TABLE 4.

Pearson correlation analysis among phosphorus content, Pb immobilization efficiency and gene abundance.

Type	WSP	AP	Pb-IEa	bpp	phoD	gcd
WSP	1	0.990**	0.987**	0.932**	0.577	0.848*
AP	0.990**	1	0.990*	0.906*	0.566	0.772
Pb-IE	0.987**	0.990**	1	0.917*	0.640	0.817*
bpp	0.932**	0.906*	0.917*	1	0.747	0.889*
phoD	0.577	0.566	0.640	0.747	1	0.677
gcd	0.848*	0.772	0.817*	0.889*	0.677	1

^aPb-IE, Pb immobilization efficiency. The asterisks represent significant level (* P < 0.05; ** P < 0.01).