Table 13 Correlation analysis plant structure in buffer green

Classification			Width	Green width	Height	Shrubs structure type	Trees structure type
Whole	Residential area fluctuated concentration rate	Pearson correlation coefficient	−0.100	−0.120	−0.033	−0.240**	−0.153*
		Positive probability (both sides)	0.111	0.056	0.597	0.000	0.014
		N	256	256	256	256	256
	Green fluctuated concentration rate	Pearson correlation coefficient	−0.095	−0.153*	0.100	−0.107	−0.095
		Positive probability (both sides)	0.130	0.014	0.111	0.088	0.130
		N	256	256	256	256	256
Winter	Residential area fluctuated concentration rate	Pearson correlation coefficient	−0.171	−0.234**	−0.052	−0.242**	−0.613**
		Positive probability (both sides)	0.054	0.008	0.557	0.006	0.000
		N	128	128	128	128	128
	Green fluctuated concentration rate	Pearson correlation coefficient	−0.146	−0.279**	0.179*	−0.117	−0.436**
		Positive probability (both sides)	0.101	0.001	0.043	0.189	0.000
		N	128	128	128	128	128
Spring	Residential area fluctuated concentration rate	Pearson correlation coefficient	−0.057	−0.040	−0.023	−0.301**	0.254**
		Positive probability (both sides)	0.523	0.655	0.794	0.001	0.004
		N	128	128	128	128	128
	Green fluctuated concentration rate	Pearson correlation coefficient	−0.049	−0.028	0.022	−0.112	0.298**
		Positive probability (both sides)	0.580	0.755	0.810	0.207	0.001
		N	128	128	128	128	128

p<0.05.
p<0.01