Perceptions of urban green infrastructures for climate change adaptation in Lausanne, Switzerland: unveiling the role of biodiversity and planting composition

Abstract

This interdisciplinary study addresses the gap in understanding the perceptions of individuals regarding the role of urban green infrastructures (UGIs) in climate change adaptation, particularly with respect to biodiversity and planting composition. While climate-responsive design strategies commonly focus on increasing permeable green spaces and canopy coverage, the explicit consideration of biodiversity remains limited. By introducing a novel analytical framework, we investigate how residents in Lausanne, Switzerland, assess the impact of biodiversity and planting composition on the potential of UGIs to adapt cities to climate change. Through a questionnaire-based survey (N = 527) and the use of photomontages and statistics, we examine the perceived potential of biodiverse versus uniform planting compositions to address climate change adaptation in Lausanne. Our findings demonstrate that respondents perceive biodiverse planting compositions as more successful strategies, attributing greater importance to trees in adaptation efforts, while overlooking the contributions of biodiverse herbaceous and shrub strata and soil permeability. Additionally, site characteristics associated with specific urban conditions significantly influence these perceptions. This evidence is subsequently discussed in two ways. Firstly, our analytical framework contributes to assessing the potential of UGIs in climate change adaptation, shedding light on the significance of planting composition. Secondly, the research emphasizes the need to transition from conventional climate-responsive approaches to more nuanced and sensitive methodologies that consider the multifaceted aspects of biodiversity. Such an approach holds promise for advancing the understanding of UGIs in climate change adaptation and informs future research directions.