CN108971210A - A kind of plant restoration method of heavy-metal contaminated soil - Google Patents
A kind of plant restoration method of heavy-metal contaminated soil Download PDFInfo
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- CN108971210A CN108971210A CN201810700962.6A CN201810700962A CN108971210A CN 108971210 A CN108971210 A CN 108971210A CN 201810700962 A CN201810700962 A CN 201810700962A CN 108971210 A CN108971210 A CN 108971210A
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- amaranthus
- soil
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention proposes a kind of plant restoration methods of heavy-metal contaminated soil, contaminated soil plot is disposed, heavy metal super-enriched plant Grain Production of Amaranthus kind is planted, thinning is carried out according to emergence, is filled the gaps with seedlings, field management is made according to weeds in field and insect pest situation in entire growth period, after Grain Production of Amaranthus growth, trace-element fertilizer is subjected to foliage spray fertilising, harvests Grain Production of Amaranthus, carry out stack retting, the residue that pile fermentation is reduced, transfer are filled, and are laid with geomembrane before filling and are carried out antiseepage.The present invention passes through plantation Grain Production of Amaranthus, the heavy metals such as cadmium, the lead on pollution plot are sponged, the content of heavy metal in soil are effectively reduced, and Grain Production of Amaranthus can complete normal growth cycle, and can be by cradling, germinating into next growth cycle, improve contaminated soil is repaired effect.
Description
Technical field
The present invention relates to restoration of the ecosystem fields, and in particular to a kind of plant restoration method of heavy-metal contaminated soil.
Background technique
China is faced with resource-type and water quality type water shortage Double jeopardy, in the case where shortage of water resources, in order to ensure agriculture
Industry production, many places are passively irrigated using sewage.It is investigated according to Ministry of Water Resources, China's sewage irrigation area in 1991 is 4600
Ten thousand mu, up to 54,270,000 mu, account for about the 7.3% of national total irrigated area within 2004.A large amount of raw sewerages are directly used in
Field irrigation pays through the nose for it although solving the matter of great urgency of some regional water shortages.Sewage irrigation makes to pollute
Object especially heavy metal largely remains in the soil, directly affects the structure and function of soil ecosystem, makes biotic population knot
Structure changes, and bio-diversity is reduced, and soil productivity decline, soil physico-chemical property deteriorates, and influences plant growth, causes
Crop production reduction and agricultural product quality decline, constitute a threat to ecological environment, food safety and agricultural sustainable development, soil is dirty
The overall situation of dye is quite severe.
Main means are administered in heavy metal pollution farmland phytoremediation, heavy metal-polluted soil passivation, elution, soil moved in improve the original etc., wherein
First two project plan comparison has actual application prospect, and elution often has secondary pollution problem, and soil moved in improve the original is unsuitable for the farmland of vast area.And
Phytoremediation has several working mechanisms, including plant extract, phytovolatilization and plant filtering etc., has with plant extract more real
Application potential and obtain a certain range of application practice, that is, utilize heavy metal accumulation plant absorption heavy metal in soil, harvest
After be disposed (burn, landfill etc.), to reach the target for removing heavy metal in soil.The key of this technology is to find tool
There is the plant (commonly referred to as super enriching plant) of enough accumulation abilities, while there is good practice operability.Currently, discovery
The super enriching plant of report is very more, but the plant with practical application potentiality is then very limited.Chen Tongbin etc. (2002, science
Notification) have found that ciliate desert-grass (Pteris vittata L) has extremely strong arsenic accumulation ability, the enrichment system of arsenic under field condition
Number reaches 70-80, and blade arsenic content is up to 5070mg/kg.Yang Xiaoe etc. (2002, Science Bulletin) has found Sedum alfredii Hance (Sedum
Afredii) be a kind of zinc super enriching plant, internal zinc concentration up to 4515mg/kg, this later plant be proved to compared with cadmium,
Lead also has stronger accumulation ability.Indian mustard (Brassica juncea) is reported in the world to the efficiently concentrating of cadmium lead
(Blaylock 1997), overground part cadmium content is up to 2800mg/kg, and lead is up to 15000mg/kg, but domestic some tests are shown
Indian mustard has no so high accumulation ability (Wang Jiqing 2004), and overground part cadmium concentration only has 6mg/kg, even if addition EDTA
Complexing agent, enriching quantity are also no more than 14mg/kg.Penny cress (Thlaspi Caerulescens L, Shen Zhen state 2000) is found
It is the super enriching plant of zinc cadmium, 218-16655mg/kg containing zinc, leaded 409-6025mg/ is detected under natural growthing condition
Kg, 4-118mg/kg containing cadmium, the detected value of another report are zinc 6503-35790mg/kg, lead 6919-90306mg/kg, cadmium
10-588mg/kg, but this plant growth is slow, and the upperground part biomass is small, and equally, domestic some tests, which are not also shown, to be held back
The high cadmium zinc accumulation ability of blue dish.Furthermore corn, sunflower, specific rice varieties etc. also have certain heavy metal accumulation energy
Power.The super enriching plant type reported at present is very more, but mentioned kind is the most famous, has obtained in-depth study and certain
Application practice, however, not formed widely applied technological means at present, each super enriching plant has centainly using upper
Defect, including biomass is small, slow growth, is difficult in grown in field, breeding difficulty etc., some to repair according to what remediation efficiencies calculated
The multiple time, this can not be promoted and applied in China at 5 years or more or even more than 10 years.
The passivation of another heavy metal-polluted soil, by Li Zhi peace, various heavy enriching plant has screened in research team, wherein
It was found that Grain Production of Amaranthus there is huge application potential (Li 2009), cadmium concentration coefficient is generally higher than 30, soil cadmium content 5mg/kg
When, internal cadmium content is up to 200mg/kg, although this content is lower than the enriching plant of some other reports, it has life
Object amount is huge, easy cultivation, is suitable for the features such as farm environment growth, to have more practical application, the property of Grain Production of Amaranthus cadmium
Can be highly stable, it can plant primary, repeatedly cradle germinating item, germinate the cadmium content of item and grow directly from seeds item not less than a generation, this is special
Sign can be substantially reduced using upper cost, improve remediation efficiency.
It is most of to remain in laboratory although Grain Production of Amaranthus is current southern area most application potential cadmium rehabilitation plant
Conceptual phase, the difference for handling disposition, agro-farming measure adjustment and farming method in soil plot is for Grain Production of Amaranthus cadmium
The heavy metals such as lead also have certain influence.
Summary of the invention
The present invention in order to overcome at least one of the drawbacks of the prior art described above (deficiency), provides a kind of specific using planting
Grain Production of Amaranthus kind, to effectively realize the plant restoration method for reducing the content of beary metal such as cadmium, lead in soil.
In order to solve the above technical problems, technical scheme is as follows:
A kind of plant restoration method of heavy-metal contaminated soil is disposed to contaminated soil plot, a plantation huge sum of money
Belong to super enriching plant Grain Production of Amaranthus kind, thinning is carried out according to emergence, is filled the gaps with seedlings, in entire growth period according to weeds in field and worm
Evil situation makees field management, after Grain Production of Amaranthus growth, fertilizer is carried out foliage spray fertilising, harvests Grain Production of Amaranthus, stack retting is carried out, by heap
The residue of fermentation decrement is macerated, transfer is filled, and geomembrane, which is laid with, before filling carries out antiseepage, specifically includes the following steps:
S1. soil and seeds are chosen, and make smooth processing to soil；
S2. preceding pretreatment is sowed to seed and soil respectively, seed and soil is made to reach planting requirement；
S3. it sows；
S4. field management；
S5. it applies fertilizer in Grain Production of Amaranthus growth period to it, then harvests Grain Production of Amaranthus, carry out stack retting, and fill；
By the characteristic using plantation Grain Production of Amaranthus, allows in the heavy metal accumulation Grain Production of Amaranthus in soil, then will absorb again
The Grain Production of Amaranthus stack retting of heavy metal fills, and improves the structure and function of soil ecosystem, increases bio-diversity and reduces, improves soil
Earth productivity, soil physico-chemical property are improved, and the performance of Grain Production of Amaranthus cadmium is highly stable, can be planted once, more
It is secondary to cradle germinating item, germinate the cadmium content of item and grow directly from seeds item not less than a generation, this feature can be substantially reduced using upper cost, be mentioned
High remediation efficiency.
Further, seed selected by the step S1 is the Grain Production of Amaranthus seed of fighting drought, and selected soil is by
Low-concentration heavy metal contaminated soil plot, it is described to soil make it is smooth processing include plowing to soil, dry field 1-5 days,
Hack makes agglomerate fragmentation again, in the process, to soil application calcium silicates and lime formula materials and routinely crop planting dosage
Base manure is applied, stands 2-6 days, the organic composite fertilizer containing microelement is applied, mixes organic composite fertilizer and soil uniformly.
Further, described to soil application calcium silicates and lime formula materials soil application 100-300kg per acre, 1-2 days
Soil application 50-150kg calcium silicates and lime formula materials per acre afterwards.
Further, the step S2 is sowing the last week to spread seed out to dry 1-4 days to the pretreatment of seed, by fine sand
It is mixed with Grain Production of Amaranthus seed；The pretreatment to soil includes that field irrigates bottom water, and broadcasting external crucible soil will reach loose, thin
It is broken, smooth, bottom water is poured, bed soil is 5-15 centimetres, and it is 5-10 centimetres that watering, which drenches, again sprinkled with conducive to germination after sprinkling profoundly water
Nutrition Soil；Then to field ridging, to field from centre toward two sides piecemeal ridging, the width on each ridge is 1.5-2.5 meters, often
The farming sidewalk of 10-50 centimetres of height, 30-70 centimetres wide is reserved between one ridge.
Further, the step S3 sowing selection calm fine day that warms up is sowed with drill for sowing in lines, depth 3- when sowing
10 centimetres, 10-30 centimetres of spacing in the rows, 20-60 centimetres of line-spacing, every cave 2-8 seeds, drill for sowing in lines earthing thickness wants uniformity,
It is stifled tight with wet mud at gap, keep having higher temperature and humidity in bed.
Further, the field the S4 processing includes with the next stage:
A1. thinning and intertillage: Grain Production of Amaranthus emergence after, look into seedling in time, fill the gaps with seedlings, when seedling grow tall 5-15 centimetres when start between
Seedling, every cave stay one plant of seedling, it is ensured that retain 2000-6000 plants or so per acre, and make to intertill for the first time, cleared weeds；When plant is long
It higher than 0.8-1.2 meters, then intertills once, and earths up in plant root, prevent from lodging, can be intertilled according to practical growing state
1-3 times, spring wants timely watering Irrigation when encountering damage caused by a drought；
A2. training is pruned: Grain Production of Amaranthus branch is more, the good plant of growth and development, based on prosperous growth, early stays fringe, stays more
Fringe；Weak strain should select the best florescence to stay fringe based on promoting to grow；When Grain Production of Amaranthus seedling grows to 6-12 piece leaf, side shoot is destroyed, is grown to
When 4-8 inflorescence, side shoot is all destroyed, every plant is stayed 4-8 inflorescence；
A3. fertilizer and water management: timely watering Irrigation when dry season, when rainy season, drain flooded fields in time；Growth full period top dressing 1-4 times, one mu
Grain Production of Amaranthus applies 2-6 kilograms of urea or 10-20 kilograms of ammonium bicarbonate every time, applies respectively in Seedling Stage and after buddingging；
A4. prevent and treat pest and disease damage: discovery has pest and disease damage after emergence, sprays insecticide；There is disease, then processing in time；
A5. Grain Production of Amaranthus cradles: starting to cradle utilization when 80-180 centimetres of plant height, the height for the stubble left is 20-40 centimetres, germinating
Continuous length cradled once to obtain huge biomass every 15-35 days, improves and remove cadmium amount.
Further, the S5 applies fertilizer to Grain Production of Amaranthus, foliage dressing is carried out in Grain Production of Amaranthus growth period, respectively in Grain Production of Amaranthus
At 40-90 centimetres, 100-130 centimetres of plant height, fertilizer is subjected to foliage spray.
Further, the fertilizer is trace-element fertilizer, fertilizing standards 0.03-0.08%CuSO4And 0.05-0.15%
MnSO4And 0.05-0.15%ZnSO4Mixture.
Further, the Grain Production of Amaranthus of the S5 harvest back need to carry out stack retting landfill disposal, adjoin in phytoremediation trial zone
At least one stack retting pond is established in position, and the heavy metal accumulation plant of harvest back is placed in pond and carries out conventional stack retting, pond Nei Pu
If geomembrane.
Further, 0.03-0.08g biology is added by 0.8-1.2kg Grain Production of Amaranthus in stack retting in the Grain Production of Amaranthus of the harvest
Microbial inoculum, stack retting time are 2-6 days, are reduced Grain Production of Amaranthus quickly, and the residue that will be reduced through pile fermentation is added for administering weight
Be mixed after the flyash stabilizer of metallic pollution, be transferred to hawthorn or mining source region landfill, fill before be laid with geomembrane into
Row antiseepage.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
(1) the Grain Production of Amaranthus kind that the present invention uses, can complete just on low concentration pollution plot in the heavy metals such as cadmium, lead
The content of heavy metal in soil is effectively reduced in normal growth cycle.
(2) rational close planting is carried out in Grain Production of Amaranthus planting process due to the present invention, training is pruned, cultivation and banking, blade face are applied
The means such as fertilizer manage the growth cycle of Grain Production of Amaranthus, and can improve Polluted Soil by cradling, germinating into next growth cycle
Earth is repaired effect.
(3) Grain Production of Amaranthus of harvest back is carried out concentration stack retting, heavy metal stabilization and antiseepage landfill disposal by the present invention, is reduced
The volume of Grain Production of Amaranthus cutting, and further reduced the solubility and migration of the heavy metals such as cadmium, lead, it can evade because of weight
Metal ion shifts bring secondary hazards.
Specific embodiment
The present embodiment only for illustration, should not be understood as the limitation to this patent；
Below with reference to embodiment, the following further describes the technical solution of the present invention.
Embodiment 1
The invention proposes a kind of plant restoration method of heavy-metal contaminated soil, method is to contaminated soil plot
It is disposed, plants heavy metal super-enriched plant Grain Production of Amaranthus kind, specifically includes the following steps:
S1. soil and seeds are chosen, and make smooth processing to soil；
S2. preceding pretreatment is sowed to seed and soil respectively, seed and soil is made to reach planting requirement；
S3. it sows；
S4. field management；
S5. it applies fertilizer in Grain Production of Amaranthus growth period to it, then harvests Grain Production of Amaranthus, carry out stack retting, and fill.
The seed wherein chosen is full grains, the Grain Production of Amaranthus seed of fighting drought, kind K112；The soil of selection be by
Middle low-concentration heavy metal contaminated soil plot.
After seed and soil have all been chosen, smooth processing just disposed to soil plot, the step of processing is as follows: solarization of plowing
Field 2-3 days, rotary cultivator hack make agglomerate fragmentation, in operation process, apply calcium silicates and lime formula materials, every 200kg mono-
Mu strengthens every mono- mu of 100kg of application after 2 days, and routinely crop planting dosage applies base manure；3-5 days are stood, application contains
The organic composite fertilizer of microelement, rotary cultivator are mixed soil, i.e. the disposition of completion field.
And prior to seeding, preceding pretreatment is sowed to seed, spreads seed out sunning 2-3 days within one week prior to seeding；To keep away
Exempt to cause sowing too intensive because seed is too small, is uniformly mixed fine sand with Grain Production of Amaranthus seed before sowing.
Pretreatment includes: that field irrigates bottom water before sowing to soil, because broadcasting external crucible soil will reach loose, fine crushing, flat
Whole, pouring bottom water will suitably, and general 9 centimetres of bed soil, drenched 8 centimetres of watering most suitable；After sprinkling profoundly water, a thin layer of battalion is spread
Soil is supported, germination is conducive to；Then field ridging, with ridger to field from centre toward two sides piecemeal ridging, each ridge
Width is about 1.8-2.0 meters, and length reserves the farming of 20-30 centimetres of height, 40-60 centimetres wide with boundary of land block between each ridge
Sidewalk.
It finishes before sowing after pretreatment, then is sowed respectively with soil in seed, sowing selects the calm fine day that warms up
It is carried out with drill for sowing in lines, 5-7 centimetres of depth when sowing, 15-25 centimetres of spacing in the rows, 40-60 centimetres of line-spacing, every cave 3-5 seeds, drilling
Machine earthing thickness also wants uniformity.It is stifled tight with wet mud at gap, keep having higher temperature and humidity in bed, with benefit emergence.
It has carried out it is necessary to carry out field management after sowing, field management mainly includes thinning and intertillage, training are pruned,
Fertilizer and water management, prevention and treatment pest and disease damage and Grain Production of Amaranthus cradle.
After wherein thinning and intertillage refer to Grain Production of Amaranthus emergence, look into seedling in time, fill the gaps with seedlings, when seedling grow tall 8-10 centimetres when start
Thinning, every cave stay one plant of seedling, it is ensured that retain 3500-5000 plants or so per acre, and make to intertill for the first time, cleared weeds；Work as plant
It is long to be higher than 1 meter or so, then intertill once, and earth up in plant root, it prevents from lodging, visual practical growing state intertills 2-3
Secondary, spring wants timely watering Irrigation when encountering damage caused by a drought；
And prune and prune, be when Grain Production of Amaranthus branch is more, for the good plant of growth and development, to prevent plant with
Based on prosperous growth, early stays fringe, stays fringe more；Weak strain should select the best florescence to stay fringe based on promoting to grow；When Grain Production of Amaranthus seedling grows to 9-10
When piece leaf, side shoot is destroyed in time, when growing to 5-6 inflorescence, side shoot is all destroyed, every plant is stayed 5-6 inflorescence；
And fertilizer and water management is then the timely watering Irrigation at dry season, when rainy season, drains flooded fields in time；Growth full period top dressing 2-3 times,
One mu of Grain Production of Amaranthus applies 5 kilograms of urea or 15 kilograms of ammonium bicarbonate every time, applies respectively in Seedling Stage and after buddingging, and preferred embodiment is to apply urine
5 kilograms of element；
In addition prevention and treatment pest and disease damage is that discovery has pest and disease damage such as chafer etc. after emergence, can with 2000-3000 times of Rogor,
DDVP medicine liquid spray；Occur if any root rot, answers ditching that ponding is discharged, be spread on root with the medicine soil that carbendazim mixes 3/1000ths
Portion；
It is to start to cradle utilization, the height for the stubble left 30 when 120-150 centimetres of plant height of plant that last Grain Production of Amaranthus, which cradles,
Centimetre, germinate continuous length, was cradled every 25 days once to obtain huge biomass, improve and remove cadmium amount, cradle altogether three times.
In addition to this, need to apply fertilizer to blade face in Grain Production of Amaranthus growth period, i.e., respectively in 60 centimetres of Grain Production of Amaranthus plant height and
At 100 centimetres, trace-element fertilizer is subjected to foliage spray fertilising, fertilizing standards 0.05%CuSO4Add 0.1%MnSO4Again plus
0.1%ZnSO4, foliage dressing be more advantageous to crop absorption, improve remove cadmium amount.
And the Grain Production of Amaranthus to harvest back, it needs to carry out stack retting landfill disposal, in phytoremediation trial zone adjacent position, builds
Multiple stack retting ponds are stood, can be established according to actual needs, the heavy metal accumulation plant of harvest back is placed in pond and carries out conventional stack retting,
High density polyethylene (HDPE) (HDPE) geomembrane is laid in pond in advance.
And in stack retting, 0.05g bacteria agent is added by 1kg Grain Production of Amaranthus (fresh weight), the stack retting time is 3-5 days, makes seed
Amaranth is quickly reduced；The residue being reduced through pile fermentation mixes after the flyash stabilizer for administering heavy metal pollution is added,
It is transferred to hawthorn or mining source region landfill, high density polyethylene (HDPE) (HDPE) geomembrane is laid with before filling and carries out antiseepage.
Grain Production of Amaranthus carries out concentrating stack retting and antiseepage landfill disposal, can be reduced the volume of Grain Production of Amaranthus cutting, and further
The solubility and migration for reducing the heavy metals such as cadmium, lead can evade because heavy metal ion shifts bring secondary hazards.
After plantation, the total amount of Grain Production of Amaranthus single plant cadmium metal accumulation is up to 9.73mg/kg, and cadmium contains in Grain Production of Amaranthus organ
Amount sequence is leaf > root > stem, and significant by time effects；With the extension of growth time, accumulate in the intracorporal cadmium metal of Grain Production of Amaranthus
Increase therewith, the cadmium metal increase especially accumulated in the leaf of Grain Production of Amaranthus is obvious, as shown in the table, before plantation Grain Production of Amaranthus
Afterwards in heavy metal pollution plot heavy metal element content balance table, it will be apparent that can find out, plantation Grain Production of Amaranthus can effectively absorb
Cadmium metal in soil.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (10)
1. a kind of plant restoration method of heavy-metal contaminated soil, which is characterized in that be disposed, plant to contaminated soil plot
Heavy metal super-enriched plant Grain Production of Amaranthus kind is planted, thinning is carried out according to emergence, is filled the gaps with seedlings, it is miscellaneous according to field in entire growth period
Grass and insect pest situation make field management, after Grain Production of Amaranthus growth, fertilizer are carried out foliage spray fertilising, harvests Grain Production of Amaranthus, carries out heap
It macerates, the residue that pile fermentation is reduced, transfer is filled, and is laid with geomembrane before filling and is carried out antiseepage, specifically includes following
Step:
S1. soil and seeds are chosen, and make smooth processing to soil；
S2. preceding pretreatment is sowed to seed and soil respectively, seed and soil is made to reach planting requirement；
S3. it sows；
S4. field management；
S5. it applies fertilizer in Grain Production of Amaranthus growth period to it, then harvests Grain Production of Amaranthus, carry out stack retting, and fill.
2. the plant restoration method of heavy-metal contaminated soil according to claim 1, which is characterized in that selected by the step S1
The seed taken is the Grain Production of Amaranthus seed of fighting drought, and selected soil is by middle low-concentration heavy metal contaminated soil plot, institute
State that make smooth processing to soil include plowing to soil, dry field 1-5 days, then hack makes agglomerate fragmentation, in the process, to soil
It applies calcium silicates and lime formula materials and routinely crop planting dosage applies base manure, stand 2-6 days, application contains micro member
The organic composite fertilizer of element, mixes organic composite fertilizer and soil uniformly.
3. the plant restoration method of heavy-metal contaminated soil according to claim 2, which is characterized in that described to soil application
Calcium silicates and lime formula materials soil application 100-300kg per acre, after 1-2 days per acre soil application 50-150kg calcium silicates and
Lime formula materials.
4. the plant restoration method of heavy-metal contaminated soil according to claim 1, which is characterized in that the step S2 is to kind
The pretreatment of son is sowing the last week to spread seed out to dry 1-4 days, and fine sand is uniformly mixed with Grain Production of Amaranthus seed；It is described to soil
The pretreatment of earth includes that field irrigates bottom water, and broadcasting external crucible soil will reach loose, fine crushing, smooth, pours bottom water, and bed soil is 5-15 lis
Rice, it is 5-10 centimetres that watering, which drenches, again sprinkled with the Nutrition Soil conducive to germination after sprinkling profoundly water；Then to field ridging, to field
For block from intermediate toward two sides piecemeal ridging, the width on each ridge is 1.5-2.5 meters, reserves 10-50 centimetres of height, 30- between each ridge
70 centimetres wide of farming sidewalk.
5. the plant restoration method of heavy-metal contaminated soil according to claim 1, which is characterized in that the step S3 sowing
The selection calm fine day that warms up is sowed with drill for sowing in lines, 3-10 centimetres of depth when sowing, 10-30 centimetres of spacing in the rows, and line-spacing 20-60
Centimetre, every cave 2-8 seeds, drill for sowing in lines earthing thickness wants uniformity, and it is stifled tight with wet mud at gap, it keeps having in bed higher
Temperature and humidity.
6. the plant restoration method of heavy-metal contaminated soil according to claim 1, which is characterized in that the field the S4 processing
Including with the next stage:
A1. thinning and intertillage: Grain Production of Amaranthus emergence after, look into seedling in time, fill the gaps with seedlings, when seedling grow tall 5-15 centimetres when start thinning, often
Stay one plant of seedling in cave, it is ensured that retain 2000-6000 plants or so per acre, and make to intertill for the first time, cleared weeds；When plant length is higher than
0.8-1.2 meters, then intertill once, and earth up in plant root, it prevents from lodging, be intertilled 1-3 times depending on growing state, spring encounters drought
Timely watering Irrigation is wanted when feelings；
A2. training is pruned: Grain Production of Amaranthus branch is more, the good plant of growth and development, based on prosperous growth, early stays fringe, stays fringe more；It is weak
Strain should select the best florescence to stay fringe based on promoting to grow；When Grain Production of Amaranthus seedling grows to 6-12 piece leaf, side shoot is destroyed, grows to 4-8
When inflorescence, side shoot is all destroyed, every plant is stayed 4-8 inflorescence；
A3. fertilizer and water management: timely watering Irrigation when dry season, when rainy season, drain flooded fields in time；Growth full period top dressing 1-4 times, one mu of seed
Amaranth applies 2-6 kilograms of urea or 10-20 kilograms of ammonium bicarbonate every time, applies respectively in Seedling Stage and after buddingging；
A4. prevent and treat pest and disease damage: discovery has pest and disease damage after emergence, sprays insecticide；There is disease, then processing in time；
A5. Grain Production of Amaranthus cradles: starting to cradle utilization when 80-180 centimetres of plant height, the height for the stubble left is 20-40 centimetres, and germinating is continuous
It is long, it was cradled every 15-35 days once to obtain huge biomass, improves and remove cadmium amount.
7. the plant restoration method of heavy-metal contaminated soil according to claim 1, which is characterized in that the S5 is to Grain Production of Amaranthus
It applies fertilizer, carries out foliage dressing in Grain Production of Amaranthus growth period, respectively at 40-90 centimetres, 100-130 centimetres of Grain Production of Amaranthus plant height,
Fertilizer is subjected to foliage spray.
8. the plant restoration method of heavy-metal contaminated soil according to claim 7, which is characterized in that the fertilizer is micro
Element fertilizer, fertilizing standards 0.03-0.08%CuSO4And 0.05-0.15%MnSO4And 0.05-0.15%ZnSO4Mixture.
9. the plant restoration method of heavy-metal contaminated soil according to claim 1, which is characterized in that the S5 harvest is returned
Grain Production of Amaranthus need to carry out stack retting landfill disposal, in phytoremediation trial zone adjacent position, establish at least one stack retting pond, will harvest
Heavy metal accumulation plant back, which is placed in pond, carries out conventional stack retting, is laid with geomembrane in pond.
10. the plant restoration method of heavy-metal contaminated soil according to claim 9, which is characterized in that the seed of the harvest
0.03-0.08g bacteria agent is added in stack retting, by 0.8-1.2kg Grain Production of Amaranthus in grain amaranth, and the stack retting time is 2-6 days, makes Grain Production of Amaranthus
Quickly decrement, the residue that will be reduced through pile fermentation mix after the flyash stabilizer for administering heavy metal pollution is added
Stirring is transferred to hawthorn or mining source region landfill, is laid with geomembrane before filling and carries out antiseepage.
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| CN201810700962.6A CN108971210A (en) | 2018-06-29 | 2018-06-29 | A kind of plant restoration method of heavy-metal contaminated soil |
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| CN201810700962.6A Pending CN108971210A (en) | 2018-06-29 | 2018-06-29 | A kind of plant restoration method of heavy-metal contaminated soil |
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