CN108555006A - A kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination - Google Patents
A kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination Download PDFInfo
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- CN108555006A CN108555006A CN201810023661.4A CN201810023661A CN108555006A CN 108555006 A CN108555006 A CN 108555006A CN 201810023661 A CN201810023661 A CN 201810023661A CN 108555006 A CN108555006 A CN 108555006A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000011109 contamination Methods 0.000 title claims abstract description 26
- 230000008439 repair process Effects 0.000 title claims abstract description 18
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 37
- 241000196324 Embryophyta Species 0.000 claims description 31
- 241000894007 species Species 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 235000004047 Amorpha fruticosa Nutrition 0.000 claims description 13
- 240000002066 Amorpha fruticosa Species 0.000 claims description 13
- 235000003145 Hippophae rhamnoides Nutrition 0.000 claims description 12
- 235000016677 Lespedeza bicolor Nutrition 0.000 claims description 12
- 240000000604 Lespedeza bicolor Species 0.000 claims description 12
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- 238000012545 processing Methods 0.000 claims description 7
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- 238000003306 harvesting Methods 0.000 claims description 3
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- 238000009331 sowing Methods 0.000 claims description 2
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- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000005067 remediation Methods 0.000 abstract description 3
- 230000001976 improved effect Effects 0.000 abstract description 2
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 23
- 241000229143 Hippophae Species 0.000 description 10
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Natural products OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 5
- 230000035784 germination Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
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- 238000011065 in-situ storage Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
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- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 description 1
- PXRKCOCTEMYUEG-UHFFFAOYSA-N 5-aminoisoindole-1,3-dione Chemical compound NC1=CC=C2C(=O)NC(=O)C2=C1 PXRKCOCTEMYUEG-UHFFFAOYSA-N 0.000 description 1
- 240000006891 Artemisia vulgaris Species 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000124033 Salix Species 0.000 description 1
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- 229920002892 amber Polymers 0.000 description 1
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- 230000035558 fertility Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
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- 238000002386 leaching Methods 0.000 description 1
- 229940046892 lead acetate Drugs 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
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- 230000008635 plant growth Effects 0.000 description 1
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- 231100000614 poison Toxicity 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
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- 235000009566 rice Nutrition 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mycology (AREA)
- Soil Sciences (AREA)
- Biotechnology (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Botany (AREA)
- Processing Of Solid Wastes (AREA)
- Cultivation Of Plants (AREA)
Abstract
The present invention provides a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination：The big lead concentration type shrub of plantation drought resisting, resistance to lead, biomass on arid, semiarid region basic soil lead contamination soil applies NTA in the Growing season of shrub to soil, and the applied amount of NTA is the 0.1%~0.25% of wind desiceted soil quality.The present invention uses the heavy metal lead being largely passivated in chelating agent NTA activated alkaline soil, to repair 0~80cm depth soil layer lead-contaminated soils, shrub is significantly improved to the constant absorption of heavy metal-polluted soil lead contamination, extraction repair ability and remediation efficiency, and it is water-saving, at low cost, environmental benefit is good.The present invention is of great significance to repairing the discarded ground heavy metal-polluted soil lead contamination of Northwest arid district Pb-Zn deposits industry.
Description
Technical field
The invention belongs to heavy metal pollution of soil to administer field, relate generally to a kind of drought-hit area basic soil heavy metal lead pollution
Administering method.
Background technology
Currently, with the fast development of industrial sector, day the problems such as ecological disruption, environmental pollution caused by Mining Development
It is beneficial serious.There are 27 province, district and city to find in China and reconnoitred Pb-Zn deposits reserves, wherein total reserves of 10 provinces, area account for entirely
The 80% of state's lead reserves.Mining soil is the most important surrounding medium of heavy metal pollution simultaneously, and heavy metal pollution of soil is one
The irreversible pollution course of kind, heavy metal pollution not only impacts the growth of plant, also by food chain in human body
Enrichment, causes various diseases, influences health.Therefore it is always international environment that Mining Wasteland heavy metal pollution of soil, which is administered,
One of difficult point and hot issue of scientific and technical research.
In the improvement of heavy metal-polluted soil lead contamination, the restorative procedure of physical/chemical etc. is generally used, successively the row of exploring
Local method, heavy metal pollution of soil, deep ploughing, thermal desorption method, heat treating process, electrochemical process and chemical flush method, chemical in situ deactivation method etc..To the greatest extent
Managing these methods all has certain reparation improved effect, but all has some limitations.If physical method freight volume is big, at
This height, and the secondary pollution of soil can be caused；Chemical method can change soil property, and soil fertility is made to reduce, and exist easy
Decomposition, effect be not lasting；The pollution that chemical in situ deactivation method is generally only applicable to the lesser extent caused by rural activity is controlled
Reason, and heavy metal ion still also remains in soil environment, the change such as environmental condition is lacked in the presence of activation etc. again
Point.Accordingly, it is difficult to large-scale promotion application.
There is the utilizing enriching plant in repairing lead polluted soil of accumulation ability to have great advantage using to heavy metal, but has now been found that
Heavy metal lead super enriching plant there was only several herbaceous plant, not only plant is short and small, biomass is low, absorb total metals have
It limits and is mainly distributed on middle subtropical zone humid region and acid soil area, there is and distribution model high to life condition requirement
The defects of narrow is enclosed, there is certain limitation in the practical application of remediating lead-contaminated soil.It is, thus, sought for and developing it
The plant that it is drought-enduring, lead resistance is strong repairs arid and semiarid mining area basic soil lead contamination.
For herbaceous plant, xylophyta mainly has following advantage in soil remediation：(1) Root Distribution it is deep and
Extensively：The main Root Distribution depth of most shrubs is within 2m, and Root morphology is conducive to network fixing soil, reduces water
Soil is lost in the heavy metal-polluted soil secondary pollution brought, can be repaired to the contaminated soil of Pb-Zn ore district deep layer.(2) biomass
Greatly：According to Lewandowski etc. (2006), the dry matter weight of aerial parts of the annual per hectare of wormwood artemisia willow uses heavy metal up to 10-14t
The total metals of concentration type xylophyta extraction are considerably beyond super enriching plant.(3) resistance is strong：Xylophyta has relatively strong
Drought resisting, resistance to lead and enriched lead ability, herbal deficiency can be made up in terms of remediating lead-contaminated soil, it is preferably net
Change lead-contaminated soil.
Presently found lead enriching plant is simultaneously few, and both originates from moist area of southern China, it is difficult to adapt to northwest arid climate.
Lead often exists with divalent indissoluble object in soil, such as Pb (OH)2Deng in the soil it is difficult to migration.South is because soil is in acidity, in addition
Acid rain is invaded so that the transfer ability of lead in the soil is bigger than the north, it is easier to be absorbed by plants extraction.And the north is mostly alkalinity
The solubility of soil, lead is low, not easy to migrate, increases the difficulty of plant absorption extraction, reduces the efficiency of phytoremediation.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of NTA cooperation shrub species to repair the dirt of drought-hit area basic soil lead
The method of dye.The present invention utilizes the chelating agent lead concentration type big to the activation and drought resisting of heavy metal-polluted soil lead, resistance to lead, biomass
Absorption, transfer and extraction of the shrub species to heavy metal lead, to reach the purpose for repairing drought-hit area basic soil lead contamination.
In order to achieve the above objectives, present invention employs following technical schemes：
The method of the reparation drought-hit area basic soil lead contamination, includes the following steps：In arid and semi-arid area basic soil lead
Contaminated land plant drought resisting, resistance to lead and lead concentration type shrub species, it is multiple to the soil in the Growing season of planted shrub
Applying NTA, (nitrilotriacetic acid, molecular formula are N (CH2COOH)3), the applied amount of NTA is the 0.1%~0.25% of wind desiceted soil quality,
Soil total amount is calculated according to cultivated area (contaminated area) and pollution soil thickness (depth), can be determined according to above-mentioned mass ratio
Chelating agent NTA is in the applied amount of Growing season.
Preferably, the soil climate environment is 1.5≤k≤16 (i.e. arid and semi-arid area), soil drought, but soil 0
The relative water content of~60 cm layer of soil is not less than 40%, and soil pH is more than 7.5, and is less than or equal to 9.0.
Preferably, the shrub is selected from sea-buckthorn (Hippophae rhamnoides Linn.), false indigo (Amorpha
Fruticosa Linn.), the biomass such as shrub lespedeza (Lespedeza bicolor Turcz.) are big, resistance to stump, drought resisting, resistance to lead
And the shrub species that lead accumulation ability is strong.
Preferably, content of heavy metal lead≤8000mg/kg of the soil.
Preferably, the NTA applies several times in shrub Growing season, until reaching the applied amount, to prevent to shrub
Damage (such as burn seedlings occurs etc.) or reduction repairing effect.
Preferably, the NTA applies be spaced within the scope of 1~30 day every time；It applies soil depth and is no more than soil pollution
Layer thickness is less than 80 centimetres (the main Root Distribution depth of shrub).
The method for repairing drought-hit area basic soil lead contamination is further comprising the steps of：The shrub is after Growing season
Stump is carried out, the fallen leaves that stump branch, leaf and daily management are collected are both needed to collect heavy metal lead after high temperature ashing processing.
The method for repairing drought-hit area basic soil lead contamination specifically includes following steps：
1) uniform stationing, layering acquisition 0-100 cm layer of soil soil samples；
2) Content of Pb in Soil is measured；Determine heavy metal lead pollution soil thickness；Determination of Pb was with reference to Chinese ring in 1992
Border monitors master station and compiles《The modern age analysis method of soil element》；
3) soil pH value is measured；
4) relative water content for measuring 0-60 cm layer of soil soil is layered before plantation；
5) if the moisture, pH value of heavy metal lead pollution soil, content of heavy metal lead meet the shrub tree for reparation
When the sprouting of kind seed or growth conditions, then shrub species is sowed or transplanted, Routine Management is carried out after plantation；
6) in the shrub season of growth, apply NTA (nitrilotriacetic acid) to the 0.1%~0.25% of wind desiceted soil quality several times,
Apply interval every time 1~30 day；
7) shrub is every year by cradling stump at least once；
8) fallen leaves that harvest partly and in daily management is collected extract heavy metal lead through high temperature ashing processing.
Beneficial effects of the present invention are embodied in：
Chelating agent is combined by the present invention with phytoremediation, and it is convenient that used chelating agent NTA removes application, and dosage is low, nothing
Outside secondary pollution, what is more important utilizes activation of the chelating agent NTA to heavy metal-polluted soil lead, and in efficiently activation heavy metal
Dosage section in, murder by poisoning is not generated to rehabilitation plant, to which the lead concentration type shrub for keeping drought resisting, resistance to lead, biomass big has
For continuous, the efficiently concentrating ability of heavy metal lead in the basic soil of drought-hit area.Compared with the chelating agents such as common EDTA, to planting
Object, the toxicity of microorganism are low, and secondary pollution will not be caused to environment；With chelating agent CA (citric acid), EDDS (two ambers of ethylenediamine
Acid) it compares, to the biological effectiveness higher of the shrub, the Pb transfer ratios higher (weight of biotransport coefficient=aerial part
The content of beary metal of tenor/under ground portion).In addition, plant (shrub) is repaired handles contaminated soil in situ, environment is disturbed
It is dynamic few, avoid the destruction to soil texture；And xylophyta (shrub) itself is to improving arid and semi-arid area ecological environment, protecting
Water holding soil is checked winds and fixed drifting sand and is afforested and beautified with irreplaceable role.It is water-saving, repair compared with traditional physical chemistry technology
Multiple effect is more preferable, cost is lower, manages and protects simple, non-secondary pollution, and environmental benefit is good.The present invention is for repairing arid region of Northwest China alkalinity
Heavy metal-polluted soil lead contamination is of great significance.
Further, shrub species sea-buckthorn, false indigo, the shrub lespedeza used in the present invention has drought resisting, resistance to lead, biology
Measure the features such as big and very strong lead accumulation ability.
Further, according to shrub plant and growth characteristics, and the use of chelating agent is combined, present invention is particularly suitable for reparations
0~80cm depth lead contamination soil layers can repair the soil that lead tolerance is not higher than 8000mg/kg.
Description of the drawings
Fig. 1 is that chelating agent NTA amounts of application are averaged to plant the influence of lead content.
Fig. 2 is influence of the drought stress to seed relative germination rate.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.
The present invention provides a kind of restorative procedure adapting to drought-hit area basic soil heavy metal lead pollution.Specifically with according to《Soil
Environmental quality standards GB 15618-1995》Belong to pH ＞ 6.5, the three-level of lead concentration ＞ 500mg/kg and its above heavy metal lead
For contaminated soil.Drought ranging from 1.5≤k≤16, i.e. arid and semi-arid area, soil pH are 7.5 pH≤9.0 ＜ (alkali
Property), the heavy metal lead in soil is easy to be fixed, plant is not easy to absorb.
The shrub species such as false indigo, sea-buckthorn, shrub lespedeza are planted when reparation, and apply chelating agent NTA (ammonia in shrub Growing season
Triacetic acid), the harvest season cradles stump.
Wherein, sea-buckthorn, false indigo, shrub lespedeza biomass be big, well developed root system, has stronger drought resistance, lead resistance and richness
Collect the ability of heavy metal lead.In the selection of chelating agent, selected degradability is stronger and environment amenable chelating agent NTA,
It has repairs seeds bio-toxicity is small, biological effectiveness is high, degradability is strong, reinforcing repairing effect is good etc. to selected shrub
Feature.The occurrence status of heavy metal in soil can be changed by applying chelating agent NTA into the basic soil of heavy metal lead pollution, greatly
The big heavy metal activated in soil effectively increases the energy that the shrubs such as false indigo, sea-buckthorn, shrub lespedeza absorb heavy metal in soil
Power.The chelating agent NTA of suitable concentration (referring specifically to following experiment) can enhance the dissolubility of lead, lead with the lead in activating soil
It is combined with chelating agent and epidermis is diffused through by cross-film after forming metallo-chelate and cortex enters in root, transported in root symplast
Aerial part defeated and that plant is transferred to by xylem.Promote plant to the absorption transfer ability of lead, extremely significantly improves
Lead content in plant enhances the plant remediation ability of drought-hit area basic soil heavy metal lead pollution.
Example 1：Chelating agent is tested using concentration screening
Prepare soil sample, lead acetate solid powder is added, it is 15000mg/kg to make soil sample external source lead content, and mixing is passivated 2
Month, soil sample is packed into cultivation tray, per basin 5kg containing wind desiceted soil.For trying shrub (sea-buckthorn, false indigo, shrub lespedeza) seed disinfection, leaching
Bubble, is seeded into leaded soil sample, and control soil relative water content is 60% or so, is cultivated in greenhouse.It is contained when growing to growth
When the phase, chelating agent NTA is added in three times, 5 different applied amounts levels are set, not apply chelating agent as blank control.In life
The long end of term measures plant plant height, ground diameter, detaches plant above ground and under ground portion, takes out root system, washes root, measures roots oxidizing point
Cloth weighs each section biomass, measures plant each section and absorbs fixed lead content.
Referring to Fig. 1, potted plant experiment is shown, is wind desiceted soil quality when chelating agent NTA applies total amount after sowing 6 months
When 0.1%~0.25%, selected shrub root, stem, leaf lead content be all remarkably higher than blank control or other applied amounts processing, point
Do not increase 100.25%~127.10% than not applying the blank control of chelating agent, 336.24%~509.02%,
178.50%~327.18%；The transfer ratio of Plant Leaf is 1.40~3.72 times of blank control, and the concentration coefficient of root is sky
1.96~2.25 times compareed in vain.
Under conditions of applying chelating agent, to plant height, ground diameter, Root morphology without substantially changeing, root system can for above-mentioned processing
Normal growth, root long, biomass illustrate that the application of chelating agent NTA does not have an impact the growth for trying shrub species all without reduction.
NTA applications are suggested：
1) seed is broadcast live, current year chelating agent applies depth and is less than 20 centimetres.
2) annual, biennial seedling is transplanted, current year chelating agent applies depth and is less than 50 centimetres.
3) life in 3 years and the above forest land, current year chelating agent apply depth and are less than 80 centimetres.
4) NTA apply and can carry out with pouring water (control soil 0-60 cm layer of soil relative water contents be not less than
40%) chelating agent, is mixed into tank (iron sheet barrel etc.) when pouring, trickle irrigation to carry out, but must strictly calculate, control moistening thickness
It spends (irrigation quantity).
Example 2：Shrub seeds lead resistance tests (germination test)
It is designed using randomized block experiment, lead mixing is added in basic soil, setting 0~15000mg/kg lead contents
Different disposal, passivation culture 60 days, is distributed into glass culture dish.The shrub species such as false indigo, shrub lespedeza, sea-buckthorn are selected, are sterilized,
It impregnates, then sows into culture dish, cultivated in indoor illumination incubator, artificial Weighing control moisture.
The results show that in the range of 0~4000mg/kg lead contents, false indigo, the percentage of seedgermination of sea-buckthorn, vigor refer to
Number variation unobvious (P>0.05)；Seedling stem length and fresh weight are also without significant change (P>0.05).Contain in 4000~8000mg/kg lead
In the range of amount, lead has certain inhibiting effect to the germination of seed and each index of growth of seedling, but influence degree is because of plant species
It is different and different, the seeds of some seeds can normally germinate, plant can normal growth, show very strong resistance to metallic lead and poison energy
Power.These shrub species (sea-buckthorn, false indigo, shrub lespedeza) can be used as the seeds of lead-contaminated soil reparation.
Example 3：Shrub seeds drought tolerance tests (germination test)
Plant seed germination or growth of seedling stage are its resistance most weak stages.Using manual control soil moisture,
Simulate the earth culture experiment of different drought stress.Different in moisture gradient is set, selects seed, is seeded into and fills different moisture content soil
Culture dish in, cultivated in indoor incubator, during which artificial Weighing control moisture does not apply any fertilizer.
The results show that in the range of soil relative water content 40%~100%, can germinate for examination shrub seeds, phase
To germination percentage all 60% or more, seedling root long, stem length, fresh weight are with the reduction of relative water content, and taper off trend, but change not
Obviously (P<0.05), inhibiting effect is smaller, illustrate selected several shrub species (sea-buckthorn, false indigo, shrub lespedeza) all have compared with
Strong drought resistance.Therefore, under drought condition of the soil relative water content not less than 40%, selected several shrub species also may be used
Normal growth is used for remediating lead-contaminated soil (Fig. 2).
The cost of remediating heavy metal lead-contaminated soil (topsoil) of the present invention is about 8292 yuan/and (mu year), i.e., it often puts down every year
The processing cost of square rice contaminated soil is about 12.5 yuan/year.The expense is less than at the physical-chemical process eluted using NTA
(chemical method is eluted the 0.35% of reason expense using NTA, is reached elution effect and is disregarded artificial, every square metre of need of water about 3600
Member, and bring very big secondary pollution and soil erosion).Further, it is also possible to recycle a huge sum of money from the plant residue rich in heavy metal
Belong to, obtains direct economic benefit.
The present invention is applicable to remediating heavy metal lead-contaminated soil, and meets the weather, edaphic condition and described
Plant can grow area, such as Northwest arid district with lead be main heavy metal pollution Pb-Zn deposits industry it is discarded grade lead-contaminated soils.
Claims (8)
1. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination, it is characterised in that：The reparation drought-hit area alkali
The method of property Lead Pollution in Soil, includes the following steps：Drought resisting, resistance to lead are planted in arid and semi-arid area basic soil lead contamination soil
Lead concentration type shrub, apply NTA to the soil in the Growing season of the shrub, the applied amount of NTA is wind desiceted soil quality
0.1%~0.25%.
2. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination according to claim 1, feature
It is：The relative water content of 0~60 cm layer of soil of the soil is not less than 40%, and soil pH is more than 7.5, and is less than or equal to
9.0。
3. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination according to claim 1, feature
It is：The Content of Pb in Soil in the lead contamination soil is no more than 8000mg/kg.
4. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination according to claim 1, feature
It is：The shrub is selected from sea-buckthorn (Hippophae rhamnoides Linn.), false indigo (Amorpha fruticosa
) or shrub lespedeza (Lespedeza bicolor Turcz.) Linn..
5. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination according to claim 1, feature
It is：The NTA should apply several times in shrub Growing season, until reaching the applied amount.
6. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination according to claim 1, feature
It is：The soil depth that the NTA is applied should be no more than Lead Pollution in Soil layer thickness or be less than the main Root Distribution depth of shrub.
7. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination according to claim 1, feature
It is：The method for repairing drought-hit area basic soil lead contamination is further comprising the steps of：The shrub answers after Growing season
Stump is carried out, heavy metal lead is collected after the ashed processing of stump branches and leaves.
8. a kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination according to claim 1, feature
It is：The method for repairing drought-hit area basic soil lead contamination specifically includes following steps：
1) layering acquisition 0-100 cm layer of soil soil samples；
2) Content of Pb in Soil for measuring each layer soil sample, determines heavy metal lead pollution soil thickness；
3) soil pH value is measured；
4) water-retaining quantity among field of soil is controlled, the soil relative water content of layering measurement 0-60 cm layer of soil before planting；
If 5) soil relative water content, pH and lead content simultaneously meet shrub seeds sprout or plant strain growth condition, sowing or
Transplant shrub species；
6) in the shrub season of growth, apply NTA several times, apply be spaced within the scope of 1~30 day every time, until applied amount reaches wind
The 0.1%~0.25% of dry ground quality；
7) the annual stump of shrub is at least once；
8) the shrub branch, leaf and the fallen leaves of daily collection of stump harvest, heavy metal lead is extracted after needing ashed processing.
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