STUDY REGARDING THE ECOPEDOLOGICAL CONDITIONS OF LANDS DEGRADED BY MINING ACTIVITIES FROM RECEA QUARRY, BIHOR COUNTY PUBLISHED

Ionel GAICA, Mădălina IORDACHE, Iacob BORZA, Florin CRISTA
The study area is a small area of land around the village Şuncuiuş. The sterile waste dumps, once under the influence of external natural modulating factors, tend to create hydro-geological systems with specific shapes and dynamics that evolve more or less rapidly due to their particular characteristics, influencing the odds of foresting activities. The mining activity within perimeter of Recea quarry led to profound changes of the relief resulting in geo-mechanical (landslides, compactions), pedological, agrochemical and biological changes. By estimating the impact of sterile dumps on environmental factors, several aspects have been revealed: the initial destination (forest) of lands has been changed and these have been used for storage of the mining waste, relief has been changed, instead of the stable forest associations, balanced and productive, appeared very poor and sporadic associations of ruderal herbaceous plants. The sterile dumps have been studied especially under textural and agrochemical aspects, being performed measurements regarding soil reaction, degree of nitrogen, potassium, phosphorous supply, humus content, content of soluble salts. The natural flora existing on surfaces which have been affected by mining activities was completely destroyed and on these surfaces was installed a new vegetation but in a different from baseline. On the studied dump have been identified 29 species, 28 genera and 16 families. Family of Asteraceae (Compositaceae) with 9 species is the most representative. The other families are represented by 1-3 species. The dominant plant life forms were: hemicryptophytes (44,83%), followed by annual therophytes (17,24%), and megaphanerophytes (13,79%). The other categories are low represented The initial (construction) stability of the waste dumps is the most important factor in the rehabilitation process.
degraded land, mining activity, sterile dumps, vegetation, plant life forms, geoelements.
Presentation: oral

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