ABSTRACT

Cadmium (Cd) contamination of agricultural soils is a global concern, as it can cause the accumulation of Cd in food. In this study, an incubation experiment was carried out to investigate the effect on Cd availability in paddy soil amended four kinds of silkworm excrements organic fertilizer (SEs). And the soil amended with chicken manure organic fertilizer (CM) and no organic fertilizer (CK) were as control. The SEs and CM were added to soil at the rate of 3% (w/w). The results showed that the available Cd content in soils decreased by 27.3–40.9% and 14.1–27.3% in treatments of SEs compared to the CK and CM after incubation 60 days. The potential mechanisms for reducing the availability of Cd were subjected, including: (i) high aromaticity of SEs; (ii) SEs improved pH and OM content of soil; (iii) XRD pattern proved that Cd in soil was mainly stabilized in the form of CdCO₃ and Cd(OH)NO₃ by adding SEs. In conclusion, SEs application was an effective method to decrease Cd availability in paddy soil.

摘要

农业土壤中的镉 (Cd) 污染是全球关注的问题，因为它会导致食物中镉的积累。本研究通过孵化试验研究了改良四种蚕粪有机肥（SEs）对稻田土壤Cd有效性的影响。以鸡粪有机肥(CM)和不施有机肥(CK)改良的土壤为对照。SEs 和 CM 以 3% (w/w) 的比例添加到土壤中。结果表明，与CK和CM相比，SEs处理60天后土壤中有效Cd含量分别降低了27.3-40.9%和14.1-27.3%。研究了降低 Cd 可用性的潜在机制，包括： (i) SE 的高芳香性；(ii) SEs 提高了土壤的 pH 值和有机质含量；₃和 Cd(OH)NO ₃通过添加 SEs。总之，SEs 应用是降低水稻土壤中 Cd 有效性的有效方法。