Fixation of metals in soil constituents and potential remobilization by hyperaccumulating and non-hyperaccumulating plants: Results from an isotopic dilution study
Hammer, D. | Keller, C. | McLaughlin, M. | Hamon, R.
Available online 7 February 2006.
Показать больше [+] Меньше [-]In this study isotopic dilution methods were used to investigate the hypothesis that access to metals associated with specific chemical components in the soil that are not available to non-accumulator species could be involved in hyperaccumulation. The hyperaccumulator Thlaspi caerulescens and a non-accumulator species, Brassica napus, were grown in Cd and Zn enriched soil components calcite, goethite, charcoal and cryptomelane. The metal enriched components were aged to allow transformation of a proportion of added metals to non-labile forms. Results from the isotopic dilution L value method showed that despite taking up more metals, T. caerulescens accessed the same pool of metals as B. napus. Hence differential access to different solid-phase pools of metals appears to be an unlikely mechanism underlying metal hyperaccumulation. For all components except charcoal, L values for Cd and Zn were greater than the corresponding E values suggesting that E values may tend to underestimate the bioavailable fraction of metals in soils. Thlaspi caerulescens takes up more Cd and Zn than Brassica napus but from the same pools.
Показать больше [+] Меньше [-]Daniel Hammer, Catherine Keller, Michael J. McLaughlin and Rebecca E. Hamon
Показать больше [+] Меньше [-]http://www.elsevier.com/wps/find/journaldescription.cws_home/405856/description#description
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