Table 9 Correlation analysis green quantity in buffer green

Classification			Trees ratio of green	Trees volume coefficient	Shrubs ratio of green	Shrubs volume coefficient	Ratio of green	Green volume coefficient	Green volume
Whole	Green fluctuated concentration rate	Pearson correlation coefficient	0.041	0.058	−0.018	0.050	0.041	0.061	0.034
		Sig. (2-tailed)	0.517	0.351	0.780	0.426	0.514	0.331	0.587
		N	256	256	256	256	256	256	256
	Residential area fluctuated concentration rate	Pearson correlation coefficient	0.131*	0.073	−0.029	0.047	0.142*	0.076	0.046
		Sig. (2-tailed)	0.037	0.242	0.650	0.458	0.023	0.224	0.459
		N	256	256	256	256	256	256	256
Winter	Green fluctuated concentration rate	Pearson correlation coefficient	−0.190*	0.080	0.030	0.119	−0.211*	0.085	0.047
		Sig. (2-tailed)	0.032	0.368	0.736	0.181	0.017	0.341	0.597
		N	128	128	128	128	128	128	128
	Residential area fluctuated concentration rate	Pearson correlation coefficient	−0.031	0.149	−0.049	0.146	−0.058	0.156	0.102
		Sig. (2-tailed)	0.726	0.093	0.579	0.099	0.516	0.079	0.253
		N	128	128	128	128	128	128	128
Spring	Green fluctuated concentration rate	Pearson correlation coefficient	0.322**	0.042	−0.077	−0.026	0.348**	0.042	0.024
		Sig. (2-tailed)	0.000	0.639	0.386	0.772	0.000	0.636	0.788
		N	128	128	128	128	128	128	128
	Residential area fluctuated concentration rate	Pearson correlation coefficient	0.322**	0.019	−0.016	−0.040	0.373**	0.019	0.005
		Sig. (2-tailed)	0.000	0.829	0.861	0.657	0.000	0.834	0.957
		N	128	128	128	128	128	128	128