【摘要】 为筛选出有效治理As污染农田土壤的修复模式,采用盆栽试验的方法,比较了不同混合改良剂和水分管理对As污染土壤中水稻吸收积累As的影响。结果表明,土壤以及水稻籽粒、茎叶和根系中的As含量在不淹水条件下较低,在淹水条件下较高,在孕穗期至灌浆期淹水条件下处于前两者之间。不同水分管理方式下,添加Si+Mo使籽粒As含量降低4.8%～19.9%,茎叶As含量降低16.9%～56.3%;添加Fe+Ca使籽粒As含量降低26.6%～50.6%,茎叶As含量降低40.3%～81.2%。添加改良剂还能降低水稻根系向茎叶和籽粒转运As的能力。综合而言,不淹水+Fe+Ca处理降低水稻As含量的效果最明显。更多还原

【Abstract】 To screen the effective remediation model of As-contaminated farmland, the effect of different mixed amendments and water management on the uptake and accumulation of As in As-contaminated soil were compared using a pot experiment. The results showed the concentrations of As in soil and rice grains, shoots, and roots were lower under the non-flooded conditions, while the higher As concentrations were seen under the flooded conditions. Under different water management methods, compared with the control treatment, with the addition of Si + Mo the concentration of As in grains decreased by 4.8%～19.9% and in shoots by 16.9%～56.3%. With the addition of Fe +Ca, the concentration of As in grains decreased by 26.6%～50.6% and in shoots by 40.3%～81.2%. The addition of amendments could also reduce the ability of As transport from rice roots to shoots and grains. To sum up, the effect of non-flooded + Fe + Ca on reducing As concentration in rice was the most noticeable.更多还原