Cadmium pollution soil repair method using marigold

A cadmium-contaminated soil and soil-contaminated technology is applied in the field of repairing cadmium-contaminated soil by using cadmium-enriched flower plants marigolds. Small and beautify the environment

Inactive Publication Date: 2009-06-17
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method of using cadmium-enriched flower plant marigold (Tagetes erecta L.) to remediate and control cadmium-contaminated soil, so as to solve the problems in the prior art such as large technical difficulty, high cost, large a...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] The experimental site is located in the Shenyang Ecological Station of the Chinese Academy of Sciences, which is located in the center of the Lower Liaohe Plain, about 35km away from Shenyang City, and belongs to the warm temperate semi-humid continental climate. There are 3 plots in the experiment, the cadmium treatment concentrations (mg / kg) are: 0, 10, 50 respectively, and the cadmium in each plot has been added for more than one year; the area of ​​the experimental plot is 2m 2 (L=2m, W=1m). The soil type is meadow brown soil, and its basic physical and chemical properties are: pH value 6.60, organic matter weight content 1.55%, total N content 1.08g / kg, total Cd content 0.22mg / kg. At the beginning of May 2007, flower seedlings were raised. The soil, river sand, and vermiculite were mixed according to the weight ratio of 7:2:1 and put into the hole tray, and marigold seeds were sown on demand to keep the soil moist. After 1 month, the height of the seedlings was 6-...

Embodiment 2

[0030] In Example 1, the cadmium content was 50 mg / kg in the plot, after the first batch of marigolds were harvested in early August, 2007, the second batch of marigold seedlings were transplanted immediately. There are 8 columns planted in the plot, with 8 trees in each column, a total of 64 trees. The open-air cultivation method is adopted, and the water management is the same as in Example 1; in order to promote the growth of marigolds, 40g of urea is evenly spread in the plot. Plants were harvested in early October, 2007 after 60 days of plant growth, and the sample treatment was the same as in Example 1.

[0031] The experimental results are: due to the low temperature in the late growth period (the average daily temperature is about 10°C), the plants grow slowly and the growth is poor. The average dry weight of the aboveground part of the second crop of marigolds is 12.47g / tree, which is lower than that of the first crop; However, the cadmium content in shoots and roots...

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Abstract

The invention relates to phytoremediation technology for polluted environments, in particular to a method for restoring cadimium pollution soil by cadimium accumulator flower (Tagetes erecta L.). The method utilizes a root system of the cadimium accumulator Tagetes erecta L. to absorb and enrich the cadimium in the polluted soil in large quantity, and transfers the cadimium upward to an overground part; when a plant grows to anthesis or aging time, the plant is integrally removed and treated properly so as to absorb and remove a large amount of cadimium in the soil; and the plant is repeatedly grown, and the process is repeated, so as to continuously extract excessive cadimium in the polluted soil until the cadimium content in the soil meets environmental safety standard. The method has the advantages of small project amount, no secondary pollution, no damage to physicochemical property of the soil, along with treating the polluted soil and beautifying the environment, and so on.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating cadmium-contaminated soil by utilizing cadmium-enriched flower plant marigold. Background technique [0002] Due to the arbitrary discharge of industrial "three wastes" and unreasonable agricultural production activities, cadmium pollution in my country's soil environment is becoming increasingly serious. According to statistics, the Cd-polluted area of ​​farmland in my country was 9333ha in 1980 and 13333ha in 1989, and 5-10% of all kinds of Cd-polluted farmlands had a serious reduction in production [Document 1: Wang Kairong. The current situation of cadmium pollution in my country's farmland and its control and utilization countermeasures . Agricultural Environmental Protection, 1997, 16: 274-278.]. In 2001, the Ministry of Agriculture conducted a survey of 5.48 million ha of farmland in 320 key polluted areas in 24 provinces an...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10A01G1/00
Inventor 王林周启星刘睿于志国
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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