Ramie planting method for restoring soil contaminated by heavy metal cadmium

Abstract

The invention relates to a ramie planting method for restoring soil contaminated by heavy metal cadmium, and belongs to the technical field of crop cultivation and agricultural environment conservation and repair, and particularly relates to the ramie planting method for restoring the soil contaminated by the heavy metal cadmium. In recent years, the phytoremediation technology gradually becomes ahot spot which is concerned by the public and the scientific academia. However, the biomass of the heavy metal super-enriched plant is generally small, the economic value is not large, and the contradiction between ecological restoration and production continuity is difficult to harmonize. The invention provides the novel ramie planting method for restoring the soil contaminated by the heavy metal cadmium. According to the method, the ramie variety can be popularized in a large area, so that the effect of restoring the soil contaminated by the heavy metal cadmium in a short time is achieved while the yield of the ramie is kept to reach a relatively high level.

Description

technical field [0001] The invention belongs to the technical fields of crop cultivation and agricultural environment conservation and restoration, and in particular relates to a ramie planting method for repairing soil polluted by heavy metal cadmium. Background technique [0002] Heavy metal control is a global issue of modern agriculture. The problem of cadmium (Cd) pollution in farmland is particularly prominent. It is reported that 95,000-450,000 tons of Cd are emitted into soil every year worldwide. Excessive Cd pollution not only reduces the yield and quality of crops, but also affects human and animal health through the food chain, leading to cancer or deformity. Traditional remediation methods for soil heavy metal pollution usually use physical and chemical techniques, such as physical separation and chemical passivation. The principle is mainly to reduce the concentration of pollutants on the soil surface or enhance the stability of heavy metals in the soil, the...

AI Technical Summary

Problems solved by technology

It is mentioned in the literature that the accumulation of cadmium in the aboveground part of some wild ramie resources reaches 131.54 mg / kg, which basically meets the index requirements of heavy metal hyperaccumulation plants, but its yield and fiber quality are difficult to meet the production requirements.

[0005] The key reasons are as follows: first, cadmium exists in different forms in the soil, including exchange state, complex state and acid-soluble state, which are affected by the application of organic fertilizer, lime and other measures in agronomic operations, as well as the influence of precipitation and irrigation. The effectiveness is not high; the second is that when heavy metals are absorbed in large quantities, the root system will be rapidly affected, resulting in a decline in root activity, slow plant growth, and the biomass cannot reach the level of significant removal of heavy metals, and even lead to sudden death of newly planted hemp seedlings and other consequences; The third is that ramie is generally planted in a large area with a single variety, and the distribution on the soil profile is not uniform and the amount is low, so the absorption of heavy metals is not sufficient.

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