RESEARCH REGARDING THE LANDSHAFT RECONSTRUCTION IN THE FORMER BAUXITE QUARRIES FROM PĂDUREA CRAIULUI MOUNTAIN
Journal Title: Natural Resources and Sustainable Development - Year 2013, Vol 3, Issue 1
Abstract
The reconstruction of the lansdshaft in the former bauxite quarries is a complex problem and the paper presents the results carried out during 2005-2013 in the research field placed in a former bauxite quarry from Zece Hotare, Bihor county. The former quarry is situated in the Padurea Craiului Mountain. The exploitation of the bauxite ended in 1998 and in 2004 and 2005 the complex work (levelling, mattresses on the hillside, planting) were carried out. Physical properties (bulk density, total porosity, penetration rezistance, hydraulic conductivity) chemical parameters (pH, humus, mobile phosphorum, mobile potassium) enzymatical activity (actual and potential dehydrogenase activity, acid and potential phosphatase activity, catalase activity, non-enzymatic catalytic activity, urease activity) are studied in 3 profiles situated in the high leveled area, low leveled area and on the hillside. The parameters of the land from former bauxite quarry comparated with the parameters of the soil from beech trea forest situated in adjacent area have the values less favourable. The installing of the planting vegetation was studied, too and the results of the research emphasize the positive influence of the fertilizers on the growth rhythm of the Robinia pseudocacia planted on the plateau area. The mattreses on the hillside determined a beter growth rhythm of the Pinus silvestris. The following spontanaeus species were installed in the former bauxite quarry. Tusilago farfara, Cirsium arvense, Poa pratensis, Rubus caesius, Calamagrostis epigeios, Hyepericus perforatum, Equisetum arvense, Polygonum persicaria, Juncus inflexus. The installing evolution was studied, too. The degree of the covering with the natural vegetation decreases altogether with the increase of the slope. Soil losses are in direct link with hillside slope. The mattreses execution determinate a very important decrease of the soil losses, 3.6 t/ha vs. 97.8 t/ha in 2013; in these condition the covering vegetation degree was of 96.67 the hillside with slope of 10% and matresses in comparison with 21.2%.
Authors and Affiliations
Radu Brejea
Keywords
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