1,721,014 research outputs found
Analysis of the relationship between landscape heterogeneity and wildfires distribution: evidence of selective burning in Sardinia (Italy)
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L’impatto del Global Change sulle praterie della riserva di Konza (Kansas, USA)
No full textIn questo lavoro è presentato uno studio relativo all’impatto del cambiamento climatico
globale (Global Change) sulle praterie ad alte erbe della riserva naturale di Konza (Kansas,
USA). Per mettere in luce la risposta sinfenologica della vegetazione ai cambiamenti climatici,
una serie temporale di immagini NOAA NDVI relativa al periodo 1989-2001 è stata
messa in relazione ai dati pluviometrici dello stesso periodo, e successivamente analizzata
in termini di autocorrelazione spaziale. I risultati ottenuti evidenziano un sensibile prolungamento
della stagione vegetativa telerilevata accompagnato da una progressiva riduzione
della continuità orizzontale della produttività primaria di queste praterie
Il regime degli incendi in Sardegna in relazione al timing sinfenologico della vegetazione
No full textIl regime degli incendi in Sardegna in relazione al timing sinfenologico telerilevato della vegetazione naturale potenziale
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A satellite-based green index as a proxy for vegetation cover quality in a Mediterranean region
No full textTo Grow or to Sprawl? Land Cover Relationships in a Mediterranean city region and implications for land use management
No full textSeveral Mediterranean cities underwent important morphological changes in the last century. This article deals with the transition from compact towards dispersed urban form and the consequent changes in Land Cover Relationships (LCRs) observed from 1960 to 2009 in Attica (Greece), a mono-centric, dense city region. We analyzed the long-term spatial distribution of four basic land cover classes to test if the ‘compact growth’ observed up to early 1990s and the ‘sprawl’ observed afterwards differently affect LCRs. Descriptive statistics, correlation analysis and multivariate procedures were used to verify this hypothesis. Results put in evidence similarities and differences in Land Cover Changes (LCCs) and LCRs observed during the two urban phases. Per-capita built-up area was found significantly higher in the ‘sprawl’ than in ‘compact growth’ phase. Cropland was the land cover class with the highest probability to undergo edification in both periods, but a significant conversion rate from forests towards cropland and pastures (in turn converted into built-up areas) was also observed in the ‘sprawl’ phase. This may be considered an indirect effect of urbanization due to sprawl-driven land fragmentation and recurrent fires induced by illegal housing and land speculation. We finally discussed how the changing LCRs may represent, at regional scale, a possible target for policies mitigating land consumption in ‘shrinking’ Mediterranean cities
Cambiamenti ambientali, processi socioeconomici e degrado delle terre: un approccio regionale
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