SELENIUM IN THE ROCK – SOIL SYSTEM FROM SOUTH-EASTERN PART OF ROMANIA
Journal Title: Present Environment and Sustainable Development - Year 2010, Vol 4, Issue 4
Abstract
Total and mobile selenium contents in soils and rocks was studied in the South-Eastern part of Romania, namely South and Central Dobrogea and the South-Eastern Romanian Plain. The average total selenium content in the rocks and parent materials is lower than the values presented in literature for rocks and similar materials. The total selenium content of the upper horizon (0-20 cm) of the South-Eastern Romanian Plain soils is 65% higher as compared to the content registered in the Central and South Dobrogea soils (237 and 143 g·kg-1, respectively). Ascompared to the average value of the total selenium content in the soils all over theworld considered unaffected by deficiencies or excess (383 255 g·kg-1), the totalselenium content of the South-Eastern Romanian Plain soils is almost 40% lowerand that of the Central and South Dobrogea soils 63% lower. As compared to theaverage mobile selenium content in the South-Eastern Romanian Plain soils (14g·kg-1), in the soils of Central and South Dobrogea 3.5 times lower average valueswere registered (4 g·kg-1). Between the mobile and total selenium contents on onehand and the aridity index (De Martonne) on the other hand, direct proportionality relations, statistically ensured, have been established. Between the total and mobile selenium contents of the upper horizon of the soils from South-East Romania direct proportionality relations, statistically ensured have been established. The mobile selenium content is higher in the slightly acid soils as compared to the neutral or alkaline ones. Between the mobile and total selenium contents, on one hand, and the humus, total nitrogen, mobile phosphorus and potassium on the other, direct proportionality relations, statistically ensured have been established.
Authors and Affiliations
Radu Lăcătuşu, Mihaela Lungu, Mihaela Aldea, Anca Lăcătuşu, Venera Stroe, Rodica Lazăr, Nineta Rizea
Keywords
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