Soil Science and Ecology Department, Faculty of Forestry, Istanbul University-Cerrahpaşa, Bahçeköy Merkez, Orman Fakültesi No. 2, 34473, Sarıyer, Istanbul, Turkey.
Environ Monit Assess. 2021 May 5;193(6):327. doi: 10.1007/s10661-021-09100-3.
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 (R = 0.8) than stone pine (R = 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.
在土耳其伊斯坦布尔-杜鲁苏（特克诺斯），对种植 60 年后的引入石松（Pinus pinea L.）和海松（Pinus pinaster Aiton）林分进行了采样。在四个不同的发育阶段（林分中 1.3 米高处树木的平均直径（DBH）：SDF = < 8 cm、MDF = 8-20 cm、LDF = 20-36 cm 和 UDF > 36 cm）对采样进行了取样，每个物种和发育阶段有 15 个重复样地，总共有 120 个样地。在每个样地中，森林地表进行了 5 次重复采样。森林地表样品分为两层：L + F（凋落物 + 发酵）和 H（腐殖质），并测定了其烘干质量和氮（N）含量。结果表明，尽管石松林中腐殖质层的质量没有显著差异，但在发育阶段之间，总森林地表和两个层的质量有显著差异，海松林的质量呈上升趋势。然而，总森林地表的积累量随着发育阶段的增加而显著增加（石松 28-60 t/ha，海松 17-64 t/ha）。在这两个物种中，森林地表层的 N 浓度在发育阶段之间存在显著差异，L + F 层的 N 浓度随着发育阶段的增加而增加，而 H 层则呈现波动趋势。尽管石松林中腐殖质层的 N 含量在发育阶段之间没有显著差异，但在海松林中，总森林地表的 N 含量为 0.1-0.5 t/ha，而在石松林中为 0.2-0.5 t/ha。确定林分中平均林分 DBH 与总森林地表 N 储量之间的关系，发现海松林中的相关性更高（R = 0.8），而石松林中的相关性较低（R = 0.4）。总之，不同树种引入的林分中森林地表的 N 浓度和 N 含量差异显著，表明森林地表 N 的积累。
