不同品种紫云英对镉污染土壤水稻生长累积效应的研究

Chinese Milk Vetch Varieties: Accumulation Effect on the Rice Growth in Cadmium Contaminated Soil

旨在研究不同品种紫云英绿肥对镉污染地区水稻生长及土壤质量的影响。结果表明,与2个对照组相比,翻压紫云英显著提高了土壤溶液pH,降低Eh(P<0.01),也使土壤有效态镉的含量显著降低,减少了水稻在生长过程中对镉的累积,以’湘紫3号’紫云英品种效果最为明显,与单施化肥处理相比,土壤有效镉含量降低了21.9%,植株稻草镉含量降低了39.1%,稻谷镉含量降低了43.5%,在4个品种中降幅均为最大值。不同品种紫云英翻压均能促进水稻的生殖生长,能有效提高水稻的产量,各处理间水稻的农艺性状指标和产量指标均无显著性差异。因此,选择降镉效果最佳的’湘紫3号’紫云英品种,能够更好地降低农作物对镉的吸收,提高产品的安全性。

The paper aims to study the effects of different Chinese milk vetch varieties on rice growth and soil quality in cadmium contaminated soil. The results showed that: compared with the two control groups, returning Chinese milk vetch significantly increased the pH value of soil solution, and decreased the Eh value(P<0.01),lowered the content of soil available Cd significantly, cut down the accumulation of Cd in rice growth process;the effect of’Xiang purple 3’treatment was most obvious, compared with single chemical fertilizer treatment,the soil effective cadmium content under’Xiang purple 3’treatment was decreased by 21.9%, the Cd content in straw and rice was reduced by 39.1% and 43.5%, respectively, the falling of Cd content in rice was the maximum among the 4 varieties. Different varieties of Chinese milk vetch could promote the reproductive growth of rice and effectively increase the yield of rice, but there was no significant difference in agronomic traits and yield index among the treatments. In conclusion,’Xiang purple 3’with the best effect on decreasing Cd can better reduce the absorption of Cd in crops and improve the safety of the products.