Month: June 2014
Il WWF organizza un ciclo di incontri presso la nuova sede alle ex Serre di via Tommaso da Cazzaniga (interno dei giardini comunali; metro 2, Moscova).
MARTEDÌ 1 LUGLIO
Presentazione del libro
“Il libro nero dell’Agricoltura”
(Ed. Ponte alle Grazie, 2012)
Quale agricoltura ci nutrirà?
Un importante interrogativo, soprattutto in questo momento in cui la nostra città si avvicina a Expo. L’agricoltura deve essere ripensata per soddisfare i bisogni di una popolazione mondiale in crescita e diventare allo stesso tempo uno strumento di riscatto sociale ed economico, nel rispetto dell’ambiente.
L’evento è organizzato da WWF Lombardia e Associazione Nostrale.
WWF Italia ONG ONLUS
Via Tommaso da Cazzaniga snc
Urbanization is increasing worldwide, relatively few studies have investigated patterns of urban biodiversity outside of city parks and reserves, in urban neighborhoods where people live and work. We evaluated models including local and landscape factors that might influence the bee and butterfly richness of community gardens located within densely populated neighborhoods of the Bronx and East Harlem in New York City (>10,000 people/km2). The gardens were surrounded by buildings and amounts of green space (3,600–17,400 building units and 10–32% green space within a 500 m radius). Contrary to our initial prediction that landscape green space might be especially influential in this heavily urbanized setting, the most highly supported models for both bee and butterfly richness (based on Akaike Information Criterion) included just the local, within-garden variables of garden floral area and sunlight availability. There was marginal support for models of bee richness including the number of building units surrounding gardens within a 500 m radius (which exhibited a negative association with bee richness). In addition, perhaps because bees are central place foragers that may nest within. Or near gardens, supported models of bee species richness also included total garden area, canopy cover, and the presence of wild/unmanaged area in the garden. Generally, our findings indicate that sunlight and floral abundance are the major factors limiting local pollinator diversity in this setting. This suggests that rooftop and other “open” urban habitats might be managed to increase local pollinator diversity, even if seemingly “isolated” within heavily developed neighborhoods.
READ MORE: http://www.fordhamcue.com/articles/Matteson%20and%20Langellotto%202010.pdf
We describe the richness, abundance, and ecological characteristics of bees in community gardens located in heavily developed neighborhoods of the Bronx and East Harlem, NY. In total, 1,145 individual bees, representing 54 species (13% of the recorded New York State bee ) were collected over 4 yr. The nesting habits of these species include bees that nest in cavities (33% of species), hives (11% of species), pith (1.9% of species), wood (1.9% of species), or soft/rotting wood (7.4% of species) substrates. Soil-nesting individuals were relatively rare (25% of individuals), perhaps due to a lack of proper soils for nesting sites. Parasitic species were scarce (5.6% of species, 2.6% of individuals), most likely because of an absence or rarity of host species. Overall, exotic species were abundant and constituted 27% of the total individuals collected and 19% of the identi?ed species. We compare these results to several bee faunal surveys inNewJersey andNewYork State, including newly reported species lists for Central Park and Prospect Park in New York City. Relative to other studies, bee richness of the urban gardens is reduced and composition is biased toward exotic and cavitynesting species. Nevertheless, despite their small size and location within highly urbanized areas, urban community gardens harbor a diverse assemblage of bees that may provide pollination services and opportunities for ecological exposure and education.
1 – Hacer una abertura en la botella de 7 a 10cm para cada semilla.
2 – Llenar la botella con tierra abonada.
3 – Perforar la parte inferior de las botellas para favorecer el drenaje.
4 – Poner las botellas en las ondulaciones del techo (si es de chapa)
5 – Colocar el tubo sobre la botella para el riego
6 – Conectar los tubos a un balde (puede ser de 20Lt.) que esté sobre su altura.
7 – Sembrar las semillas en la tierra y darle el riego adecuado regulando con canillas.
Esta idea fue implementada a partir de un proyecto realizado por Carolina Forero, de la Universidad Javeriana, como una solución para un barrio en Altos de Cazucá, una comunidad con falta de agua potable.
Mediante una serie de talleres, Forero y su nueva socia enseñaron a la gente de la comuna a cultivar lechugas y rábanos en sus techos usando botellas PET de dos litros y agua lluvia recolectada en baldes.
more info: http://www.labioguia.com/como-hacer-un-ecotecho/