期刊
ENVIRONMENTAL POLLUTION
卷 157, 期 12, 页码 3363-3369出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.06.032
关键词
Brassica napus; Copper; Proton buffering capacity; Proton flux; Cell wall
资金
- French Ministry of Environment (Ministere de l'Amenagement du Territoire et de l'Environnement)
We evaluated how root-induced changes in rhizosphere pH varied and interacted with Cu availability and bioavailability in an acidic soil. Rape was grown on a Cu-contaminated acidic soil, which had been limed at 10 rates. Soil Cu bioavailability was not influenced by liming. However, liming significantly decreased CaCl2-extracted Cu for pH between 3.7 and 5.1. Little effect was found for pH above 5.1. For soil pH < 4.4, CaCl2-Cu contents were smaller in rhizosphere than uncropped soil. Rhizosphere alkalisation occurred at pH < 4.8, while acidification occurred at greater pH. This explained the changes of CaCl2-Cu in the rhizosphere at low pH and the absence of pH dependency of Cu bioavailability to rape. In addition, apoplastic Cu in roots increased with increasing soil pH, most probably as a result of increased dissociation and affinity of cell wall compounds for Cu. (C) 2009 Elsevier Ltd. All rights reserved.
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