Back to Search Start Over

Rhizospheric mobilization and plant uptake of radiocesium from weathered micas: II. Influence of mineral alterability

Authors :
UCL - AGRO/MILA - Département des sciences du milieu et de l'aménagement du territoire
Thiry, Y.
Delvaux, Bruno
Gommers, A.
Iserentant, Anne
4th International Phosphorus Workshop on Critical Evaluation of Options for Reducing Phosphorus Loss from Agriculture
UCL - AGRO/MILA - Département des sciences du milieu et de l'aménagement du territoire
Thiry, Y.
Delvaux, Bruno
Gommers, A.
Iserentant, Anne
4th International Phosphorus Workshop on Critical Evaluation of Options for Reducing Phosphorus Loss from Agriculture
Source :
Journal of Environmental Quality, Vol. 34, no. 6, p. 2174-2180 (2005)
Publication Year :
2005

Abstract

Acute K depletion in the rhizosphere can lead to increased root uptake of radiocesium. Two processes can govern this increase: the very low uptake of potassium and the weathering of Cs-fixing clay minerals. Their respective importance is, however, unknown. We investigated the effects of these processes on radiocesium mobilization by roots of willow (Salix viminalis L.) from three micas: muscovite, biotite, and phlogopite. Willows were grown in a mixed quartz-mica substrate with the three respective Cs-134-contaminated micas as sole sources of potassium and radiocesium. After 7 wk of plant growth, the micas were partially weathered. The degree of mica weathering and the prevalent potassium concentration in the solution increased in the order muscovite (5-11 mu M K) < biotite (25-32 mu M K) < phlogopite (25-35 mu M K). The mobilization and root uptake of radiocesium were negligible with muscovite but increased in the same order. These results show that mica weathering directly and chiefly governs the mobility of radiocesium in K-depleted rhizosphere soil. The low mobility of trace Cs in the muscovite rhizosphere is linked with the dioctahedral character of this mica, and hence to its very low alterability.

Details

Database :
OAIster
Journal :
Journal of Environmental Quality, Vol. 34, no. 6, p. 2174-2180 (2005)
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1130549745
Document Type :
Electronic Resource