Method for safely utilizing red-spotted stonecrop and wheat intercropping and repairing cadmium-polluted soil

Abstract

The invention relates to the technical field of environmental pollution treatment, and discloses a method for safely utilizing red-spotted stonecrop and wheat intercropping and repairing cadmium-polluted soil. The method is characterized in that red-spotted stonecrop and wheat are intercropped and planted on the cadmium-polluted soil, and an efficient cadmium blocking agent is sprayed from the jointing stage to the filling stage of the wheat. According to the method, the cadmium hyperaccumulators including red-spotted stonecrop and wheat are intercropped and planted on the cadmium-polluted soil, and absorption of the wheat root system to cadmium in the soil is reduced by utilizing the hyperaccumulation capacity of the red-spotted stonecrop to cadmium in the soil; and meanwhile, the high-efficiency cadmium blocking agent is sprayed from the jointing stage to the filling stage of the wheat, so that the absorption of cadmium in atmospheric dust fall by leaves and ears is reduced, the migration of cadmium in wheat tissues to wheat grains is reduced, and the purposes that cadmium in the wheat grains does not exceed the standard, the cadmium content of the soil is gradually reduced and the cadmium-polluted soil is repaired while production is performed are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to a method for safely utilizing sedum-wheat intercropping and repairing cadmium-contaminated soil. Background technique [0002] The excessive rate of heavy metals in cultivated land soil in China's main grain-producing areas is 21.49%, of which the proportion of heavy pollution is as high as 5.02%. Cadmium is the largest pollutant and poses a potential threat to agricultural ecosystems and human health. The safe use and restoration of a large amount of cadmium-contaminated soil has become a difficult problem at present. The commonly used methods are: 1. Add soil remediation agents such as organic matter and calcium oxide to the soil to reduce the activity of cadmium in the soil, thereby reducing the plant's ability to cadmium in the soil. Absorption; 2. Use super-accumulator plants to extract cadmium in the soil, gradually reduce the cadmium con...

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Problems solved by technology

[0005] However, in the prior art, the treatment of heavy metals in cadmium-contaminated soil mainly focuses on the absorption of cadmium in the soil by plant roots, while ignoring the absorption of cadmium in the air dustfall by the aboveground parts such as leaves; Neither the technology nor the products take into account the impact of the two pollution sources of atmospheric dust and soil on plants. At the same time, there is no research on the safe use of a large number of wheat intercropping models on cadmium-contaminated soils and the restoration of cadmium-contaminated soils.

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