Phytoremediation method for restoring farmland soil heavy metal cadmium pollution

A phytoremediation and heavy metal technology, applied in the restoration of polluted soil, etc., can solve the problems of polluted soil characteristics and climate, unsuitability, lack of agricultural management, etc., achieve simple and easy planting technology, reduce cadmium content, and restore soil. Effects of heavy metal cadmium pollution

Inactive Publication Date: 2015-05-13
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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Problems solved by technology

At present, there are more than 400 kinds of super-accumulating plants in the world, but there are very few super-remediating plants for cadmium. The super-remediating plants have small biomass, long repairing period, shallow root depth, and are not suitable for excessive pollution concentration or multiple pollution. Adaptability, not suitable for the disadvantages and limitations of polluted soil characteristics and climate, etc. At the same time, many hyperaccumulative plants are mostly obtained from the wild environment, lacking a complete set of agricultural management and measures
[0003] It has been recognized that there are huge differences in the absorption of heavy metals among crop varieties. Rice is the most important food crop in the world, especially in Asian countries such as Japan and China. Heavy metal accumulation varieties are used to ensure food production saf

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  • Phytoremediation method for restoring farmland soil heavy metal cadmium pollution

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Embodiment 1

[0015] Taking the farmland of Shangba Village, Xinjiang Town, Wengyuan County, Shaoguan City, Guangdong Province as a pilot, the farmland of this village has been irrigated with river water polluted by tailings water from the Dabaoshan mining area for a long time, and the heavy metal cadmium in the soil generally exceeds the standard. The content is 0.498mg / kg (the national standard is cd ≤ 0.3mg / kg). In 2009, the late rice was planted with Mei Lianzao. It was managed routinely and combined with draining and sunning from the booting stage to the milk maturity stage. After harvest, the rice straw and rice were analyzed Cadmium content, the results show that the cadmium content of rice straw is as high as 28.58mg / kg, and the cadmium content of rice is 3.05mg / kg. Compared with conventional hybrid rice, the cadmium content of rice straw is 4.85 times that of hybrid rice, and 6.05 times that of rice (see Table 1) . The biomass of rice straw is 500 kg / mu, and that of rice is 400 kg / ...

Embodiment 2

[0020] In 2013, it was built in Pengzhou, Sichuan for the demonstration of the application of Mei Lian Zao. The heavy metal cadmium content in the planting soil was 0.60mg / kg. Investigate the biomass of roots, stems and rice and measure the cadmium content respectively. The results show that the average cadmium content in roots is 0.7786mg / kg, the cadmium content in stems is 0.4466mg / kg, and the cadmium content in rice is 3.15mg / kg. Combined calculation of biomass, it can be obtained that 115.64mg / mu of cadmium can be taken away by rice root, 615.81mg / mu of cadmium by rice straw, and 1417.5mg / mu of cadmium can be taken away by rice. 2148.95mg / mu, the cadmium concentration in the soil plow layer can be reduced by 0.017mg / kg. After planting, the cadmium content in the soil is 0.58mg / kg, which is basically consistent with the cadmium taken away by Mei Lianzao.

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Abstract

The invention discloses a phytoremediation method for restoring farmland soil heavy metal cadmium pollution. The phytoremediation method comprises the following steps: selecting a rice variety Meilianzao, planting the rice variety in the heavy metal cadmium polluted soil according to a conventional planting method of rice, draining the water and sunning the farmland from the booting stage to the pustulation stage and the milk ripening stage, so as to enable the heavy metal cadmium in the soil to be adsorbed in rice straws and rice through planting. The cadmium content in the soil can be effectively lowered by planting the rice variety Meilianzao in the farmland with cadmium exceeding the standard, draining water and sunning the farmland from the booting stage to the milk ripening stage, and enabling the heavy metal cadmium in the soil to be adsorbed by and transferred to the rice. The technical support is provided for restoring the soil cadmium pollution and ensuring the aftercrop food safety. The method is simple and feasible and easy to grasp by farmers; the harvest can be purchased from the farmers, so that the secondary pollution can be avoided.

Description

Technical field: [0001] The invention belongs to the field of farmland soil heavy metal cadmium pollution control, and in particular relates to a phytoremediation method for repairing farmland soil heavy metal cadmium pollution. Background technique: [0002] For heavy metal contaminated soils, phytoremediation has been considered to have the advantages of environmental friendliness and low cost. At present, there are more than 400 kinds of super-accumulating plants in the world, but there are very few super-remediating plants for cadmium. The super-remediating plants have small biomass, long repairing period, shallow root depth, and are not suitable for excessive pollution concentration or multiple pollution. Adaptability, not suitable for the disadvantages and limitations of polluted soil characteristics and climate, etc. At the same time, many super-accumulative plants are mostly obtained from the wild environment, lacking a complete set of agricultural management and mea...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 郑煜基陈能场冷小艳
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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