Analysis of Woody Plant Diversity in Four Universities of Nanchong City

The university campus is an important part of maintaining plant diversity of urban plant species. At present, relevant researches on campus plants mainly focus on landscape configuration, planning and design, while researches on plant community species diversity remains rare. In this paper, studies were made of the community structure characteristics and landscape structure characteristics of woody plants in universities campuses in Nanchong, including species composition, species diversity index, community similarity index, dominant species and their important values, plant ornamental characteristics and seasonal structure. The results showed that (1) there were 236 species of woody plants, belonging to 69 families and 144 genera; (2) the species were very rich in single campus, with Shannon-Wiener index ranging from 3.128 to 3.737, Simpson index ranging from 0.885 to 0.961, and Pielou index ranging from 0.702 to 0.842. However, the similarity of woody communities among different campuses was high, with Sørensen index between communities ranging from 0.466 to 0.654. In addition, it was found that the ornamental characteristics and seasonal structure of woody plants were similar in Nanchong universities, with relatively single dominant species and fewer rare and endangered species. This information has certain references for rational allocation of plant communities in campus gardens and optimization of campus environment, and provides reference for future research of scientific researchers.