define the growing space utilization in a stand. Although a universal slope for the size-density relationships was previously recommended, recent literature studies have revealed that these relationships are species-specific. Oriental beech (Fagus orientalis Lipsky), Trojan fir (Abies nordmanniana subsp.equi-trojani), black pine (Pinus nigra Arnold) and Scots pine (Pinus sylvestris L.) represent different crown architecture, growth rate and shade tolerance; however, the size-density relationships have not been developed for these tree species in northern Turkey. Thus, in this study, average maximum density (DAM) slopes for these tree species were determined. Published approaches and models from the literature were utilized to describe the species-specific size-density relationships. The data suggested that the size-density relationships varied among the species, and the slope of the size-density relationships differed from the universal slope of -1.605. The maximum size-density relationships described in this study will be useful for managing stand density in Oriental beech, Trojan fir, black pine and Scots pine forests.