We performed a rational reconstruction of the relationship between biogeochemistry and the study ... more We performed a rational reconstruction of the relationship between biogeochemistry and the study of ecological productive systems. A structural and a functional possibility for building biogeochemical integrated models with optimal complexity have been identified. The conceptual framework was then applied to metals in contaminated areas. Metal mobility results from the interaction (coupling) of environmental entities at a multitude of scales. We classified for the managerial interest the processes involved in metal mobility by their ...
Romania is a medium-sized country (23.83x10 6 ha), located in the southeastern part of Europe. Ph... more Romania is a medium-sized country (23.83x10 6 ha), located in the southeastern part of Europe. Physiographically, plains and tablelands occupy 49.3 percent of the country area, hills occupy 30.2 percent, and mountains 20.5 percent.
In the Zlatna area located in the Western Carpathian region of Romania, around an industrial comp... more In the Zlatna area located in the Western Carpathian region of Romania, around an industrial complex involved in mining, metallurgical and chemical activities, the environment and particularly the soils are polluted due to the acid rains and heavy metals on 55,664 hectares. About 68% of the soils in the area affected by the emissions from these industrial activities present a high vulnerability to the impact of these pollution types. The increase of the natural soil acidity up to 3.6-3.9 pH values and soil loading with heavy metals at content levels exceeding up to 41 (Pb), 11 (Cu), 7 (Zn), 4 (Cd) times the maximum allowable limits contributed to soil base depletion, microbiological activity disturbance, organic matter degradation, soil structure deterioration, sheet and gully erosion, as well as landslides.
In order to cover with vegetation the red mud deposition from Tulcea tests with pasture plants ha... more In order to cover with vegetation the red mud deposition from Tulcea tests with pasture plants have been carried out, in the climate maintenance room. The composite nutritive layer on which the plants were grown consisted of red mud (50%) and phosphogypsum, acid peat, sawdust, compost, and sludge from wastewater treatment, 10% each. In another variant the phosphogypsum and compost percentages were changed, at 5, respectively 15%. Out of the four plant species tested, Lolium perene had the best growth, highlighted both as height and weight. Phleum pratense, Dactys glomerata and Lotus corniculatus followed, in decreasing order. The composite material on which the pasture plants developed had a slightly alkaline reaction and a high organic carbon, total nitrogen, mobile phosphorus and potassium, copper, zinc, cadmium, and chromium contents, and also an advanced salinization, in which natrum sulphate (Na2SO4) predominates. In the dry matter of the plants normal contents of macro elements were determined, except for natrium (Na), which average content was eight times higher than the right limit of the normal content interval. The contents of metallic microelements and heavy metals laid in the normal values area, except for zinc (Zn), which values were twofold the zinc content of plants grown on a normal soil (control variant).
We performed a rational reconstruction of the relationship between biogeochemistry and the study ... more We performed a rational reconstruction of the relationship between biogeochemistry and the study of ecological productive systems. A structural and a functional possibility for building biogeochemical integrated models with optimal complexity have been identified. The conceptual framework was then applied to metals in contaminated areas. Metal mobility results from the interaction (coupling) of environmental entities at a multitude of scales. We classified for the managerial interest the processes involved in metal mobility by their ...
Romania is a medium-sized country (23.83x10 6 ha), located in the southeastern part of Europe. Ph... more Romania is a medium-sized country (23.83x10 6 ha), located in the southeastern part of Europe. Physiographically, plains and tablelands occupy 49.3 percent of the country area, hills occupy 30.2 percent, and mountains 20.5 percent.
In the Zlatna area located in the Western Carpathian region of Romania, around an industrial comp... more In the Zlatna area located in the Western Carpathian region of Romania, around an industrial complex involved in mining, metallurgical and chemical activities, the environment and particularly the soils are polluted due to the acid rains and heavy metals on 55,664 hectares. About 68% of the soils in the area affected by the emissions from these industrial activities present a high vulnerability to the impact of these pollution types. The increase of the natural soil acidity up to 3.6-3.9 pH values and soil loading with heavy metals at content levels exceeding up to 41 (Pb), 11 (Cu), 7 (Zn), 4 (Cd) times the maximum allowable limits contributed to soil base depletion, microbiological activity disturbance, organic matter degradation, soil structure deterioration, sheet and gully erosion, as well as landslides.
In order to cover with vegetation the red mud deposition from Tulcea tests with pasture plants ha... more In order to cover with vegetation the red mud deposition from Tulcea tests with pasture plants have been carried out, in the climate maintenance room. The composite nutritive layer on which the plants were grown consisted of red mud (50%) and phosphogypsum, acid peat, sawdust, compost, and sludge from wastewater treatment, 10% each. In another variant the phosphogypsum and compost percentages were changed, at 5, respectively 15%. Out of the four plant species tested, Lolium perene had the best growth, highlighted both as height and weight. Phleum pratense, Dactys glomerata and Lotus corniculatus followed, in decreasing order. The composite material on which the pasture plants developed had a slightly alkaline reaction and a high organic carbon, total nitrogen, mobile phosphorus and potassium, copper, zinc, cadmium, and chromium contents, and also an advanced salinization, in which natrum sulphate (Na2SO4) predominates. In the dry matter of the plants normal contents of macro elements were determined, except for natrium (Na), which average content was eight times higher than the right limit of the normal content interval. The contents of metallic microelements and heavy metals laid in the normal values area, except for zinc (Zn), which values were twofold the zinc content of plants grown on a normal soil (control variant).
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