YAO Xiaoqin1, JIANG Juan2, LONG Yunchuan1,2, ZHU Chengbin1, ZHOU Shaoqi1

（1. College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025，China; 

2. Guizhou Institute of Biology, Guiyang 550009,China）

Abstract：To explore effects on the inhibition Cd uptake of amaranth by added of garbage enzymes into Cd-contaminated soil, pot experiments were conducted to study the changes of bioavailable Cd and bacterial community structure in soil, and the Cd content in amaranth before and after the treatments by two kinds of garbage enzymes (concentrations of 1:100 and 1:1000). The results showed that after planting amaranth, both of the two concentrations of garbage enzymes could reduce the content of bioavailable Cd in soil, reduce the Cd absorption of amaranth, and change the diversity and bacteria community structure in soil. Compared with 1:100 garbage enzyme, applying 1:1000 garbage enzyme is better. Under the treatment of 1:1000 garbage enzyme, bioavailable Cd concentration in sediment decreased from 0.72 mg/kg to 0.51 mg/kg, and the enrichment coefficient and transport coefficient of amaranth to Cd decreased 59.53% and 36.36%, respectively. The Cd accumulation in amaranth and Cd content above the ground amaranth decreased by 48.03% and 58.61%, respectively. Ace index, Chao1 index, and Shannon index of soil bacteria increased by 37.54%, 34.95%, and 19.75%, respectively. The relative abundance of Proteobacteria increased, while that of Actinobacteria and Chloroflexi decreased. The application of 1:1000 garbage enzyme reduces the content of bioavailable Cd in soil, reduce the Cd absorption of amaranth, and change the diversity and community structure of bacteria in soil, which exhibited a certain application prospect.

Key words：garbage enzymes; heavy metals; passivation; amaranth; bacteria

EARTH AND ENVIRONMENT Vol.51, No.2, Tot No.352, 2023, Page 227