Application of jerusalem artichokes in repairing cadmium (Cd) polluted environment

Abstract

The invention relates to application of jerusalem artichokes in repairing a cadmium (Cd) polluted environment. The repairing method comprises the following steps of: planting the jerusalem artichokes on Cd polluted soil, wherein during seeding, a potassium sulfate compound fertilizer is applied; and when the jerusalem artichokes grow until the end of a flowering phase, integrally moving the roots, stems and leaves of the jerusalem artichoke from the polluted environment to remove Cd in the soil. The jerusalem artichokes can be circularly planted in the polluted soil, wherein under the Cd polluted environment, the concentration of Cd content in overground parts and the root parts of the jerusalem artichokes far exceeds 100mg kg<-1>, which is an established critical content standard required to be reached by hyperaccumulators; under the condition of treatment of 200mg of L<-1>Cd, the Cd content of the overground parts reaches higher than 700mg kg<-1>, and the Cd content of the root parts even reaches higher than 25,000 mg kg<-1>; and when the jerusalem artichokes are planted on soil of which the Cd content is 78mg / kg, the Cd concentration in the roots is 12,285.00mg / kg, the Cd concentration in the stems is 344.53mg / kg, the Cd accumulation quantity in the roots is 1044mg, the Cd accumulation quantity in the stems is 60mg, and the Cd accumulation quantity per mu is 2,568.8g.

Description

1. Technical Field [0001] The invention belongs to the technical field of biological treatment of pollutants characterized by plants, and particularly relates to the phytoremediation of environmental heavy metal chromium pollution treatment, and specifically relates to the application of the hyperaccumulation / superaccumulation plant Jerusalem artichoke in the restoration of cadmium polluted environment. 2. Background technology [0002] In recent years, with the rapid development of industrial and agricultural production, heavy metal pollution in farmland soil has become increasingly serious. The area of ​​cultivated land polluted by heavy metals in my country is nearly 20 million ha 2 , Accounting for about 1 / 5 of the cultivated land area, of which cadmium polluted cultivated land accounts for 11.33 million ha 2 . It is difficult to implement such a large area of ​​contaminated soil using traditional physical and chemical methods due to economic or technical reasons, and it is b...

AI Technical Summary

Problems solved by technology

[0003] Although there are many studies on the use of hyperaccumulator plants or plants with superaccumulative ability as Cd-polluted environment remediation test materials, some hyperaccumulator plants have been studied, but most of them are crops, herbaceous plants and aquatic plants. Due to the biomass of these plants Therefore, the ability to absorb and accumulate heavy metals is also limited, and most of the plants used to remediate the soil are burned to cause certain pollution to the environment, so the examples of using plants to remediate Cd-contaminated soil are rarely reported