This is the aim of the Villegarden national research programme, which seeks to gain a better understanding of the contribution made by these spaces and their (as yet poorly understood) role in the transition towards biodiverse and permeable cities. The programme covers seven major French cities and metropolitan areas (including the Greater Nancy metropolitan area), which will provide a comprehensive and comparative overview of the situation across different regions.

Following the first field survey in March, which focused in particular on collecting soil samples for biophysical and chemical analysis, the second survey, currently underway, will provide an overview of the botanical composition (and diversity) of the various sites.

An assessment of soil microfauna abundance has also been carried out, along with recordings of birdsong and the collection of questionnaires from landowners and residents.

The various analyses should enable researchers to gain a better understanding of these areas, which have rarely been studied to date. They will make it possible to assess: 

• the environmental performance of residential green spaces,
• the social and environmental factors that influence it, and
• a comparison of the findings with current urban planning documents.

Ultimately, the researchers will use their findings and expert advice to inform public policy and urban management, particularly in the context of urban biodiversity and climate resilience policies.