Abstract：
Cadmium (Cd)-contaminated soil poses a severe threat to crop production and human health, while also resulting in a waste of land resources. In this study, two types of organic fertilizer (ZCK: Low-content available iron; Z2: High-content available iron) were applied to Cd-contaminated soil for rice cultivation, and the effects of the fertilizer on rice growth and Cd passivation were investigated in conjunction with soil microbial analysis. Results showed that Z2 could alter the composition, structure, and diversity of microbial communities, as well as enhance the complexity and stability of the microbial network. Both 2% and 5% Z2 significantly increased the fresh weight and dry weight of rice plants while suppressing Cd absorption. The 2% Z2 exhibited the best Cd passivation effect. Gene predictions suggested that Z2 may promote plant growth by regulating microbial production of organic acids that dissolve phosphorus and potassium. Furthermore, it is suggested that Z2 may facilitate the absorption and immobilization of soil cadmium through the regulation of microbial cadmium efflux and uptake systems, as well as via the secretion of extracellular polysaccharides. In summary, Z2 can promote rice growth, suppress Cd absorption by rice, and passivate soil Cd by regulating soil microbial communities.
摘要：
镉(Cd)污染土壤对作物生产和人类健康构成严重威胁,同时也造成了土地资源的浪费。在这项研究中,将两种有机肥(ZCK:低含量有效铁;Z2:高含量有效铁)施用于Cd污染土壤用于水稻种植,并结合土壤微生物分析研究了肥料对水稻生长和Cd钝化的影响。结果表明，Z2可以改变成分，结构,和微生物群落的多样性，以及增强微生物网络的复杂性和稳定性。2％和5％Z2均显着增加了水稻植株的鲜重和干重，同时抑制了Cd的吸收。2%的Z2表现出最好的Cd钝化效果。基因预测表明，Z2可能通过调节微生物溶解磷和钾的有机酸的产生来促进植物生长。此外，认为Z2可能通过调节微生物镉的外排和吸收系统来促进土壤镉的吸收和固定。以及通过细胞外多糖的分泌。总之,Z2能促进水稻生长，抑制水稻对Cd的吸收，通过调节土壤微生物群落来钝化土壤Cd。
