Ulus Vocational School, Department of Forestry, Bartın University, 74600, Ulus, Bartın, Turkey.
Aegean Forestry Research Institute, 35515, Urla, İzmir, Turkey.
Environ Monit Assess. 2023 Sep 11;195(10):1181. doi: 10.1007/s10661-023-11778-6.
Determining the nutrient stocks and revealing the extent to which these stocks will be affected by the interventions in forest ecosystems are crucial for sustainable forest management. This study aimed to determine the nutrient stock of cedar (Cedrus libani A. Rich.) plantations at different stands with various diameter classes and estimate the nutrient stock to be removed from the forest due to harvesting. Soil and plant samples were collected from 40 plots in Eskişehir and Afyonkarahisar provinces in Turkey. The variation in the nutrient concentrations and stocks of different components of the ecosystem were evaluated by analysis of variance and the decrease via harvesting by regression analysis. The results showed that the concentrations of N, P, K, Mg, S, Fe, Zn, and Mn were highest in the needles, Ca in the bark, Cu in the needles, dead branches, and root. In the large-diameter forest (LDF), dbh=20.0-35.9 cm, the highest P stock was found in the trees, Fe stock in the forest floor, and S stock in the soil and trees. As a result, the forest floor should be protected as it is the crucial component of both the nutrient cycle and the Fe stock in the ecosystem. In LDF, 28.4-37.3% of the nutrient stored in the trees would be removed from the ecosystem in the case of moderate thinning with whole-tree harvesting, while only 5.9-14.1% of the nutrient stock in the case of stem-only harvesting. For these reasons, leaving logging residues after harvesting in the forest would minimize nutrient loss. The study results showed that improved nutrient management in a forest ecosystem will make a significant contribution to the sustainability of forests.
确定养分储量，并揭示这些储量将在多大程度上受到森林生态系统干预的影响，对于可持续森林管理至关重要。本研究旨在确定不同林分和不同直径类别的雪松（Cedrus libani A. Rich.）人工林的养分储量，并估计由于采伐而从森林中去除的养分储量。在土耳其埃斯基谢希尔省和阿菲永卡拉希萨尔省的 40 个地块中采集了土壤和植物样本。通过方差分析评估了不同生态系统组成部分的养分浓度和储量的变化，通过回归分析评估了由于收获而导致的减少量。结果表明，氮、磷、钾、镁、硫、铁、锌和锰在针叶中的浓度最高，钙在树皮中，铜在针叶、枯枝和根中。在大直径林（LDF）中，dbh=20.0-35.9cm，树木中发现的 P 储量最高，林地中的 Fe 储量最高，土壤和树木中的 S 储量最高。因此，应该保护林地，因为它是养分循环和生态系统中 Fe 储量的关键组成部分。在 LDF 中，中度疏伐（全树收获）将从生态系统中去除树木中储存的 28.4-37.3%的养分，而仅去除茎干收获的 5.9-14.1%的养分储量。出于这些原因，在森林中收获后留下采伐剩余物将最大限度地减少养分损失。研究结果表明，在森林生态系统中改进养分管理将为森林的可持续性做出重大贡献。
