Search results for "Pinus"
showing 10 items of 159 documents
The effects of land abandonment and long-term afforestation practices on the organic carbon stock and lignin content of Mediterranean humid mountain …
2019
Afforestation is an important strategy that can decrease atmospheric carbon by sequestering carbon in biomass and soil. In Spain, an active afforestation programme was adopted in the 1950s when the soil was severely eroded after widespread abandonment of arable land. The Araguás catchment (Central Spanish Pyrenees) is a good example of this programme because it was afforested with both Pinus sylvestris L. (PS) and Pinus nigra J.F.Arnold (PN). The soil organic carbon (SOC) stock and lignin content (based on the vanillyl, syringyl and cinnamyl contents) of these afforested soils were examined and compared to those of bare soil, secondary succession and meadow soils. Both the SOC stock and lig…
Analisi dendrocronologiche nel sito Natura 2000 “Pineta di Linguaglossa”
2008
Dendrochronology is based on the tree’s characteristic to register in their xylem, the environmental conditions in which they live. The influence of climate, soil movements and modifications, volcanic eruptions, insect attacks etc, determine ring width and further xylem morphological elements (cell lumen, density, latewood and earlywood width etc.). Tree rings may be used as proxy records. According to this assumption, the correlation between tree rings and environmental factors may be transposed back in time using long chronologies, in order to reconstruct specific environmental conditions such as climate, hydrological fluctuations, ice movements etc. The aim of the project Managmned is to…
1200-yr high-resolution terrestrial climate archive from the middle of the Mediterranean: The sedimentary record from Lake “Specchio di Venere” on Pa…
2011
The special location of Lake "Specchio di Venere" on Pantelleria Island in the Sicily Channel (Mediterranean Sea) between Tunisia and Sicily offers a unique terrestrial archive recording atmospheric changes, which are otherwise difficult to decipher in the marine records from this area. The lake is an endorheic saline basin with a maximum depth of 12.5 m. As the water input depends on rainfall, precipitation variations influence changes of the lake's water chemistry. In summer 2008, Lake Venere was cored with a modified Livingstone corer revealing a composite sedimentary sequence of 10.29 m length. Two radiocarbon dates form a preliminary age model indicating a very high sedimentation rate …
I PROCESSI DI RINATURALIZZAZIONE DEI RIMBOSCHIMENTI A PINUS HALEPENSIS MILL. NELLA SICILIA OCCIDENTALE
2011
I pini monumentali della Fossa della Garofala.
2016
In città è difficile rinvenire alberi monumentali a causa delle negative interazioni tra le attività antropiche e la vegetazione. Lo sviluppo delle piante arboree assume un aspetto notevolmente differente rispetto a quello che si potrebbe avere in un ecosistema naturale. In una città come Palermo in cui la forte espansione urbanistica ha sottratto aree verdi rimangono solo alcuni lembi sopravvissuti alla cementificazione. Un caso particolare è rappresentato dalla Fossa della Garofala che, pur essendo inclusa all’interno del tessuto urbano, ha elevati caratteri di naturalità. Ciò è dovuto alla storia passata e recente, l’area acquisita dall’Università di Palermo nel 1950, grazie all’apposizi…
Primi dati sugli alberi monumentali di Pantelleria
2016
Poche o nulla sono le informazioni sugli alberi monumentali delle piccole isole che circondano la Sicilia. Ciò è dovuto innanzitutto alla rarità di alberi definibili monumentali, le piccole isole hanno subito infatti una trasformazione ancora più profonda della Sicilia, ma anche ad un difetto di conoscenza. Il nostro vuole essere un primo contributo alla conoscenza degli alberi monumentali nell’isola di Pantelleria. Gli alberi censiti appartengono a due specie, il pino marittimo (Pinus pinaster subsp. hamiltonii) e il leccio (Quercus ilex). In realtà nel caso del pino marittimo possiamo parlare di un “popolamento monumentale” corrispondente alla pineta a pino marittimo presso la località Mo…
Pine stand density influences the regeneration of Acacia saligna (Labill.) H.L.Wendl. and native woody species in a mediterranean coastal pine planta…
2018
Mediterranean plantations are the most suitable areas to assess vegetation dynamics and competitive interactions between native and exotic woody species. Our research was carried out in a coastal pine plantation (Sicily) where renaturalization by native species (Pistacia lentiscus L. and Olea europaea var. sylvestris) and invasion by Acacia saligna (Labill.) H.L.Wendl. simultaneously occur. The regeneration pattern of woody species in the pine understory was evaluated in six experimental plots along a stand density gradient, from 200 to approximately 700 pines per hectare. Both pine stand density and regeneration by native species had a significant negative relationship with Acacia natural …
Pinares y enebrales. El paisaje solutrense en Iberia
2013
Se presentan estudios antracológicos de yacimientos de la península Ibérica con el objetivo de conocer la flora durante el Solutrense y, a partir de ella, las condiciones termoclimáticas y ombroclimáticas. Con los datos publicados e inéditos se demuestra que los refugios de las especies más cálidas están al sur del paralelo 40º N. La flora identificada en los carbones se puede agrupar en cuatro categorías: criófilas, termófilas, matorral y ribera. Se observa un gradiente latitudinal de la distribución de los marcadores más térmicos como Pinus pinea, Rosmarinus officinalis, mientras que los pinos criófilos están distribuido por todas las regiones. Se propone la identificación botánica de los…
Le specie alloctone invasive in Sicilia: caratterizzazione del fenomeno, strategie di colonizzazione e possibili strategie di contrasto
2014
Adaptive radiation along a thermal gradient: preliminary results of habitat use and respiration rate divergence among whitefish morphs.
2014
Adaptive radiation is considered an important mechanism for the development of new species, but very little is known about the role of thermal adaptation during this process. Such adaptation should be especially important in poikilothermic animals that are often subjected to pronounced seasonal temperature variation that directly affects metabolic function. We conducted a preliminary study of individual lifetime thermal habitat use and respiration rates of four whitefish (Coregonus lavaretus (L.)) morphs (two pelagic, one littoral and one profundal) using stable carbon and oxygen isotope values of otolith carbonate. These morphs, two of which utilized pelagic habitats, one littoral and one …