Table 5. The correlation analysis among P fractions, metals and grain size of sediments.

	ex-P	BD-P	NaOH-P	HCl-P	BAP	TP	S/C	VFS	FS	CS	Al	Ca	Fe	Mn	Dis-MW
ex-P	1
BD-P		1
NaOH-P	0.550*		1
HCl-P				1
BAP	0.613*		0.942**		1
TP				0.522*		1
S/C	0.791**				0.497*		1
VFS								1
FS						−0.537*			1
CS					−0.504*					1
Al	0.470*										1
Ca			−0.524*		−0.494*							1
Fe						0.501*	0.544*	−0.629**	−0.723**	−0.488*	0.584*		1
Mn	0.536*					0.529*							0.527*	1
dis-MW			−0.631**		−0.634**					0.581*	−0.486*				1

p<0.01;

p<0.05.

BAP: bio-available phosphorus FS: fine sand (147–246 µm) CS: coarse sand (246–840 µm).

S/C: slit/clay fraction (<74 µm) VFS : very fine sand (74–147 µm) Dis-Manwan: distance to Manwan Dam.