4.2. Soil Extraction as a Predictor of Cu : Ni Uptake Ratio
Clearly more Cu than Ni was taken up by pine, which is in agreement with the higher Cu concentrations in relation to the Ni concentrations measured from the soil samples.
However, the soil Cu concentrations were almost 10 times higher than the soil Ni concentrations, while the wood Cu concentrations of pine were only 3 times higher than those of Ni.
In birch, the Cu and Ni concentrations in the wood of the control seedlings were equal and in the mulch treated seedlings the Cu concentrations were only twice as high as those of Ni.
Hence, the BaCl2 + EDTA extraction schema used by us as soil extraction method appeared to give an underestimation of both the birch and pine available amount of Ni in relation to Cu.
The BaCl2 method is reported to give an indication of immediately exchangeable metals [32,33], while the use of EDTA has been reported to give a good estimation of potentially plant available metal fractions [34].
4.2. Soil Extraction as a Predictor of Cu : Ni Uptake Ratio Clearly more Cu than Ni was taken up by pine, which is in agreement with the higher Cu concentrations in relation to the Ni concentrations measured from the soil samples. However, the soil Cu concentrations were almost 10 times higher than the soil Ni concentrations, while the wood Cu concentrations of pine were only 3 times higher than those of Ni. In birch, the Cu and Ni concentrations in the wood of the control seedlings were equal and in the mulch treated seedlings the Cu concentrations were only twice as high as those of Ni. Hence, the BaCl2 + EDTA extraction schema used by us as soil extraction method appeared to give an underestimation of both the birch and pine available amount of Ni in relation to Cu. The BaCl2 method is reported to give an indication of immediately exchangeable metals [32,33], while the use of EDTA has been reported to give a good estimation of potentially plant available metal fractions [34].
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