Method for remedying calcicolous soil polluted by heavy metals of copper and lead through phytostabilization

Abstract

The invention relates to a method for remedying calcicolous soil polluted by heavy metals of copper and lead through phytostabilization. The method comprises the steps of firstly, planting arbors in the calcicolous soil polluted by heavy metals of copper and lead according to the density of 1.5m*1.5m and the depth of a planting cave not lower than 0.8m, and interplanting shrubs and herbaceous plants to construct an arbor-shrub-herbaceous plant three-dimensional remediation mode; cultivating the arbors through a conventional method; finally, performing intermediate cuttings or clear cutting on the arbors growing for five to seven years according to arbor application purposes. The method is safe, friendly to the environment, free of secondary pollution, suitable for remediation of non-point source pollution and capable of improving soil organic matters and soil fertility and creating economic benefit, and thereby being easily accepted by the public.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a phytofixation and remediation method for heavy metal copper and lead polluted calcareous soil. Background technique [0002] Sewage irrigation, sludge agricultural use, and extensive application of pesticides and fertilizers have resulted in the widespread pollution of copper (Cu), lead (Pb) and other heavy metals in farmland in arid areas. According to the survey results of the soil status of the Ministry of Environmental Protection, the area of ​​cultivated land polluted by heavy metals in my country has reached 20 million hm 2 , and its area accounts for about 14.8% of my country's existing cultivated land area of ​​2.027 billion mu announced by the Ministry of Land and Resources in 2012. As a result, my country's annual grain production reduction due to heavy metal pollution exceeds 10 million tons, resulting in a total economic loss of at least 20 ...

AI Technical Summary

Problems solved by technology

However, based on the alkaline pH and high calcium carbonate content of the soil in arid areas, the content of metal ions in the so

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