DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 3-5/1991 str. 51 <-- 51 --> PDF |
Introduction of Heavy Metals by Polluted Flood Waters into Soils of Lowland Forests of East Slavonia Summary The results of research of lead, zinc, copper, iron and manganese content in soils of lowland forests of east Slavonia reveal the following: Soils flooded by Drava, Dunav and Sava rivers are more loaded with heavy metals than the soils of the surrounding, non-flooded terrains. The content of heavy metals in river sediments of Drava and Dunav rivers is as a rule lower than the one in soils of flooded areas. Sava sediments have heavier mechanical composition and contain more organic matter and therefore have higher capacity of heavy metals linking. Relatively low concentrations of lead and zinc were determined in soils of Spačva basin. These soils are nevertheless more loaded by heavy metals and copper than the soils of middle Posavina. The content of lead and zinc in soils flooded by Drava, Dunav and Sava waters by far exceedes the values set as limits for toxic impact on forest trees, young crops especially. It can have negative cansequences on game, fungi and other secundary forest products and consequently on man, too. In the area of Spačva basin, the content of lead and zinc is lower than the values considered toxic for forest trees. The content of copper in all the analyzed samples is within the »permitted« limits. Soils exposed to floods of polluted waters have generally high reaction and contain much organic matter. It is particulary important for reduction of activities and toxicity of heavy metals. Further increase of soil loading by heavy metals can be stopped only by filtering waste that pollute Drava, Dunav and Sava rivers an their tributaries. English oak stands with developed underwood have shown to be a good barrier to spreading of lead from car exhaust gases. |