Practical method for farmland soil cadmium pollution remediationby planting Salix jiangsuensis J795

A cadmium pollution and farmland technology, applied in the restoration of polluted soil and other directions, to achieve the effect of straight trunks and deep ornamentation

Inactive Publication Date: 2016-06-15
JIANGSU GEOLOGICAL SURVEY INST
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  • Claims
  • Application Information

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Problems solved by technology

[0016] The present invention is aimed at the problem of soil Cd restoration and treatment, specifically the urgent problem that the heavy metal cadmium and other pollutants remaining in the original soil must be removed after the Cd content of farmland or farmland soil reaches a serious pollution level and is no longer suitable for continuous cultivation. The present invention provides A practical method for planting Suliu 795 to restore cadmium pollution in farmland soil. By planting a large biomass of Suliu 795 to extract residual heavy metals in the soil, reduce the cadmium concentration in the original farmland soil and gradually restore the basic ecological functions of the farmland, which belongs to heavy metal pollution in soil One of the phytoremediation technologies, new willows in polluted farmland also have the functions of biological carbon sequestration, wind protection, and green space protection, and have the advantages of broad application prospects, simple operation, and quick results.

Method used

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  • Practical method for farmland soil cadmium pollution remediationby planting Salix jiangsuensis J795
  • Practical method for farmland soil cadmium pollution remediationby planting Salix jiangsuensis J795
  • Practical method for farmland soil cadmium pollution remediationby planting Salix jiangsuensis J795

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Potted Suliu 795 experiment on Cd-contaminated farmland soil:

[0043] From the clues of soil heavy metal pollution found in the previous ecological geochemical survey and evaluation of Jiangsu Province, 5 representative farmlands seriously polluted by heavy metals such as Cd were selected. =5.6—6.5. Retrieve 1000kg of soil from the farmland (200kg from each piece of polluted farmland), and divide it into 10 ceramic pots, the height of the pot is 60 cm, the diameter of the pot mouth is greater than 60 cm, the soil in each pot is greater than 60 kg, and the thickness of the soil in the pot is greater than or equal to 50cm. Finely crush the soil in the pot, remove impurities (grass, sand, stones, etc.), smooth it, lightly compact it, and wet water, and then insert willow branches before Qingming Festival, and insert 3 willows in each pot at equal intervals. Each pot is guaranteed to survive at least one tree, and the branches of Suliu 795 variety planted are purchased a...

Embodiment 2

[0047] Selecting typical Cd severely polluted farmland and planting 795 branches of Suliu 795

[0048] A typical area was selected from the previously discovered cadmium-contaminated farmland in Jiangsu Province to carry out a field restoration experiment planted with branches of Suliu 795. The test site is located 100 meters west of a battery factory in Ehu Town, Xishan District, Wuxi City. It covers an area of ​​2.4 mu. It consists of an independent wheat field, which is about 80 meters long from east to west and 20 meters wide from north to south. 3.2 mg / kg, soil pH = 5.6, heavy metal pollutants such as Cd are mainly concentrated in the soil at a depth of 20 cm above the surface, but the depth of Hg pollution extends below 50 cm. The evaluation of the soil sediment column also found that the soil in the test site has some acidification and surface Soil Zn is slightly enriched (see image 3 shown). The north side of the test site is an orchard (vineyard), the west side is ...

Embodiment 3

[0053] Comparison of Cd remediation effects of different woody plants absorbing farmland soil

[0054] Next to the site where the above-mentioned embodiment 2 carried out the field test, a small piece of blank land was used to carry out a comparative test of planting Suliu 795, weeping willow and other ornamental seedlings. Uniformity continues to be verified, but there are significant differences in the ability of different plants to absorb soil Cd. Taking the leaves of a plant growing for one year as an example, the leaves of Suliu 795 have the strongest ability to absorb soil Cd, followed by Suliu 172, weeping willow and red maple , Magnolia and other plant leaves basically do not absorb excess Cd in the soil. See the table below (Table 1) for the comparison of test results of leaves of different plants including Suliu 795 absorbing soil Cd.

[0055] Table 1 Analysis results of Cd content (mg / kg) in leaves and soil samples of Suliu 795 and other related ornamental seedling...

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Abstract

The invention discloses a practical method for repairing cadmium pollution in farmland soil by planting Suliu 795, and belongs to the field of soil restoration. A practical method for repairing cadmium-contaminated farmland soil by planting Suliu 795, the steps are: (1) after selecting the cadmium-contaminated farmland, plowing, breaking up the soil, dividing ridges, and designing drainage ditches; (2) planting Suliu 795 795 young branches; (3) ensure the survival of more than 90% of willow trees through agronomic management and protection, and reduce the Cd content of the original polluted farmland soil by 30% within 2 years. This method can make the Cd content in the polluted soil be reduced by more than 20% on average in the first year by planting the young branches of Suliu 795 in the farmland soil with serious Cd pollution; The farmland with soil Cd content greater than 3.0mg/kg was restored until the Cd content of farmland soil was all less than 1.0mg/kg.

Description

technical field [0001] The present invention relates to agricultural land soil cadmium (Cd) pollution remediation and treatment technology, in particular to a practical method for repairing farmland soil cadmium pollution by planting Suliu 795, which is a large-biomass phytoremediation technology for in-situ removal of excess Cd in farmland soil Compared with the traditional super-accumulative phytoremediation technology, this technology has a wider prospect of promotion and application. It can combine the cultivation of willow seedlings with the restoration of Cd pollution in farmland soil, and can combine green construction such as ornamental forests and shelterbelts with soil heavy metal removal. It is an effective method to fundamentally solve the Cd pollution of farmland soil and make full use of land resources and seedling resources. Background technique [0002] On April 17, 2014, the National Ministry of Environmental Protection and the Ministry of Land and Resources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 廖启林金洋朱伯万任静华华明常青
Owner JIANGSU GEOLOGICAL SURVEY INST
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