CN101642770B - Application of houttuynia cordata in restoring lead-polluted soil - Google Patents
Application of houttuynia cordata in restoring lead-polluted soil Download PDFInfo
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- CN101642770B CN101642770B CN2009103069455A CN200910306945A CN101642770B CN 101642770 B CN101642770 B CN 101642770B CN 2009103069455 A CN2009103069455 A CN 2009103069455A CN 200910306945 A CN200910306945 A CN 200910306945A CN 101642770 B CN101642770 B CN 101642770B
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Abstract
The invention discloses an application of houttuynia cordata in restoring lead-polluted soil, wherein, the houttuynia cordata is planted in lead-polluted soil to absorb and extract lead in the soil in order to solve the lead pollution problem of soil permanently; the application has the characteristics of lower energy consumption, strong operability, less environmental disturbance, no damage to physicochemicai properties of soil and no secondary pollution; the accumulated heavy metals in the soil can also recycled by advanced technology while environment treatment, thus creating certain economic benefit; and the application also has the advantages of low expenditure, great suitability for large-area heavy-metal-polluted soil and the like.
Description
Technical field
The invention belongs to the phytoremediation technology field of heavy-metal contaminated soil, the particularly application of plant cordate houttuynia in the rehabilitating soil lead contamination.
Background technology
Lead and human lives relation very closely; Generally all exist plumbous in the entire environment; Lead in the environment is mainly derived from the production and the use of mining, metallurgy industry and leaded coating, paper, gasoline, explosive etc., also contains a large amount of lead in municipal sewage, the mud simultaneously.Human for thousands of years the continually developing and utilizing of natural resources added the fast development of industry, caused serious day by day global lead contamination.The soil lead contamination all can exert an influence to the physicochemical property of edaphon, soil enzyme activities and soil.Can a certain amount of lead of accumulation in the plant, the health of the mode harmful to human through food chain.The clinical manifestation of lead poisoning is anaemia, constipation, stomachache, vomiting and anorexia etc.Relevant in recent years research mainly concentrates on plumbous genotoxicity effect and to the aspect that influences of children's health, and finding plumbously has extremely strong harm to human body.Therefore remediating lead-contaminated soil has become China's soil sustainable use problem demanding prompt solution.
The heavy-metal contaminated soil reparation has become one of global research focus.Traditional heavy metal pollution of soil control measures mainly contains soil moved in to improve the original, soil removal and replacement and casting method; Washing and leaching method; The electrochemistry repairing method; Use modifying agent etc.Though these measures have effective and characteristics instant effect aspect the pollution of improvement heavy metals in farmland; But investment is expensive, equipment needed thereby is complicated, destructible soil texture and ecological environment; And cause secondary pollution easily; Be difficult to so promote, and can not fundamentally solve the heavy metal pollution of soil problem.
Phytoremediation technology (Phytoremediation) is a kind of emerging, cheap and technology of heavy-metal contaminated soil improvement efficiently.The emphasis of work is further to seek and develop enriching plant and the super enriching plant with good heritability at present.Can be behind the plumbous entering soil directly by plant absorbing; And it is very low the most plants of occurring in nature to the absorbability of lead; Common plant lead content generally is no more than the 10.00mg/kg dry weight; The plumbous super enriching plant of having found few in number is mainly from abroad, and domestic discovery has the species of higher accumulation ability and few to lead.Therefore, be devoted to find that biomass is big, growth rate is fast, the plumbous super enriching plant that heavy metal of body content is high is one of main research aspect of phytoremediation technology.But the hyperaccumulative plant of finding at present is minority after all; And the plant poor growth that has, individual short and small, biomass is little; Be not suitable for phytoremediation; So it is good when seeking the plant species of exploitation restoration of soil polluted by heavy metal, also can to take a broad view in some patience, biomass is big, though do not reach the tired plant that higher patience and accumulation ability are also arranged of ultraproduct.
Houttuynia (Houttuynia? Cordata? Thunberg), is Saururaceae (Saururaceae) Dokudami species, also known as CEN grass, ear root, smelly fishy grass, is a perennial herb, natural state height of about 30 cm, artificial cultivation of up to 60-100 cm adult, is widely distributed in our country.Have biomass height, well developed root system, growth rate fast, to characteristics such as environmental suitability are strong.
Summary of the invention
The inventor finds that cordate houttuynia has certain absorption and extracts characteristic plumbous in the soil in long-term great deal of experimental process; Therefore; Main purpose of the present invention is exactly the not enough problem of plant resources that can be used for the plant soil restoration lead contamination to above-mentioned prior art; A kind of new plant resources that can be used for the rehabilitating soil lead contamination is provided, cordate houttuynia rationally is used for the rehabilitating soil lead contamination; Have characteristics such as simple, efficient, safety, cost is low.
In order to realize the foregoing invention purpose, the technical scheme that the present invention adopts is following:
Cordate houttuynia is planted in the application of cordate houttuynia in the rehabilitating soil lead contamination in lead-contaminated soil, through the lead in a large amount of absorption extraction soil of cordate houttuynia root system, and it is transferred in the plant, removes in good time, reaches the purpose of lead contamination in the rehabilitating soil.
When the plantation cordate houttuynia, can adopt subterranean stem segment cuttage method, get cordate houttuynia subterranean stem section, cuttage gets final product in lead-contaminated soil; Also can adopt cultivate the strong sprout of subterranean stem section.
But the random time among the plantation Yu Yinian of cordate houttuynia is carried out, and its fertility is strong, and survival rate is high, and the management of plantation back is comparatively simple, does not need special management, can adopt open-air plantation; After the plantation, irregularly watering according to soil lack of water situation gets final product, and soil moisture content is not had strict demand, keeps ground moistening to get final product as far as possible.
Be to improve the effect of lead contamination in the rehabilitating soil, when cordate houttuynia grows to a certain degree, lead tolerance is higher in the plant, can gather in the crops in good time,, reach the purpose of lead contamination in the more thorough rehabilitating soil with convenient plantation once more.Generally, can before and after cordate houttuynia ripe (referring to the cordate houttuynia flowering), its whole perhaps rhizomatous plant of band portion be removed from lead-contaminated soil.
During results, according to situation such as lead contamination content in the soil, the part subterranean stem section that can gather in the crops is carried out cuttage, plantation once more; Perhaps the reserve part subterranean stem is treated to take out when plant next time again and is carried out cuttage in soil; Through in lead-contaminated soil, repeatedly planting cordate houttuynia, circulation is repaired, and until final remediating lead-contaminated soil, makes that lead content reaches environmental requirement in the soil.
The inventor finds also that through experimental study the cordate houttuynia plant has certain limit to the patience of lead content in the soil, and when soil lead concentration during greater than 3000mg/kg, phytomass obviously descends, root system patience index obviously reduces.Therefore, when cordate houttuynia is applied to the rehabilitating soil lead contamination, be the best results that is lower than 3000mg/kg with lead content in the lead-contaminated soil.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention comes the lead in the absorption extraction soil through plantation cordate houttuynia in lead-contaminated soil, permanently solves soil lead contamination problem.It is lower, workable to have energy consumption; Few to environmental perturbation, do not destroy soil physico-chemical property, do not cause secondary pollution; Cost is applicable to advantages such as large-area heavy-metal contaminated soil; And, when administering environment, its heavy metal of accumulating advanced technology also capable of using is reclaimed, thereby creates certain economic benefits.
Description of drawings
Fig. 1 shows embodiment 1 different lead concentrations and handles the biomass of the cordate houttuynia of gathering in the crops in the soil;
Fig. 2 show the different lead concentrations of embodiment 1 handle in the soil the cordate houttuynia of gathering in the crops to the individual plant accumulation and the enriching quantity of lead.
The specific embodiment
Below in conjunction with the specific embodiment foregoing invention content of the present invention is done further to describe in detail.
But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.Not breaking away under the above-mentioned technological thought situation of the present invention, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Embodiment 1
Present embodiment is the application of cordate houttuynia in the rehabilitating soil lead contamination, and concrete application process is following:
Soil sample is picked up from three nine-day periods after the winter solstice medicine company cordate houttuynia planting base, Yucheng District Yan Qiao town, Ya'an, rice soil.Soil sample is crushed through air-dry, and mixing behind 2 mesh sieves carries out soil and cultivates excessively.With Pb (NO
3)
20,250,500,1000,1500,2000,3000mg/kg (Pb supply soil is plumbous, establishes nine concentration of treatment:
2+), add water repeatedly, natural air drying; Cultivated three months so in advance.39.02,286.0,539.0,1039,1539,2039,3039mg/kg lead content is respectively in the soil:.Add inorganic fertilizer and (press N: P
2O
5: K
2O ratio is 1: 0.42: 2.37) make base manure, carry out pot experiment after air-dry.In the plantation in November, every processing repetition 4 times, every basin is adorned native 10kg, and four cordate houttuynia subterranean stems of the parallel plantation of every basin (cuttage) section (every section last 3 joints) satisfies moisture after the cuttage, cultivate in the solarium.Irregularly water, keep ground moistening, weeding.Ripe back results are claimed its biomass, and analyze the lead content of plant different parts.
Fig. 1 has shown the biomass of the cordate houttuynia of gathering in the crops in the different lead concentrations processing soil.When lead concentration in the soil＜2000mg/kg, the cordate houttuynia biomass does not have marked change, shows stronger patience; But when the lead contamination level was very high, promptly adding concentration was under the 3000mg/kg situation, and the cordate houttuynia biomass significantly descends.In addition, root system patience also can well reflect the patience of plant to heavy metal.Root system patience index is each root length handled and the ratio that contrasts root length, can well reflect the patience of plant to heavy metal.Table 1 has shown the patience index of cordate houttuynia underground rhizome under the different plumbous concentration of treatment.Root system patience index is all greater than 1 when plumbous concentration of treatment＜2000mg/kg, plumbous concentration of treatment when 3000mg/kg less than 1.Though explain all that below cordate houttuynia is strong but certain limit is arranged to the patience of lead, in other words, during greater than 3000mg/kg, phytomass obviously descends at the soil lead concentration.
Table 1 cordate houttuynia underground rhizome patience index
Fig. 2 has reacted different lead concentrations and has handled on the soil cordate houttuynia to the individual plant accumulation and the enriching quantity of lead; Can know that lead adds concentration when being 2000mg/kg; Lead content reaches 523mg/kg in the cordate houttuynia body; And plant is the highest to the individual plant cumulant of lead, reaches the 107.1ug/ strain, close with Sedum alfredii Hance (discovering that the environmental individual plant cumulant of the plumbous enrichment of Sedum alfredii Hance is the 108.0ug/ strain).Explain that cordate houttuynia has strong accumulation ability to lead, especially have very big reparative potential when the 2000mg/kg left and right sides for concentration of lead contamination in the soil.
Can find out that from the foregoing description cordate houttuynia has stronger patience and enriching to the lead in the soil, lead-contaminated soil is had stronger repair ability.
Claims (1)
1. the application of cordate houttuynia in the rehabilitating soil lead contamination, way are a large amount of plantation cordate houttuynias in by lead-contaminated soil, adopt subterranean stem segment cuttage method during the plantation cordate houttuynia or with the cultivation in strong sprout of subterranean stem section; Water according to soil lack of water situation in cordate houttuynia plantation back; After the cordate houttuynia maturation, gather in the crops, during results whole strain of cordate houttuynia or the rhizomatous plant of band portion are removed from lead-contaminated soil, will the part cordate houttuynia subterranean stem section of results be carried out cuttage, plantation once more simultaneously; Perhaps the reserve part subterranean stem is in soil; Treat to take out when plant next time and carry out cuttage, it is characterized in that: lead concentration is when the 2000mg/kg left and right sides in the soil, and cordate houttuynia is to being had good repair ability by lead-contaminated soil; After the cordate houttuynia maturation, gather in the crops; Whole or rhizomatous plant of band portion removes from lead-contaminated soil with it, and when lead concentration in the soil during greater than 3000mg/kg, its repairing effect is relatively poor.
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| CN2009103069455A CN101642770B (en) | 2009-09-14 | 2009-09-14 | Application of houttuynia cordata in restoring lead-polluted soil |
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| CN2009103069455A CN101642770B (en) | 2009-09-14 | 2009-09-14 | Application of houttuynia cordata in restoring lead-polluted soil |
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| CN103433273B (en) * | 2013-08-12 | 2014-11-05 | 四川农业大学 | Application of willow herb to remediation of heavy metal lead pollution in soil |
| CN109622604A (en) * | 2018-12-24 | 2019-04-16 | 北京农业智能装备技术研究中心 | A kind of method of phytoremediation lead-contaminated soil |
| CN109772879A (en) * | 2019-02-27 | 2019-05-21 | 广西壮族自治区农业科学院 | Application of the S. spontaneum in remediating heavy metal cadmium zinc-copper lead-contaminated soil |
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Non-Patent Citations (3)
| Title |
|---|
| 孟晓霞.鱼腥草对铅的吸收特性及耐性研究.《四川农业大学硕士论文》.2006,正文第7页下数第2段,第27页第2段第7行. * |
| 田永生等.鱼腥草及其栽培技术.《中国农村科技》.2007,(第1期),9-10. * |
| 胡小三.鱼腥草的栽培与妙用.《当代蔬菜》.2006,(第4期),39. * |
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