Effects of Superparamagnetic Nanomaterials on Soil Microorganisms and Enzymes in Cadmium-Contaminated Paddy Fields

被引：4
|
作者：
Fang D.-D. [1 ,2 ]
Zhang L.-Z. [1 ,2 ]
Wang Q. [1 ,2 ]
机构：
[1] College of Resources and Environment, Southwest University, Chongqing
[2] Key Laboratory of Agricultural Resources and Environment of Chongqing, Chongqing
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 03期
关键词：
Cadmium pollution; Enzyme activity; Magnetic nanomaterial; Paddy microorganism; Soils;
D O I：
10.13227/j.hjkx.202007303
中图分类号：
学科分类号：
摘要：
Using Fe3O4 and hydroxyapatite as raw materials, superparamagnetic nanometer-sized Fe3O4-phosphate functionalized materials (MFH) were prepared. Soil was subsequently magnetically repaired by adding MFH to cadmium-contaminated paddy field soil. Two kinds of rice with high (Yuzhenxiang) and low (Xiangwanxian-13) cadmium enrichment were selected for conduct pot experiments to study the effect of MFH magnetic separation on soil microorganisms and enzymes, and explore the possibility of application in the remediation of cadmium-polluted farmland. The results showed that MFH application improved the soil remediation effect, with significantly reduced total Cd (38.9%) and available Cd (27.3%) contents. In addition, the Cd content of the two kinds of rice grain was significantly reduced. After MFH magnetic separation, soil microbial community diversity and richness were decreased during the jointing, heading, and maturing stages of the two rice varieties. Treatment of cultivated Yuzhenxiang rice with high concentrations of Cd significantly increased the abundance of dominant Firmicute bacteria in the rice field during the jointing and heading stages. With the use of MFH in the magnetic separation, urease, catalase, and soil peroxidase activity were improved during the jointing, heading, and maturing stages of the two rice soils. The POD enzyme activity in the soil planted with Yuzhenxiang was slightly higher than that planted with Xiangwanxian-13, while urease activity showed the opposite trend. © 2021, Science Press. All right reserved.
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页码：1523 / 1534
页数：11
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