Method for improving cadmium-contaminated orchard soil remediation capability of solanum photeinocarpum

Abstract

The invention discloses a method for improving cadmium-contaminated orchard soil remediation capability of solanum photeinocarpum and belongs to the field of remediation of heavy metal pollution environment. The method includes the following steps: planting mining ecotype solanum photeinocarpum in cadmium-contaminated orchard soil by means of direct transplantation or direct seed broadcasting, and after the mining ecotype solanum photeinocarpum enters a rapid growth stage, spraying 1-20umol/L abscisic acid solution on leaf surfaces; at least 30 days after spraying, harvesting overground parts of the mining ecotype solanum photeinocarpum. The method for improving cadmium-contaminated orchard remediation of hyperaccumulator is low in cost, high in operability, environment friendly and effective.

Description

technical field [0001] The invention belongs to the field of remediation of environmental heavy metal pollution, in particular to a method for remediating cadmium-contaminated soil in orchards. Background technique [0002] In recent years, the problem of cadmium pollution has become increasingly serious due to factors such as industrial pollution, farmland irrigation, and agricultural materials. The area of ​​cadmium-contaminated soil in my country has reached 200,000 square kilometers, accounting for 1 / 6 of the total cultivated land area. As a new and environmentally friendly restoration method, phytoremediation is gradually emerging. Phytoremediation is to use specific plants to enrich the ability of specific heavy metals far beyond ordinary plants, enrich the heavy metals in the soil, and finally harvest the plants. Can remove heavy metals from soil. [0003] Solanum photeinocarpum is an annual plant in the Solanaceae family, up to 1 meter high, and is a common orchard...

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Problems solved by technology

[0004] But unfortunately, it is only a potential cadmium hyperaccumulator plant, because its transfer coefficient is far from 1 (an important index for evaluating hyperaccumulator plants, that is, the cadmium enrichment capacity of the aerial part exceeds that of the underground part, because usually Harvesting only harvests the aboveground part. If the underground part is also harvested at the same time, although the cadmium can be removed most fully, it is difficult to have practical repair significance due to the greatly increased workload)

[0005] Moreover, under the condition of high concentration of cadmium pollution, the enrichment ability of Solanum nigrum to cadmium is further reduced.

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