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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

ABSTRACT

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.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

Cadmium, granular, 30-80 mesh, ≥99%

Sigma-Aldrich

Cadmium, granular, ≥99%, 5-20 mesh

Sigma-Aldrich

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

Sigma-Aldrich

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

Cadmium, foil, not light tested, 50x50mm, thickness 0.005mm, 99.7+%

Cadmium, foil, not light tested, 25x25mm, thickness 0.01mm, 99.7+%

Cadmium, wire reel, 0.1m, diameter 1.0mm, hard, 99.999%

Cadmium, foil, 15mm disks, thickness 0.125mm, as rolled, 99.95%

Cadmium, wire reel, 0.5m, diameter 0.5mm, hard, 99.95+%

Cadmium, foil, 25mm disks, thickness 0.125mm, as rolled, 99.95%

Cadmium, foil, 10mm disks, thickness 0.25mm, as rolled, 99.99+%

Cadmium, foil, light tested, 50x50mm, thickness 0.025mm, 99.7+%

Cadmium, foil, light tested, 25x25mm, thickness 0.05mm, as rolled, 99.99+%

Cadmium, foil, not light tested, 100x100mm, thickness 0.005mm, 99.7+%

Cadmium, foil, 8mm disks, thickness 0.125mm, as rolled, 99.99+%

Cadmium, foil, 6mm disks, thickness 0.005mm, 99.7+%

Cadmium, rod, 50mm, diameter 10.0mm, 99.999%

Cadmium, foil, not light tested, 25x25mm, thickness 0.002mm, 99.7+%

Cadmium, foil, 6mm disks, thickness 0.5mm, as rolled, 99.95%

Cadmium, foil, 6mm disks, thickness 0.25mm, as rolled, 99.95%

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

Cadmium, foil, light tested, 50x50mm, thickness 0.015mm, 99.7+%

Cadmium, foil, 8mm disks, thickness 0.01mm, 99.7+%

Cadmium, foil, not light tested, 100x100mm, thickness 0.015mm, 99.7+%

Cadmium, foil, 8mm disks, thickness 0.25mm, as rolled, 99.9%

Cadmium, foil, 6mm disks, thickness 0.015mm, 99.7+%

Cadmium, rod, 50mm, diameter 40mm, 99.9%

Cadmium, foil, 4mm disks, thickness 1.0mm, as rolled, 100%

Cadmium, foil, light tested, 25x25mm, thickness 0.015mm, 99.7+%

Cadmium, foil, 6mm disks, thickness 0.25mm, as rolled, 99.99+%