647 research outputs found
Analisi della vegetazione dei noccioleti e dei castagneti nel territorio comunale di Visciano (Campania)
No full textAnalisi della dinamica della vegetazione dei Monti Erbano e Monaco di Gioia (Massicio del Matese)
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La flora della costa sabbiosa del Parco Nazionale del Cilento e Vallo di Diano (Salerno).
No full textThe flora of the beaches of the National Park of Cilento and Vallo di Diano has been assessed in order to have a complete and actual list of vascular species. A total of 302 entities has been recorded; comparing these results with the floristic data pubblished in papers referring to the same area, new species has been detected, but 44 previously recorded entities have not been confirmed. Concerning the new records, the presence of Anagallis arvensis L. subsp. parviflora (Hoffmagg. et Link) Cout., Datura innoxia Miller and Gazania rigens (L.) Gaertner resulted remarkable, being new records for the Campania region. According to the Mediterranean-type climate of the area, the flora showed a high percentage of both Steno- and Euri-Mediterranean species; very high resulted the percentage of Cosmopolitian entities (24,3% of the total) with a 4% coming from the surroinding crop areas. Few Endemic species have been recorded (1%) mainly due to the type of investigated habitats and also because of the presence of several anthropic activities mainly during summer time
Monitoraggio della Biodiversità floristica e dello stato del suolo in un sistema costiero mediterraneo
No full textNew distributional data of the rare endemic speciesEokochia saxicola(Guss.) Freitag and G. Kadereit (Chenopodiaceae): Effects on biogeography and conservation
No full textEokochia saxicola (Guss.) Freitag & G. Kadereit is a very rare endemic species of southern Italy and one of the rarest plants in Europe, included as priority species in the Annex II of the Council Directive 92/43/EEC. During the floristic surveys in the Cilento e Vallo di Diano National Park (Campania region, southern Italy), with the aim to assess the conservation status of rare and/or endemic species, new sites of occurrence of E. saxicola have been recorded representing the first known mainland sites; in fact, this endemic species was previously recorded only in the insular sites of Ischia (where it is extinct) and Capri in Campania region and Strombolicchio in Sicily region. Moreover, a further site was found in Capri island. So, three new sites of occurrence of E. saxicola have been recorded, increasing the total number from the two previously known to the actual five; in Campania, the total number increased from one to four. The research also increased significantly the global population size, currently made up of about 270 individuals compared with the 150 previously known. Consequences for the biogeography of the species and practical issues for conservation are discusse
Fluxes of N2O and CH4 from soils of savannas and seasonally-dry ecosystems
No full textAim: Savannas and seasonally-dry ecosystems cover a significant part of the world's land surface. If undisturbed, these ecosystems might be expected to show a net uptake of methane (CH4) and a limited emission of nitrous oxide (N2O). Land management has the potential to change dramatically the characteristics and gas exchange of ecosystems. The present work investigates the contribution of warm climate seasonally-dry ecosystems to the atmospheric concentration of nitrous oxide and methane, and analyses the impact of land-use change on N2O and CH4 fluxes from the ecosystems in question. Location: Flux data reviewed here were collected from the literature; they come from savannas and seasonally-dry ecosystems in warm climatic regions, including South America, India, Australasia and Mediterranean areas. Methods: Data on gas fluxes were collected from the literature. Two factors were considered as determinants of the variation in gas fluxes: land management and season. Land management was grouped into: (1) control, (2) 'burned only' and (3) managed ecosystems. The season was categorized as dry or wet. In order to avoid the possibility that the influence of soil properties on gas fluxes might confound any differences caused by land management, sites were grouped in homogeneous clusters on the basis of soil properties, using multivariate analyses. Inter- and intra-cluster analysis of gas fluxes were performed, taking into account the effects of season, land management and main vegetation types. Results: Soils were often acid and nutrient-poor, with low water retention. N2O emissions were generally very low (median flux 0.32 mg N2O m-2 day-1), and no significant differences were observed between woodland savannas and managed savannas. The highest fluxes (up to 12.9 mg N2O m-2 day-1) were those on relatively fertile soils with high air-filled porosity and water retention. The effect of season on N2O production was evident only when sites were separated in homogeneous groups on the basis of soil properties. CH4 fluxes varied over a wide range (-22.9 to 3.15 mg CH4 m-2 day-1, where the negative sign denotes removal of gas from the atmosphere), with an annual average daily flux of -0.48 ± 0.96 (SD) mg CH4 m-2 day-1 in undisturbed (control) sites. Land-use change dramatically reduced this CH4 sink. Managed sites were weak sinks of CH4 in the dry season and became sources of CH4 in the wet season. This was particularly evident for pastures. Burning alone did not reduce soil net CH4 oxidation, but decreased N2O production. Main conclusions: Despite the low potential for N2O production, both in natural and managed conditions, tropical seasonally-dry ecosystems represent a significant source of N2O (4.4 Tg N2O year-1) on a global scale, as a consequence of the large area they occupy. The same environments represent a potential CH 4 sink of 5.17 Tg CH4 year-1. However, assuming that c. 30% of the tropical land is converted to different uses, the sink would be reduced to 3.2 Tg CH4 year-1. The limited information on fluxes from Mediterranean ecosystems does not allow a meaningful scaling up. © 2006 Blackwell Publishing Ltd
The Flora of the lakes Corree and Vairano (Caserta, Italy)
No full textTwo ponds located in the middle Volturno plain, NE of the Roccamonfina volcanic complex (province of Caserta, Campania), have been investigated to describe their flora. The results report the presence of 131 species in the lake Corree and 125 in the lake Vairano. Comparison with ancient data highlights the loss of aquatic species considered as rare, endangered or extinct in Campania
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