Method for remediating contaminated soil by field planting of willow micro-cuttings

Abstract

The invention provides a method for remediating contaminated soil by field planting of willow micro-cuttings. A to-be-remediated contaminated soil site is leveled, micro-cutting propagules 4-5 cm longare subjected to broadcast sowing and covered with an organic matrix 3-6 cm thick, relative humidity is kept at 35%-60%, and in-situ field planting of the willow micro-cuttings and remediating are performed. In the method, the micro-cuttings are planted in the field in a uniform broadcast sowing manner, manual cutting one by one is not needed, the micro-cuttings after broadcast sowing are coveredwith the organic matrix, soil humidity and fertility are guaranteed, a reproduction coefficient is increased, survival rate is increased, plant growth is promoted, and efficient enrichment of pollutants by the plants is realized. With adoption of the method, large-area mechanical in-situ operation and construction can be performed, field planting time and economic cost for the plants in a contaminated site are saved, risks of exposure of people to the contaminated site are reduced, and the method is quite applicable to the contaminated site with large area, complicated topographic condition,difficult manual operation and cheap remediation work.

Description

technical field [0001] The invention belongs to the field of soil remediation, and in particular relates to a method for remediating polluted soil by planting micro-cuttings of willow trees. Background technique [0002] In the remediation technology of contaminated soil, tree remediation is an emerging phytoremediation technology, which mainly uses the roots of trees to absorb and enrich pollutants, transport and store pollutants to the roots and aboveground parts of plants, and can The purpose of removing heavy metals in the soil environment is to achieve the purpose of removing heavy metals in the soil environment by means of cutting, cutting, and mowing woody plants. [0003] Willow has the advantages of strong adaptability, rapid growth, large biomass, pruning resistance, and strong tillering ability. It can well adapt to contaminated sites with low soil nutrients, harsh environmental conditions, and strong biological toxicity. important material. [0004] In the prio...

AI Technical Summary

Problems solved by technology

After the cuttings, weed management should be carried out. The soil should be kept moist to facilitate the survival and growth of the cuttings. At the same time, it is easy to breed weeds and affect the early growth of the cuttings.

[0007] Cuttings are currently the main means of tree colonization in the process of phytoremediation of soil pollution. However, due to the complexity and particularity of the habitat of the contaminated site, there are often difficulties such as poor soil texture, poor nutrients, and strong toxicity, resulting in low reproduction coefficient, low survival rate, and poor growth. Defective, low seedling survival rate and other problems are not enough to fully exert the ecological restoration function of the plant

Images