CN103894401B - A kind of plant restoration method administering the plumbous arsenic combined contamination soil of cadmium - Google Patents
A kind of plant restoration method administering the plumbous arsenic combined contamination soil of cadmium Download PDFInfo
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Abstract
The invention provides a kind of plant restoration method administering the plumbous arsenic combined contamination soil of cadmium, it is as follows that the method comprising the steps of: step S1: choose cadmium concentration type castor-oil plant kind; Step S2: the plumbous arsenic contaminated soil of cadmium obtaining neutral pH; Step S3: cadmium concentration type castor-oil plant and ciliate desert-grass are planted survival and growth in the plumbous arsenic contaminated soil of cadmium of neutral pH with intercropping system, and the castor-oil plant that regularly results are ripe, perform step S5; Step S4: the growing height looking ciliate desert-grass, harvesting ciliate desert-grass top, performs step S5; Soil ground retains a ciliate desert-grass section stubble and performs step S3; Step S5: the castor-oil plant ripe by results and ciliate desert-grass top are delivered to exclusive place and concentrated and do harmless treatment.The present invention also provides a kind of plant restoration method administering cadmium pollution soil.The present invention is applicable to the improvement reparation of moderate and the plumbous As polluted soil of slight cadmium, has good actual application prospect.
Description
Technical field
The present invention relates to pollutant abatement technology field, specifically a kind of plant restoration method administering the plumbous arsenic combined contamination soil of cadmium.
Background technology
At present along with the quickening of industrial and agricultural development and urbanization process, the phenomenon of heavy-metal contaminated soil is commonplace in China some areas, some non-ferrous metal mining area and surrounding area, smeltery particularly serious, wherein cadmium (Cd), plumbous (Pb), arsenic (As) are particularly serious, for ensureing the soil phosphorus forms of agriculture and forestry production and plant normal growth in GB15618-1995 " standard of soil environment quality ".Present China is by the agricultural land soil about 2,500 ten thousand hectares of heavy metal pollution, and grain contaminated by heavy metals every year reaches 1,200 ten thousand tons, and the direct economic loss caused is more than 10,000,000,000 yuan.
In recent years, phytoremediation technology becomes main flow gradually in international and domestic improvement heavy metal pollution of soil field.Phytoremediation advantage mainly contains: be suitable for pollution factor extensive, is not only applicable to heavy metal, simultaneously doublely controls organic contamination; From ecological view, be conducive to impurely restoration of the ecosystem, beautify the environment; Take solar energy as power, less investment, cost is low; Not easily cause secondary pollution.
In phytoremediation technology, selecting heavy metal super-enriched plant technology to carry out restoration of soil polluted by heavy metal is comparatively common a kind of technology.This technology remediation efficiency depends primarily on content and the phytomass of plant heavy metal of body.For plants enriched desirable super enriching plant, the tenor of its overground part than common plant high hundred times even thousands of times, should should have the higher speed of growth and larger biomass simultaneously.But regrettably, the biomass of the most of super enriching plant found at present is general less, thus limit its application in contaminated soil remediation.Adopt this technology longer for repair time simultaneously, also limit the popularization of this technology to a certain extent.
At present, select energy-source plant in restoration of soil polluted by heavy metal, have unique advantage, not only while improvement soil pollution, source benefit can be obtained.Research shows, some energy-source plants have higher enrichment or the ability of heavy metal tolerance, can grow on heavy-metal contaminated soil, and energy substance output is substantially unaffected simultaneously.Therefore choose applicable energy-source plant and carry out restoration of soil polluted by heavy metal, be not only conducive to heavy-metal contaminated soil and administer, and the exploitation of new forms of energy can be advanced, make contaminated land resource obtain Appropriate application simultaneously.But it is long that the pollution of energy-source plant repairing heavy metal in soil also exists growth cycle, and repair time is of a specified duration, post processing difficulty, the plants such as long-term plantation reduction soil fertility have shortcoming.Meanwhile, compared with hyperaccumulative plant, the ability of many energy-source plant enriching heavy metals is also lower.
Summary of the invention
(1) technical problem that will solve
For the deficiency of two Plants recovery techniques in prior art, the object of the invention is to propose to utilize castor-oil plant and ciliate desert-grass interplanting technique to repair the plant restoration method of the plumbous arsenic combined contamination soil of cadmium.
(2) technical scheme
A first aspect of the present invention is to provide a kind of plant restoration method administering the plumbous arsenic combined contamination soil of cadmium, and it is as follows that the method comprising the steps of:
Step S1: choose cadmium concentration type castor-oil plant kind;
Step S2: the acid-base value controlling the plumbous As polluted soil of cadmium, obtains the plumbous arsenic contaminated soil of cadmium of neutral pH;
Step S3: cadmium concentration type castor-oil plant and ciliate desert-grass are planted survival and growth in the plumbous arsenic contaminated soil of cadmium of neutral pH with intercropping system, is absorbed the cadmium in contaminated soil by the root system of castor-oil plant in a large number, and the castor-oil plant that regularly results are ripe, then perform step S5;
Step S4: the growing height looking ciliate desert-grass, harvesting ciliate desert-grass top, absorbs the plumbous arsenic in contaminated soil in a large number by the grass roots system of ciliate desert-grass and the ciliate desert-grass top of harvesting, then perform step S5; Described soil ground retains a ciliate desert-grass section stubble, then performs step S3;
Step S5: the castor-oil plant ripe by results and ciliate desert-grass top are delivered to exclusive place and concentrated and do harmless treatment.
A second aspect of the present invention is to provide a kind of plant restoration method administering cadmium pollution soil, and it is as follows that the method comprising the steps of:
Steps A 1: choose cadmium concentration type castor-oil plant kind;
Steps A 2: the acid-base value controlling cadmium pollution soil, obtains the cadmium pollution soil of neutral pH;
Steps A 3: by survival and growth in cadmium concentration type cultivating castor-oil plant to the cadmium pollution soil of neutral pH, the castor-oil plant that regularly results are ripe, is removed the cadmium in cadmium pollution soil by cadmium concentration type castor-oil plant;
Steps A 4: the castor-oil plant that results are ripe is delivered to exclusive place and concentrates and do harmless treatment.
(3) beneficial effect
The present invention utilizes energy-source plant castor-oil plant to have certain cadmium ion energy, repairs deep soil, can establishing in large scale, beautify the environment and produce the feature of source benefit, and cadmium plumbous arsenic enriching plant ciliate desert-grass, have the advantages that the plumbous arsenic ion ability of enrichment arsenic is strong, cultivation technique is ripe, the plumbous arsenic combined contamination soil of both combine d bioremediation cadmiums, higher remediation efficiency can be reached, and obtain source benefit.Provided by the invention in the plumbous As polluted soil of cadmium intercropping castor-oil plant and ciliate desert-grass, utilize castor-oil plant biomass larger, growth period shorter the and cadmium that the enriched character of cadmium absorbed in a large number in Enriching soil, utilize ciliate desert-grass growth period shorter and absorb plumbous arsenic in Enriching soil in a large number to the super enriched character of plumbous arsenic and to be eliminated the method that the plumbous arsenic of cadmium in soil pollutes by harvesting overground part simultaneously, there is the physicochemical property of not spoiled soil, not high to the absorption enriching quantity of soil generation secondary pollution and the plumbous arsenic of cadmium, bio-concentration factor is large and cadmium plumbous arsenic migration total amount is high, and there is higher economic benefit simultaneously, construction investment is few, operating cost is low, prevention soil and water loss, beautify the features such as landscape environment, be applicable to the improvement reparation of moderate and the plumbous As polluted soil of slight cadmium, its environmental benefit, Social benefit and economic benefit is obvious.
Accompanying drawing explanation
Fig. 1 illustrates the flow chart of the plant restoration method administering the plumbous arsenic combined contamination soil of cadmium;
Fig. 2 illustrates the flow chart of the plant restoration method administering cadmium pollution soil;
Fig. 3 illustrates the castor-oil plant indoor pot experiment of 30 kinds of different cultivars of different regions;
Fig. 4 illustrates and goes out cadmium concentration type castor-oil plant kind to Fig. 1 castor-oil plant Preliminary screening;
Fig. 5 transplants ciliate desert-grass seedling and castor-oil plant intercropping schematic diagram.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
One. first, introduce the ciliate desert-grass in the present invention:
Ciliate desert-grass is the super enriching plant that Chen Tongbin research team finds As the earliest in the world.Ciliate desert-grass not only shows as extremely strong patience ability and unique accumulation ability to As, and has stronger patience effect and enrichment to Pb.Field investigation shows, and it is that the slag of 23400mg/kg and lead concentration are up in the contaminated soil near the Pb-Zn tailings of 3368-3550mg/kg that ciliate desert-grass can grow at As content.Ciliate desert-grass has stronger arsenic patience, arsenic accumulation ability and arsenic absorption rate fast, and in the soil of arsenic content < 1000mg/kg, the bio-concentration factor ratio of (in plant certain content of beary metal and this content of beary metal in its root region soil) can reach 7-80.Ciliate desert-grass at Pb content be the land reclamation in mining area of 4325-13254mg/kg when growing, the Pb content of ciliate desert-grass overground part has exceeded the requirement (1000mg/kg) of Pb super enriching plant, ciliate desert-grass overground part Pb content is 1.4 times of underground part Pb content simultaneously, illustrate that ciliate desert-grass has stronger accumulation ability and turn-over capacity (representing to transport coefficient, i.e. the ratio of plant shoot content of beary metal and this content of beary metal in its root) to Pb.Ciliate desert-grass overground part not only can the arsenic of enriched plumbous, and fast growth, biomass is large.But also there are some limiting factors in its popularization aspect: ciliate desert-grass growth needs shades, the growth conditions that moisturizing etc. are more harsh; Indifferent to Cd uptake; Ciliate desert-grass root system is shallow not good to plough horizon bottom repairing effect; Directly can not bring economic interests etc.
Two. then, introduce the castor-oil plant in the present invention:
Castor-oil plant is " deep rooted plant ", belongs to annual or herbaceos perennial, is the oil crops that a kind of economic worth is higher, not high to environmental requirement, can survive the winter in south, and biomass is large, and heavy metal has stronger patience.Have research display, castor-oil plant also has higher patience and accumulation ability to cadmium.Show after deliberation, for castor-oil plant, the cadmium of low concentration exposes and does not only suppress it to grow, and also produces certain promotion to castor-oil plant growth.Castor-oil plant is when Cadmium in Soil concentration for the treatment of is 40mg/kg, and the dry matter of the plant height of castor-oil plant and root, stem, leaf reaches maximum.The Cd of castor-oil plant energy enrichment higher concentration when soil Cd concentration is higher.Castor root ties up to when Cadmium in Soil concentration for the treatment of is 360mg/kg maximum, reaches 4460mg/kg, and overground part leaf and stem reach maximum when Cadmium treated concentration 320mg/kg and 360mg/kg respectively to Cadmium accumulation, and wherein the maximum accumulation of stem to cadmium reaches 137mg/kg.Therefore, castor-oil plant can be used for the improvement reparation of severe and slight cadmium pollution soil; Except to except the absorption enriching quantity of cadmium and bio-concentration factor and transfer ratio, biomass is also the important indicator evaluating phytoremediation cadmium pollution soil potential ability.Biomass is larger, illustrate within identical growth period with under identical concentration coefficient condition, the amount that this plant absorbs the cadmium of enrichment from soil is more, show under identical planting conditions, this plant makes cadmium pollution soil be reduced to GB15618-1995 " standard of soil environment quality " and specifies that below critical value time used is shorter.The biomass of castor-oil plant is comparatively large, and its biomass is about 500 ~ 700g/ strain (dry weight).Castor-oil plant is significant for the reparation speed and reduction treatment cost improving cadmium pollution soil, for the cadmium pollution of administering soil provides a kind of economic and practical plant restoration method.But utilize separately at present and during castor-oil plant repairing polluted soil, also to have that it is not as high in accumulation abilities such as plumbous arsenic to other heavy metals, the shortcomings such as repair time is longer.
In sum, in view of ciliate desert-grass feature and growth conditions, and castor-oil plant and ciliate desert-grass pluses and minuses when repairing separately, the present invention utilizes the advantage of ciliate desert-grass overground part, utilize the advantage of castor-oil plant, the growth for ciliate desert-grass provides required growth conditions, adopts castor-oil plant-ciliate desert-grass united mode restoration of soil polluted by heavy metal, can advantage be highlighted, supplement each other.First, castor-oil plant has absorption selectivity from ciliate desert-grass to heavy metal different in soil, and both associatings can realize having complementary advantages, to process soil heavy metal combined pollution problem, in order to the plumbous arsenic of the cadmium in decreasing pollution soil.Secondly, ciliate desert-grass repairs thin solum, and castor-oil plant can the deep layer region of restoration of soil polluted by heavy metal, realizes interval complementary.3rd, castor-oil plant can be ciliate desert-grass and shades moisturizing to meet the required environment of ciliate desert-grass growth.
The flow chart of the plant restoration method of the plumbous arsenic combined contamination soil of improvement cadmium provided by the invention is shown as Fig. 1, the present invention by energy crop castor-oil plant by planting in the plumbous arsenic contaminated soil of cadmium with the mode of ciliate desert-grass intercropping, it is neutral for controlling soil acidity or alkalinity, when castor-oil plant grows to the maturity period, plant is removed from contaminated soil, thus realizes the object removing the plumbous arsenic of pollutant in soil cadmium; The plumbous arsenic of cadmium that the method is absorbed in contaminated soil in a large number by castor-oil plant and ciliate desert-grass root system, and transfer them to the overground part organs such as cauline leaf, the maturity period namely castor-oil plant entirety is comprised root, stem, leaf, fruit parts and ciliate desert-grass aerial part comprise stem and leatherleaf is removed from contaminated soil, and then transplant next batch of castor-oil plant, repeat said process afterwards.
Administer the flow chart of the plant restoration method of cadmium pollution soil as shown in Figure 2, it is as follows that the method comprising the steps of: steps A 1: choose cadmium concentration type castor-oil plant kind; Steps A 2: the acid-base value controlling cadmium pollution soil, obtains the cadmium pollution soil of neutral pH; Steps A 3: by survival and growth in cadmium concentration type cultivating castor-oil plant to the cadmium pollution soil of neutral pH, the castor-oil plant that regularly results are ripe, is removed the cadmium in cadmium pollution soil by cadmium concentration type castor-oil plant; Steps A 4: the castor-oil plant that results are ripe is delivered to exclusive place and concentrates and do harmless treatment.When described cadmium pollution soil is basic soil, to basic soil mugineic acid material, in order to regulate the acid-base value of basic soil.Described acidic materials comprise one or more in b diammonium disodium edta salt, oxalic acid, citric acid.
Be subject to, in the plumbous arsenic contaminated soil of cadmium, directly sowing cadmium concentration type castor-oil plant kind, transplanting ciliate desert-grass intercropping simultaneously.Utilize castor-oil plant to the enriched character of cadmium and ciliate desert-grass to the enriched character of plumbous arsenic, the plumbous arsenic of the cadmium absorbed in a large number in Enriching soil by root system, and it is upwards carried and transfers to overground part, the plumbous arsenic of cadmium in soil is removed again by harvesting overground part, thus the improvement completed the plumbous As polluted soil of cadmium and reparation.
The present invention is completed by following steps, first compares the cadmium accumulation ability of 30 kinds of castor-oil plant kinds, and the cadmium concentration type kind therefrom choosing establishing in large scale is used as repair materials.Secondly cadmium concentration type kind is planted by the plumbous arsenic contaminated soil of cadmium by the mode of directly sowing, and control soil acidity or alkalinity pH for neutral, when facts have proved that the pH value controlling soil is 6.1 ~ 7.1, cadmium amount in its Root Absorption Enriching soil is maximum, and the soil for meta-alkalescence wants mugineic acid material to be regulated.The acidic materials used comprise b diammonium disodium edta salt (EDTA), one or more in oxalic acid, citric acid; After cultivating castor-oil plant survives, when aerial part height is 60cm-100cm, transplant and highly carry out intercropping for 15cm-30cm ciliate desert-grass seedling and castor-oil plant, according to the spacing in the rows plantation nonoculture castor-oil plant of 0.5m ~ 1m, according to spacing in the rows intercropping castor-oil plant and the ciliate desert-grass (as Fig. 5 illustrates) of 0.2m ~ 0.5m; Water according to soil lack of water situation, make soil moisture content remain on 40 ~ 70% of field capacity; Gather in first when ciliate desert-grass grows into 60cm ~ 80cm, gather in once when ciliate desert-grass grows into 50cm ~ 70cm later; After each harvesting ciliate desert-grass aerial part, the height for the stubble left is 10cm ~ 20cm; After castor-oil plant maturation, fruit biodiesel, stem stalk is used for papermaking or building materials; The ciliate desert-grass overground part of each harvesting focuses on specially, and processing method comprises burns or makes innoxious landfill etc. after compression.
The invention will be further described by the following examples.
(1) cadmium concentration type castor-oil plant screening varieties:
Indoor pot experiment is carried out, to screen cadmium concentration type castor-oil plant kind (Fig. 3) to the castor-oil plant of 30 kinds of different cultivars from America, Europe, Asia and African different regions.Be castor-oil plant growth substrate with low (2mg/kg) and moderate (5mg/kg) cadmium pollution soil, record and analyze castor-oil plant aerial part (stem, leaf and fruit) biomass and cadmium concentration.Consider the Cd content of the biomass of these 30 kinds of castor-oil plant kind aerial parts, cadmium content and corresponding soil thereof, Preliminary screening goes out cadmium concentration type castor-oil plant kind 4 kinds: Zibo-9, Zibo-6, Zibo-5 and Zibo-8 (Fig. 4), and according to the response of castor-oil plant biomass under low and moderate cadmium pollution soil condition as patience evaluation index, draw the cadmium patience of these four kinds of cadmium enrichment castor-oil plant kinds sequentially: Zibo-9 > Zibo-6 > Zibo-8 > Zibo-5.
(2) cadmium concentration type castor-oil plant repairs pattern:
Certain heavy-metal contaminated soil pH value is 7.4, by adding b diammonium disodium edta salt, its pH is adjusted to 6.1-7.1.Cadmium content mean value is wherein 34mg/kg.The cadmium enrichment castor-oil plant kind Zibo-8 and Zibo-5 choosing establishing in large scale is repair materials, and be planted in Polluted Soil in the mode of pot experiment, soil moisture content remains on 40 ~ 70% of field capacity.Grow after 2 months, Zibo-5 kind can not be survived, Zibo-8 kind energy normal growth.Root and the aerial part (cauline leaf) of getting Zibo-8 kind carry out the analysis of mensuration cadmium content, grow adjustment soil pH after the root of Zibo-8 kind and the cadmium content of aerial part be respectively 216mg/kg and 8.84mg/kg, be significantly higher than growth at the cadmium content not adjusting the castor-oil plant underground and aboveground of the same race on pH soil, i.e. 205mg/kg and 1.84mg/kg.Therefore, Zibo-8 kind is not only applicable to slight cadmium pollution soil and repairs, and is also applicable to heavy Cd contamination soil and repairs, and regulates the measure of soil pH can improve its extraction effect to cadmium further by adding acidic materials simultaneously.
(3) field castor-oil plant-ciliate desert-grass intercropping configuration mode
Certain heavy-metal contaminated soil pH value is 7.7, by adding b diammonium disodium edta salt, its pH is adjusted to 6.1-7.1.Cadmium content mean value is wherein 3.53mg/kg, and lead content mean value is wherein 274mg/kg, and arsenic content mean value is wherein 24mg/kg.The cadmium enrichment castor-oil plant kind Zibo-8 choosing establishing in large scale is repair materials, after concentration type cultivating castor-oil plant survives, when aerial part height is 60-100cm, transplant and highly carry out intercropping (Fig. 3) for 15-30cm ciliate desert-grass seedling and castor-oil plant, according to the spacing in the rows plantation nonoculture castor-oil plant of 0.5 ~ 1m, according to spacing in the rows intercropping castor-oil plant and the ciliate desert-grass of 0.25 ~ 0.5m; Soil moisture content remains on 40 ~ 70% of field capacity.Grow after 4 months, gather in its overground part of castor-oil plant first, ciliate desert-grass gathers in 2 times during this period, and harvested material send waste guaveyard security landfill.Measure by analysis, cadmium in ciliate desert-grass overground part, plumbous and arsenic content is respectively 4.1mg/kg, 83mg/kg and 324mg/kg, the cadmium of castor-oil plant stem, plumbous and arsenic content is respectively 3.17mg/kg, 14.59mg/kg and 2.47mg/kg, the cadmium of castor leaf, plumbous and arsenic content is respectively 20.31mg/kg, 38.46mg/kg and 26.14mg/kg, according to every mu of heavy 300kg and leaf dry weight 300kg of castor-oil plant stem under Intercropping, ciliate desert-grass aerial part dry weight is that 100kg calculates, annual castor-oil plant gathers in the crops 2 times, ciliate desert-grass gathers in the crops 3 times, take intercropping mode every mu can take away 15g cadmium from soil every year, 57g lead and 114g arsenic, effectively can take away the heavy metal contaminants in soil, obtain the effect of administering soil pollution.Output castor bean 400 ~ 500kg, produces about biodiesel 150kg simultaneously.
The above; be only the detailed description of the invention in the present invention, but protection scope of the present invention is not limited thereto, any people being familiar with this technology is in the technical scope disclosed by the present invention; the conversion or replacement expected can be understood, all should be encompassed in of the present invention comprising within scope.
Claims (9)
1. administer a plant restoration method for the plumbous arsenic combined contamination soil of cadmium, it is characterized in that, it is as follows that the method comprising the steps of:
Step S1: choose cadmium concentration type castor-oil plant kind;
Step S2: the acid-base value controlling the plumbous As polluted soil of cadmium, obtains the plumbous arsenic contaminated soil of cadmium of neutral pH;
Step S3: cadmium concentration type castor-oil plant and ciliate desert-grass are planted survival and growth in the plumbous arsenic contaminated soil of cadmium of neutral pH with intercropping system, is absorbed the cadmium in contaminated soil by the root system of castor-oil plant in a large number, and the castor-oil plant that regularly results are ripe, then perform step S5;
Step S4: the growing height looking ciliate desert-grass, harvesting ciliate desert-grass top, absorbs the plumbous arsenic in contaminated soil in a large number by the grass roots system of ciliate desert-grass and the ciliate desert-grass top of harvesting, then perform step S5; Described soil ground retains a ciliate desert-grass section stubble, then performs step S3;
Step S5: the castor-oil plant ripe by results and ciliate desert-grass top are delivered to exclusive place and concentrated and do harmless treatment;
The described step choosing cadmium concentration type castor-oil plant kind comprises:
With low and moderate cadmium pollution soil for castor-oil plant growth substrate, record and analyze castor-oil plant Aboveground Biomass of Young and cadmium concentration;
Consider the cadmium content of the biomass of the multiple castor-oil plant kind aerial part of different regions, cadmium content and corresponding soil thereof, filter out cadmium concentration type castor-oil plant kind: Zibo-9, Zibo-6, Zibo-5 and Zibo-8;
According to the response of castor-oil plant biomass under low and moderate cadmium pollution soil condition as patience evaluation index, obtain the cadmium patience of cadmium enrichment castor-oil plant kind sequentially: Zibo-9 > Zibo-6 > Zibo-8 > Zibo-5.
2. the plant restoration method administering the plumbous arsenic combined contamination soil of cadmium as claimed in claim 1, it is characterized in that, described cadmium concentration type castor-oil plant and ciliate desert-grass intercropping system plant intercropping according to the spacing in the rows of 0.25m ~ 0.5m.
3. the plant restoration method administering the plumbous arsenic combined contamination soil of cadmium as claimed in claim 2, it is characterized in that, when the plumbous As polluted soil of described cadmium is basic soil, to basic soil mugineic acid material, be 6.1 ~ 7.1 in order to regulate the pH value of basic soil; Described acidic materials comprise one or more in b diammonium disodium edta salt, oxalic acid, citric acid.
4. the plant restoration method administering the plumbous arsenic combined contamination soil of cadmium as claimed in claim 1, it is characterized in that, the growing height of described ciliate desert-grass gathers in first when ciliate desert-grass grows into 60cm ~ 80cm, gathers in once afterwards when ciliate desert-grass grows into 50cm ~ 70cm again.
5. the plant restoration method administering the plumbous arsenic combined contamination soil of cadmium as claimed in claim 1, it is characterized in that, the height of described ciliate desert-grass section stubble is 10cm ~ 20cm.
6. the plant restoration method administering the plumbous arsenic combined contamination soil of cadmium as claimed in claim 1, is characterized in that, described harmless treatment comprises burns or makes innoxious landfill after compression.
7. administer a plant restoration method for cadmium pollution soil, it is characterized in that, it is as follows that the method comprising the steps of:
Steps A 1: choose cadmium concentration type castor-oil plant kind;
Steps A 2: the acid-base value controlling cadmium pollution soil, obtains the cadmium pollution soil of neutral pH;
Steps A 3: by survival and growth in cadmium concentration type cultivating castor-oil plant to the cadmium pollution soil of neutral pH, the castor-oil plant that regularly results are ripe, is removed the cadmium in cadmium pollution soil by cadmium concentration type castor-oil plant;
Steps A 4: the castor-oil plant that results are ripe is delivered to exclusive place and concentrates and do harmless treatment;
The described step choosing cadmium concentration type castor-oil plant kind comprises:
With low and moderate cadmium pollution soil for castor-oil plant growth substrate, record and analyze castor-oil plant Aboveground Biomass of Young and cadmium concentration;
Consider the cadmium content of different regions, the biomass of multiple castor-oil plant kind aerial part of different cultivars, cadmium content and corresponding soil thereof, Preliminary screening goes out cadmium concentration type castor-oil plant kind: Zibo-9, Zibo-6, Zibo-5 and Zibo-8;
According to the response of castor-oil plant biomass under low and moderate cadmium pollution soil condition as patience evaluation index, draw the cadmium patience of cadmium enrichment castor-oil plant kind sequentially: Zibo-9 > Zibo-6 > Zibo-8 > Zibo-5.
8. the plant restoration method administering cadmium pollution soil as claimed in claim 7, it is characterized in that, when described cadmium pollution soil is basic soil, to basic soil mugineic acid material, be 6.1 ~ 7.1 in order to regulate the pH value of basic soil.
9. the plant restoration method administering cadmium pollution soil as claimed in claim 8, it is characterized in that, described acidic materials comprise one or more in b diammonium disodium edta salt, oxalic acid, citric acid.
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