Abstract
Purpose
Particularly in organic viticulture, copper compounds are intentionally released into the environment as fungicide, whereas uranium originates from conventional phosphate fertilization. Both activities contribute to the metal contamination in wine-growing areas. This pilot study aimed to better understand how soil properties influence the presence and environmental fate of copper and uranium with respect to viticultural management.
Materials and methods
We characterized metal binding forms, i.e., their association with different soil constituents, in organically and conventionally cultivated vineyard soils and adjacent upstream and downstream sediments. The available metal fraction and the fractions associated with manganese oxides, organic matter, iron oxides, and total contents were extracted sequentially.
Results and discussion
Total soil copper ranged from 200 to 1600 mg kg−1 with higher contents in topsoil than subsoil. The majority of copper (42–82%) was bound to soil organic matter. In all fractions, copper contents were up to 2-fold higher in organic than in conventional vineyards, whereas the sediment concentrations were independent of the adjacent viticultural management. A net increase of copper in downstream sediments was found only when water-extractable organic carbon (WEOC) in an adjacent vineyard was elevated. With 11 ± 1 mg kg−1, total uranium was 25% higher in conventional than in organic vineyard soils. Its affinity to iron or WEOC potentially rendered uranium mobile leading to a substantial discharge to downstream sediments.
Conclusions
Translocation of copper and uranium from vineyards into adjacent stream sediments may rather be attributed to WEOC and iron contents than the viticultural management. Follow-up studies should scrutinize the processes driving metal availability and transport as well as their interaction at the aquatic–terrestrial interface.
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Acknowledgements
This study was partly funded by the federal research initiative of Rhineland-Palatinate, Germany. We thank all wine growers involved for their active cooperation as well as Beate Fader who shared her profound local knowledge of potential sampling sites. We are grateful to Diego Fernández for providing reference samples. Verena Schlücker and Katharina Loersch are acknowledged for their help in the laboratory.
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Steinmetz, Z., Kenngott, K.G.J., Azeroual, M. et al. Fractionation of copper and uranium in organic and conventional vineyard soils and adjacent stream sediments studied by sequential extraction. J Soils Sediments 17, 1092–1100 (2017). https://doi.org/10.1007/s11368-016-1623-y
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DOI: https://doi.org/10.1007/s11368-016-1623-y