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Method for promoting plant combined repair of cadmium polluted soil by using phosphate fertilizer

A cadmium-contaminated soil and combined restoration technology, which is applied in the field of joint restoration of cadmium-contaminated soil by using phosphorus fertilizers to promote plants, can solve the problems of slow growth of hyperaccumulators, low activity of heavy metals, and difficulty in absorbing heavy metals, etc., to reduce restoration costs and environmental risks , Strong enrichment ability, beautify the environment

Inactive Publication Date: 2010-08-25
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] Due to the low activity of the target heavy metals in many soils to be remediated, most of the hyperaccumulator plants that have been discovered grow slowly and have small biomass, while the enrichment plants that grow rapidly and have large biomass are generally difficult to absorb and enrich high concentrations of heavy metals. Brings many difficulties to the actual restoration

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  • Method for promoting plant combined repair of cadmium polluted soil by using phosphate fertilizer

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Embodiment 1

[0020] The experimental site is in the net room of the Shenyang Institute of Applied Ecology, Chinese Academy of Sciences. The site is in the center of Shenyang. There are no pollution sources around the experimental site, which is an uncontaminated area for heavy metals. The potting test soil was the clean soil collected from the Shenyang Ecological Station of the Chinese Academy of Sciences, artificially added cadmium, and CdCl 2 ? .5H 2 Add in O form. The soil type is meadow brown soil, its basic physical and chemical properties are: pH value 5.92, organic matter content 2.12%, total Cd content 0.2mg / kg.

[0021] After air-drying the soil for testing and passing through a 4mm sieve, fill each pot with 2.5kg of soil, fully mix it with Cd and phosphate fertilizer, and put it into plastic pots (φ=20cm, H=15cm), set 3 levels of Cd (mg·g -1 ): 10, 25, 50; 4 potassium dihydrogen phosphate (KH 2 PO 4 ) P level (mg·g -1): 0, 50, 150, 300; 12 treatments in total: Cd1P0; Cd2P0;...

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Abstract

The invention relates to plant repair for cadmium-based heavy metal polluted soil, in particular to a method for repairing cadmium polluted soil by using inorganic chemical fertilizer and cadmium hyper-accumulative plant mirabilis jalapa L. The method comprises the steps of applying phosphate fertilizer (monopotassium phosphate) to the cadmium polluted soil and then planting ornamental plant mirabilis jalapa L. so as to fulfill the purpose of repairing the cadmium polluted soil by enhancing the extracting effect of the mirabilis jalapa L. on the cadmium in the soil. By applying the phosphate fertilizer, the method not only can improve the biomass of the mirabilis jalapa L. and absorption and accumulation effects on the cadmium, but also can reduce the biological effectiveness and ecological risk of the cadmium in the soil. The method has the advantages of low repair cost, high repair efficiency, strong operability, little environmental risk and the like, and can beautify the environment while governing the polluted soil.

Description

technical field [0001] The invention relates to phytoremediation of soil polluted by heavy metals, in particular to a method for promoting joint remediation of cadmium-contaminated soil by using phosphorus fertilizers. Background technique [0002] Soil is the basis of agricultural production, urban construction and national economy. Whether it is plant production or animal production, it is inseparable from soil as its basic condition, especially the basis of plant agricultural production. Soil health and quality is the basis for ensuring the health and quality of agricultural products, and the quality and safety of agricultural products and the protection of the soil environment are the keys to sustainable economic and social development. Therefore, it is a major national demand to study the maintenance of soil health quality and the relationship with the quality of agricultural products (Zhou Qixing, 2005, Healthy Soil Science, Beijing: Science Press). [0003] In my cou...

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Application Information

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IPC IPC(8): C12S3/00B09C1/10
Inventor 顾平周启星张倩茹于志国任丽萍
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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