Bu araştırmada, Samsun yöresi topraklarının demir (Fe), Bakır (Cu), çinko (Zn), mangan (Mn), kadmiyum (Cd), kurşun (Pb) ve nikel (Ni) kapsamları ile bu ağır metallerin toprakların enzim aktiviteleri üzerine olan etkileri belirlenmiştir. Toprak örneklerinin toplam ve alınabilir Cu, Fe, Cd ve Ni miktarlarının sınır değerlerin çok üzerinde olduğu saptanmıştır. Toplam Zn değerlerinin bazı toprak örneklerinde de sınır değerlerin üzerinde olduğu görülmüştür. Araştırmada kullanılan toprakların üreaz enzim aktivitesi değerleri 10.65-27.58 mg N 100 g $top^{-1}$ arasında değişmektedir. Üreaz aktivitesi ile organik madde, azot ve toplam fosfor arasında çok önemli pozitif (p

In this study, Fe, Cu, Zn, Mn, Cd, Pb an Ni status of the soils of Samsun region and the effect of heavy metals on soil enzyme activities were investigated. The amount of total and plant available Cu, Fe, Cd and Ni of the soil samples were found to be over limit values. In addition, total amount of Zn in fcome soil samples was also higher than the limit value. Urease enzyme activities of the soil samples being used range from 10,65 to 27,58 mg N 100 g $soil^{-1}$. A very significant positive correlation (P<0,01) was observed between urease activity and organic matter, nitrogen and total phosphorous. Wherease, the correlation betweeen other total and available metals was significant negative (P<0,01). A negative correlation between alkaline phosphatase and available phosphorous, and a positive correlation between the aforementioned enzyme and organic matter weactivities and between acid phospatase activity and total Cu, Mn, and Ni were observed, p-glikozidase enzyme activity varies from 2,40 to 4,97 mg salingen 100 g $soil^{-1}$. A positive (p<0.01) correlation between $\beta$ -glikozidase activity and organic matter, nitrogen and cation exchange capacity was recordedre found. Negative correlations between total Fe, Cu, Zn, Cd, Pb and alkaline phosphatase