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Alleviated toxicity of cadmium by the rhizosphere of Kandelia obovata (S., L.) Yong.

Alleviated toxicity of cadmium by the rhizosphere of Kandelia obovata (S., L.) Yong.

Bulletin of environmental contamination and toxicology (2014-09-07)

Bosen Weng, Yong Huang, Jingchun Liu, Haoliang Lu, Chongling Yan

摘要

A pot experiment was conducted to investigate the Cadmium (Cd) toxicity alleviated by the rhizosphere of Kandelia obovata (S., L.) Yong (K. obovata), using a rhizobox with Cd concentrations of 0, 12.5, 25, 50 and 100 mg kg(-1) soil. The rhizobox used to plant K. obovata was divided into five sections by nylon cloth (S2-S5). Our results showed that pH was lower in rhizosphere than in non-rhizosphere soil. Microbial biomass C (Cmic) and N (Nmic) was stimulated in rhizosphere zone, but inhibited by Cd additions. Soil enzyme activities were significantly higher in rhizosphere (S2) than in non-rhizosphere soil (S5) (p < 0.05). In addition, DTPA-extractable Cd in different rhizosphere zone soil (S2-S5) was influenced directly under different rates of Cd supply. Moreover, Cd treatments could induce the enhancement of DTPA-extractable Cd. This study suggests that Cd toxicity can be alleviated in the rhizosphere even under high Cd supply.

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Sigma-Aldrich

镉, powder, −100 mesh, 99.5% trace metals basis

Sigma-Aldrich

镉, granular, ≥99%, 5-20 mesh

Sigma-Aldrich

镉, granular, 30-80 mesh, ≥99%

Sigma-Aldrich

镉, shot, 3 mm, 99.999% trace metals basis

镉, rod, 200mm, diameter 10.0mm, 99.999%

镉, foil, 10mm disks, thickness 1.0mm, as rolled, 100%

镉, rod, 100mm, diameter 10.0mm, 99.999%

镉, foil, 100x100mm, thickness 1.0mm, as rolled, 99.99%

镉, rod, 25mm, diameter 40mm, 99.9%

镉, rod, 50mm, diameter 40mm, 99.9%

镉, foil, 300x300mm, thickness 0.5mm, as rolled, 99.99%

镉, rod, 100mm, diameter 40mm, 99.9%

镉, tube, 500mm, outside diameter 2.29mm, inside diameter 1.27mm, wall thickness 0.51mm, 99.95+%

镉, foil, 100x300mm, thickness 0.125mm, as rolled, 99.95%

镉, foil, 50x50mm, thickness 0.125mm, as rolled, 99.95%

镉, foil, 1m coil, thickness 0.5mm, as rolled, 100%

镉, tube, 200mm, outside diameter 2.29mm, inside diameter 1.27mm, wall thickness 0.51mm, 99.95+%

镉, wire reel, 0.5m, diameter 0.70mm, as drawn, 99.99+%

镉, foil, 30x100mm, thickness 0.5mm, as rolled, 99.999%

镉, foil, 2m coil, thickness 0.5mm, as rolled, 100%

镉, foil, 6mm disks, thickness 0.125mm, as rolled, 99.99+%

镉, wire reel, 0.1m, diameter 2.0mm, hard, 99.99+%

镉, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95%

镉, foil, 100x100mm, thickness 0.125mm, as rolled, 99.99+%

镉, foil, 100x200mm, thickness 0.125mm, as rolled, 99.95%

镉, foil, 200x200mm, thickness 1.0mm, as rolled, 99.99%

镉, foil, 50x50mm, thickness 0.125mm, as rolled, 99.99+%

镉, foil, 25mm disks, thickness 0.25mm, as rolled, 99.95%

镉, wire reel, 1m, diameter 0.5mm, hard, 99.95+%

镉, rod, 100mm, diameter 5.0mm, as drawn, 99.99+%