Application of eucalyptus grandis in remediation for soil polluted by heavy metal of cadmium

A technology for soil and heavy metal remediation, applied in the restoration of polluted soil and other directions, can solve problems such as insufficient phytoremediation, and achieve the effects of rapid natural reproduction and growth, improved environmental benefits, and easy survival.

Inactive Publication Date: 2012-09-19
SICHUAN AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the purpose of the present invention is to provide a new plant variety Eucalyptus grandis for the application of cadmium-contaminated soil for the above-mentioned problem of insufficient phytoremediation of heavy metal pollution in soil.

Method used

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  • Application of eucalyptus grandis in remediation for soil polluted by heavy metal of cadmium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Soil remediation test in plot

[0019] The test site is the teaching and scientific research farm community of Ya'an Campus of Sichuan Agricultural University. The soil of the plot is collected from the waste residue of Yingjing Baofeng Copper Mine Smelter in Ya'an, with a cadmium content of 28.99 mg kg -1 . The specific method is as follows: in mid-March, plant Eucalyptus grandis tissue-cultured seedlings with a plant height of 15-20 cm in holes with a size of 45 cm×45 cm×35 cm, and apply 0.3 kg of base fertilizer to each hole. The planting density is 1.5m×2.0m for plot 1, 2.0m×2.5m for plot 2, and 2.5m×3.0m for plot 3. The cover soil is just 3-5cm higher than the base of the sapling. In June, about 50cm away from the trunk, dig an annular ditch about 15cm deep, and apply 0.4kg of compound fertilizer to each plant. After 360 days, the plants were collected, and 4 plant samples were randomly selected from each plot to measure the cadmium accumulation of E...

Embodiment 2

[0023] Example 2 Pot stress test

[0024] The test site is located in the teaching and research farm of Ya'an Campus of Sichuan Agricultural University.

[0025] Using the potted method of simulating heavy metal pollution in soil, Eucalyptus grandis (Latin name Eucalyptus grandis ) seedlings were transplanted into potting soil polluted with gradient concentrations of heavy metal cadmium. The experiment started in November, and transplanted Eucalyptus grandis seedlings were tissue-cultured seedlings collected from Mingshan County, Ya'an City, Sichuan Province, with 2 plants per pot and 4 repetitions. A total of 5 treatments were set up in the experiment, namely CK (without adding Cd) and 4 experiments with different dosage concentrations, and the dosage concentration was 5 mg kg -1 (T1), 50 mg kg -1 (T2), 120 mg kg -1 (T3), 180 mg kg -1 (T4), the added heavy metal form is CdCl 2 2.5H 2 O, is an analytically pure reagent, which is added to the soil in a solid state, ...

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Abstract

The invention relates to a plant remediation technology for a soil polluted by heavy metal of cadmium, and discloses a method for remediation for soil polluted by cadmium by utilizing eucalyptus grandis of Myrtaceidites. In the technology, the eucalyptus grandis is planted in the soil polluted by heavy metal of cadmium, and the accumulated heavy metal of cadmium is absorbed by virtue of the enrichment characteristic of the plants of the eucalyptus grandis on the cadmium, and most of the cadmium is transported to the overground parts of the plants; and litters such as fallen leaves, fallen branches and fallen barks of the eucalyptus grandis are collected in late autumn every year, and the eucalyptus grandis is cut after being planted for three years, an ashing treatment is performed, and the heavy metals are extracted, so as to achieve a purpose of remediation for the soil polluted by the cadmium. The eucalyptus grandis is rapid in growth, high in biomass, and capable of holding and absorbing heavy metals, remaining stumps to branch out, performing continuous remediation for the soil polluted by cadmium, raising the virescence level of the districts polluted by heavy metals, and creating environmental benefits. The saplings of the eucalyptus grandis are convenient to obtain, low in price, simple in plantation and management, and convenient for engineering utilization.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in the environment, in particular to the application of Eucalyptus grandis in remediation of heavy metal cadmium pollution in soil. Background technique [0002] The content of Cd in the natural environment is often relatively low, but with the continuous increase of human activities, the pollution of soil and water resources by heavy metals such as Cd has become one of the serious ecological problems that affect the environment and threaten human health. Remediation of Cd-contaminated soil has become an urgent problem to be solved in today's environmental problems. [0003] Phytoremediation technology belongs to the bioremediation method. It is a technology that uses green plants with special physiological mechanisms and special tolerance to heavy metal toxic ions to repair heavy metal pollution in soil. Phytoremediation has attracted more and more attention because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 张世熔刘健宏夏春兰李婷李云徐小逊蒲玉琳贾永霞
Owner SICHUAN AGRI UNIV
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