Phosphorus Sorption Kinetics in Reclaimed Lignite Mine Soils under Different Age Stands of Robinia pseudoacacia L. in Northeast Germany

Table 4

Pearson correlation among available P (P_av), total organic P (TPo), microbial P (P_MB), oxalate extractable Fe (Fe_ox), and Al (Al_ox) across reclamation sites with different age of Robinia pseudoacacia plantations.

Variable for 0–3 cm	1	2	3	4	5	6
1 Pav	—
2 TPo	0.92^**	—
3 PMB	NS	NS	—
4 Pox	0.94^**	0.92^**	NS	—
5 Feox	0.84^**	0.90^**	NS	0.95^**	—
6 Alox	0.88^**	0.96^**	NS	0.99^**	—	—
Variable for 3–10 cm
1 Pav	—
2 TPo	0.68^*	—
3 PMB	NS	NS	—
4 Pox	0.80^**	0.93^**	NS	—
5 Feox	0.80^**	0.95^**	NS	0.98^**	—
6 Alox	0.71^**	0.89^**	NS	0.96^**	—	—
Variable for 10–30 cm
1 Pav	—
2 TPo	0.59^*	—
3 PMB	NS	NS	—
4 Pox	0.70^**	0.81^**	NS	—
5 Feox	0.66^*	0.82^**	NS	0.99^**	—
6 Alox	0.60^*	0.86^**	NS	0.96^**	—	—

Values are correlation coefficients followed by significant level ( and , * and **, resp.; NS—not significant).