Soil Phosphorus Forms and Profile Distributions in the Tidal River Network Region in the Yellow River Delta Estuary

Table 4

Pearson correlation coefficients between P fractions and soil geochemical properties.

Sites		Pearson correlation
		Resin-P	Bicarb-Pi	NaOH-Pi	D.HCl-Pi	C.HCl-Pi	Bicarb-Po	NaOH-Po	C.HCl-Po	Residual-P
BRB; (𝑛=18)	pH	−0.66**
	SM	−0.77**
	Salinity	0.50*
	TOC	0.59*	0.64**
	Ca	0.65**				0.78**
	Al	0.59*				0.74**
	Fe	0.73**	0.56*			0.76**
RB; (𝑛=18)	pH			−0.66**				0.61**	−0.58*	−0.58*
	SM	−0.47*	−0.49**
	Salinity		0.54**						0.55*
	TOC	0.59*	0.75**	0.61**
	Ca	0.48*	0.79**	0.76**		0.55**			0.48*
	Al	0.54*	0.83**	0.73**		0.53**			0.49*
	Fe	0.59*	0.86**	0.73**		0.51**			0.50*
TB; (𝑛=18)	pH
	SM			−0.54**
	Salinity	0.53*	0.60**	0.77**
	TOC	0.45*	0.60**	0.66**
	Ca	0.59**	0.71**			0.72**			0.50*
	Al	0.59**	0.61**			0.82**	0.45*		0.51*
	Fe	0.64**	0.80**			0.67**			0.46*
TCB; (𝑛=18)	pH			−0.50*
	SM	−0.47*	−0.49**
	Salinity		0.54**	0.48*
	TOC
	Ca	0.50*	0.79**		0.50*		0.51**	0.55*
	Al	0.51*	0.83**		0.51*		0.57**	0.51*	0.55*
	Fe
All; (𝑛=72)	pH	−0.48**	−0.45**	−0.60**		−0.50**				−0.41**
	SM							−0.28*
	Salinity	0.76**	0.69**	0.61**		0.64**		−0.36**		0.43**
	TOC	0.63**	0.65**	0.62**		0.58**				0.34**
	Ca	0.75**	0.74**	0.60**		0.72**				0.36**
	Al	0.75**	0.71**	0.54**		0.73**				0.36**
	Fe	0.65**	0.63**	0.48**		0.63**				0.33**

∗Significant at the 0.05 level (2-tailed).
**Significant at the 0.01 level (2-tailed).