Sequestration of P fractions in the soils of an incipient ferralisation chronosequence on a humid tropical volcanic island

Botanical Studies

Table 4 Significant correlations between sesquioxides and P fraction in soils of Green Island chronosequence

	P fraction	KCl P	NaHCO₃ Pi	NaHCO₃ Po	NaOH Pi	NaOH Po	HCl P	Residual P
Soil attribute
All non-coral samples
Fe_t	ns	ns	ns	ns	ns	ns	ns	ns
Fe_d	ns	ns	ns	ns	ns	ns	ns	ns
Fe_t/ Fe_d	ns	ns	ns	ns	ns	ns	ns	ns
Fe_o	ns	0.497**	ns	0.654***		0.64***	ns	ns
Fe_d–Fe_o	ns	ns	ns	ns	ns	ns	ns	ns
(Fe_d–Fe_o)/ Fe_d	ns	– 0.639***	ns	– 0.773***	– 0.409*	– 0.558**	ns	ns
Al_t	ns	ns	ns	ns	ns	ns	ns	ns
Al_d	ns	ns	ns	ns	ns	0.449*	ns	ns
Al_t/ Al_d	ns	ns	ns	ns	ns	ns	ns	ns
Al_o	ns	ns	0.39*	0.69***	0.565**	0.708***	ns	ns
Al_d–Al_o	ns	ns	ns	ns	ns	ns	ns	ns
(Al_d–Al_o)/ Al_d	ns	-0.408*	ns	– 0.673***	ns	ns	ns	ns
Clay	ns	ns	ns	ns	ns	ns	-0.449
pH	ns	ns	ns	ns	ns	ns	ns	ns
Organic C		0.423*	ns	ns	ns	ns	ns	ns
Non-coral topsoils
Fe_t	ns	ns	ns	ns	ns	ns	ns	ns
Fe_d	ns	ns	0.929***	ns	ns	ns	ns	ns
Fe_t/ Fe_d	ns	ns	ns	ns	ns	ns	ns	ns
Fe_o	ns	ns	ns	0.861*	ns	ns	ns	ns
Fe_d–Fe_o	ns	ns	0.955***	ns	ns	ns	ns	ns
(Fe_d–Fe_o)/ Fe_d	ns	ns	ns	ns	ns	ns	ns	ns
Al_t	ns	ns	ns	ns	ns	ns	ns	ns
Al_d	ns	ns	0.856*	ns	ns	ns	ns	ns
Al_t/ Al_d	ns	ns	ns	ns	ns	ns	ns	ns
Al_o	ns	ns	ns	ns	ns	ns	ns	ns
Al_d–Al_o	ns	ns	0.956***	ns	ns	ns	ns	ns
(Al_d–Al_o)/ Al_d	ns	ns	ns	ns	ns	ns	ns	ns
Clay	ns	ns	ns	ns	ns	ns	ns	ns
pH	ns	ns	ns	ns	ns	ns	ns	ns
Organic C	ns	ns	ns	ns	ns	ns	ns	ns
Non-coral subsoils
Fe_t	ns	ns	ns	ns	ns	ns	ns	ns
Fe_d	ns	ns	ns	ns	ns	ns	ns	ns
Fe_t/ Fe_d	ns	ns	ns	ns	ns	ns	ns	ns
Fe_o	ns	ns	ns	0.82*	ns	ns	ns	ns
Fe_d–Fe_o	ns	ns	ns	ns	ns	ns	ns	ns
(Fe_d–Fe_o)/ Fe_d	ns	– 0.862*		– 0.874*	ns	ns	ns	ns
Al_t	ns	ns	ns	ns	ns	ns	ns	0.821*
Al_d	ns	ns	ns	ns	ns	ns	ns	ns
Al_t/ Al_d	ns	ns	ns	ns	ns	ns	ns	ns
Al_o	ns	ns	ns	0.892*		ns	ns	ns
Al_d–Al_o	ns	ns	ns	ns	ns	ns	ns	ns
(Al_d–Al_o)/ Al_d	ns	ns	ns		0.952*	ns	ns	ns
Clay	ns	ns	– 0.936***	ns	ns	ns	ns	ns
pH	ns	ns	ns	ns	ns	ns	ns	ns
Organic C	ns	ns	ns	ns	ns	ns	ns	ns