Yazar "Sevik, Hakan" seçeneğine göre listele
Listeleniyor 1 - 18 / 18
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Assessing the possibility of airborne bismuth accumulation and spatial distribution in an urban area by tree bark: A case study in Duzce, Turkiye(Springer Heidelberg, 2023) Isinkaralar, Kaan; Isinkaralar, Oznur; Koc, Ismail; Ozel, Halil Baris; Sevik, HakanHeavy metal accumulation has been a hot topic of many studies in recent years, as they are toxic elements that can be highly harmful to human health and the environment. The metal concentrations of some trees used for monitoring air quality give information about the pollutant sources in the ambient atmosphere. In this study, P. pinaster, C. arizonica, P. orientalis, C. atlantica, and P. menziesii were determined to investigate their use as biomonitors for air quality. Metallic bismuth and bismuth compounds, which have been widely used in several industries, have low toxicity to humans, although bismuth toxicity can show over-dosage depending on its application. The variability of bismuth levels in the organs of the species was investigated to explain atmospheric deposition over the years. The bismuth accumulation of C. arizonica and P. pinaster increases depending on time interval. The ascending-descending trend in other species could not be obtained clearly via dry and wet deposition of atmospheric metals. Our analysis reveals that the total deposit (barks and wood) of P. pinaster, C. arizonica, P. orientalis, C. atlantica, and P. menziesii were 134, 115, 94, 131, and 148 mg/kg, respectively, and they have been quite clearly reflected atmospheric bismuth deposition. The bismuth concentration has significantly increased since the 1983 sampling; P. menziesii can be valuable bioindicators for highlighting polluted areas. Compared with the traditional air samplers, the proposed P. menziesii bioindicator is proven to be more effective, low cost, and sustainable and thus has broad application prospects in bismuth concentration.Öğe Assessing Tree Species for Monitoring and Mitigating Strontium Pollution in Urban Environments(Springer Int Publ Ag, 2025) Kulac, Semsettin; Pulatoglu, Ayse Ozturk; Koc, Ismail; Sevik, Hakan; Ozel, Halil BarisAir pollution, particularly heavy metal contamination, has emerged as a critical global issue, posing significant human and environmental health risks over the past century. Strontium (Sr), a highly hazardous heavy metal, even at small concentrations, is classified as a priority contaminant by international organizations due to its potential adverse effects. This study aimed to specify the most appropriate plant species for observing and mitigating Sr contamination. Samples were collected from Pseudotsuga menziesii (Douglas fir), Tilia tomentosa (Silver linden), and Fraxinus excelsior (European ash or common ash) growing in D & uuml;zce, T & uuml;rkiye, one of the five most unclean towns in European countries according to the 2021 World Air Pollution Report. Variations in Sr concentrations over the past 60 years were analyzed based on tree species, tree organs, direction, and age group. The findings reveal that these species are unsuitable as biomonitors for tracking Sr pollution trends. However, all three species demonstrated the ability to accumulate significant levels of Sr in their wood, making them viable candidates for phytoremediation efforts. Among the species studied, European ash trees were the most effective in reducing Sr contamination, with the highest Sr accumulation in wood (11.36 mg/kg).Öğe Assessment of 40-year Al Deposition in some Exotic Conifer Species in the Urban Air of Düzce, Türkiye(Springer Int Publ Ag, 2025) Koc, Ismail; Canturk, Ugur; Cobanoglu, Hatice; Kulac, Semsettin; Key, Kubra; Sevik, HakanHeavy metal (HM) pollution in urban air, a global dilemma, has increased drastically in the last century. Aluminum (Al) is one of the HMs and a neurotoxic element that can be absorbed into human tissues through digestion, breathing, and skin. Al accumulation in humans can cause diseases and even cause death. Due to the risks it poses to human and environmental health, it is vital to track the Al contamination shifts in the airborne and decrease them. In this study, 40-year Al concentration differences in Pseudotsuga menziesii, Cedrus atlantica, Picea orientalis, Cupressus arizonica, and Pinus pinaster grown in D & uuml;zce, T & uuml;rkiye, the fifth most polluted European town, in terms of direction, tree species, and tissue type were assessed. As a result, Al accumulation in the tissues generally varies as outer bark > inner bark > wood. Whole species can accumulate Al significantly, and Al transfer between adjacent cells in the wood part is limited. In conclusion, all species can be used as biomonitors to track temporal Al pollution changes. However, the highest concentrations, especially in the wood part, were observed in Cedrus atlantica, Picea orientalis, and Cupressus arizonica, and these species were chosen to be the most suitable species to be used in phytoremediation studies.Öğe Assessment of metals (Ni, Ba) deposition in plant types and their organs at Mersin City, Türkiye(Springer, 2024) Koc, Ismail; Canturk, Ugur; Isinkaralar, Kaan; Ozel, Halil Baris; Sevik, HakanThe increase in heavy metal concentrations in the air, especially after the Industrial Revolution, is notable for the scientific world because of the adverse effects that threaten environmental and human health. Among the trace elements, nickel (Ni) is carcinogenic, and all barium (Ba) compounds are toxic. Trace elements are critical for human and environmental health. Their threat further increases, especially in the urban areas and surroundings with a high population. In urban areas, the trace element contamination in the airborne can be reduced using plants. However, which plant and plant organs absorb trace elements could not be determined. In the present study, Ni and Ba concentrations in the branch, wood, and leaf samples of 14 species collected from the city center of Mersin province were determined. As a result, broad-leaved species' Ni and Ba concentrations in their leaf sample were generally higher than other species. Almost all species had the lowest Ni and Ba concentrations in their wood samples. Among these 14 species, it was found that Ni concentration was very high, especially in non-washed leaves of Platanus orientalis, Photinia serrulata, and Citrus reticulate, and Ba concentration was very high in Citrus reticulata, Chamaecyparis lawsoniana, Laurus nobilis, and Acer hyrcanum. Using broad-leaved species in urban areas where pollution is at high levels will significantly contribute to reducing Ni and Ba pollution. It is recommended that these points be considered in future urban landscaping projects.Öğe Atmospheric Trace Metal Exposure in a 60-Year-Old Wood: A Sustainable Methodological Approach to Measurement of Dry Deposition(Springer Int Publ Ag, 2025) Isinkaralar, Kaan; Isinkaralar, Oznur; Koc, Ismail; Sevik, Hakan; Ozel, Halil BarisUrban trees are essential in improving environmental quality and enhancing human welfare in urban areas. They are being utilized increasingly as biomonitors of air and dust-borne heavy metals through dendrochemistry and comparative analytical methods. This study investigated the foremost concern essential nutrient metals, including aluminum (Al) and iron (Fe); also trace metals (cadmium (Cd), chromium (Cr), cobalt (Co), nickel (Ni), copper (Cu), and lead (Pb)) in worldwide-distributed trees in units of mg kg(-1 )dry weight (d.w). For retrospective analysis, we hypothesized that its feasibility as a bioindicator of air pollution in D & uuml;zce, T & uuml;rkiye, among the tree species should be assessed. Digested tree wood samples were processed via inductively coupled plasma optical emission spectrometry (ICP-OES) for all metals to test this hypothesis. Pearson's correlation analysis and principal component analysis were utilized to determine the origin of elements. The results showed that (i) the mean concentrations of the species were presented to be Fe (156 mg kg(-1) d.w) > Al (100.56 mg kg(-1) d.w) > Cr (15.82 mg kg(-1) d.w) > Cu (12.43 mg kg(-1) d.w) > Pb (6.76 mg kg(-1) d.w) > Ni (5.98 mg kg(-1) d.w) > Co (2.16 mg kg(-1) d.w) > Cd (0.47 mg kg(-1) d.w); ii) analysis of the bioconcentration factor (BCF) and metal accumulation index (MAI) showed that the maximum BCF and MAI value was stored in the Cupressus arizonica (2.30 for Pb) and Robinia pseudoacacia (70.65) in all species; iii) the tree woods were also capable of discriminating between affected areas, as sites near industrial and vehicular traffic indicated higher metal content. For this reason, it can be deduced that C. arizonica wood is a potentially suitable sink of atmospheric metal.Öğe Climate Change Effect on Potential Distribution of Anatolian Chestnut (Castanea sativa Mill.) in the Upcoming Century in Turkiye(Aves, 2023) Cobanoglu, Hatice; Canturk, Ugur; Koc, Ismail; Kulac, Semsettin; Sevik, HakanClimate change, which is effective on a global scale, affects almost all living creatures and ecosystems directly or indirectly. Forests are at the top of the ecosystems that are predicted to be affected more by climate. This study intended to determine how the growth regions of the Anatolian chestnut in Turkiye belong to one of the utmost vital forest tree species, which will be affected by climate change. Within the study scope, suitable areas for the growth of the species in 2040, 2060, 2080, and 2100 were determined under different scenario models [intermediate (shared socio-economic pathways 245) and most extreme (shared socio-economic pathway 585)] and compared with the natural distribution areas of today (the year of 2020). As a result of the study, it is predicted that the suitable distribution areas for Anatolian chestnut cultivation will decrease significantly, especially after 2060-2080, and even disappear entirely by 2080, according to the extreme scenarios. Even with the best scenario (shared socio-economic pathway 245), it is projected that the suitable growth regions for Anatolian chestnuts will decrease to one-fifth of today's levels in 2100. It may be recommended to create mixed forests with better-adapted chestnut varieties or origins for future conditions due to being more resilient to various environmental stress factors. In addition, considering the future projections, new chestnut plantations should be established in suitable areas for chestnut production.Öğe Climate change impacts on Taxus baccata distribution and conservation(Northeast Forestry Univ, 2025) Cetin, Ilknur Zeren; Ozel, Halil Baris; Varol, Tugrul; Canturk, Ugur; Sevik, HakanThis study looks at the impact of climate change on the future distribution of Taxus baccata L., a species under threat. It examines how altitudinal changes may influence distribution, projecting scenarios to 2100 using the SSPs 585 SSPs 245 scenarios in 20-year intervals. The results show a contraction in distribution in areas such as in Iceland and the United Kingdom, with certain extreme points disappearing. Simultaneously, new suitable areas are expected to emerge in select regions of Asia. The study underscores the significant changes anticipated in the distribution of T. baccata due to global climate change. It suggests that the threshold for addressing climate change on this particular species has been exceeded, and emphasizes the need for concerted efforts to mitigate and adapt to climate change impacts on ecosystems and organisms. As climate change affects various aspects of life, the study advocates for sector-wide plans. These would include efficient resource utilization, selecting genotypes for afforestation of this species with lower water requirements, incorporating climate change predictions into management plans, conserving biological and genetic diversity, and developing in-situ and ex-situ conservation strategies. Anticipation of future climate changes and corresponding measures in response are crucial to minimizing the impact on this species. The study recommends establishing mixed forests composed of species resilient to a range of climate scenarios, thereby enhancing forest continuity across regions with varying degrees of climate impact. Genetic diversity is an important defense mechanism important to preserving it. Global climate change will result in significant alterations in the distribution of certain species, potentially causing population declines. Intervention is required to support the adaptation of vulnerable species, necessitating forward-looking strategies that anticipate shifts in their habitat suitability. This study emphasizes the implications of climate change for T. baccata and underscores the urgency of targeted conservation efforts to protect its populations and ensure long-term persistence.Öğe Climate-Driven Shifts in Wild Cherry (Prunus avium L.) Habitats in Türkiye: A Multi-Model Projection for Conservation Planning(Mdpi, 2025) Canturk, Ugur; Koc, Ismail; Erdem, Ramazan; Pulatoglu, Ayse Ozturk; Donmez, Sevgi; Ozkazanc, Nuri Kaan; Sevik, HakanClimate change poses a serious threat to biodiversity, particularly for woody species with limited dispersal capacity such as Prunus avium L. (wild cherry). In this study, we assessed potential shifts in its suitable distribution range (SDR) across T & uuml;rkiye by applying an ensemble modeling framework that combined Generalized Additive Models (GAM), Maximum Entropy (MaxEnt), and Random Forest (RF). We used updated occurrence data (including GBIF and EUFORGEN records) and 11 ecologically relevant bioclimatic variables under SSP2-4.5 and SSP5-8.5 scenarios. Model performance was validated using AUC (Area Under the ROC Curve) and TSS (True Skill Statistic) metrics. Results suggest that while 60-70% of current SDRs remain stable by 2100, approximately 10% may be lost, with 20-23% new expansions. Temperature seasonality (Bio4) and seasonal precipitation (Bio15) were consistently identified as dominant predictors across models. Notably, newly suitable habitats are expected to be spatially isolated, limiting natural colonization. Our findings highlight the necessity of proactive conservation planning, including assisted migration and drought-resistant genotype selection, to ensure long-term persistence of wild cherry under changing climates. These results offer actionable insights for adaptive forest management and biodiversity conservation in Mediterranean-type ecosystems.Öğe Determination of Some Exotic Landscape Species As Biomonitors That Can Be Used for Monitoring and Reducing Pd Pollution in the Air(Springer Int Publ Ag, 2024) Sevik, Hakan; Koc, Ismail; Cobanoglu, HaticeHeavy metal levels have steadily risen over the past century due to the presence of human activity and are hazardous to human health and the environment. Regarding the health of humans and the environment, palladium (Pd) is among the most hazardous and toxic heavy metals. It is listed as a priority contaminant by the Agency for Toxic Substances and Disease Registry (ATSDR). As a result, eliminating pollution and tracking changes in Pd contamination in the air are the top research priorities. This study will be conducted on trees grown in D & uuml;zce, the fifth dirtiest city on the European continent, to identify appropriate species that may be utilized for tracking and mitigating Pd pollution in the air. Samples from Cupressus arizonica, Pinus pinaster, Cedrus atlantica, Pseudotsuga menziesii, and Picea orientalis will all be analyzed as part of the study, and the variations in Pd content according to species, organ, and direction will be assessed. The goal is to ascertain which biomonitors are best suited for tracking and mitigating lead contamination in the atmosphere. The study consistently found Pd contents in woods with different directions that developed within the same period. However, when the species were compared, notable differences were detected between the Pd levels formed in different directions in the same period for each species and the wood formed in the same direction in other periods. This variation suggests that Pd transfer in wood is restricted in all tested species. Consequently, every species performs as a reliable biomonitor for tracking Pd contamination.Öğe Dose-dependent effects of CuO nanoparticles on germination and early seedling growth in Prunus avium(Inst Forestry Lrcaf, 2025) Ozel, Halil Baris; Koc, Ismail; Yildiz, Yafes; Sevik, HakanNanoparticle pollution results from the release of nanoparticles into the environment, which are widely used in many areas today. For this reason, studies on nanoparticle pollution have gained significant momentum in recent years. However, studies on the effects of nanoparticle pollution on forest ecosystems and forest trees are restricted. The current study aimed to reveal the effects of copper oxide (CuO) nanoparticles, which are known for their high toxicity compared to other metal oxide nanoparticles, on the seed germination and seedling traits of Prunus avium. Seeds from 15 geographically diverse Turkish populations were treated with CuO nanoparticle solutions at five concentrations (200, 400, 600, 800, and 1,000 mg/L) to evaluate nanoparticle effects. Multiple growth parameters were quantified, including germination success (rate and percentage), radicle dimensions (length and thickness), and plumule elongation. The study results reveal that CuO nanoparticle applications affect all characters except the germination rate. Generally, germination and seedling traits are positively affected at low nanoparticle doses. However, with increasing doses, the parameters begin to decrease, and when using nanoparticles in high doses, a decrease is observed that can exceed 25% compared to the control group. In addition, it was found that there was a significant decline in both germination characteristics and seedling development as the dose increased after exceeding a certain dose level (400 and 600 mg/L). Significant differences were also found among seed populations. The lowest values for most parameters were recorded in the populations of Karab & uuml;k/Yenice and Bolu/ Mudurnu, whereas the highest ones were observed in the populations of Tekirda & gbreve;/& Scedil;ark & ouml;y, & Ccedil;anakkale/Lapseki, and Kocaeli/Kefken, Turkey.Öğe Effects of Silver Nanoparticles on Germination and Seedling Characteristics of Oriental Beech (Fagus orientalis) Seeds(North Carolina State Univ Dept Wood & Paper Sci, 2024) Ozel, Halil Barm; Sevik, Hakan; Yildiz, Yafes; Cobanoglu, HaticeNowadays, 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.Öğe Impacts of climate change scenarios on European ash tree (Fraxinus excelsior L.) in Turkey(Elsevier, 2021) Varol, Tugrul; Canturk, Ugur; Cetin, Mehmet; Ozel, Halil Baris; Sevik, HakanClimate change is expected to have various impacts on forest ecosystems through drought, heat stress, insect invasions and forest fires. Therefore, lack of taking the necessary measures in time will lead to the extinction or endangerment of valuable species. The entropy method was used in order to estimate the geographic distribution of Fraxinus excelsior L. available in Turkey under present and future climate conditions. 19 bioclimatic variables obtained from the monthly data within 30 provinces, where Fraxinus excelsior L. was found in Turkey, as well as the topographic variable of elevation were used in the modelling process. The results show that Fraxinus excelsior L. is largely affected by precipitation in the driest month, the driest quarter and the hottest quarter. According to the response curve of Fraxinus excelsior L. in Turkey, it is observed that it prefers the habitats with average precipitation of 22 mm in the driest month, average precipitation of 100 mm in the driest quarter and the precipitation over 70 mm in the hottest quarter. The SSPs 245 and SSPs 585 climate scenarios, respectively, show that the geographic distribution of Fraxinus excelsior L. will narrow by 7.58% and 6.28% in 2100. All of these results show that species response to the individual and communal impacts as well as the impacts at ecosystem scale dictated by climate change by changing their climatic niches. Most of the plant species that lack an effective and rapid migration ability will have difficulty in finding suitable habitat areas. Thus, the ecological consequences of the narrowing experienced in the foreseen borders may have serious consequences for both the management and protection of forests.Öğe Monitoring Arsenic Concentrations in Airborne Particulates of Selected Landscape Plants and Their Potential for Pollution Mitigation(Aves, 2025) Ismail, Tuerkan Sultan Yasar; Ismail, Muhammad Danial; Cobanoglu, Hatice; Koc, Ismail; Sevik, HakanAmong the most dangerous pollutants in terms of environment and living health are heavy metals, the concentrations of which have been continuously increasing within nature due to anthropogenic effects in recent years. Arsenic (As), one of the most harmful heavy metals, is extremely dangerous to living beings even at low concentrations. Therefore, observing the change of As pollution in the airborne and reducing pollution are priority research topics. In this study, the usability of some landscape plants for observing and decreasing the alteration of As pollution in the airborne was evaluated. Within the scope of the study, changes in As concentration in five landscape plants growing in D & uuml;zce, one of the most polluted cities in Europe as stated by the World Air Pollution Report, were examined in terms of species, organs, directions, and age range over the last 60 years. As a conclusion of the study, As concentration in samples taken from Fraxinus excelsior, Tilia tomentosa, and Pseudotsuga menziesii remained below detectable limits. It was concluded that Cedrus atlantica and Robinia pseudoacacia are not suitable biomonitors for monitoring the change in As pollution, but they can be used effectively to reduce As pollution since they can accumulate very high levels of As.Öğe Possible Changes of Pinus nigra Distribution Regions in Türkiye with the Impacts of Global Climate Change(North Carolina State Univ Dept Wood & Paper Sci, 2024) Canturk, Ugur; Koc, Ismail; Ozel, Halil Baris; Sevik, HakanGlobal 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 T & uuml;rkiye 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.Öğe Proof of concept to characterize historical heavy-metal concentrations in atmosphere in North Turkey: determining the variations of Ni, Co, and Mn concentrations in 180-year-old Corylus colurna L. (Turkish hazelnut) annual rings(Springer Heidelberg, 2023) Key, Kubra; Kulac, Semsettin; Koc, Ismail; Sevik, HakanHeavy metals (HMs) are among the pollutants posing a significant threat to human, animal, and environmental health. Therefore, monitoring HM concentration changes, especially in the air, is crucial. This study used Corylus colurna L. (Turkish hazelnut) annual tree rings cut in 2020, and it was intended to define the 180-year variations in concentrations of Ni (nickel), Co (cobalt), and Mn (manganese) that are among the most harmful HMs. This study analyzed HMs concentrations in the wood, outer and inner bark in the north, south, east, and west directions and the seasonal variations in HM concentrations in tree rings. It was determined that, for all the three elements, the wood and barks significantly differed (P < 0.001) only in the north side, and the concentrations in wood were much lower than in the bark. The maximum concentrations were usually observed in annual rings in the west and south directions. The changes by both organ and direction can be related to the iron and steel factory and the highway, which are defined as HM sources. The results also revealed that the relocation of Co, Ni, and Mn in the wood of C. colurna tree remained at a limited level. The results suggest that C. colurna annual tree rings are very useful in tracking the variation of Ni, Co, and Mn concentrations.Öğe Tissue-specific barium accumulation in five conifer species: a 40-year dendrochemical assessment from a polluted urban environment(Springer, 2025) Sevik, Hakan; Koc, Ismail; Cregg, Bert; Nzokou, PascalHeavy metal pollution is one of the most crucial issues threatening human and environmental wellness today. Barium (Ba), a widely used heavy metal, is one of the most hazardous for the environment and human wellness as all of its compounds are toxic. Therefore, monitoring and reducing Ba pollution is one of the priority study topics. This research aims to identify the most proper plant species for monitoring and mitigating both Ba sources as pollutants and Ba pollution. We examined 40-year-old Cedrus atlantica, Pseudotsuga menziesii, Pinus pinaster, Picea orientalis, and Cupressus arizonica trees grown in D & uuml;zce, which is among the five most unclean towns in Europe. Ba concentration was determined in annual tree rings and compared based on tree species, tree tissue, direction, and tree age. The most elevated Ba concentrations were generally obtained in the outer bark and the west direction in all tree species. Results revealed that agricultural activities led to a significant rise in Ba pollution and that all species had limited Ba allocation in their wood. As a result, the change in Ba pollution could be monitored using all of these species. It is concluded that the most proper tree species for sinking Ba pollution is P. orientalis, which accumulated the most Ba in wood.Öğe Using Trees to Monitor Airborne Cr Pollution: Effects of Compass Direction and Woody Species on Cr Uptake during Phytoremediation(North Carolina State Univ Dept Wood & Paper Sci, 2025) Pulatoglu, Ayse Ozturk; Koc, Ismail; Ozel, Halil Baris; Sevik, Hakan; Yildiz, YafesAmong the heavy metals (HMs) whose concentrations in natural environments have risen considerably in the last era, chromium (Cr) is one of the most toxic. Because of the risks it poses to human and environmental health, it is of great importance to screen the variation in Cr contamination in the atmosphere and decrease the pollution. This study aimed to determine the proper tree species that can be used to monitor and reduce Cr contamination. For this aim, studies were conducted on Tilia tomentosa, Robinia pseudoacacia, Cedrus atlantica, Pseudotsuga menziesii, and Fraxinus excelsior species growing in D & uuml;zce, which is among the 5 most contaminated European towns according to the World Air Pollution report. Samples taken from these trees were examined, and changes in Cr concentration depending on species, organs, compass direction, and age range in the last 60 years were evaluated. Results indicated higher Cr pollution in recent years, consistent with higher traffic density, but that there was no consistent effect of compass direction. It was also determined that the tree species most appropriate for screening the variation in Cr contamination in the airborne were Tilia tomentosa, and the most appropriate species for decreasing pollution were Robinia pseudoacacia and Cedrus atlantica.Öğe Variation of 40-year Pb deposition in some conifers grown in the air-polluted-urban area of Duzce, Turkiye(Springer, 2025) Koc, Ismail; Cobanoglu, Hatice; Canturk, Ugur; Key, Kubra; Sevik, Hakan; Kulac, SemsettinLead (Pb), one of the most lethal heavy metals (priority contaminant) in environmental and human health, spreads to the air as a metal or compound and has noxious properties. Therefore, tracking and diminishing Pb pollution are urgent and priority research topics. This study aims to contribute to the determination of suitable biomonitor species that can be used to observe Pb pollution shifts over a long period and hyperaccumulator species that can be used to lessen pollution. For this reason, it was selected to use species from Duzce, one of the five most unclean municipalities in Europe, including Pinus pinaster, Pseudotsuga menziesii, Cupressus arizonica, Cedrus atlantica, and Picea orientalis. The Pb concentration variations based on the species, organ, direction, and age range in the last 4 decades were assessed by examining the samples taken from tree species. The highest Pb concentrations were found in the outer bark and the east and north directions (high vehicle density) in almost all the species. These results showed that Pb pollution increases significantly due to vehicles. In conclusion, the displacement of Pb in wood was limited in these species; therefore, they could be used to track the Pb pollution change. C. arizonica and P. menziesii were determined to be suitable for reducing Pb pollution.
