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Method of repairing lead-polluted alkaline soil in drought area by reinforcing arbors with chelating agent

A chelating agent and lead-polluted technology, applied in the restoration of polluted soil, etc., can solve problems such as unseen, methods of repairing lead-polluted alkaline soil in arid areas, to speed up mobility, promote extraction and restoration capabilities, and avoid Diffusion effect

Pending Publication Date: 2018-06-29
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method to use lead-enriched afforestation tree species such as eucalyptus, arborvitae, black locust, Chinese pine, etc. to remediate lead pollution in alkaline soil in arid areas.

Method used

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  • Method of repairing lead-polluted alkaline soil in drought area by reinforcing arbors with chelating agent
  • Method of repairing lead-polluted alkaline soil in drought area by reinforcing arbors with chelating agent
  • Method of repairing lead-polluted alkaline soil in drought area by reinforcing arbors with chelating agent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0048] Example 1: Green high-efficiency chelating agent screening experiment

[0049] Experiments were conducted to determine the restoration effect of chelating agent-enhanced arbor species. Air-dry the soil and sieve it, add 1.5g of lead acetate per kilogram of soil, mix well, passivate for 60 days, and distribute it in cultivation pots. The arbor seeds to be tested were selected, disinfected, rinsed, soaked, germinated, and then sown. The cultivation pot was placed in an outdoor dry shed, and the water was controlled by weighing method every day to keep the relative soil moisture content at 60%. After the seeds germinate, thin the seedlings, set the plants, and maintain routine management. After 3 to 4 months, when the seedlings are in the prime growth stage, add the chelating agent in 3 times. The types of chelating agents include S,S-ethylenediamine disuccinic acid (S,S-EDDS), nitrilotriacetic acid (NTA), For citric acid (CA), the accumulative application amount of chel...

example 2

[0055] Example 2: Arbor seed lead tolerance test (germination test)

[0056] The randomized block experiment design was adopted, the lead was mixed and added to the alkaline soil, and different treatments were set up with a lead content of 0-15g / kg, the passivation culture was carried out for 60 days, and the samples were divided into glass petri dishes. Select arbor species such as eucalyptus, arborvitae, Chinese pine, black locust, etc., disinfect, soak, and then sow them into petri dishes, cultivate them in an indoor light incubator, and manually weigh them to control the water.

[0057] The results showed that within the range of 0-5.0g / kg lead content, the seed germination rate and vigor index of eucalyptus, Chinese pine and black locust did not change significantly (P>0.05); the stem length and fresh weight of seedlings did not change significantly (P >0.05). In the range of 5.0-8.0g / kg lead content, lead has a certain inhibitory effect on various indicators of seed ger...

example 3

[0058] Example 3: Arbor seed drought tolerance test (germination test)

[0059] The stage of plant seed germination or seedling growth is the stage with the weakest stress resistance. Soil culture experiments were conducted to simulate different drought stresses by artificially controlling soil moisture. Set up different moisture gradients, select seeds, sow them in petri dishes filled with soil with different moisture contents, cultivate them in an indoor incubator, and manually weigh them to control the moisture, without applying any fertilizer during this period.

[0060] The results showed that within the range of 40% to 100% relative soil water content, arbor seeds and shrub seeds could germinate, and the relative germination rates were all above 50%. decreased, showing a decreasing trend, but the change was not obvious (P<0.05), and the inhibitory effect was small, indicating that the selected arbor species (Euan, arborvitae, Chinese pine, black locust) had strong droug...

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Abstract

The invention provides a method of repairing lead-polluted alkaline soil in a drought area by reinforcing arbors with a chelating agent. The method includes steps of: planting anti-drought, lead-resistant and lead-enriching arbors in a drought / semi-drought lead-polluted alkaline soil land, and applying the chelating agent to soil during growth season of the arbors, wherein applying quantity of thechelating agent is 0.05-0.36% by mass of air-dried soil; the chelating agent is a green chelating agent selected from amino polycarboxylic acids or low-molecular organic acids and can repair lead-polluted soil to depth of 30-120 cm. In the invention, the chelating agent is used for reinforcing arbors for repairing lead-polluted alkaline soil, where by adding the chelating agent at certain quantity, lead content of the arbors growing on the lead-polluted alkaline soil in the drought area can be increased, so that excessive diffusion of the heavy metal, lead, to environment is prevented. The method can durably repair the lead-polluted alkaline soil and the arbors can be processed into wood material, thus gaining economic value.

Description

technical field [0001] The invention belongs to the field of ecological recovery and restoration of environmental pollution, and in particular relates to a method for strengthening arbor tree species with a green chelating agent to restore lead pollution in arid alkaline soil. Background technique [0002] The rapid development of the lead-zinc mining industry, while providing a large number of resources and huge economic benefits, inevitably forms a large number of mining wastelands. Not only the heavy metal lead content is extremely high, but also through the transport and migration of wind and soil erosion. The mining area and its surrounding areas have caused serious soil lead pollution. After lead is accumulated in the soil, it is impossible to disappear from the soil environment through degradation. Instead, it remains in the soil for a long time and continuously enters the water body or is absorbed by plants through various channels. It may also be transformed into to...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 王进鑫宋清玉黄优刘潇阳
Owner NORTHWEST A & F UNIV
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