两种有代表性的紫色土的水稻盆栽试验结果表明 ,磷的加入可减轻受砷污染的红紫泥中砷对水稻的毒害 ;但磷的加入会加剧受砷污染的红棕紫泥中砷对水稻的毒害。根际无机砷的形态分布研究表明 :试验土壤上 ,根际砷各形态都比非根际高 ,砷在根际呈富集状态 ;在根际环境的作用下 ,红紫泥中 ,磷的加入加剧了砷由有效态砷 (Al As、Fe As)向相对无效态砷 (O As)转化 ,砷对水稻的毒性减弱 ;红棕紫泥中 ,磷的加入加剧了砷由相对无效态砷Fe As和Al As向有效态砷Ca As和A As(表示水溶态砷及松结合态砷 )的转化 ,砷对水稻的毒性增强 The results of pot experiments on two representative purple soils showed that the addition of phosphorus reduced arsenic poisoning of arsenic-contaminated red purple arsenic to rice; however, the addition of phosphorus would exacerbate arsenic-contaminated arsenic Poisonous to rice. The morphological distribution of inorganic arsenic in the rhizosphere showed that all forms of arsenic in the rhizosphere soil were higher than those in the non-rhizosphere soil and arsenic was enriched in the rhizosphere. Under rhizosphere environment, The toxicity of arsenic to rice was weakened by the addition of arsenic to the relatively inactive arsenic (OAs) from the active state of As (FeAs), and the addition of phosphorus increased the content of arsenic from relatively ineffective arsenic Fe As and Al As to effective arsenic Ca As and A As (representing arsenic and pine-bound arsenic), the toxicity of arsenic to rice is enhanced