Ecologocal Assessment of Soils from Parks and Places in Stara Zagora | Екологична оценка на почви от паркове и местности в град Стара Загора
2010
Petkov, G., Tracian University, Stara Zagora (Bulgaria) | Yablanski, Ts., Tracian University, Stara Zagora (Bulgaria) | Todorova, M., Tracian University, Stara Zagora (Bulgaria) | Pavlov, D., Tracian University, Stara Zagora (Bulgaria) | Kostadinova, G., Tracian University, Stara Zagora (Bulgaria) | Barakova, V., Tracian University, Stara Zagora (Bulgaria)
The study was carried out under Project Assessment, reduction and prevention of air, water and soil pollution in Stara Zagora region, № 2008/115236, funded by the Norwegian Cooperation Programme with Bulgaria - Norway Grants and Innovation Norway. Promoter of the project is Faculty of Agriculture at Thracian University – Stara Zagora. The study covers research and evaluation of soil quality in parks and places in the town of Stara Zagora, on the base of heavy metals and metalloids content. It was found that: The contents of the studied parameters were within limits as follows: Deluvial-meadow soil type parks: рН 7.23 - 8.21; content mg/kg: Fe 13024.0 - 31103.0, Mn 585.0 - 853.0, Cr 16.9 - 29.9, Cu 43.2 - 105.0, Zn 73.1 - 224.1, Pb 18.3 - 82.5, Cd 0.074 - 0.388; Cinnamon forest soil type: рН 7.96 - 8.01; content mg/kg: Fe 20454.0 - 22970.0, Mn 794.0 - 801.0, Cr 33.3 - 38.9, Cu 222.2 - 384.9, Zn 117.1 - 128.3, Pb 33.8 - 35.2, Cd 0.07 - 0.248. Ecological assessment of soil from the study objects shows that the content of Cr, Cu, Zn, Pb and Cd do not exceed the maximum permissible concentration MPC for different elements. The only exception is the content of Cu, which at one object exceeds 1.28 times MPC. The content of Cu, Zn and Pb exceed the corresponding precautionary concentrations PC Coefficient of technogenic – Kt 1 in three of the seven studied objects and corresponding background concentration BC Coefficient of abnormality – Ca 1 in all studied objects. Data for Kt and Ka show existing technogenic load of soil in the study objects without risk to soil ecosystems, the environment and human health. The content of Cr and Cd in soil is within the background concentrations. The content of Mn and Fe in soil is typical of soils in Bulgaria. In the parks next to streets with heavy traffic, content of Pb in soil is higher than other studied objects.
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