Understanding variations in soil humus and fine root properties in Oriental beech (Fagus orientalis L.) stand in response to development stages in temperate Hyrcanian forests is essential for sustainable forest management. The development stages of beech stand (initial, optimal and decay) were determined, and three plots of 100 × 100 m (1 ha) were chosen at each development stage. Five subplots in size 20 × 20 m were randomly selected at plots of 1 ha. The concentrations of humus elements (C, P, K, Mg, Fe and Zn) differed significantly among the development stages in spring and autumn seasons within Beech forest. The comparison of mean chemical compounds of humus layer in spring and autumn seasons using t test showed significant difference for each the development stage. Differences in C, N and P concentrations and also C/N and N/P ratios in fine roots of beech trees were significant among development stages, while C/P ratio was insignificant. The mean values of N and P for initial stage were higher, but C and N/P ratio were higher for optimal stage. The highest C/N value was observed in decay stage. There were statistically significant effects of development stages on fine root biomass and morphology traits at different diameter classes in beech trees. No statistically significant impacts of development stages were observed on fine root morphology of beech trees, except for fine root density. Our results reveal the important role that different development stages may play in Beech forest regarding variations in chemical properties of fine roots and soil humus.

为了适应可持续森林管理，了解温带Hycanian森林中东方山毛榉（Fabus Orientalis L.）林分中土壤腐殖质和细根特性的变化是必要的。确定了山毛榉林的发育阶段（初始，最佳和衰减），并在每个发育阶段选择了三个100×100 m（1公顷）的样地。在1公顷的土地上随机选择了20个20 m大小的五个子图。在春季和秋季的山毛榉森林中，腐殖质元素（C，P，K，Mg，Fe和Zn）的浓度差异显着。春季和秋季腐殖质层平均化学成分的t值比较。测试显示每个开发阶段都有显着差异。在整个发育阶段，山毛榉树细根中的C，N和P浓度以及C / N和N / P比值之间的差异显着，而C / P比则不明显。初始阶段的N和P平均值较高，而最佳阶段的C和N / P比较高。在衰减阶段观察到最高的C / N值。在不同直径类别的山毛榉树中，发育阶段对细根生物量和形态性状有统计学意义的影响。除细密的根部密度外，未观察到发育阶段对山毛榉的细根形态有统计学意义的影响。