title: [Phytoavailability and chemical speciation of cadmium in different Cd-contaminated soils with crop root return].
abstract: Pot experiments were conducted under greenhouse condition to investigate the effects of crop root return on succeeding crops growth, Cd uptake and soil Cd speciation in Cd-contaminated soil and artificial Cd-contaminated soil. The results showed that the amount of root residue returned to soil by corn and kidney bean growth successive for 3 times was 0.4%-1.1%. The Cd returned to soil by root residue was 1.3%-3.5% to the total soil Cd. There was no significant difference in the shoot dry weights of winter wheat and Chinese cabbage grown on the 2 Cd-contaminated soils with and without root return. While Cd concentration of Chinese cabbage increased significantly in the Cd-contaminated soil with corn or kidney bean root return. Light fraction of soil organic matter increased with root return in both of the Cd-contaminated soils. The percentage of Cd in the light fraction of soil organic matter increased with root return in the artificial Cd-contaminated soil. Soil carbonates-bound Cd concentration decreased significantly with corn root return in the Cd-contaminated soil. Soil exchangeable Cd concentration decreased and soil Fe-Mn oxide-bound Cd concentration increased significantly with kidney bean root return in the artificial Cd-contaminated soil.
authors.affiliation: College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China. jingzhang1004@yahoo.com.cn
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Ling-Ling
authors.initials: LL
authors.lastname: Yu
authors.forename: Shu-Zhen
authors.initials: SZ
authors.lastname: Xin
authors.forename: De-Chun
authors.initials: DC
authors.lastname: Su
mesh_terms: D000383:Agriculture / Q000379:methods; D001682:Biological Availability; D002104:Cadmium / Q000737:chemistry* / Q000493:pharmacokinetics; D018556:Crops, Agricultural / Q000737:chemistry* / Q000254:growth & development*; D018517:Plant Roots / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry* / Q000493:pharmacokinetics
chemical_list: D012989:Soil Pollutants; D002104:Cadmium