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2 Polish Journal of Environmental Studies

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Effects of water stress on seed germination for select landscape plants

100%

Sevik H. , Cetin M.

tom 24

nr 2

In this study, the effect of water stress on the germination rate of the seeds of nine pieces of species used for landscaping works in Kastamonu is investigated. The seeds of these species have been subject to germination trials with water stress level between 0 and -8 bar and the germination percentages of the seeds have been identified. The water stress was constituted with the use of polyethylene glycol (PEG-6000) solution and germinations were carried out at 25ºC in a period of 35 days. Depending on the water stress as a result of these studies, it has been stated that the percentages of all species have decreased as from -2 bar water stress; there are no germinations in -6 bar water stress for the tree of heaven, and in -8 bar water stress for Cupressus arizonica and Sophora japonica. We found that the species most resistant to water stress are Pinus nigra, Cupressus sempervirens, and Pinus brutia.

Changes in heavy metal accumulation depending on traffic density in some landscape plants

80%

Turkyilmaz A. , Sevik H. , Cetin M. , Saleh E. A. A.

tom 27

nr 5

Air pollution is among the major problems stemming from modern urban life. Millions of people worldwide die from air pollution every year. Especially heavy metals have great importance among these pollutants. Because heavy metals can stay in nature for a long time without deterioration, and their concentration in the environment is constantly increasing. They also tend to bioaccumulate. Many heavy metals arise from exhaust gases, car wheels, vehicles, and vehicle corrosion in cities. Determining heavy metal concentrations in plants is important both for determining the ability of plants to remove heavy metals from the air, and thus to be used as a means of increasing air quality, as well as for monitoring air quality. The purpose of this study is to determine the variation of different heavy metal concentrations, depending on the traffic density, in some landscape plants sampled from areas with different levels of traffic density. Our results show that heavy metal accumulation differs according to both plant species and traffic density. In traffic-dense areas we measured the greatest amounts of Cu, Ni, and Fe in Prunus cerasifera; of Ca, Mg, and Mn in Ailanthus altissima; of Cr and Zn in Elaeagnus angustifolia; and of Pb and Cd in Tilia tomentosa.