In this work, a field test was conducted to investigate the effects of heavy metal stabilizer addition on brown rice and microbial variables in a cadmium (Cd)-contaminated farmland from April to October in 2016. Compared with the control, red mud-based stabilizer (RMDL) effectively reduced the concentration of Cd in brown rice (with the removal rate of 48.14% in early rice, 20.24 and 47.62% in late rice). The results showed that adding 0.3 kg m-2 RDML in early rice soil or soil for both early and late rice increased the microbial biomass carbon (MBC), the number of culturable heterotrophic bacteria and fungi, and the catalase activity in soil at different stages of paddy rice growth. Furthermore, there was no notable difference in the diversity of the bacterial species, community composition, and relative abundance at phylum (or class) or operational taxonomic unit (OTU) levels between the control and treatment (RMDL addition) groups. In a word, RMDL could be highly recommended as an effective remediation stabilizer for Cd-contaminated farmland, since its continuous application in paddy soil cultivating two seasons rice soil could effectively decrease the Cd content in brown rice and had no negative impact on soil microorganisms.

中文翻译：

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土壤微生物群落对镉污染农田赤泥稳定剂修复的响应。

在这项工作中，进行了一项田间试验，以调查2016年4月至10月添加重金属稳定剂对受镉（Cd）污染的农田中糙米和微生物变量的影响。与对照相比，赤泥型稳定剂（RMDL）有效降低糙米中Cd的浓度（早稻中的去除率为48.14％，晚稻中的去除率为20.24和47.62％）。结果表明，在早稻或早稻和晚稻的土壤中添加0.3 kg m-2 RDML会增加不同阶段土壤中的微生物生物量碳（MBC），可培养的异养细菌和真菌数量以及过氧化氢酶活性水稻的生长。此外，细菌种类的多样性，群落组成，对照组和治疗组（添加RMDL）之间在门（或类）或操作分类单位（OTU）级别的相对丰度。简而言之，RMDL可以强烈推荐作为Cd污染农田的有效修复稳定剂，因为它在耕作两个季节的水稻土的稻田土壤中连续施用可以有效降低糙米中的Cd含量，并且对土壤微生物没有负面影响。