Beautiful and Useful: Species Richness and the Ecosystem Services of Allotment Gardens in Berlin, Germany.

Intensive agriculture and urbanization have led to habitat degradation and fragmentation, reducing plant diversity and subsequently reducing pollinator abundance and richness. This paper investigates the conservation potential of green infrastructure in allotment gardens, which are a common form of urban land use. This exploratory study examines allotment plant species richness by functional use groups in allotment gardens across Berlin, as well as its impact on ecosystem services, such as providing pollinator habitats through multifunctional plants that are edible, ornamental, and nectar-producing. Additionally, we highlight the potential role of allotment gardens in providing citizens with locally produced food by evaluating the plant species richness of food plants in these gardens. The study was conducted in allotment gardens in Berlin between Мау and July 2019 and focused on comparative analyzes of plots with high (5) and medium (4) management intensity, while the single low-intensity plot was included only to assess overall biodiversity across all studied garden plots (10). Plant species were identified and classified into functional groups, including edible species, ornamental species, weed species also used as ornamentals, and edible species also used as ornamentals or medicinal plants, as well as into life forms such as herbs, trees, shrubs, and vines. Management intensity was assessed through field observations and by verifying the frequency of lawn mowing and hedge trimming with gardeners. During the study, 376 plant species were identified, 17 of which were included in the list of recommended native plant species for Berlin, while 14 were invasive species. The Wilcoxon rank-sum test showed that native species richness (