Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing, 210008, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Sci Pollut Res Int. 2017 Aug;24(23):18926-18935. doi: 10.1007/s11356-017-9573-5. Epub 2017 Jun 27.
A pot experiment was conducted to investigate the effects of selenium (Se) and hydrated lime (Lime), applied alone or simultaneously (Se+Lime), on growth and cadmium (Cd) uptake and translocation in rice seedlings grown in an acid soil with three levels of Cd (slight, mild, and moderate contamination). In the soil with 0.41 mg kg Cd (slight Cd contamination), Se addition alone significantly decreased Cd accumulation in the root and shoot by 35.3 and 40.1%, respectively, but this tendency weakened when Cd level in the soil increased. However, Se+Lime treatment effectively reduced Cd accumulation in rice seedlings in the soil with higher Cd levels. The results also showed that Se application alone strongly increased Cd concentration in the iron plaque under slight Cd contamination, which was suggested as the main reason underlying the inhibition of Cd accumulation in rice seedlings. Se+Lime treatment also increased the ability of the iron plaques to restrict Cd uptake by rice seedlings across all Cd levels and dramatically decreased the available Cd concentration in the soil. These results suggest that Se application alone would be useful in the soil with low levels of Cd, and the effect would be enhanced when Se application is combined with hydrated lime at higher Cd levels.
采用盆栽试验研究了单独及同时施用硒（Se）和熟石灰（Lime）对酸性Cd 污染土壤中水稻生长和Cd 吸收与转运的影响。该酸性土壤 Cd 污染水平设轻度、中度和重度 3 个水平。在 0.41 mg·kg Cd（轻度污染）土壤中，单独施用 Se 可使根和地上部 Cd 积累量分别降低 35.3%和 40.1%，但当土壤 Cd 水平增加时，这种趋势减弱。然而，Se+Lime 处理可有效降低 Cd 污染水平较高土壤中水稻幼苗的 Cd 积累。结果还表明，单独施用 Se 可强烈增加轻度 Cd 污染下铁膜中 Cd 的浓度，这被认为是抑制水稻幼苗 Cd 积累的主要原因。Se+Lime 处理还增强了铁膜限制水稻幼苗吸收 Cd 的能力，且可显著降低土壤中有效态 Cd 浓度。这些结果表明，单独施用 Se 可在低 Cd 土壤中发挥作用，而在高 Cd 水平下与熟石灰联合施用则效果更佳。
