Pb-pollution soil safe production method by utilizing low Pb-accumulation Chinese cabbage qiu'ao

Abstract

The invention relates to the vegetable safety production technology of polluted environment, in particular to a method which utilizes a Chinese cabbage rejection mechanism to carry out safety production on the Pb-pollution soil; the Chinese cabbage with low Pb-accumulation capacity is planted on the Pb-pollution soil, so as to realize the purpose of removing excessive Pb in the soil. The Chinese cabbage with low Pb-accumulation capacity is planted on the Pb-pollution soil, the overground part of the Chinese cabbage breed repels to adsorb the Pb in the pollution soil, the root part fixedly adsorbs the Pb in the soil, so as to prevent the Pb from being transferred to the overground edible part, the overground part is used as safety vegetable for being eaten or sold, the root part is processed properly, by repeatedly planting the Chinese cabbage crop genotype and repeatedly carrying out the process, the excessive Pb in the pollution soil can be continuously extracted, and the Pb content of the edible part of the Chinese cabbage meets the standard of the pollution-free vegetables. The method has the advantages of low cost, no damage to physicochemical property of the soil, no secondary pollution, and simultaneous production and treatment in the pollution soil.

Description

technical field [0001] The invention relates to a vegetable safety production technology that pollutes the environment, in particular to a method for safe production on lead-polluted soil by utilizing the rejection mechanism of Chinese cabbage. Background technique [0002] Lead (Pb) has become one of the most common heavy metal pollutants in the current environment. Human industrial and agricultural production activities, such as: mining, smelting, incineration, use of leaded gasoline, pigments, chemical fertilizers and pesticides, etc., are the main sources of lead pollution (Document 1: Zhou Qixing. Technical reconstruction and prospect of contaminated soil remediation [J]. Environmental Pollution Control Technology and Equipment, 2002, 3(8): 36-40.). The lead content in farmland soil in the suburbs of some industrial cities is more than 100 times higher than the background value, and the lead content in rice produced is dozens of times higher than that in non-polluted a...

AI Technical Summary

Problems solved by technology

These physical and chemical treatment technologies have their own advantages. Although they have great effects in the treatment of small-scale polluted soil and serious sudden pollution accidents, and the treatment period is short, there are generally problems such as high price, large engineering volume and easy to cause secondary pollution. It is generally difficult to apply it in the remediation and treatment of large-scale and lightly polluted soil.

[0004] Compared with these traditional treatment technologies, phytoremediation, as an emerging in-situ green restoration technology, has the advantages of low cost, no damage to the environment, and easy acceptance by people, and has gradually become a research and application hotspot in the field of environmental science. 3: Zhou Qixing, Song Yufang. Principles and Methods of Contaminated Soil Remediation [M] Beijing: Science Press, 2004. However, phytoremediation also has the following disadvantages: hyperaccumulated plant biomass is small and has obvious geographical distribution, and the remediation cycle is too long It usually takes hundreds of years, and it is still difficult to promote in practice (Document 4: Liu Weitao, Zhang Yinlong, Chen Zhemin, etc. Absorption and distribution of lead and zinc by green trees in mining areas [J]. Journal of Applied Ecology, 2008, 19(4 ):752~756)

Although my country has carried out extensive research on the pollution of heavy metals in vegetable soil and vegetables in the suburbs, most of them have focused on investigation and sampling analysis or preliminary research on the absorption and enrichment of heavy metals in different vegetables and their mechanisms. There are still few studies on the difference of absorption and enrichment, and the research on Chinese cabbage varieties with low accumulation of heavy metals has not been reported (Document 6: Zhao Xiaohu, Wang Fuhua, Zhang Chong, etc. Heavy metal pollution in southern vegetable fields and control measures for vegetable safety production[J] .Agricultural Environment and Development, 2007, 24(3): 91~94)

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