Method for judging and screening low-accumulation plants

Abstract

The invention relates to a method for judging and screening low-accumulation plants containing toxic and harmful substances (including substances with health risks, such as heavy meals, organic pollutants, and the like), in particular to a standard for judging the ultralow-accumulation plants and a method for screening the low-accumulation plants. The method is mainly characterized by providing the standard for judging the ultralow-accumulation plants for the first time and developing the method for screening the low-accumulation plants on the basis of the standard. The method usually takes crops as screening objects and also comprises the screening of other plant species with potential utilization values; in the method, crop species for implementing the safety production of farm products under the condition of polluted soil environment are screened as major objects by taking a potting soil culture experiment as a guide and combining a field experiment as a verification; and the method also comprises the screening of other plant species with potential utilization value.

Description

technical field [0001] The present invention relates to the control technology of agricultural environmental safety and polluted environment, and relates to the evaluation and screening method of plants with low accumulation of toxic and harmful substances (including heavy metals and organic pollutants and other substances with health risks), especially the evaluation of ultra-low accumulation plants. Methods for screening of standard and low accumulating plants. Background technique [0002] With the development of industrial and agricultural production, the pollution of the soil environment, especially the agricultural environment, has become increasingly prominent. According to reports, as many as 20 million hectares of cultivated land are polluted by heavy metals in my country, and the total amount of farmland polluted by various organic pollutants or chemicals is more than 60 million ha. Soil environmental quality is directly related to the safety of agricultural produ...

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Problems solved by technology

Among them, 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 [Document 1: Zhou Qixing et al. Contaminated soil Restoration principles and methods [M] Beijing: Science Press, 2004.] However, phytoremediation also has the following disadvantages: the biomass of hyperaccumulated plants is small and has obvious geographical distribution, and the restoration period is too long, so it is still difficult to promote on a large scale (Document 3: 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.)

However, for the screening research of crops with low accumulation of toxic and harmful substances, the academic circles at home and abroad have not yet formed a set of scientific standards and methods, and the concept of "ultra-low accumulation plants" has not yet been formed.

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