In calcareous quarries, quarrying can occur in different spatio-temporal phases during a long time span (>10-15 years). The restoration performed during subsequent times of the quarry exploitation, may have different costs and success in terms of soil and biodiversity recovery. From the 2000s, the NW sectors of the Colle Pedrino quarry have been exploited in subsequent temporal phases. The abandoned slopes of the quarry were subject to sequential revegetation actions carried out by different companies, using dissimilar seed mixes on soil substrates deriving from quarry waste material. The aim of this project is to evaluate the success of the different restoration phases at Colle Pedrino, in terms of costs, edaphic environment and biodiversity recovery, compared with the surrounding natural areas. We will take into account: the materials and techniques used in the different recovery phases (soil substrate, seed mixes, etc.). A specific aim is to assess the suitability of the plants, growing in the quarry surrounding, to be used as hayseed for the quarry revegetation. We will use a stratified sampling following the revegetation age of the restored parcels (3x3 m plots). At the end of the project, the cost-benefits of the different restoration actions performed over time will be assessed: costs, edaphic environment and biodiversity. This will allow a cost optimization for the quarry restoration, with a creation of a stable vegetation cover and increased biodiversity levels.

Vegetation survey on quarry sites / Il rilievo della vegetazione nei siti di cava

IT: La vegetazione ed la composizione floristica dei siti recuperati all'interno di una cava variano in fuzione del tempo di recupero e delle variabilità ambientale presenti tra i siti investigati. EN: The vegetation and floristic composition of the sites recovered inside a quarry vary depending on time of recovery and on environmental variability between the investigated sites .

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Una fase cruciale del progetto: l'analisi del suolo / A crucial phase of the project: soil analysis

IT: Nei progetti di recupero delle cave, un aspetto importante, spesso sottovalutato, sono le analsi pedologiche, che prevedono di studiare sia i caratteri fisici, sia quelli chimici del suolo presente sui versanti da recuperare. EN: In quarry restoration projects, an important aspect, often underestimated, is soil analysis, which implys the study of both the physical and chemical characteristics of the soil present on the slopes to be recovered.

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Il fiorume autoctono per il recupero di Colle Pedrino/ Native hayseed for Colle Pedrino restoration

IT: L’impiego di fiorume autoctono (mix di sementi ricavate da sfalci di prati locali) consente di realizzare inerbimenti delle scarpate di cava con materiale di pregio per favorire la biodiversità dell’area. EN: The use of native flowers (i.e. hayseed) makes possible to cover the quarry slopes with valuable plant material to promote the recovery of local biodiversity.

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