Table 9. Changes in the number of trees in the Ailanthus altissima-Robinia pseudoacacia-Paulownia tomentosa community of the World Cup Park slope district

Division	Individual(tree/100m2)
	Canopy layer							Understory layer							Shurb layer
	’99	’03	’05	’08	’12	’16	’21	’99	’03	’05	’08	’12	’16	’21	’99	’03	’05	’08	’12	’16	’21
Ailanthus altissima-Robinia pseudoacacia-Paulownia tomentosa community	10.0	9.3	8.0	7.5	5.0	2.5	3.0	8.8	12.5	10.8	7.3	2.5	10.0	3.0	44.0	38	47.0	41.5	76.0	8.5	32.0