不同改良剂和水分管理对水稻吸收积累砷的影响

Effect of different amendments and water management on arsenic uptake and accumulation by rice in arsenic contaminated soil

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。

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.