THE GROWING SPACE UTILIZATION OF MAIN TREE SPECIES IN NORTHERN TURKEY

ABSTRACT Relationships between tree size and density are important to define the growing space utilization in a stand. Although a universal slope for the maximum size-density relationships (MSDRs) has been previously suggested, recent research have highlighted 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, MSDRs have not been developed for these tree species in northern Turkey. In this study, average maximum density (DAM) slopes for these tree species were determined. Results suggested that MSDRs varied among the species, and that their slope differed from the universal slope of -1.605. The MSDRs described in this study are useful for managing stand density in natural stands of the species analyzed.

摘要 林木大小与密度的关系对于明确林分的生长空间利用效率至关重要。尽管此前已有研究提出最大大小-密度关系（maximum size-density relationships, MSDRs）存在通用斜率，但近期研究表明此类关系具有物种特异性。东方山毛榉（Fagus orientalis Lipsky）、特洛伊冷杉（Abies nordmanniana subsp. equi-trojani）、黑松（Pinus nigra Arnold）与欧洲赤松（Pinus sylvestris L.）具备不同的冠层结构、生长速率及耐荫性，但此前尚未针对土耳其北部的这些树种构建最大大小-密度关系模型。本研究测定了上述树种的平均最大密度（average maximum density, DAM）斜率。结果显示，不同树种的最大大小-密度关系存在显著差异，其斜率与通用斜率-1.605并不一致。本研究构建的最大大小-密度关系模型，可为所分析树种的天然林分密度管理提供有效参考。