王天齐,李艳玲,杨阳,戴雅婷,王美娥,陈卫平.不同铁氧化物对小麦幼苗镉积累的影响[J].环境科学学报,2021,41(4):1511-1517
不同铁氧化物对小麦幼苗镉积累的影响
- Effects of different iron oxides on cadmium accumulation in wheat seedlings
- 基金项目:国家自然科学基金(No.41907353);中国科学院生态环境研究中心城市与区域生态国家重点实验室项目(No.SKLURE2020-2-5)
- 王天齐
- 1. 中国科学院生态环境研究中心城市与区域国家重点实验室, 北京 100085;2. 中国科学院大学, 北京 100049
- 李艳玲
- 1. 中国科学院生态环境研究中心城市与区域国家重点实验室, 北京 100085;2. 中国科学院大学, 北京 100049
- 杨阳
- 中国科学院生态环境研究中心城市与区域国家重点实验室, 北京 100085
- 戴雅婷
- 中国科学院生态环境研究中心城市与区域国家重点实验室, 北京 100085
- 王美娥
- 中国科学院生态环境研究中心城市与区域国家重点实验室, 北京 100085
- 陈卫平
- 1. 中国科学院生态环境研究中心城市与区域国家重点实验室, 北京 100085;2. 中国科学院大学, 北京 100049
- 摘要:小麦富镉(Cd)问题受到广泛关注,铁氧化物具备降镉潜力.通过盆栽小麦幼苗实验,分析了三氧化二铁(Fe2O3)、氢氧化铁[Fe(OH)3]及拜耳法赤泥(B-RM)3种铁氧化物的降镉能力.结果显示3种铁氧化物中,Fe(OH)3可显著降低小麦幼苗茎叶Cd含量,与对照相比降幅为16.3%~27.7%,投加量为0.5%时降Cd效果最优.Fe(OH)3能够显著降低小麦幼苗根部向茎叶的Cd转运,投加量为10%时富集系数及转运系数最低.小麦幼苗根际土壤Fe/Cd、Cu/Cd及Zn/Cd是影响小麦幼苗茎叶Cd积累的关键因子,当Fe/Cd>25000、Cu/Cd > 50或Zn/Cd > 100时,根际土壤元素比与茎叶镉含量呈显著负相关.该比值的确定对于大田应用中钝化剂材料投加量的确定具有指导意义.
- Abstract:Cadmium (Cd) accumulation in wheat grain is of great concern. The iron-oxides showed the potential to decrease the Cd uptake by wheat. In this study, the greenhouse experiments were conducted to investigate the effects of iron oxides, namely ferric oxide (Fe2O3), ferric hydroxide[Fe(OH)3] and red mud from Bayer process (B-RM) on suppressing Cd accumulation in wheat seedlings. Among the three amendments, Fe(OH)3 showed effective results in reducing Cd accumulation in the shoot of wheat seedlings, with the average Cd concentration was decreased by 16.3%~27.7% as compared to the control. The minimum Cd concentration was observed at the treatment with Fe(OH)3 at 0.5% dosage. The application of Fe(OH)3 could reduce the accumulation of Cd from soil to root, and the transport of Cd from root to shoot, with the minimum plant uptake factor and translocation factor of Cd was observed at the treatment with Fe(OH)3 above 10% dosage. The ratio of Fe, Cu and Zn to Cd in rhizosphere soil was the key factor affecting the accumulation of Cd in the shoot of wheat seedlings. When Fe/Cd, Cu/Cd and Zn/Cd was more than 25000, 50 and 100, respectively, significant and negative correlations were found between Cd concentration in the shoot of wheat seedlings and the ratio of Fe/Cd, Cu/Cd and Zn/Cd. The determination of the ratio between soil trace elements could help to identify the optimal dosages of amendments in the field application for minimizing grain Cd concentration.