title: Alleviated toxicity of cadmium by the rhizosphere of Kandelia obovata (S., L.) Yong.
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.
authors.affiliation: Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361005, People's Republic of China.
authors.forename: Bosen
authors.initials: B
authors.lastname: Weng
authors.forename: Yong
authors.initials: Y
authors.lastname: Huang
authors.forename: Jingchun
authors.initials: J
authors.lastname: Liu
authors.forename: Haoliang
authors.initials: H
authors.lastname: Lu
authors.forename: Chongling
authors.initials: C
authors.lastname: Yan
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D002104:Cadmium / Q000378:metabolism* / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D004798:Enzymes / Q000378:metabolism; D043982:Rhizophoraceae / Q000187:drug effects* / Q000378:metabolism* / Q000502:physiology; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism* / Q000633:toxicity*; D013312:Stress, Physiological / Q000187:drug effects
chemical_list: D004798:Enzymes; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium