Table 1.

Characteristics of plants and soil

Site and date sampledPlant speciesSoil pHFe concn in:Organic carbon content of soil (%)bSoil composition
H2Oa (μM)Plaque (μmol of Fe/g [dry wt])Bulk soil (μmol of Fe/g [dry wt])% Sandc% Silt% Clay
Neutral tributary, July 1997 S. australis 6.2565.96,256.62,544.0 ± 555.311.0 ± 0.370.3 ± 4.923.9 ± 7.15.85 ± 2.2
Acidic stream
 October 1997 J. effusus 3.6751.11,230.1868.3 ± 122.06.7 ± 0.276.6 ± 3.914.4 ± 5.79.1 ± 1.8
L. oryzoides 4.4522.4771.82,418.1 ± 116.311.0 ± 0.175.9 ± 1.712.0 ± 4.012.1 ± 5.6
Unknown sedge4.5757.64,027.7941.7 ± 81.34.9 ± 0.381.7 ± 1.87.7 ± 1.910.6 ± 0.1
 November 1998 L. oryzoides 3.49288.2302.1
  • a The dissolved-Fe concentration was determined by the ferrozine assay.

  • b Determined by loss upon ignition in muffle furnace (8).

  • c Soil texture was determined by the hydrometer method (9).