摘要
为探究硅-钙土壤调理剂(Ca-Si)对镉砷复合污染水稻积累镉砷(Cd、As)的影响研究,以"泰优390"为试验品种,采用随机区组试验设计,选取 3 处(浏阳LY、临武LW和慈利CL)镉砷复合污染耕地开展田间试验.结果表明:硅-钙土壤调理剂施用下的水稻产量略有增幅(4.18%～11.26%);能有效阻控水稻对Cd、As积累,显著降低稻米中Cd、As的含量,通过镉砷同步钝化综合效果评价,LY、LW和CL的Cd、As降幅分别为 40.63%、21.62%和 41.67%,及 29.51%、25.20%和15.38%;通过镉砷同步钝化综合效果评价,LY、LW和CL的Cd-As同步降低效果分别为33.40%、23.95%和24.58%,效果显著.因此,硅-钙土壤调理剂在镉砷复合污染耕地上能同步降低稻米的镉砷含量.
Abstract
With"Taiyou 390"as the test variety,the effects of silicon-calcium(Ca-Si)soil conditioner on the accumulation of cadmium(Cd)and arsenic(As)in rice were studied.A randomized block design was adopted for field experiments,which were conducted in the farmlands contaminated by both Cd and As in Liuyang(LY),Linwu(LW),and Cili(CL).The results showed that the application of Ca-Si soil conditioner increased the rice yield by 4.18%-11.26%.Compared with the conventional treatment,the soil conditioner reduced the content of Cd in rice by 40.63%,21.62%,and 41.67%and the content of As by 29.51%,25.20%,and 15.38%in LY,LW,and CL,respectively.According to the comprehensive evaluation of Cd-As synchronous passivation effect,the Cd-As synchr-onous reduction effect in LY,LW and CL was 33.40%,23.95%and 24.58%.Therefore,the Ca-Si soil conditioner can synchronously reduce the Cd and As content in rice in the farmland exposed to compound contamination,thus controlling the accumulation of Cd and As in rice.
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