Browsing by Author "Şevik, H."

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A Comparative Study About Physical Properties of Copper Oxide and Zinc Oxide Nanoparticles on Fagus orientalis L. as Bioindicator
(Springer Nature, 2024) Isinkaralar, K.; Isinkaralar, O.; Özel, H.B.; Şevik, H.
Nanoparticles (NPs) have recently begun to be used extensively in many areas of our lives. It is stated that the resulting NPs pollution will affect even the most remote ecosystems on the Earth. Therefore, determining the effects of NPs on diverse ecosystems is a research topic of interest. From this perspective, current researches on NPs affecting forest ecosystems and forest trees are very scarce. The aim of this investigation was to reveal the inhibitory and toxic properties of CuO and ZnO-NPs on oriental beech seed germination parameters and identify the toxic threshold values of CuO and ZnO-NPs. Therefore, the oriental beech (Fagus orientalis L.) seeds obtained from ten populations (P1 to P10) were treated with CuO and ZnO-NPs as single compounds at concentrations of 200, 400, 600, 800 and 1000 mg/L and germination rate (GR), germination percentage (GP), root collar diameter (RCD), plumula length (PL), radicle thickness (RT) and radicle diameter (RD) were determined for 35 days. The water containing CuO-ZnO NPs as a single compound at 1000 mg/L negatively affected all growth in general. The significant decrease in our study occurred at P9. The CuO-ZnO NPs were reduced in GP, RCD, PL, RT, and RD as 3.5–4.2%; 11.2–0.1%; 9.1–36.4%; 23.07–38.46%; and 39.29–17.86%, while GR enhanced as 21.46–20.09%. It was found that water with a low concentration of NP (200 mg/L) is suitable for irrigation of seeds grown in soil media and does not have a significant toxic effect on the growth and uptake of metal ions. The findings and limitations of the present research allow us to assess the feasibility of reusing NP-contaminated water in agriculture. Nevertheless, further research is needed to understand the toxic effects of NP mixtures on growth and absorption mechanisms.
A Statistical Analysis of Traffic-Related Pollution and City Center Dynamics in Ankara: The Cases of Ulus and Kızılay
(2023) Işınkaralar, Ö.; Şevik, H.
Urban pollution, which reduces the quality of life of residents and poses a vital threat to human health, can be reduced by effective city planning. Pollution due to heavy metals is increasing in today’s cities, and these heavy metals are of particular concern because as they do not naturally decompose on earth, they can bioaccumulate in the human body and cause serious diseases. It is, however, possible to reduce exposure to pollutants through making spatial decisions. The research aims to determine the variation of concentrations of Mn by location, which is greatly affected by the poor air quality caused by traffic density. Within the scope of the study, the following species were analyzed: Robinia pseudoacacia, Platanus orientalis, Acer negundo, Fraxinus excelsior, Ailanthus altissima, Aesculus hippocastanum, and Tilia tomentosa. Samples were taken from Ulus, the traditional center of the political capital of Ankara, and Kızılay, its modern center. Although the two areas of research are close to each other, the traffic density had increased due to the current planning decisions in Kızılay, while Ulus was chosen as a region with relatively low vehicle density due to its historical structure. It was found that four wood species have higher values in their leaves and wood, and five wood species have higher values in their bark in the Kızılay region, as compared to Ulus. This demonstrates that motor vehicles have a significant effect in Kızılay. In addition, the values of the leaves and bark of the same wood are higher in Kızılay than Ulus. It has therefore been determined that A.negundo and F. excelsior are suitable species for use in urban planting design to monitor the concentrations of heavy elements in the air.
Effects of Silver Nanoparticles on Germination and Seedling Characteristics of Oriental Beech (Fagus orientalis) Seeds
(North Carolina State University, 2024) Özel, H.B.; Şevik, H.; Yıldız, Y.; Çobanoğlu, H.
Nowadays, the applications of nanotechnology are increasing in various fields such as information technology, energy, the medical sector, and agriculture. Nanotechnology has proved its ability to solve problems in agriculture and related industries. Establishing the impact of nanoparticles on various ecosystems has become a primary research topic, but studies on forest ecosystems and trees are quite limited. This study examined the effects of silver nanoparticles on the germination parameters of oriental beech seeds and established their toxic threshold values. Silver nanoparticles were applied at concentrations of 200, 400, 600, 800, and 1000 mg/L to oriental beech (Fagus orientalis) seeds collected from 10 different populations in order to identify the germination rate, germination percentage, seedling height, root collar diameter, plumula length, radicle thickness, and radicle length parameters. The results revealed that silver nanoparticles have a negative effect on germination and seedling parameters of oriental beech seeds, and that this effect is clearly seen in the germination rate at 20 mg/L levels and in seedling characters starting from 60 mg/L dose, causing a decrease of 13% in germination rate, 24% in germination percentage, 40% in plumula length, and 30% in radicle length. The Kahramanmaras-Andirin population was found to be the most affected by nanoparticles, while the Bursa-Inegol and Ordu-Akkus populations were the least affected
Possible Changes of Pinus nigra Distribution Regions in Türkiye with the Impacts of Global Climate Change
(North Carolina State University, 2024) Cantürk, U.; Koç, İ.; Özel, H.B.; Şevik, H.
Global climate change poses significant threats to ecosystems worldwide, particularly impacting long-lived forest tree species such as Pinus nigra. This study assessed the potential shifts in distribution areas for Pinus nigra, an important tree species, one highly vulnerable to global climate change, given its prevalence in continental climates, in Türkiye under different climate scenarios (SSPs 585 and 245). In this study, suitable distribution regions of Pinus nigra were evaluated based on SSPs 585 and SSPs 245 using nine different models. Results indicated potential losses in Pinus nigra distribution areas ranging from 15.0% to 43.5% (SSPs 245) and 19.7% to 48.9% (SSPs 585) by 2100. However, in 2100, new suitable distribution areas are expected to be formed at rates ranging from 13.8% to 32.1% and 15.1% to 34.4% according to the above scenarios. Because most of the newly formed suitable distribution regions are quite far from the areas where the species currently spreads, it seems necessary to provide the migration mechanism needed by the species by humans to prevent population losses in this process.
Shifts That May Appear in Climate Classifications in Bursa Due to Global Climate Change
(Istanbul University-Cerrahpaşa, 2024) Arıcak, B.; Cantürk, U.; Koç, İ.; Erdem, R.; Şevik, H.
Global climate change (GCC) is defined as a process that is considered the most crucial problem of the current century and will affect all living things and ecosystems in the world. In order to specify the potential impacts of this phenomenon, which does not seem possible to stop, it is necessary first to predict the change in climate types. Therefore, the current study aimed to define the shift of climate classifications (according to De Martonne, Erinç, and Emberger climate category) in 2040, 2060, 2080, and 2100 for Bursa, one of the largest cities in Türkiye, according to the SSPs 245 and SSPs585 scenarios, and compare it with its current situation. As a result, it was determined that the climate types in Bursa province would change significantly and primarily manifest as a shift into arid climate types. It is recommended to take precautions on a sectoral basis to avoid the devastating effects of GCC.