Method for repairing heavy metal cadmium contaminated soil in drought regions by aid of populus hopeiensis

Abstract

The invention relates to a method for repairing heavy metal cadmium contaminated soil in drought regions by the aid of populus hopeiensis. The method includes planting annual populus hopeiensis seedlings on the heavy metal cadmium contaminated soil in the drought regions according to row and plant spacing of 2*2 m at first and constructing populus hopeiensis artificial forest systems; carrying out daily management according to conventional processes and collecting and managing litter; felling the populus hopeiensis after the populus hopeiensis grows by 10 years and directionally cultivating root sucker forests in periods. The heavy metal cadmium contaminated soil in the drought regions refers to loess and is a soil parent material, the altitude ranges from 900 m to 1300 m, and the salt content of the heavy metal cadmium contaminated soil is not higher than 0.1%. The method has the advantages that economic benefits can be brought by the method, and the method has ecological and environmental functions of preventing water and soil loss and biologically fixing carbon and is quite favorable for repairing the heavy metal cadmium contaminated soil in the drought regions.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted soil, in particular to a method for repairing soil polluted by heavy metal cadmium in arid areas by using Hebei poplar. Background technique [0002] According to the latest "National Soil Pollution Survey Bulletin", the total over-standard rate of soil in my country is 16.1%, and the over-standard rate of cultivated soil points is 19.4%. The pollution is mainly from inorganic models, and cadmium (Cd) is the primary pollutant. Its point exceeding standard rate is 7.0%. However, Cd is still input into farmland soil at a rate of 0.004 mg / kg per year, and the mobility of Cd in soil is much higher than that of other heavy metals, so even at extremely low levels, it will cause serious damage to human body and Animal Health Risk. [0003] For farmland polluted by heavy metals, continuing to plant will threaten the safety of agricultural products. If the farmland is simply abandoned, the he...

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However, under the background of global warming, the changes in precipitation patterns will in

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