【摘要】 在第四纪红壤性水稻土(QP)、淀浆白土(WP)、第四纪红土(QR)和赤红壤(LR)上种水稻后,用自制根盒制得各自的根际土和非根际土,以铜为指示离子,研究了土壤对铜吸附的根际效应。结果表明,根系生长使土壤中铜专性吸附载体、pH等因子改变,从而使根际土吸附铜量大于非根际土。QR的铜吸附特征可用Freundlich方程表征,其余土壤可用Langmuir方程描述。铜吸附的根际效应大小依次为QP>WP>LR>QR。起始铜浓度对根际土壤中铜吸附的影响较复杂。除QR外,随样品铜吸附量增加,平衡液pH下降、铜吸附会引起根际土与非根际土pH的差异。更多还原

【Abstract】 The adsorption of Cu on rhizosphere and nonrhizosphere soils deri-ved from quaternary red earth (QP), white bleaching paddy soil (WP), quaternary red soil(QP) and lateritic red soil(LR) were investigated. It was showed that pH, Eh and other soil conditions were changed by the rice root growth, which resulting in the increase of Cu adsorption in rhizosphere soils. The strength of rhizosphere effect on Cu adsorption on soils decreased in following order: QP>WP>LR>QR. The initial concentration of Cu affected the rhizosphere effect significantly.更多还原