StatusThe thesis was presented on the 6 November, 2020
Approved by NCAA on the 23 December, 2020
Abstract– 1.09 Mb / in romanian
– 1.20 Mb / in english
8.80 Mb /
Introduction, 5 chapters, conclusions and recommendations, bibliography of 245 titles, 129 pages of text, 20 figures, 11 tables, 10 annexes. The obtained results are published in 27 scientific papers.
Field of study: Ecology. The aim: evaluation the peculiarities of restoration the petrophyte ecosystem in the limestone quarry of the factory „Lafarge Ciment” (Moldova) S.A.
Objectives: estimation of the initiation stage and natural restoration of biodiversity on the overburden dumps surface in the limestone quarry „Lafarge Ciment” (Moldova) S.A.; assessment of the state and dynamics of biodiversity on the overburden dumps surface depending on their age; estimation of the dependence of the evolution degree of regosols, formed on the surface of overburden dumps in the process of the restoring the petrophyte ecosystems; ecological reconstruction through forestry recultivation of the recently stored dumps in the quarry.
Scientific novelty and originality. For the first time in the Republic of Moldova, it was effectuated the study of the natural restoration of the petrophyte ecosystems and established the regularity of the regosols formation on the overburden dumps surface. This regularity demonstrates that the degree of regosols forming, represents a process of soil evolution depending on the age of the dumps, the number of species that grow on their surface, the content of nutrients and the humus formed in regosol, assured by the mass of the developed species on the overburden dumps surface, as the results of the biogeochemical process (phytocenotic). It was developed and implemented the experimental method of forest recultivation of the petrophyte ecosystem from the quarry „Lafarge Ciment” (Moldova) S.A.
The originality of the results consists in the complex study of the dynamics of natural process of biodiversity initiation and restoration, of soil formation, nutrients accumulation (Ntotal, P2O5, K2O), of humus in the newly formed soil layers on the overburden dumps surface (soil layer 0–20 cm) and conditions that ensure the restoration of the quarry petrophyte ecosystem.
Solved scientific problem consists in establishing the stages of natural restructuring of the petrophyte ecosystem, based on the diversity of the phenomena being explained. This process represents consecutiveness and reciprocal interaction of the natural stages of biodiversity development, of soil formation, nutrients accumulation and humus formation in regosols, that take place simultaneously, without human intervention, and assures natural restoration of petrophyte ecosystem.
The theoretical importance. The research is a first experience, at national level, on elucidating the stages of biodiversity restoration and establishing the regularity of the soil formation process on the surface of overburden dumps. The results indicate that the process of biodiversity restoring and regosols formation on the overburden dumps surface are interdependent.
The practical value. For the first time, the method of ecological reconstruction through forest recultivation on recently stored land, without organic fertilizers was used, and an ecosystem with a high index of development of plant biological diversity was obtained. The results of the complex study will serve as a basis for restoration of degraded ecosystems after mining activities in limestone quarries.
Implementation of scientific results. The research results are implemented by the Sustainable Development Department of the factory „Lafarge Ciment” (Moldova) S.A. in order to achieve ecological reconstruction by forestry recultivation of overburden dumps and by the State University of Moldova in the process of training master's and doctoral students.