Method for repairing soil polluted by arsenic by plant

A technology of phytoremediation and arsenic pollution, which is applied in the field of remediation of contaminated soil, can solve the problems such as the growth of centipede grass and the unclear impact of arsenic accumulation, and achieve the effects of no secondary pollution, low maintenance cost, and low management technical requirements

Inactive Publication Date: 2007-06-20
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Problems solved by technology

However, the effects of field-applied mowing strategies on

Method used

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  • Method for repairing soil polluted by arsenic by plant
  • Method for repairing soil polluted by arsenic by plant

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Experimental program
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Embodiment 1

[0023] In arsenic-contaminated farmland, according to the method shown in Figure 1, the spores of Centipede grass are sown in a specific area, and more than 100 Centipede grass can be grown per square meter (area occupied by the surface ditch); if the spores are directly sprinkled on the land surface, then The ratio of germination and fertilization is very low, and it is difficult to grow into centipede grass plants.

Embodiment 2

[0025] Get the centipede grass seedling (10~15cm height) among the embodiment 1 and transplant, its planting density is set as 10 * 10cm, 10 * 40cm, 20 * 20cm; 20 * 40cm, manage according to the management method of common crops, Centipede grass is harvested once during the whole growth period. It can be seen from Figure 2 that when the planting density is 20×20 cm, the total arsenic accumulation of Centipede grass is the highest (1.74 kg / ha), so the planting density of 20×20 cm is beneficial to improve the removal efficiency of Centipede grass for arsenic. With a planting density of 10×40 cm, the accumulation of arsenic is also high. Considering the convenience of field operations, the planting density of 10×40 cm is also a recommended solution.

Embodiment 3

[0027] Centipede grass planting and management method are the same as embodiment 2. Four treatments were set up in this experiment: cutting once (10 months after transplanting); cutting twice (harvest time was 5 months and 10 months after transplanting); cutting three times (harvest time was 4 months, 8 months and 10 months after transplanting); cutting 4 times (harvest time is respectively 4 months, 6 months, 8 months and 10 months after transplanting). After each sampling, the stubble height on the upper part of the centipede meadow was 5cm. It can be seen from Figure 3 that the order of the total arsenic accumulation in Centipede grass is: mowing 3 times > mowing 4 times > mowing 2 times > mowing 1 time, and the total arsenic accumulation of mowing 3 times is 1.9 times the total accumulation of arsenic at one time. This shows that multiple harvests are better than harvesting only once during the whole growth period, and multiple harvests can effectively avoid the relative...

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Abstract

A method for repairing the As polluted soil by plant feature use of Chinese brake herb which can absorb the As from the As-polluted soil. It includes such steps as culturing Chinese brake herb, transplanting it in said As-polluted soil by the density of 20*20 cm, and harvesting 2-3 times when the height of said Chinese brake herb is 50-100 cm.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted soil, and relates to a complete set of technology for quickly removing arsenic pollution in land by planting arsenic super-accumulating plant—Pteris vittata L. Background technique [0002] Arsenic pollution is a very common and very serious environmental problem. There are serious arsenic pollution and arsenic poisoning problems in Inner Mongolia, Shanxi and most metal mining areas in my country, which have caused great harm to people's lives and industrial and agricultural production. Arsenic has been widely used in industrial and agricultural production since the 19th century. In the past, arsenic-containing substances were often used as insecticides, fungicides, herbicides, defoliants, andricides, preservatives, paints, softeners, raw materials for chemical and semiconductor production, etc., making many orchards, farmland, and wood processing plants The land near industrial ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 廖晓勇陈同斌阎秀兰
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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