Soil pH Effects on Uptake of Cd and Zn by Thlaspi caerulescens |
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Authors: | Autumn S Wang J Scott Angle Rufus L Chaney Thierry A Delorme Roger D Reeves |
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Institution: | (1) Department of Natural Resources and Landscape Architecture, University of Maryland at College Park, College Park, MD 20742, USA;(2) USDA-ARS Animal Manure and By-products Laboratory, Beltsville, MD 20705, USA;(3) Kent State University, Ashtabula, OH 44004, USA;(4) Massey University, Palmerston North, New Zealand |
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Abstract: | For phytoextraction to be successful and viable in environmental remediation, strategies that can optimize plant uptake must
be identified. Thlaspi caerulescens is an important hyperaccumulator of Cd and Zn, whether adjusting soil pH is an efficient way to enhance metal uptake by T. caerulescens must by clarified. This study used two soils differing in levels of Cd and Zn, which were adjusted to six different pH levels.
Thlaspi caerulescens tissue metal concentrations and 0.1 M Sr(NO3)2 extractable soil metal concentrations were measured. The soluble metal form of both Cd and Zn was greatly increased with
decreasing pH. Lowering pH significantly influenced plant metal uptake. For the high metal soil, highest plant biomass was
at the lowest soil pH (4.74). The highest shoot metal concentration was at the second lowest pH (5.27). For low metal soil,
due to low pH induced Al and Mn toxicity, both plant growth and metal uptake was greatest at intermediate pH levels. The extraordinary
Cd phytoextraction ability of T. caerulescens was further demonstrated in this experiment. In the optimum pH treatments, Thlaspi caerulescens extracted 40% and 36% of total Cd in the low and high metal soils, respectively, with just one planting. Overall, decreasing
pH is an effective strategy to enhance phytoextraction. But different soils had various responses to acidification treatment
and a different optimum pH may exist. This pH should be identified to avoid unnecessarily extreme acidification of soils. |
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Keywords: | cadmium phytoextraction soil pH Thlaspi caerulescens zinc |
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