Table 7. Changes in the biodiversity index in the Robinia pseudoacacia community of the World Cup Park slope district

Community name	Survey year	Species number	H’(Shannon)	J’(evenness)	D(dominance)	H’max
Robinia pseudoacacia community	1999	6	0.0838	0.1077	0.8923	0.7782
	2003	7	0.1204	0.1425	0.8575	0.8451
	2005	6	0.0928	0.1193	0.8807	0.7782
	2008	5	0.1954	0.2795	0.7205	0.6990
	2012	2	0.1182	0.4416	0.5584	0.2653
	2016	4	0.3703	0.6151	0.3849	0.6021
	2021	11	0.9546	0.9166	0.0834	1.0414