Evidence of colloids as important phosphorus carriers in natural soil and stream waters in an agricultural catchment

Colloids (1–1,000 nm) are important phosphorus (P) carriers in agricultural soils. However, most studies are based on colloids from soil waters extracted in the laboratory, thus limiting the understanding of the natural transfer of colloidal P along the soil‐to‐stream continuum. Here, we conducted a...

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Bibliographic Details
Published in:Journal of environmental quality 2020-07, Vol.49 (4), p.921-932
Main Authors: Gu, Sen, Gruau, Gérard, Dupas, Rémi, Jeanneau, Laurent
Format: Article
Language:English
Subjects:
Earth Sciences
Geochemistry
Hydrology
Sciences of the Universe
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Summary:Colloids (1–1,000 nm) are important phosphorus (P) carriers in agricultural soils. However, most studies are based on colloids from soil waters extracted in the laboratory, thus limiting the understanding of the natural transfer of colloidal P along the soil‐to‐stream continuum. Here, we conducted a field study on the colloidal P in both natural soil waters and their adjacent stream waters in an agricultural catchment (Kervidy‐Naizin, western France). Soil waters (10–15 cm, Albeluvisol) of two riparian wetlands and the adjacent stream waters were sampled monthly during wet seasons of the 2015–2016 hydrological year (seven dates in total). Ultrafiltration at three pore sizes (5 kDa, 30 kDa, and 0.45 µm) was combined with inductively coupled plasma mass spectrometry (ICP–MS) to investigate variability in colloidal P concentration and its concomitant elemental composition. Results showed that colloidal P represented, on average, 45 and 30% of the total P (
ISSN:0047-2425
1537-2537
DOI:10.1002/jeq2.20090