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Method for promoting plant restoration efficiency of arsenic polluted soil

A phytoremediation and soil remediation technology, applied in the field of arsenic-contaminated soil phytoremediation and polluted ecological restoration, can solve the problems of inhibiting the growth of centipede grass, slow growth rate, and growth restriction of centipede grass.

Inactive Publication Date: 2005-07-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI +1
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Problems solved by technology

[0005] However, the application of centipede grass to remediate arsenic-contaminated soil also has some unavoidable limitations.
First of all, centipede grass is a fern, and its growth rate is slow in the early stage; secondly, the excessively high arsenic concentration in the soil will inhibit the growth of centipede grass; thirdly, in the case of poor soil or compound pollution, the growth of centipede grass is often caused by metal Toxic or incapable of obtaining sufficient essential mineral nutrients

Method used

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  • Method for promoting plant restoration efficiency of arsenic polluted soil
  • Method for promoting plant restoration efficiency of arsenic polluted soil

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preparation example Construction

[0042] The preparation of basic material among the present invention:

[0043] 1. Acquisition of hyperaccumulative plant Centipede grass seedlings

[0044] (1) In summer and autumn, the original materials of Centipede grass were collected from arsenic-polluted areas (such as realgar mining area in Shimen County, Hunan Province) to obtain Centipede grass spores. Preserve the spores at room temperature, under ventilated and dry conditions.

[0045] (2) Soil (non-polluting) and vermiculite are mixed in a ratio of 1:1 to obtain a culture substrate. After the substrate is sterilized (10KGy irradiation sterilization or 121°C high-pressure steam sterilization for 2 hours to kill pathogenic bacteria), mix base fertilizer (N, 200mg kg -1 , P, 50 mg kg -1 ; K, 150 mg kg -1. It can also be applied at the same time (an appropriate amount of other trace elements), put it into a pot or a seedling tray, and water according to 20% of the weight of the substrate. After the water penetrat...

Embodiment

[0055] The mycorrhizal fungus Glomus mosseae (Nicol. & Gerd) Gerdmann & Trappe uses maize as the host to multiply, and the rhizosphere soil containing the root segments of the host plant, mycorrhizal fungal spores and hyphae outside the root is used as the inoculant. Centipede grass (Pteris vittata L.) spores were pre-cultured to obtain seedlings for transplanting.

[0056] Arsenic-contaminated soil was collected from Chenzhou City, Hunan Province. Basic physical and chemical properties: pH (1:2.5 water extraction), 8.03; organic matter content, 5.25%; available phosphorus (Olsen-P), 15.3mg kg -1 ;Total arsenic content, 74.3mg kg -1 ; The soil is passed through a 2mm sieve and sterilized by irradiation (10KGy).

[0057] A square box made of plexiglass was used as a culture container. Each pot is filled with 1.5Kg of soil. In addition to the background arsenic concentration, the test also set two arsenic application concentrations: 100mg kg -1 and 300mg kg -1 . At each c...

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Abstract

The invention relates to a method for plant restoring soil of arsenic contamination, which is realized through inoculating arbuscular mycorrhizal fungi to centipedefern, a kind of pteridophyte, thus producing fungus root, the method comprises the steps of, (1) collecting raw pteridophyte material, obtaining spores of pteridophytes, cultivating young plant sprout, (2) producing fungus roots from pteridophyte, (3) transplanting the adult strain of young sprouts to arsenic contaminated soil. The invention can be applied to aid the arsenic super rich centipedefern to adapt to arsenic contamination environment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a pollution ecological restoration technology, in particular to a method for phytoremediation of arsenic-contaminated soil. Background technique [0002] Due to geological causes or industrial production activities such as arsenic mining, smelting and processing, a large area of ​​arsenic-contaminated soil is produced. Arsenic pollution not only leads to a decrease in crop yields, but also results in farmland abandonment in severe cases, and the arsenic in the soil may enter the human body through the food chain or water bodies, thereby endangering the health of livestock and residents, and even causing vicious events such as poisoning of residents. In areas with severe arsenic pollution (high arsenic areas), due to the difficulty in plant growth, the natural landscape and ecological balance have been damaged to varying degrees, and some villages have been deserted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G7/00A01H17/00C05G1/00C09K17/00C12N1/14
Inventor 陈保冬李晓林刘于朱永官
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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