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Relation between plant species diversity and landscape variables in Central-European dry grassland fragments and their successional derivates
Igor Paušič, Danijel Ivajnšič, Mitja Kaligarič, Nataša Pipenbaher, 2017, original scientific article

Abstract: A systematic field survey of an area of 843 ha in the traditional Central-European agricultural landscape of Goričko Nature Park in Slovenia revealed 80 fragments of dry semi-natural grasslands. Vascular plant species diversity was studied in relation to landscape variables and to threat (Slovenian red-listed species). Our results show that fragment size does not affect plant species diversity. In addition, fragment shape index is not related to Alpha diversity. Higher Alpha diversity was observed for abandoned grassland fragments. The lowest Alpha diversity was perceived on more mesic fragments, where habitat specialists are much scarcer. It was confirmed that the highest diversity of specialists are in the driest fragments, both still mowed and abandoned. With an increase in the number of distinctly different bordering habitat types, the total number of species per fragment generally does not increase, except in the case of those fragments that are already in different succession stages. Abandoned and typical dry grasslands are associated with a higher number of bordering habitats. Typical dry grassland fragments and abandoned ones, which probably derived mostly from drier (less productive) grasslands, are found on lower altitude and have a lower shape index. Habitat specialists Sedum sexangulare, Polygala vulgaris and Spiranthes spiralis have higher frequency in fragments with a lower shape index. This means that these oligotrophic specialists occur in smaller fragments. But Orchis morio has higher frequencies of occurrence on polygons with a higher shape index, which confirms the observation that this species occurs in larger and more irregular fragments, as well as close to houses and fields and along the roads.
Keywords: habitat specialists, traditional agricultural landscape, semi-natural dry grasslands, Goričko Nature Park, NE Slovenia
Published in DKUM: 24.10.2017; Views: 1266; Downloads: 400
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Traditional agricultural landscape in Goričko Landscape Park (Slovenia) : distribution and variety of riparian stream corridors and patches
Mitja Kaligarič, Jožef Sedonja, Nina Šajna, 2008, original scientific article

Abstract: Goričko Landscape Park is a well-preserved example of typical Central-Europeanagricultural landscape. We used modified PHYSIS typology to describe and classify different habitat types (HT), especially the riparian stream corridors and patches (RSCP)-habitats of riparian woody stands occurring outside the closed woodland. The RSCP of Goričko were categorized into 107 HT, which cover 1.35% of the 45,000 ha in Goričko. The ash-alder vegetation is the most widespread riparian HT. For the detailed analysis, we compared two similar areas that differ only in land-use intensity. RSCP showed slightly higher fractal dimension and significantly higher elongation index in more intensified area B. The analysis of RSCP types on these areas showed a shift, accompanying increased agricultural impact, from pure stands to mixed, from trees to scrub, from ash-alder and white willow stands to mixed riverine willow stands. The course of the intensification produced two results: arable HT were united into large, homogeneous polygons, while less usable land was abandoned. We can conclude that some of the landscape characteristics we used can be applied to detect the level of preserved traditional cultural landscape.
Keywords: Goričko Landscape Park, stream corridors, forest patches, habitat mapping, GIS
Published in DKUM: 07.06.2012; Views: 1756; Downloads: 109
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