Table 1.

The main vegetation species and basic overview of different sample plots in the study area.

Sample plots	Altitude (m)	Vegetation Restoration Time (years)	Canopy Density	Main Tree Species	Tree Height (m)	DBH (cm)
CA①	36	10	0.5	Populus sp.; Melia azedarach; Paulownia; Salix babylonica; Platycladus orientalis; Robinia pseudoacacia; Broussonetia papyrifera; Amygdalus persica; Diospyros kaki	3–5	4–6
NSA②	32	5	0.7	Populus sp.; Salix babylonica; Robinia pseudoacacia; Ulmus pumila; Ailanthus altissima; Broussonetia papyrifera; Amygdalus persica	5–8	6–10
OSA③	30	20	0.8	Metasequoia glyptostroboides; Sabina chinensis; Koelreuteria paniculata; Ligustrum lucidum; Camptotheca acuminate; Ginkgo biloba; Broussonetia papyrifera; Trachycarpus fortunei	8–15	16–24

Note: ① CA: Control Area. ② NSA: New Subsidence Area. ③ OSA: Old Subsidence Area. DBH: Diameter at breast height.