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Ecological restoration method of zinc-cadmium heavy metal contaminated soil

A technology for polluted soil and ecological restoration, applied in the restoration of polluted soil and other directions, can solve the problems of increased absorption of heavy metals, and achieve the effects of strong renewable ability, fast growth and wide use.

Inactive Publication Date: 2018-02-27
INST OF FOREST ECOLOGY ENVIRONMENT & PROTECTION CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing disclosed technology includes some methods for ecological restoration of soil by intercropping some plants with Sedum sedum, but when Sedum sedum is intercropped with crops such as wheat or rice, due to the intersection of the root growth layers of the two plants , there is an obvious nutrient competition relationship, and due to the activation of heavy metals in the soil by the root system of Sedum sedum with ore, it may lead to an increase in the absorption of heavy metals in crops intercropped

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  • Ecological restoration method of zinc-cadmium heavy metal contaminated soil

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Embodiment 1

[0016] Before afforestation, weeds on the ground should be cleared, and the afforestation land should be dug to a depth of 30 cm. This test sets up three sample plots, respectively randomly distributes a single species of moso bamboo (SM), wherein the row spacing of the moso bamboo in Example 1 is 2m × 2.5m, and the planting points are arranged according to rectangles to dig and plant holes, and the size of the holes is 60cm×60cm× 60cm. Phyllostachys pubescens is transplanted and planted with 2-year-old mother bamboos that grow robustly, have luxuriant branches and leaves, are free of diseases and insect pests, and have well-developed fibrous roots. In order to improve the survival rate of moso bamboo and promote the growth of bamboo shoots and bamboo shoots, the bamboo forests are regularly irrigated, weeded, loosened and protected.

Embodiment 2

[0018] Intercropping moso bamboo and sedum sedum (IMS), the row spacing of moso bamboo in Example 2 is 2m * 2.5m, and the planting points are arranged in a rectangle to dig and plant holes, the size of which is 60cm * 60cm * 60cm. Phyllostachys pubescens is transplanted and planted with 2-year-old female bamboos that grow vigorously, have luxuriant branches and leaves, no damage by diseases and insect pests, and well-developed fibrous roots. In order to improve the survival rate of moso bamboo and promote the growth of bamboo shoots from the mother bamboo, the bamboo forest is regularly irrigated, weeded, loosened and protected; the Sedum sedum is transplanted from the nursery, and the seedlings with the same size and good growth are selected. Moso bamboo was planted in October 2012, and Sedum sedum was planted in March 2013.

Embodiment 3

[0020] Uncultivated crops are used as blank control (CK), and the three plots of the above three embodiments are closely adjacent, and each sample plot is an area of ​​10m × 20m.

[0021] Soil samples were collected from the above three test areas in August 2016. The young bamboos in the test site are grown from shoots from the mother bamboo, and the test bamboo forest is a forest of different ages. The distribution of bamboo ages is as follows: 1-year-old moso bamboos are about 70 plants / mu, 2-year-old moso bamboos are about 100 plants / mu, and 3-year-old moso bamboos are about 60 plants / mu. In each sample plot, randomly select 5 soil profiles according to the "S" shape, then take the upper 0-20cm soil, collect soil samples, and put them into sealed plastic bags. After returning to the laboratory, pick out the gravel and plant residues from the fresh soil, divide the soil sample into two parts, and store one part immediately in a sterilized ziplock bag for frozen storage, whi...

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Abstract

The invention discloses an ecological restoration method of zinc-cadmium heavy metal contaminated soil. The mode of moso bamboo and sedum plumbizincicola intercropping is adopted, the root growth layers of the two plants are crossed, thus the obvious nutrient competition relation does not exist, the root depths of the two plants are different, and thus the characteristics of fertilizers needed bythe two plants are also different. The root of the sedum plumbizincicola is generally located on the soil surface layer, when the depth of the contaminated soil reaches 30-40 cm, zinc-cadmium heavy metal in the soil cannot be absorbed by the root of the sedum plumbizincicola, but the depth of the root of the moso bamboo can reach 30-40 cm and conduct heavy metal ecological restoration on the soilbelow the surface layer of the contaminated soil.

Description

technical field [0001] The invention relates to the regeneration technology of polluted soil in the field of agricultural soil, in particular to a method for ecological restoration of zinc-cadmium heavy metal polluted soil. Background technique [0002] The discharge and diffusion of heavy metals into the soil system has brought about increasingly serious pollution problems. How to use environmentally friendly technologies to eliminate heavy metals in soil has become a worldwide problem. According to statistics, there are 150 million mu of land polluted by heavy metals in my country, and the direct loss of crops polluted by heavy metals reaches more than 20 billion yuan every year. Soil Heavy metals accumulate in organisms through the food chain, thus posing a threat to food safety and human health. Phytoremediation is to use the absorption, transformation and storage functions of plants and related soil microorganisms to reduce the concentration or toxicity of pollutants i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
Inventor 刘世荣卞方圆王晖钟哲科张小平
Owner INST OF FOREST ECOLOGY ENVIRONMENT & PROTECTION CHINESE ACAD OF FORESTRY
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