The Latent Relationship Between Soil Vulnerability to Degradation and Land Fragmentation: A Statistical Analysis of Landscape Metrics in Italy, 1960-2010.

Land degradation leads to almost unpredictable spatial outcomes and environmental dynamics demanding a more integrated monitoring approach. In this framework, we debate on (apparent and latent) connections between land fragmentation and soil degradation by identifying areas with increased levels of soil degradation that underlie distinctive spatial trends of land fragmentation. Moving from land-use maps to an empirical study of desertification, the framework proposed in this work may support environmental monitoring and inform land conservation policies. To assess land fragmentation, a quantitative approach grounded on a comprehensive analysis of landscape metrics available in FRAGSTATS package was illustrated and applied to Italy as a representative case of complex landscape dynamics in the Mediterranean basin. The Environmental Sensitive Area methodology was adopted to monitor the level of soil vulnerability to degradation. Three classes of land vulnerability-unaffected, fragile and critical-were identified and analysed using metrics to investigate possible links between soil degradation and land fragmentation. During the study period (1960-2010), Italy evolved towards a more fragmented landscape, characterised by increasingly smaller and contiguous patches, heterogeneous land-use structures and more irregular patches. We also introduced concepts focusing on syndromes of soil degradation characterised by a variety of attributes that correlate with land fragmentation. The present study makes an important contribution towards an operational system for identifying areas at risk of desertification. Analysis of land fragmentation as a proxy of soil degradation allows the characterisation of general landscape changes and identification of place-specific patterns associated with spatio-temporal dynamics leading to higher risk of desertification.

The effect of river damming on vegetation: is it always unfavourable? A case study from the River Tiber (Italy).

River damming leads to strong hydromorphological alterations of the watercourse, consequently affecting river vegetation pattern. A multitemporal and spatial analysis of the dam effect on composition, structure and dynamic of the upstream vegetation was performed on Tiber River at Nazzano-dam (Rome). The main research questions were as follows: How does plant landscape vary over time and along the river? Where does the dam effect on vegetation end? How does naturalistic importance of the vegetation affected by damming change over time? Data collection was performed mapping the vegetation in aerial photos related to the period before (1944), during (1954) and after dam construction (1984, 2000). The plant landscape has significantly changed over time and along the river, particularly as a result of the dam construction (1953). The major vegetation changes have involved riparian forests and macrophytes. Dam effect on vegetation is evident up to 3 km, and gradually decreases along an attenuation zone for about another 3 km. Despite the fact that the damming has caused strong local hydromorphological modification of the river ecosystem transforming it into a sub-lacustrine habitat, it has also led to the formation of wetlands of considerable naturalistic importance. Indeed, in these man-made wetlands, optimal hydrological conditions have been created by favouring both the expansion of pre-existing riparian communities and the rooting of new aquatic communities, albeit typical of lacustrine ecosystems. Some of these plant communities have become an important food resource, refuge or nesting habitats for aquatic fauna, while others fall into category of Natura 2000 habitats. Therefore, river damming seems to have indirectly had a "favourable" effect for habitat conservation and local biodiversity.

Complexity in action: Untangling latent relationships between land quality, economic structures and socio-spatial patterns in Italy.

Land quality, a key economic capital supporting local development, is affected by biophysical and anthropogenic factors. Taken as a relevant attribute of economic systems, land quality has shaped the territorial organization of any given region influencing localization of agriculture, industry and settlements. In regions with long-established human-landscape interactions, such as the Mediterranean basin, land quality has determined social disparities and polarization in the use of land, reflecting the action of geographical gradients based on elevation and population density. The present study investigates latent relationships within a large set of indicators profiling local communities and land quality on a fine-grained resolution scale in Italy with the aim to assess the potential impact of land quality on the regional socioeconomic structure. The importance of land quality gradients in the socioeconomic configuration of urban and rural regions was verified analyzing the distribution of 149 socioeconomic and environmental indicators organized in 5 themes and 17 research dimensions. Agriculture, income, education and labour market variables discriminate areas with high land quality from areas with low land quality. While differential land quality in peri-urban areas may reflect conflicts between competing actors, moderate (or low) quality of land in rural districts is associated with depopulation, land abandonment, subsidence agriculture, unemployment and low educational levels. We conclude that the socioeconomic profile of local communities has been influenced by land quality in a different way along urban-rural gradients. Policies integrating environmental and socioeconomic measures are required to consider land quality as a pivotal target for sustainable development. Regional planning will benefit from an in-depth understanding of place-specific relationships between local communities and the environment.