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Right arrow Wetland Soils
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A Spatially Explicit Investigation of Phosphorus Sorption and Related Soil Properties in Two Riparian Wetlands

Gregory L. Bruland* and Curtis J. Richardson

Duke University Wetland Center, Nicholas School of the Environment and Earth Sciences, Box 90333, Durham, NC 27708-0333



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  		Fig. 1. Map of the two forested riparian wetland study sites in the Coastal Plain of North Carolina.

 


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  		Fig. 2. Spatial sampling design used for this study.

 


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  		Fig. 3. Spatial distribution of (a) percent clay, (c) oxalate-extractable aluminum (Alox), and (e) the phosphorus sorption index (PSI) at Rowel Branch (RoBr), and (b) percent clay, (d) Alox, and (f) PSI at Grindle Creek (GrCr). Contour maps were made by ordinary point kriging using spherical semivariogram models for each individual soil property.

 


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  		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. Alox and Feox, oxalate-extractable aluminum and iron, respectively; SOM, soil organic matter.

 




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