Method for screening ramie varieties and method for restoring cadmium contaminated soil by using ramie

Abstract

The invention discloses a method for screening ramie varieties and a method for restoring cadmium contaminated soil by using ramie. In the method for screening the ramie varieties, four characteristics such as overground part dry weight, plant height, relative quantity value of chlorophyll in leaves and underground part dry weight of the ramie are taken as main indexes used for evaluating cadmium resistance of the ramie varieties under the culture condition of nutrient solution, and an average value of a tolerance membership function and overground Cd content of the ramie are indexes to cluster the ramie varieties into four different types, namely a high-resistant low-absorption type, a high-resistant high-absorption type, a low-resistant low-absorption type and a low-resistant high-absorption type; and the method for restoring the cadmium contaminated soil by using the ramie is used for planting the high-resistant low-absorption type varieties to restore light cadmium contaminated soil and planting the high-resistant high-absorption type varieties to restore medium and high cadmium contaminated soil. According to the method, a plurality of indexes are utilized to comprehensively evaluate the capability of cadmium resistance and cadmium absorption of the ramie, various ramie varieties are classified accordingly to guide ramie farmers to plant different varieties in accordance with different cadmium contaminated soils, so that the cadmium contaminated soil can be effectively restored and the yield of the ramie is ensured.

Description

technical field [0001] The invention relates to a method for screening ramie varieties and a method for repairing cadmium-polluted soil by ramie. Background technique [0002] With the acceleration of urbanization and the rapid development of industry, farmland soil has been polluted by various heavy metals. In 1983, American scientist Chaney first proposed the idea of ​​using certain plants that can accumulate heavy metals to remove heavy metal pollution from soil. The proposal of this idea has aroused great interest of researchers, and found that some plants have special ability to accumulate and degrade heavy metal elements, such as ramie may be a super-accumulative plant of Cd and Pb, etc., by planting these plants to reduce or even remove Heavy metal pollution in the soil to achieve the purpose of pollution control and soil restoration. However, due to the different degrees of soil pollution by heavy metals, the current classification of plant varieties cannot guide p...

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Problems solved by technology

However, due to the different degrees of soil pollution by heavy metals, the current classification of plant varieties cannot guide people to choose suitable varieties for planting according to the different degrees of soil pollution. What kind of ramie can adapt to soils polluted by heavy metals in different degrees, so the phenomenon of blind planting is relatively common at present

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