Fig. 4. Path diagrams depicting the relationships among space, individual soil properties, and P sorption as estimated with Mantel tests for (a) Rowel Branch and (b) Grindle Creek. Dashed arrows show significant simple and partial Mantel correlations, while solid arrows show significant pure-partial correlations. The thickness of the arrows is proportional to the magnitude of the correlation. Al_ox and Fe_ox, oxalate-extractable aluminum and iron, respectively; SOM, soil organic matter.