Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 507948
Title Temporal variability in trace metal solubility in a paddy soil not reflected in uptake by rice (Oryza sativa L.)
Author(s) Pan, Yunyu; Koopmans, Gerwin F.; Bonten, Luc T.C.; Song, Jing; Luo, Yongming; Temminghoff, Erwin J.M.; Comans, Rob N.J.
Source Environmental Geochemistry and Health 38 (2016)6. - ISSN 0269-4042 - p. 1355 - 1372.
DOI http://dx.doi.org/10.1007/s10653-016-9803-7
Department(s) Chair Soil Chemistry and Chemical Soil Quality
WIMEK
Alterra - Sustainable soil management
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Bioavailability - Paddy soils - Redox potential - Trace metal contamination - Uptake - Water management
Abstract

Alternating flooding and drainage conditions have a strong influence on redox chemistry and the solubility of trace metals in paddy soils. However, current knowledge of how the effects of water management on trace metal solubility are linked to trace metal uptake by rice plants over time is still limited. Here, a field-contaminated paddy soil was subjected to two flooding and drainage cycles in a pot experiment with two rice plant cultivars, exhibiting either high or low Cd accumulation characteristics. Flooding led to a strong vertical gradient in the redox potential (Eh). The pH and Mn, Fe, and dissolved organic carbon concentrations increased with decreasing Eh and vice versa. During flooding, trace metal solubility decreased markedly, probably due to sulfide mineral precipitation. Despite its low solubility, the Cd content in rice grains exceeded the food quality standards for both cultivars. Trace metal contents in different rice plant tissues (roots, stem, and leaves) increased at a constant rate during the first flooding and drainage cycle but decreased after reaching a maximum during the second cycle. As such, the high temporal variability in trace metal solubility was not reflected in trace metal uptake by rice plants over time. This might be due to the presence of aerobic conditions and a consequent higher trace metal solubility near the root surface, even during flooding. Trace metal solubility in the rhizosphere should be considered when linking water management to trace metal uptake by rice over time.

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