title: Co-effect of phosphorus and cadmium interaction on fraction distribution and accumulation of phosphorus in mangrove-sediment system.
abstract: Mangrove [Kandelia obovata (S. L.)] seedlings were cultivated in rhizoboxes under different rates of phosphorus (P) and cadmium (Cd) level. The speciation distributions of P both in the rhizosphere and non-rhizosphere sediments were examined using sequential extraction procedures. P contents in different K. obovata (S.L.) tissues were also determined. Results showed that considerable differences existed in P speciation distribution between rhizosphere and bulk sediments. A higher proportion of iron-bound phosphate (Fe-P) was found in the rhizosphere sediments, while a relatively higher concentration of exchangeable phosphate (Ex-P) and Aluminum-bound phosphate was found in the bulk sediments. P accumulation in plant tissues was significantly positively correlated to Ex-P and Fe-P. Results indicated that root activities play an important role in the P cycling. And the coexistence of P and Cd induced higher P accumulation in mangrove plants. It is suggested that the root-induced chemical and biological changes in the rhizosphere environment play an important role in enhancing the bioavailability of soil P.
authors.affiliation: a School of Life Science , Guizhou Normal University , Guiyang , China.
authors.forename: Jingna
authors.initials: J
authors.lastname: Du
authors.affiliation: b Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems , Xiamen University , Xiamen , China.
authors.forename: Junyi
authors.initials: J
authors.lastname: Yu
mesh_terms: D001673:Biodegradation, Environmental; D002104:Cadmium / Q000737:chemistry*; D019015:Geologic Sediments; D010758:Phosphorus / Q000737:chemistry*; D018517:Plant Roots; D043982:Rhizophoraceae
chemical_list: D002104:Cadmium; D010758:Phosphorus
keywords: mangrove; phosphorus; rhizosphere; speciation