Method for remedying lead-polluted soil by utilizing Salix dascladus

Abstract

The invention relates to a method for remedying lead-polluted soil by utilizing Sweden Salix dascladus. The method comprises the steps of: selecting a Salix dascladus branch of one year old Salix dascladus tree space with a diameter of 1.5-2.0cm and a length of 15-20cm and carrying out cuttage according to a planting space of 0.5-0.75m and a row space of 0.5-1m in the lead-polluted soil; covering by utilizing polyethylene mulching film and watering; and after three years of the cuttage and growth, cutting the aboveground part of the Sweden Salix dascladus and preserving a stump height of 5-10cm when cutting to ensure that the preserved stump can keep on producing branches. By means of the method provided by the invention, the lead pollution problem of the soil can be continuously solved and the annual purification rate of the lead-polluted soil can be up to 1.01-5.61%. Compared with herbaceous plants, the Salix dascladus can enhance the lead purification capacity of the soil by 3-5 times; and the growth of the Salix dascladus is exuberant and the biomass can be up to 7-10t/hm<2>/year. According to the method, the advantages of low energy consumption and low cost in lead pollution abatement are provided, the ecological environment is not destroyed and the soil fertility can be rapidly recovered, therefore, the method provided by the invention can be widely popularized and applied.

Description

【Technical field】 [0001] The invention belongs to the technical field of agricultural environmental protection. More specifically, the present invention relates to a method for remediating lead-contaminated soil using Energy Liu No. 2. 【Background technique】 [0002] Lead is one of the important environmental pollutants, and it is listed as "five poisons" together with cadmium, mercury, chromium and arsenic. It is ubiquitous in nature and has a wide range of uses. The lead in the urban environment mainly comes from the tail gas emitted by motor vehicles, the discharge of industrial "three wastes", and the seepage of domestic garbage. At present, the world averages about 5 million tons of lead per year. In the past 50 years, the lead discharged into the global environment was about 7.83×10 5 Ton. In 2004, my country's annual output of lead reached 1.35 million tons, and its annual consumption of lead was more than 800,000 tons. It is the world's largest producer and cons...

AI Technical Summary

Problems solved by technology

Not only the productivity of herbaceous plants is low, the area of ​​roots, stems, branches, and leaves is small, the effect on the environment is limited, and the amount of lead absorbed and accumulated is small; and with the end of the growing season, a large amount of lead will be returned with the litter of herbaceous plants Soil, did not form a real sense of soil purification

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