RESEARCHES REGARDING THE VEGETATION RECONSTRUCTION IN A FORMER BAUXITE QUARRY IN THE PADUREA CRAIULUI MOUNTAIN, ROMANIA

摘要

The paper is based on the researches carried out during 2005-2008 in the former bauxite quarry in Zece Hotare, the Bihor county. The bauxite exploitation stopped in 1998 and during 2004-2005 important works took place. An experiment with acacia trees and different variants of fertilisation were realised, too. The determinations regarding the lengths of the acacia plants emphasised the biggest increase in the variant with 6 kg manure/hole and N_(120)P_(120)K_(120) applied at the planting. In the experiment with spruce trees planted on the hill with and without works against erosion, the biggest plants annual increase was registered in the variant with works against erosion. The presence of the natural vegetation incresead every year. The slope (10, 20, 31, and 44% with mattresses and of 44% without mattresses) had a very big influence on the installation of the herb natural vegetation. On the smallest slopes the vegetation (Calamagrostis epigeios, Tussilago farfara, Fragaria vesca, Euphorbia cyparisias, Viola odorata, Taraxacum officinale, Polytrichum commune, Cirsium arvense) was more present. The wooden vegetation was represented by Salix alba and Betula pendula and by Fagus silvatica plants in the area near the forest of Fagus silvatica.