Introduced stone pine (Pinus pinea L.) and maritime pine (Pinus pinaster Aiton) stands were sampled 60 years after plantation in Istanbul-Durusu (Terkos), Turkey. Sampling was conducted at four different developmental stages (mean diameter of trees at 1.3-m height (DBH) in stands: SDF = < 8 cm, MDF = 8–20 cm, LDF = 20–36 cm, and UDF > 36 cm), with 15 replicated sample plots for each species and developmental stage, for a total of 120 sample plots. The forest floor was sampled in 5 replications in each sample plot. The forest floor samples were divided into two layers: L + F (litter + fermentation) and H (humus), and the oven dry mass and nitrogen (N) content were determined. As a result, the masses of the total forest floor and of both layers were significantly different among the development stages with an increasing trend in maritime pine stands despite no significant difference found in the mass of the humus layer in stone pine stands. However, total forest floor accumulation significantly increased with the development stage (28–60 t/ha in stone pine and 17–64 t/ha in maritime pine). In both species, the N concentrations in the forest floor layers differed significantly among the development stages, and the N concentrations tended to increase as the development stage increased in the L + F layer, whereas a fluctuating trend was observed in the H layer. Although the N content of the humus layer of stone pine did not show a significant difference among the development stages, the N content in the total forest floor was determined to be 0.1–0.5 t/ha in maritime pine and 0.2–0.5 t/ha in stone pine. The relationship between the mean stand DBH and the N stock of the total forest floor was determined to have a higher correlation in maritime pine (R² = 0.8) than stone pine (R² = 0.4). In conclusion, the nitrogen concentrations and nitrogen contents of the forest floor were remarkably different in stands introduced with different tree species, indicating the accumulation of forest floor nitrogen.

推出石松（Pinus pinea L.）和海洋松（Pinus pinaster）在土耳其的伊斯坦布尔-杜鲁苏（Terkos）种植60年后对Aiton的林分进行了采样。在四个不同的发育阶段进行采样（林分中1.3米高（DBH）的树​​木的平均直径：SDF = <8 cm，MDF = 8–20 cm，LDF = 20–36 cm，UDF> 36 cm） ，每个物种和发育阶段都有15个重复的样地，总共有120个样地。在每个样地中，对林地进行了5次重复采样。将林地样品分为两层：L + F（凋落物+发酵）和H（腐殖质），并确定烤箱的干燥质量和氮（N）含量。因此，在发展阶段之间，森林总层和两层的质量都存在显着差异，海洋松林的数量呈增加趋势，尽管石松林的腐殖质层的质量没有显着差异。然而，随着开发阶段的发展，森林总地面蓄积量显着增加（石松为28-60吨/公顷，海松为17-64吨/公顷）。在这两个物种中，林木层中的氮浓度在发育阶段之间存在显着差异，并且随着发育阶段的增加，L + F层中的氮浓度趋于增加，而在H层中则观察到波动趋势。尽管石松腐殖质层的氮含量在发育阶段之间没有显着差异，测得海松中总森林地层的氮含量为0.1-0.5吨/公顷，石松中的氮含量为0.2-0.5吨/公顷。确定了平均林分DBH与总森林地面N储量之间的关系在海松中具有较高的相关性（R ²  = 0.8）比松石（R ²  = 0.4）。综上所述，在引入不同树种的林分中，林地的氮含量和氮含量存在显着差异，表明林地中氮的积累。