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Method for fixing lead pollution in soil using seashore paspalum turfgrass

A technology of seashore paspalum grass and seashore paspalum, which is applied in the field of environmental governance, can solve problems that do not involve lawn plants, achieve the effects of preventing leaching or dust diffusion, and reducing the risk of exposure to lead pollution

Inactive Publication Date: 2009-06-24
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

But plant fixation has so far not involved lawn plants

Method used

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  • Method for fixing lead pollution in soil using seashore paspalum turfgrass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] On the soil with extremely high level of lead pollution (lead concentration up to 4000mg / kg), seashore paspalum was planted by turf direct laying method.

[0022] 1. The turf is taken from the two-year-old mature coastal paspalum lawn. The turf contains about 1 cm thick original soil and is directly laid on the leveled lead-contaminated soil.

[0023] 2. After the turf is paved, use a compactor to compact it, so that the turf is in close contact with the underlying soil, water it once, and the soil water content reaches more than 90% of the maximum water holding capacity in the field. After 2 days, the seashore paspalum lawn can resume normal growth, and after 6 days, the lawn can reach normal quality.

[0024] 3. When the height of the lawn reaches more than 5cm, carry out normal trimming and maintenance management on the lawn. Seashore paspalum lawn grew normally, and the landscape quality was not significantly different from that of lawn with normal soil. The covera...

Embodiment 2

[0026] Seashore paspalum was planted by stem propagation method on soil with lead pollution level of 1500mg / kg.

[0027] 1. Cut the grass stems into 5-8cm long stem segments, and spread them directly on the flat soil surface. The grass stem density is about 200 grass stem segments per square meter, and the grass stems are covered with fine soil about 1cm thick;

[0028] 2. After the grass stems are planted, lightly pat them firmly with agricultural tools, and then water them once, so that the soil water content reaches more than 90% of the maximum water holding capacity in the field. After 5 days, seaside paspalum buds will grow out of the soil, and after one month, it will basically form a flat.

[0029] 3. When the height of the lawn reaches more than 5cm, carry out normal pruning, and the pruning height is set to about 5cm. Two months later, the seashore paspalum lawn plants had a coverage rate of 100%, and the growth was normal. There was no obvious difference between the...

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Abstract

The invention relates to a method for fixing lead pollution in soil by utilizing seashore paspalum lawns, which belongs to the field of environmental improvement. The seashore paspalum lawns are planted on the soil with different lead pollution degrees by the method and the lead in the soil is absorbed and fixed through the dense underground root networks of the seashore paspalum lawns so as to prevent the rain water leaching loss of lead infectants in the soil. The seashore paspalum lawns can form dense ground surface lawn coverage, thereby preventing the lead polluted soil from spreading through raise dust. The lead content in leaves on the seashore paspalum lawns is extremely less and is only 6 to 13 percent of that in the soil and the lead is fixed in leaf tissues, thereby isolating the risk of contacting the lead pollution of people. In addition, the seashore lawns also have better sight effect and soil fixing effect and have double effects of fixing plants of the polluted soil and greening and beautifying environment.

Description

technical field [0001] The invention relates to a method for fixing lead pollution in soil by using seashore paspalum turf lawn, which uses the efficient absorption capacity of seashore paspalum (Paspalum vaginatum Swartz) lawn plant roots to lead pollution in soil to fix heavy metal lead polluted soil in situ, and belongs to the field of environmental governance. Background technique [0002] Lead is one of the most prevalent heavy metal pollutants in the environment. According to incomplete statistics, more than 10% of urban children in my country have excessive blood lead levels, which seriously affects the intellectual development of children in my country and poses a huge threat to the health of our people. [0003] Lead batteries, leaded gasoline, cable jackets, building materials, paints, explosives, pesticides, fertilizers and other products all contain a large amount of lead. During the production and use of these products, a large amount of waste gas and waste wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 王兆龙朱燕华王恺刘露胡玉咏沈花
Owner SHANGHAI JIAO TONG UNIV
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