Method for remediating cadmium contaminated farmland soil by means of sedum spetabiles

A technology of cadmium pollution and Panax notoginseng, which is applied in the field of environmental pollution control, can solve the problems of limited repair efficiency and popularization and application value, poor adaptability, and small biomass, and achieve good ornamental value and economic benefits, strong adaptability, and flowering period long effect

Inactive Publication Date: 2016-12-21
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Problems solved by technology

[0004] In phytoremediation technology, it is relatively common to use hyperaccumulator plants to absorb heavy metals in polluted soil. However, the hyperaccumulator plants found so far usually have problems such as poor adaptability to soil climate, slow growth, and small biomass, which are limited. It has become a bottleneck in phytoremediation technology that needs to be broken through.

Method used

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  • Method for remediating cadmium contaminated farmland soil by means of sedum spetabiles
  • Method for remediating cadmium contaminated farmland soil by means of sedum spetabiles
  • Method for remediating cadmium contaminated farmland soil by means of sedum spetabiles

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Embodiment 1

[0040]This embodiment adopts the pot plant simulation test method, selects three kinds of 0-20cm plow layer soils of Henan moderate cadmium-polluted farmland (HN), Guangxi light cadmium-polluted farmland (GX) and Yunnan heavy cadmium-polluted farmland (YN), and its natural Air-dried, smashed, removed foreign matter, passed through a 5mm sieve, and firstly determined the content of heavy metal cadmium in the soil. Then weigh 1 kg of soil and put it into a plastic pot with a diameter and a height of 19 cm×16 cm, and add water to irrigate thoroughly. The 10cm high seedling mother plant is divided into 3 buds according to the natural texture and transplanted into plastic pots. According to the water shortage situation, it is watered irregularly to ensure that the soil is moist but not waterlogged. There were 3 replicates for each soil.

[0041] After two months of planting in Henan moderately cadmium-polluted farmland (HN), Guangxi lightly cadmium-polluted farmland (GX) and Yunna...

Embodiment 2

[0050] Same as embodiment 1, the present embodiment also adopts the potted plant simulation test method, and all operations are the same as embodiment 1, the only difference is that after planting Sedum notoginseng, in the growth process of the plant, it is also polluted with cadmium. A citric acid (CA) solution was applied to farmland soil at an application rate of 1 mmol / kg soil.

[0051] When the plant grows to a height of 30-50 cm, the above-ground part is harvested by cutting (keeping the above-ground plant 4-5 cm during cutting), rinsed with deionized water, dried and crushed to 100 mesh. Plant samples were digested by nitric acid-perchloric acid digestion method, and the cadmium content in plants was determined by graphite furnace AAS method. The results show that if combined with the application of citric acid solution, it can also greatly improve the ability of Sedum notoginseng to enrich cadmium. For details, please refer to Figure 5 (The figure only shows moderate...

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Abstract

The invention discloses a method for remediating cadmium contaminated farmland soil by means of sedum spetabiles. The method for remediating the cadmium contaminated farmland soil by means of the sedum spetabiles comprises the steps that (1) the sedum spetabiles is planted in the cadmium contaminated farmland soil; and (2) the overground plant parts of the sedum spetabiles are cut and removed, and then remediation of the cadmium contaminated farmland soil is completed. According to the method for remediating the cadmium contaminated farmland soil by means of the sedum spetabiles, the sedum spetabiles is planted in the cadmium contaminated farmland soil and rapidly survives and grows in the soil, the root system of the sedum spetabiles absorbs cadmium in the soil and transfers the cadmium to the overground plant parts of the sedum spetabiles by means of the capacity to gather the heavy metal cadmium in the soil of the sedum spetabiles, and thus the purposes of reducing the content of the heavy metal cadmium in the soil and remediating the cadmium contaminated farmland soil are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to a phytoremediation technology polluted by heavy metals in soil, in particular to a method for repairing cadmium-contaminated farmland soil by using Sedum notoginseng. Background technique [0002] Soil is the natural environment on which human beings depend and an important resource for agricultural production. The health of the soil environment is related to the quality of agricultural products and human health. In recent years, soil heavy metal pollution has become a serious environmental problem facing the world. At present, my country's farmland soil is seriously polluted by heavy metals. According to the results of the first national soil pollution survey, the rate of soil points exceeding the standard in my country's cultivated land is 19.4%, of which the proportions of slightly, lightly, moderately and heavily polluted points are 13.7%, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/105B09C2101/00
Inventor 杨俊兴雷梅陈同斌杨军万小铭郭俊娒顾松圃郭广慧
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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