Background and purpose: Timber-oriented forest management has an important impact on biodiversity in forest ecosystems. Recovery dynamics of two groups of beetles (Coleoptera: Carabidae, Staphylinidae) were studied after reforestation with native English oak (Quercus robur). We expected that reforestation with heavy site preparation causes a shift in the diversity of surface-dwelling beetles in early phases of reforestation. Moreover, we tested the habitat specialist hypothesis, assuming that diversity of forest specialist species will be lower in early phases with open canopy than later phases of reforestation after the canopy closure.
Materials and methods:We compared litter sifter samples among mature (130-year-old) oak forest, and recently established (5-year-old), young (15-year-old), middle-aged (45-year-old) reforestations.
Results: Our results showed that diversity of ground beetles was the highest in the recently established reforestation, while it was the lowest in the mature oak forest. Contrarily, diversity of rove beetles was the lowest in recently established reforestation and it was the highest in the mature oak forest. In agreement with the habitat specialist hypothesis, the diversity of forest specialists of both taxa was lower in the recently established reforestation than in the young and middle-aged reforestations as well as mature forest.
Discussion: Our results suggested that clear-cutting of mature forest, site preparation before reforestation and cultivation by light tilling in early phases of reforestation have detrimental effects on forest specialist rove beetles and ground beetles. However, reforestation with native species could be a feasible management method in pannonic mesophile sand steppe, because forest specialist species can recover after the canopy closure.IntRoductIon T imber-oriented forest management has a crucial impact on the structure and function of forest ecosystems. It also has a harmful effect on biodiversity, as several groups of animals, fungi, and plants are sensitive to anthropogenic disturbance and environmental changes (1, 2). The cover of planted and naturally regenerated forests with human interventions accounted for 64 percent of the world's forest area in 2010, while cover of primary forests has been steadily decreasing since 2000 (3 to halt biodiversity loss and promote sustainable management, and have included in the Natura 2000 network (4). In spite of these measures the designated forest area for conservation of biodiversity was still 4.6 percent of European forests in 2015 (5).During forest management there are important decisions; selection of tree species (native, non-native species), sustainable practices, such as even-aged (modified clearcutting, seed tree method and shelterwood harvesting) and uneven-aged (group selection, single tree selection) regeneration methods (2, 6). Well-chosen forest practices contribute to maintaining forest biodiversity, because these practices have less intensive and less harmful impacts on environment tha...