淹水灌溉协同钝化剂对水稻Cd吸收和积累的影响

在严格管控区Cd污染稻田开展田间试验，探讨淹水灌溉协同石灰和土壤调理剂对土壤Cd的有效性，以及水稻Cd吸收和累积的影响。结果表明：淹水灌溉协同钝化修复技术可有效降低土壤Cd的有效性和水稻Cd的吸收和积累。淹水灌溉协同石灰和调理剂处理下，土壤pH值较对照显著（P<0.05）提高0.97个单位，且土壤有效态Cd含量以及水稻根、茎和叶片Cd含量较对照分别显著（P<0.05）降低36.4%、63.0%、80.3%和42.4%，糙米Cd含量降至0.15 mg·kg^-1。淹水灌溉协同石灰和调理剂处理还显著抑制Cd向糙米部位的累积。糙米Cd的富集系数和Cd累积量较对照分别显著（P<0.05）降低67.8%和62.8%。因此，淹水灌溉协同土壤钝化修复技术是一种有效实现Cd污染稻田水稻安全生产的措施。

Effects of flooding irrigation combined with passivators on Cd uptake and accumulation in rice

A field experiment was conducted in a strictly controlled area of a soil cadmium(Cd)-contaminated paddy field to investigate the effects of flooding irrigation combined with lime and soil passivators on the availability of Cd in soil, Cd uptake, and accumulation in rice. The results showed that flooding irrigation combined with passivators could effectively reduce Cd availability in the soil and Cd uptake and accumulation in rice. The soil pH under the treatment of flooding irrigation combined with lime and soil passivators was increased by 0.97 units relative to the control, while the soil available Cd content, as well as the Cd content in roots, stems and leaves of rice were decreased by 36.4%, 63.0%, 80.3%, and 42.4%, respectively. The treatment of flooding irrigation combined with lime and soil passivators reduced the content of Cd in brown rice to 0.15 mg·kg^-1. Furthermore, the Cd accumulation in brown rice was significantly inhibited by the flooding irrigation combined with the lime and soil passivator treatment. Compared to the control, the Cd bioconcentration factor and total Cd accumulation in brown rice decreased by 67.8% and 62.8%, respectively. Therefore, flooding irrigation combined with passivators was an effective measure to achieve rice safety production in the Cd-contaminated rice fields.