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Lichens have been widely used in biomonitoring studies. In this study, Cd, Cu, Pb and Zn concentrations in some foliose and fruticose lichens which are found in Samsun were investigated and the differences among the species in terms of trace element concentrations and possible interactions among heavy metals were also examined. The results of the present study show that the study area is polluted by Pb and Cd. The cadmium contamination levels were also higher than those of the other elements. The highest Pb (101.39 ppm), Cu (43 ppm) and Zn (67.60 ppm) levels were found in Physcia adscendes. In addition to this, Hypogymnia physodes is one of the foliose species and the best accumulator of Cd (245.73 ppm) as compared to the other species. Samsun Ýlinde Ýz Element Konsantrasyonlarýnýn Likenler Kullanýlarak Biyolojik Olarak Belirlenmesi ÖzetLikenler biyomonitör çalýþmalarýnda yaygýn olarak kullanýlýrlar. Bu çalýþmada, Samsun ilinde yayýlýþ gösteren bazý yapraksý (foliose) ve dalsý (fruticose) likenlerde Cd, Cu, Pb ve Zn konsantrasyonlarý ve iz element konsantrasyonlarý açýsýndan türler arasýndaki farklýlýklar ve aðýr metaller arasý muhtemel etkileþimler incelendi. Mevcut çalýþmanýn sonuçlarý çalýþma alanýnýn Pb ve Cd tarafýndan kirlendiðini gösterdi. Kadmiyum kirliliði seviyeleri diðer elemetlerinkinden yüksektir. En yüksek Pb (101.39 ppm), Cu (43 ppm) ve Zn (67.60 ppm) seviyeleri Physcia adscendes'de bulundu. Buna ilave olarak, yapraksý türlerden birisi olan Hypogymnia physodes diðer türler ile karþýlaþtýrýldýðýnda en iyi Cd (245.73 ppm) biriktiren türdür.

Abstract.-In this study, the vegetation of Boztepe Forest Protection Area (Unye/Ordu, Turkey), which is located at the middle part of Black Sea region, has been investigated from the phytosociological point of view. The vegetation of the study area was analyzed according to Braun-Blanquet's method and ordinated by TWINSPAN and CA. We described five associatons belonging to different vegetation types in the study area. These are as follows: Calluno vulgarisArbutetum unedonis ass. nov., Hedero helicis-Castaneetum sativae Yurdakulol et al., Rubo caucasici-Quercetum hartwissianae ass. nov., Carpino betuliPopuletum tremulae ass. nov. and Diospyro loti-Alnetum barbatae ass. nov. The diversity index of associations is calculated by Shannon-Wiever's diversity formula.

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