**4. Species richness within each loop of Beijing City**

The number of plant species distributed within the 2nd ring is the least, with 218 species (**Table 1**). Among them, there are 66 species of plants in the streets in the 2nd ring, 189 species in the park, and 159 species in the residential area. There are 371 species in the 5th to 6th ring, which is significantly higher than other rings. Among them, the number of plant species in the park is the largest, reaching 299 species. There is little difference in the distribution of plant species in other rings, namely 243 species in the 2nd to 3rd ring, 259 species in the 3rd to 4th ring, and 261 species


#### **Table 1.**

*The number of species and the proportion of the total number of species in each ring under different types of green space.*

*Assessment of Urban Biodiversity: A Case Study of Beijing City, China DOI: http://dx.doi.org/10.5772/intechopen.106264*

in 4th to 5th ring. Among the 536 species distributed in the urban area of Beijing, 114 species are only distributed in one ring, accounting for 21.3% of the total number of species surveyed, belonging to rare distribution; 266 species are distributed in 2rd to 4th rings, account for 49.6% of the total surveyed species and belong to dispersive species; and 156 species of plants are distributed in the 5 loops, accounting for 29.1% of the surveyed total species, belonging to widely distributed species.
