Search results for "Geta"

Modeling the role of climate change on small-scale vegetation patterns in a Mediterranean basin using a Cellular Automata model

2013

Predicting vegetation response in regions of ecotone transition under a changing climate is a among grand challenges in ecohydrology. In a small basin (1.3 sq km) in Sicily, Italy, where north-facing slopes are characterized by Quercus (tree), and south-facing slopes by Opuntia ficus-indaca (evergreen perennial species drought tolerant) and grasses we use an ecohydrological Cellular-Automaton model (CATGraSS) of vegetation coexistence driven by rainfall and solar radiation with downscaled future climate to examine the role of climate change on vegetation patterns. In the model, each cell can hold a single plant type or can be bare soil. Plant competition is modeled explicitly by keeping tra…

Multi-temporal analysis of MODIS Land Products over the Amazon region

2012

In a global warming scenario there is an increase interest in examining climate trends at specific biomes such as the tropical rainforest biome. The Amazonian region is the largest carbon sink, so changes in this area are expected to have a direct impact over the climate change. In this work we analyse the temporal evolution (trends and anomalies) of different land parameters from 2001 to 2010 over the Amazonian forest. For this purpose, we used Moderate Resolution Imaging Spectroradiometer (MODIS) Land Products at 0.05° latitude/longitude Climate Modeling Grid (CMG), namely, combined Terra/Aqua 16-day Albedo (MCD43C3), Terra monthly Land Surface Temperature & Emissivity (MOD11C3), Terra mo…

Variability Among Italian Citrus tristeza virus Isolates Revealed by SSCP Analysis, Cloning and Sequencing

2005

Soil water content monitoring: a verification of thermal inertia approaches on low spatial, high temporal resolutions images

2013

Soil water content is directly connected with soil evaporation and plant transpiration processes; in particular, soil water content within the root zone, is readily available to evapotranspiration. Thus, in agricultural sciences, the assessment of the spatial distribution of soil water content could be of utmost importance in evaluating crop water requirement. In spite of limitations to applicability due to contingent cloud cover, water content of the upper part of the soil can be determined by applying the thermal inertia approach by coupling optical and thermal infrared images. The thermal inertia formulation, rigorously retrieved on bare soil, has been also verified on soils partially co…

Critical analysis of the thermal inertia approach to map soil water content under sparse vegetation and changeable sky conditions

2012

The paper reports a critical analysis of the thermal inertia approach to map surface soil water content on bare and sparsely vegetated soils by means of remotely sensed data. The study area is an experimental area located in Barrax (Spain). Field data were acquired within the Barrax 2011 research project. AHS airborne images including VIS/NIR and TIR bands were acquired both day and night time by the INTA (Instituto Nacional de Tecnica Aeroespacial) between the 11 th and 13 rd of June 2011. Images cover a corn pivot surrounded by bare soil, where a set of in situ data have been collected previously and simultaneously to overpasses. To validate remotely sensed estimations, a preliminary prox…

Bioaccessibility and decomposition of cylindrospermopsin in vegetables matrices after the application of an in vitro digestion model.

2018

Research on the human exposure to Cylindrospermopsin (CYN) via consumption of contaminated food is of great interest for risk assessment purposes. The aim of this work is to evaluate for the first time the CYN bioaccessibility in contaminated vegetables (uncooked lettuce and spinach, and boiled spinach) after an in vitro digestion model, including the salivar, gastric and duodenal phases and, colonic fermentation under lactic acid bacteria. The results obtained showed that the digestion processes are able to diminish CYN levels, mainly in the colonic phase, especially in combination with the boiling treatment, decreasing CYN levels in a significant way. Moreover, the potential decomposition…

Seed population dynamics on badland slopes in southeastern Spain

1995

6 páginas, figuras, tablas.

A comparison of STARFM and an unmixing-based algorithm for Landsat and MODIS data fusion

2015

article i nfo The focus of the current study is to compare data fusion methods applied to sensors with medium- and high- spatial resolutions. Two documented methods are applied, the spatial and temporal adaptive reflectance fusion model (STARFM) and an unmixing-based method which proposes a Bayesian formulation to incorporate prior spectral information.Furthermore, thestrengths of both algorithms arecombined ina novel data fusionmethod: the Spatial and Temporal Reflectance Unmixing Model (STRUM). The potential of each method is demonstrated using simulation imagery and Landsat and MODIS imagery. The theoretical basis of the algorithms causes STARFM and STRUM to produce Landsat-like reflecta…

Primi studi su Biscogniauxia mediterranea in Sicilia occidentale

2009

È stata condotta un’indagine su un diffuso deperimento delle querce, all’interno di un’area della riserva naturale orientata “Bosco della Ficuzza, Rocca Busambra, Bosco del Cappelliere e Gorgo del Drago”, nelle contrade Pulpito del Re e S. Barbara (Corleone, PA). Campioni di organi sinto-matici e di strutture miceliari associate alle alterazioni sono stati sottoposti alle opportune analisi. I saggi di laboratorio hanno consentito di isolare colonie fungine identificate con metodi tradizionali e molecolari come appartenenti a B. mediterranea. Tali ceppi hanno mostrato una variabilità morfologica in relazione all’ospite e all’epoca stagionale. I saggi di inoculazione artificiale hanno evidenz…

Latifoglie in Sicilia: un laboratorio di casi fitopatologici

2009

Si riportano alcuni casi fitopatologici osservati su differenti latifoglie, in vari ambienti boschivi siciliani. Le indagini, in particolare, sono state rivolte all’isolamento e all’identificazione dei mi-crorganismi fungini associati alle alterazioni. In alcuni casi, inoltre, mediante saggi d’inoculazione artificiale, è stata valutata la loro eventuale patogenicità. Tra i numerosi taxa identificati, alcuni, noti come parassiti di debolezza, hanno mostrato una spiccata attitudine fitopatogena su ospiti sani e stressati. Gli studi condotti, evidenziando l’incidenza e la severità di alcune malattie, accertano un generale stato di sofferenza delle latifoglie forestali, dovuto, probabilmente, a…