Abstract:

Aims: Urban green spaces are crucial for biodiversity conservation, and university campuses, as microcosms of urban built environments, are crucial for enhancing the quality of micro urban green spaces and conserving biodiversity. However, existing studies on campus biodiversity often lack continuous spatial and temporal information, and fail to clarify the relationships between species and the internal structure of green spaces. This gap may hinder the optimization of small green spaces, ultimately limiting the achievement of targets set forth in the Kunming-Montreal Global Biodiversity Framework (KMGBF) and the China National Biodiversity Conservation Strategy and Action Plan (2023-2030).

Methods: This study focused on the bird species of Tsinghua University campus, employing generalized linear models and redundancy analysis to investigate the spatiotemporal patterns of bird distribution and analyze the associations between bird community composition and green space characteristics.

Results: The study revealed that birds in university campus green spaces exhibited concentrated distributions with seasonal variations. Bird community composition was associated with the woody food plants richness, shrub evenness, grass coverage, artificial grass coverage, and tree coverage. Among these factors, woody food plants richness promoted bird abundance, species richness, and diversity, while shrub evenness promoted bird richness and diversity. Tree and artificial grass coverage promoted bird abundance only when both are simultaneously below 37.5% and 39.8%, respectively. Grass coverage negatively impacted bird richness and diversity. Furthermore, different bird residency types displayed distinct habitat preferences: Migratory birds in autumn were solely associated with vegetation structure, whereas resident and winter visitors were jointly influenced by both the physical characteristics and vegetation structure of green spaces.

Conclusion: This study suggests that, when designing micro urban green spaces in alignment with natural principles, tree and artificial grass coverage should be kept below 40% simultaneously, while enhancing the woody food plants richness and shrub evenness. Additionally, increasing natural grass coverage and vertical vegetation is recommended. This study provides both quantitative and qualitative recommendations for creating near-natural micro urban green spaces, providing a scientific foundation for achieving the goals of KMGBF and the China National Biodiversity Conservation Strategy and Action Plan (2023-2030) in improving urban blue and green spaces quality.

Key words: biodiversity, micro urban green space, university campus, vegetation structure, conservation management