Preliminary Screening of Cadmium Hyperaccumulators
摘要
With the rapid development of industry and agriculture, soil heavy metal pollution has become increasingly serious, posing a great threat to the environment on which people depend for their survival, and has now become a hot issue of global concern. Phytoremediation has the advantages of economy, environmental protection, easy management and operation, etc. It is recognized as an environmentally friendly in-situ green remediation technology and is widely used in the field of remediation and treatment of heavy metal contaminated soils. The application value of most hyperaccumulators is limited due to their short stature, low biomass, slow growth, long growth cycle and specificity in heavy metal accumulation. Based on this, this paper conducts a screening experiment of potted plants to obtain native hyperaccumulator plants with strong tolerance to cadmium pollution and good cultivation. The plant screening experiment shows that Humulus, Clover, and Fanzha have strong tolerance to cadmium-polluted soil and can grow in soils with high concentrations of cadmium pollution. Humulus has a maximum cadmium content of 56.93 mg/kg and its maximum cadmium accumulation coefficient reaches 1.19, indicating its great potential in the remediation of cadmium-contaminated soils. Clover also shows good accumulation capacity for cadmium, with a maximum cadmium content of 92.52 mg/kg and a maximum accumulation coefficient of 3.87, approaching the critical value for hyperaccumulators. Fanzha has a stronger accumulation capacity, with a maximum cadmium content of 103.03 mg/kg and a maximum accumulation coefficient of 4.08. However, the total biomass of Fanzha is relatively small, making it less suitable for large-scale cultivation and propagation.