Attila and Aetius on the roof: The succession phenomenon in the roof greening area of a primary school in Beijing during the lockdown period of the COVID-19

Abstract

"Succession" refers to the process of certain species replacing others over time. It is of great significance for understanding the characteristics and evolution of ecosystems. This article compares the changes in school rooftop green areas before and after the COVID-19 epidemic (2019, 2023), and studies the situation of wild grass invading roofs during the three years of the epidemic, as well as the response of original rooftop plants to the invasion. The results showed that: [circled1] invasive weeds were concentrated in 2 families and 4 species, forming a population advantage in most of the invaded planting boxes; [circled2] The succession has had a significant impact on the roof greening area; [circled3] Among the two cultivated plants (Phedimus aizoon (PA) and Sedum sarmentosum (SS)), SS was greatly affected, with the community almost disappearing, while PA was almost unaffected.