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Method for restoring cadmium contaminated soil by using cypress seedlings

A cadmium-contaminated soil and cadmium-contaminated technology, applied in the field of phytoremediation of environmental pollution, can solve problems such as long repair time, secondary pollution, and low repair efficiency, and achieve high repair efficiency, well-developed root system, and efficient absorption.

Inactive Publication Date: 2012-01-25
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of repairing while developing, less investment, quick effect, safe and reliable, suitable for middle and high Phytoremediation of Slightly Cadmium Contaminated Soil

Method used

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  • Method for restoring cadmium contaminated soil by using cypress seedlings
  • Method for restoring cadmium contaminated soil by using cypress seedlings
  • Method for restoring cadmium contaminated soil by using cypress seedlings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: (contrast test of different cadmium treatment concentration of blue ice cypress seedling potted plant)

[0019] (1) Test materials and scheme layout

[0020] 1. Test material

[0021] Soil: Coarse silty sandy soil collected from the tidal flats of Shangyu City, Zhejiang Province. Its basic physical and chemical properties are as follows: pH5.7, organic matter content 5.3g kg -1 , available phosphorus 3.4mg kg -1 , Alkaline nitrogen 45mg kg -1 , available potassium 67mg kg -1 , Cadmium was not detected (determined by atomic absorption instrument, American PE company).

[0022] Blue ice cypress: purchased from Xiaoshan Nursery District, Zhejiang Province.

[0023] 2. Pot experiment

[0024] Set up 4 cadmium concentration treatments for the potting soil for testing, 0mg kg respectively -1 , 50mg kg -1 , 100mg kg -1 , 200mg kg -1 , with CdCl 2 form to join. Among them, no cadmium (0mg kg -1 ) treatment was repeated 4 times, and the remaining 3 tre...

Embodiment 2

[0044] Embodiment 2: (contrast test of different cadmium treatment concentration of Cypress seedling potted plant)

[0045] (1) Test materials and scheme layout

[0046] Cypress seedlings were purchased from Xiaoshan Nursery District, Zhejiang Province;

[0047] All the other test materials, pot test, analytical method and data processing are the same as in Example 1;

[0048] (2) Test results

[0049] Table 3 dry weight of Cypress root, stem, leaf and whole plant (g / plant) for each treatment

[0050]

[0051] Different letters in the table represent significant difference (p<0.05)

[0052] It can be seen from Table 3 that the biomass of Cypress leaves and roots accounted for a large proportion in the whole plant, which were 45% and 37%, respectively, while the proportion of stems was relatively small. at 50 and 100 mg kg -1 Under the cadmium treatment, the dry weight of roots, stems and leaves of Cypress had no significant change compared with the control treatment (w...

Embodiment 3

[0059] Embodiment 3: (contrast test of different cadmium treatment concentrations of potted plants of oriental cypress seedlings)

[0060] (1) Test materials and scheme layout

[0061] Arborvitae seedlings were purchased from Xiaoshan Nursery District, Zhejiang Province;

[0062] All the other test materials, pot test, analytical method and data processing are the same as in Example 1;

[0063] (2) Test results

[0064] Table 5 Each treatment of Arborvitae root, stem, leaf and whole plant dry weight (g / plant)

[0065]

[0066] Different letters in the table represent significant difference (p<0.05)

[0067] It can be seen from Table 5 that the biomass of orientalis leaves accounted for a relatively large proportion of 55% in the whole plant, while the proportions of stems and roots were relatively small. at 50 and 100 mg kg -1 Under the cadmium treatment, the dry weight of the root, stem and leaf of orientalis had no significant change (p-1 Under the treatment of cadmi...

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Abstract

The invention discloses a method for restoring cadmium contaminated soil by using cypress seedlings, belonging to the technical field of phytoremediation of environmental pollution. The method comprises the following steps of: selecting soil with cadmium pollution which is less than or equal to 100mg kg<-1>; planting annual or biennial cypress seedlings in the open air; watering and supplying fertilizers in due time in order to retain soil moisture content from 60 percent to 80 percent; selling or transplanting the cypress seedlings which are transplanted from the nursery in autumn of the current year or in spring of the following year; and continuously multi-cropping and managing in the original field until the cadmium pollution of the soil of the field is reduced to a safety standard which is lower than 1mg kg<-1>. The method is characterized in that the cypress seedlings have strong cadmium toxicity resistance and high restoration efficiency, the transplanted seedlings have no secondary pollution for a soil body, medium and mild cadmium contaminated soil can be restored and used in time, and the like. The method can be widely applied to medium and mild cadmium contaminated soilareas.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of environmental pollution, in particular to a method for remediating soil polluted by cadmium by using cupressaceae green seedlings. Background technique [0002] Cadmium is a heavy metal element that widely exists in nature. In recent years, due to unnatural sources such as human activities, such as mineral mining, sewage irrigation, long-term application of various cadmium-containing fertilizer materials, phosphate fertilizers, and industrial waste gas deposition, the problem of environmental pollution caused by cadmium has become increasingly serious. According to "Soil Environmental Quality Standards" (GB 15618-1995), the critical value of soil cadmium pollution is 1mg kg -1 . Cadmium pollution in my country's agricultural soil is relatively common. In 1990, the soil contaminated by cadmium had reached more than 200,000 mu. For example, the average cadmium content in cadmium-conta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 郭彬丁能飞林义成刘琛傅庆林李华李凝玉李橙
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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