1,721,024 research outputs found
Schede per una Lista Rossa della Flora vascolare e crittogama italiana: Carex panormitana Guss.
No full textFloristic Inventory and Diversity of Urban Green Spaces in the Municipality of Assemini (Sardinia, Italy)
Full text linkUrban greenery is a key component of green infrastructure, contributing to environmental sustainability and urban well-being. Between 2019 and 2020, a comprehensive inventory of ornamental flora was conducted in Assemini (Sardinia, Italy), documenting 198 vascular plant taxa, including 155 exotic, 41 native, and 2 cryptogenic species from 65 families. Among the exotic species, most were neophytes (63%), and 14% were archaeophytes. In terms of life forms, scapose phanerophytes, with a tree-like growth habit, dominated (45%), while Mediterranean and American chorotypes were the most represented, each accounting for 21%. A total of 7356 plants were recorded, comprising trees (61.3%), shrubs (32.3%), and climbers (5.7%), belonging to 90 shrub, 89 tree, and 19 climber taxa. The highest number of plants was found in "Green Areas" and "Schools", which also exhibited the greatest biodiversity, with 136 different taxa each. The most planted species were Quercus ilex, Nerium oleander, and Olea europaea. The survey also identified 21 allergenic, 36 toxic, and 35 mechanically harmful species, primarily located in "Green Areas" and "Schools". Biodiversity analysis using the Shannon Index revealed significant diversity, with Fabaceae, Apocynaceae, and Fagaceae emerging as the most represented families. These findings highlight the importance of plant inventories in urban green space management for sustainable planning. Well-maintained green spaces can enhance ecological resilience, improve public health, and promote social cohesion in future urban developments
Temporal increase in the extent of Sardinian pine formations
Full text linkTemporal changes in the distribution range of plant communities and habitats should be considered for optimal conservation. However, this information is often lacking. In this research, we investigated the changes in the spatial distribution pattern of the plant communities characterised by the presence of three Mediterranean pines considered native or putative native to Sardinia (Italy), namely Pinus halepensis, P. pinaster, and P. pinea. We analysed historical and current aerial photographs to prepare maps of the past and current distribution of natural pine formations, complemented with the aid of pine-related toponymy maps and interviews with local people. We calculated how the surface of natural pine formations varied across time, and found a high rate of recovery during the last decades. This rate is doubled when compared to the average extent of other Sardinian woody formations in the same period. Among the three pine species, the area of P. halepensis and P. pinaster formations increased the most. We also found that about 90% of pine formations fall within protected areas. More than 128 ha of natural pine formations are included in the priority habitat 2270, while those included in habitat 9540 cover 1100 ha. Our study provides a complete survey of the distribution of natural Sardinian pine formations, along with the quantification of their increase in the last decades, thus highlighting the importance of diachronic analyses for monitoring spatial changes in plant communities. We suggest considering the trends in the extent of vegetation formations and habitats for conservation purposes
Classification of the Sardinian pine woodlands
No full textMediterranean pine woodlands are one of the most common wooded vegetation types across the Mediterranean Basin and are included in two habitats of European interest as they have great conservation importance. We studied the woodlands of the class Pinetea halepensis dominated by Pinus halepensis, P. pinaster, and P. pinea in Sardinia (Italy) with the aim to clarify their syntaxonomic position. We compiled a dataset of 66 original vegetation releves, complemented with the holotypes of similar vegetation types formerly described for Italy and Corsica (France). We classified P. halepensis woodlands, native to the Island of San Pietro, to the association Erico arboreae-Pinetum halepensis. We classified P. halepensis woodlands growing on limestones of the south-western coast of Sardinia to the new association Smilaco asperae-Pinetum halepensis and woodlands typical of coastal dunes to the new association Asparago horridi-Pinetum halepensis. We also described the north-eastern Sardinia P. pinaster woodlands as the new association Arbuto unedonis-Pinetum pinastri, of which we recognised two new subassociations, typicum and cephalantheretosum longifoliae, ecologically distinguished by the xerophilous and mesophilous conditions, respectively. Furthermore, we classified P. pinea woodlands, putatively native only to stabilised sand dunes of south-western Sardinia, in the new association Querco calliprini-Pinetum pineae. This study represents the first complete survey and classification of Sardinian pine woodlands, allowing a better understanding of their ecology, floristic composition and differences with other Mediterranean pine woodlands
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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