CN109902929A - A method of dividing pollution of heavy metals in rice producing region - Google Patents
A method of dividing pollution of heavy metals in rice producing region Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of method for dividing pollution of heavy metals in rice producing region, comprising: the heavy metal accumulation coefficient of collection different cultivars rice grain and corresponding soil physico-chemical property data；Correction is normalized to the heavy metal accumulation coefficient of different rice varieties；The cumulative probability distribution reciprocal of different rice varieties heavy metal accumulation coefficients after normalization is fitted, species sensibility distribution curve is obtained；Based on rice varieties ratio to be protected; binding species sensibility distribution curve; obtain the inverse of heavy metal accumulation coefficient corresponding with rice varieties ratio to be protected; and then obtain the heavy metal secure threshold of soil; pollution of heavy metals in rice producing region is divided with this; it is a kind of more scientific classification standard, realizes the farming land based on agricultural product quality and safety and divide.
Description
Technical field
Agricultural environment of embodiment of the present invention technical field more particularly to a kind of side for dividing pollution of heavy metals in rice producing region
Method.
Background technique
National Soil Pollution Investigation shows that China's arable soil environmental quality causes anxiety within 2014, and point exceeding standard rate reaches
19.40%, major pollutants are the heavy metals such as cadmium, nickel, copper, arsenic, mercury, lead." itai-itai " of Japan is since people drink
Caused by the water of cadmium (Cd) pollution.Lead (Pb) can cause the reproductive function of various biologies including humans to decline, machine
Body immunity reduces, and causes a series of symptoms such as dizziness, headache, failure of memory and abdomen pain.Chromium (Cr) be a kind of toxicity compared with
Big heavy metal, is easily accessible human body cell, causes to damage to the internal organs such as liver, kidney and DNA, and accumulation, which has, in human body causes
It is carcinous and may induce gene mutation.Organism usually can be such that heavy metal gradually accumulates in soil environment with enriching heavy metal,
Even certain heavy metal elements can also be converted into the bigger methyl compound of toxicity in the soil, also by food chain with
Adverse concentration is accumulated in human body, seriously endangers human health.Rice has stronger absorption to heavy metal, and rice is that China is main
Cereal crops, due to being seriously threatened by heavy metal pollution, the situation very severe of pollution prevention.
Based on this, State Council has formally put into effect Soil Pollution Control action plan (referred to as " ten, soil ") in May, 2016,
Specific requirement is proposed to the main contents and task of the work of China's Soil Pollution Control from now on.Wherein, for farming land soil
It is required that implementing Classification Management, farming land is divided into three classifications by pollution level, i.e. priority protection class, safe utilization class and stringent
Class is managed, and takes corresponding management measure respectively, to ensure agricultural product quality and safety.
Currently, the correlative study majority about Classification of Agricultural Land is to carry out category division to farming land by pollution level, so
And when encountering the situation that soil is not exceeded but agricultural product are exceeded, just seem not rigorous enough by soil contamination grade division.Therefore
Consider that agricultural product factor divides field in farming land and is just particularly important.Rice absorbing heavy metal-polluted soil is not only contaminated next
Source, soil labile organic matter and environmental condition etc. influence, and different rice types, the heavy metal accumulation of even different genotype rice are special
Sign has notable difference.Species sensitivity distribution (SSD) curve method can in the complicated ecosystem, by probability or
Person's empirical distribution function describes different plant species sample to the sensitivity difference of Stress Factors.It can be also used for environmental quality mark
Quasi- formulation is used to determine the pollutant concentration that can protect most of species in the ecosystem.But currently, will not also
Species sensitivity distribution (SSD) curve is applied to the division of farming land.
Summary of the invention
In view of the problems of the existing technology, the embodiment of the present invention provides a kind of side for dividing pollution of heavy metals in rice producing region
Method realizes the farming land based on agricultural product quality and safety and divides.
The embodiment of the present invention provides a kind of method for dividing pollution of heavy metals in rice producing region, comprising:
The heavy metal accumulation coefficient of collection different cultivars rice grain and corresponding soil physico-chemical property data；
The heavy metal accumulation coefficient of collection is screened；
The heavy metal accumulation coefficient after screening is handled, the heavy metal accumulation system of different rice varieties is obtained
Number；
Correction is normalized to the heavy metal accumulation coefficient of the different rice varieties, the different water after being normalized
The heavy metal accumulation coefficient of rice varieties；
The cumulative probability distribution reciprocal of different rice varieties heavy metal accumulation coefficients after the normalization is intended
It closes, obtains species sensibility distribution curve；
The ratio of rice varieties to be protected in heavy metal pollution producing region is set；
Based on the rice varieties ratio to be protected, in conjunction with the species sensibility distribution curve, acquisition is wanted with described
The inverse of the corresponding heavy metal accumulation coefficient of the rice varieties ratio of protection；
Based on the inverse of the heavy metal accumulation coefficient, the heavy metal secure threshold of soil is obtained；
Heavy metal secure threshold based on the soil divides the pollution of heavy metals in rice producing region.
Further, the heavy metal accumulation coefficient and corresponding soil physico-chemical property number for collecting different cultivars rice grain
According to, comprising:
Collect the content of beary metal or rice in the related China typical case agricultural land soil delivered and corresponding rice grain
The heavy metal accumulation coefficient of seed, and corresponding soil physico-chemical property data；
Spot sampling obtains rice grain and cooperates with sample with soil, is analyzed the heavy metal accumulation coefficient for obtaining rice grain
And soil physico-chemical property data.
Further, the heavy metal accumulation coefficient of described pair of collection screens, including to the heavy metal delivered
Concentration coefficient is screened, wherein screening conditions include:
Test does not include water culture experiment using natural soils as medium；
Experiment process and data processing standardization, while there is the content of beary metal in soil and collaboration acquisition rice grain
Data, the heavy metal accumulation coefficient refer to the ratio of corresponding content of beary metal in content of beary metal and soil in rice grain
Value；
The heavy metal accumulation coefficient should indicate corresponding rice varieties.
Further, the heavy metal accumulation coefficient after described pair of screening is handled, and obtains the weight of different rice varieties
Metal enrichment coefficient, comprising: if same rice varieties have multiple heavy metal accumulation coefficients after screening, examine the heavy metal rich
Collect coefficient and reject wherein abnormal heavy metal accumulation coefficient, to remaining heavy metal accumulation coefficient computational geometry average value conduct
The heavy metal accumulation coefficient of the rice varieties.
Further, the normalization includes normalizing to the heavy metal accumulation coefficient of the different rice varieties
Under specific edaphic condition, while kind of an interior mutation is carried out, to eliminate soil physico-chemical property difference to the heavy metal accumulation of rice varieties
The influence of coefficient, wherein normalize the model of use are as follows:
Lg (BCF)=a × pH+b × lg (SOC)+k
Wherein, BCF is heavy metal accumulation coefficient, and pH is the pH value of soil, and SOC is the organic carbon content of soil, and a, b are nothing
Dimensional parameters indicate soil property to the influence degree of heavy metal accumulation coefficient, and k is the intercept of equation, indicates rice varieties pair
The intrinsic sensibility of Accumulation of heavy metals.
Further, the ratio of rice varieties to be protected is 5% and 95% in the setting heavy metal pollution producing region.
Further, heavy metal accumulation coefficient corresponding with the rice varieties ratio to be protected is obtained by following formula
Inverse,
Wherein, q is 5% or 95%, a, b, x0For dimensionless group, indicate soil property to the shadow of heavy metal accumulation coefficient
The degree of sound, HC (q) indicate to protect the inverse of the heavy metal accumulation coefficient of 5% or 95% rice varieties quality safety.
Further, the heavy metal secure threshold of the soil is obtained by following formula,
CS=CR×HC(q)
Wherein, CSIndicate the heavy metal secure threshold of soil, HC (q) expression will protect 5% or 95% rice varieties quality
The inverse of the heavy metal accumulation coefficient of safety, CRIndicate the heavy metal safety limit in rice food safety quality standard.
Further, the heavy metal secure threshold of the soil is obtained by following formula,
Wherein, CS indicates that the heavy metal secure threshold of soil, BW indicate the average weight of an adult, and AET indicates people
It is exposed to the average exposure duration of heavy metal contaminants, PTMI indicates that the heavy metal of people is temporarily resistant to moon intake, and f indicates China
Heavy metal intake accounts for the specific gravity of rice intake in general population's diet, and BCF expression will protect 5% or 95% rice varieties matter
The heavy metal accumulation coefficient of safety is measured, IRR indicates the daily ingestion of pollutant concentration of people, and EF indicates that people is exposed to heavy metal pollution
The exposure frequency of object, ED indicate that people is exposed to the exposure duration of heavy metal contaminants.
Further, described that the pollution of heavy metals in rice producing region is drawn based on the heavy metal secure threshold of the soil
Point, comprising:
The heavy metal-polluted soil secure threshold to rice varieties ratio to be protected be 5% or less when, by the heavy metal
Pollution producing region is divided into cut-off area；
The heavy metal-polluted soil secure threshold to rice varieties ratio to be protected be 5%-95% when, by the heavy metal
Pollution producing region is divided into limited production area；
The heavy metal-polluted soil secure threshold to rice varieties ratio to be protected be 95% or more when, by the heavy metal
Pollution producing region divides the producing region that is advisable.
The method provided in an embodiment of the present invention for dividing pollution of heavy metals in rice producing region, is based in China's water paddy soil not
With the edible position of kind rice to bio-concentration factor (BCF) data of heavy metal, pass through species sensitivity distribution curve side
The BCF value that method obtains protection different proportion rice varieties safety is reciprocal, and is based on agricultural product quality and safety standard or health risk
Assessment, obtains the secure threshold of heavy metal in soil, divides rice producing region with this, be a kind of more scientific classification standard, real
Show the farming land based on agricultural product quality and safety to divide.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is some realities of the invention
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of method flow diagram for dividing pollution of heavy metals in rice producing region of the present invention；
Fig. 2 is species sensibility distribution curve schematic diagram of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 shows a kind of method for dividing pollution of heavy metals in rice producing region provided in an embodiment of the present invention.
As shown in Figure 1, this method comprises:
Step 101: the heavy metal accumulation coefficient of collection different cultivars rice grain and corresponding soil physico-chemical property data；
Step 102: the heavy metal accumulation coefficient of collection is screened；
Step 103: the heavy metal accumulation coefficient after screening being handled, the heavy metal of different rice varieties is obtained
Concentration coefficient；
Step 104: correction being normalized to the heavy metal accumulation coefficient of the different rice varieties, after being normalized
Different rice varieties heavy metal accumulation coefficient；
Step 105: to the cumulative probability reciprocal of the different rice varieties heavy metal accumulation coefficients after normalization be distributed into
Row fitting, obtains species sensibility distribution curve；
Step 106: the ratio of rice varieties to be protected in setting heavy metal pollution producing region；
Step 107: being based on the rice varieties ratio to be protected, in conjunction with the species sensibility distribution curve, obtain
The inverse of heavy metal accumulation coefficient corresponding with the rice varieties ratio to be protected；
Step 108: the inverse based on the heavy metal accumulation coefficient obtains the heavy metal secure threshold of soil；
Step 109: the heavy metal secure threshold based on the soil draws the pollution of heavy metals in rice producing region
Point.
The method provided in an embodiment of the present invention for dividing pollution of heavy metals in rice producing region, it is edible based on different cultivars rice
The heavy metal accumulation coefficient at position obtains a huge sum of money for protection different proportion rice varieties safety by species sensitivity distribution curve
Belong to the inverse of concentration coefficient, and be based on agricultural product quality and safety standard, obtains the secure threshold of heavy metal in soil, divided with this
Rice producing region realizes the farming land based on agricultural product quality and safety and divides.
In embodiments of the present invention, the data delivered by collection, and soil sampling is collected, to collect not
Heavy metal accumulation coefficient data and corresponding soil physico-chemical property data with kind rice grain.Concrete mode includes system
The heavy metal accumulation coefficient data in the related China typical case agricultural land soil delivered and corresponding rice grain is collected, and is had
Soil physico-chemical property data.Respectively with keyword " soil ", " heavy metal " and " water in middle National IP Network (CNKI) database
Rice seed " etc. be search condition, in Google Scholar with " soil ", " rice " and " heavy metal " etc. be search for
Condition obtains data.In addition, field research sampling, which obtains rice grain, cooperates with sample with soil, and carries out analysis test and obtain rice
Seed and heavy metal content in soil or rice grain heavy metal accumulation coefficient data and soil physico-chemical property data.Here, receiving
China's soil physico-chemical property data collection and that spot sampling obtains include at least two kinds of soil pH, soil organic matter basic natures
Matter.All soil physico-chemical property data are made into the classification of k mean value, determine 4 kinds of national soil typical scenes.
Then, the heavy metal accumulation data collected in document are screened, screening conditions include: (1) test with nature
Soil is medium, does not include water culture experiment；(2) experiment process and data processing are specifications, while there is soil and collaboration to adopt
Collect the content of beary metal data in rice grain, heavy metal accumulation coefficient (BCF) value is content of beary metal (mg/ in rice grain
Kg) with ratio that content of beary metal (mg/kg) is corresponded in soil；(3) heavy metal accumulation coefficient should indicate corresponding rice varieties.
Next, the data after processing screening obtain the heavy metal BCF data of different rice varieties.Number after judgement screening
It is not dealt with according to type if the data of screening are the heavy metal BCF value of rice edible portion.If the data after screening are
The content of beary metal C at the edible position of riceRWith the content of beary metal C in corresponding soilS, then concentration coefficient formula, that is, CR is used
The heavy metal BCF value at the edible position of rice is calculated with the quotient of CS:
In the embodiment of the present invention, if the data after screening are that same rice varieties have multiple BCF data, processing method
To use the box traction substation of SPSS software (statistical product and service solution, version number 19.0) to examine multiple BCF data and picking
Except wherein abnormal BCF data, its geometrical mean is calculated as the rice for the remaining BCF data after rejecting abnormalities data
The BCF value of kind.
In the embodiment of the present invention, the BCF data screened include field field data and laboratory data.In view of soil
Influence of the earth physicochemical property to rice absorbing heavy metal is very big, thus to the heavy metal accumulation coefficient of the different rice varieties of collection into
Row normalization, by under the BCF data normalization to specific edaphic condition of different rice varieties, while a mutation in carrying out kind,
To eliminate influence of the soil physico-chemical property difference to rice varieties BCF data.For the different rice varieties that are obtained in document
Heavy metal accumulation coefficient, while the physicochemical property in rice varieties and corresponding soil is had recorded, physicochemical property and rice are enriched with
Coefficient establishes normalization creep function:
Lg (BCF)=a × pH+b × lg (SOC)+k
Wherein, pH is soil pH value；SOC is soil organic carbon (g/kg)；A, b is dimensionless group, indicates soil
Influence degree of the property to heavy metal accumulation coefficient；K is the intercept of equation, indicates rice varieties to the intrinsic quick of Accumulation of heavy metals
Perception.
According to the above normalization formula, the heavy metal BCF of the different rice varieties under specific edaphic condition can be calculated
Value.Here, specific soil refers to 4 kinds of China soil situation typical, according to soil pH be divided into acid soil, alkaline soil, neutral soil and
The non-terra calcis of alkalinity.Normalization process is the influence in order to eliminate soil physico-chemical property to rice heavy metal accumulation coefficient, kind
Interior degree of variation reduction also shows the influence that normalized eliminates soil property to a certain extent.
In the following, describing the fitting of BCF data and the division in rice producing region in conjunction with the embodiment of the present invention.
In embodiments of the present invention, using logistic gram distributed model (logist ic) to the weight of different rice varieties
The cumulative probability distribution reciprocal of metal enrichment coefficient is fitted, and is obtained species sensibility distribution curve (SSD curve).Such as figure
Shown in 2, in the embodiment of the present invention, excellent to Feng You 9, deep two excellent 5814, Yiyou 673, H28 9113, Hunan is excellent 66, Hunan excellent 616, two
Excellent 527, II is excellent 416, T is excellent 618, Q is No. 6 excellent, elegant water 63, Hunan evening Xian 12, town rice 5171, fortune this 14 kinds of rice normalizings of round-grained rice 7
Changing to pH value is 6.04, and SOC value is that the cumulative probability distribution of the heavy metal BCF data inverse under the conditions of 9.31g/kg is intended
It closes, obtains SSD curve, in the curve, each rice varieties correspond to different cumulative probabilities.
The sensibility distribution characteristics of different rice varieties is analyzed, while it is (different tired on SSD curve to calculate protection different proportion
Product probability) the corresponding BCF reciprocal value of rice varieties, and the angle based on state food safety and sanitation standard or health risk assessment
Degree, obtains the secure threshold of heavy metal in soil.In the embodiment of the present invention, the ratio setting of rice varieties to be protected is 5%
With 95%, HC is calculated5And HC95, i.e., it is the corresponding 1/BCF value of 5% and 95% cumulative probability on SSD curve, and be based on state
Family's food hygienic standard or health risk assessment obtain the secure threshold of heavy metal in soil, and divide rice producing region with this.
Assuming that y indicates that rice edible portion content of beary metal is more than agricultural production quality when the 1/BCF value of rice varieties is x
Measure the species ratio of safety limit, i.e., when given 1/BCF is x, corresponding cumulative probability on SSD curve.Logistic model point
The formula of cloth calculating y are as follows:
Wherein, a, b, x0For dimensionless group, indicate soil property to the influence degree of heavy metal accumulation coefficient.
The 1/BCF value of corresponding 5% and 95% cumulative probability is found out by following formula:
In formula, q is 0.05 or 0.95；a,b,x0For dimensionless group, indicate soil property to heavy metal accumulation coefficient
Influence degree；HC (q) is the 1/BCF value for protecting 5% or 95% rice varieties quality safety.
SSD curve matching uses Australian Union's science and industrial research tissue (commonwealth scientific
And industrial research organization, CSIR O) provide software for calculation BurrliOZ (version 1.0.14)
It carries out.
In an embodiment of the invention, the heavy metal secure threshold in soil is obtained according to food safety quality standard,
The formula of use is as follows:
CS=CR×HC(q)
In formula, CS is the heavy metal secure threshold of soil；HC (q) is that the rice varieties quality of above-mentioned protection different proportion is pacified
Full 1/BCF value；CR is the heavy metal safety limit in rice food safety quality standard.
In an alternative embodiment of the invention, from health risk assessment angle, the heavy metal secure threshold in soil is obtained.It is first
First, according to the amount of the concentration of heavy metal in rice and rice, a man month heavy metal intake (EMI) is estimated.EMI is under
Formula determines:
In formula, CR is pollutant concentration in rice, and IRR is daily ingestion of pollutant concentration, and EF behaviour is exposed to heavy metal
The exposure frequency of pollutant, ED, which behaves, is exposed to the exposure duration of heavy metal contaminants, and BW is being averaged for an adult
Weight, AET, which behaves, is exposed to the average exposure duration of heavy metal contaminants.
Based on health risk assessment, in conjunction with the concentration coefficient formula of above-mentioned rice grain, it is assumed that EMI is equal to PTMI × f, by
This obtains heavy metal in soil secure threshold are as follows:
In formula, PTMI is that heavy metal is temporarily resistant to moon intake, and f is that Chinese general population's diet heavy metal intake accounts for water
The specific gravity of rice intake, BCF are the weight for the protection different proportion paddy quality safety derived on species sensibility distribution curve
Metal enrichment coefficient.
In embodiments of the present invention, based on the heavy metal-polluted soil secure threshold of above-mentioned acquisition, pollution of heavy metals in rice is produced
Zoning is divided into three parts, that is, should when heavy metal-polluted soil secure threshold is 5% and is following to rice varieties ratio to be protected
Rice producing region divides cut-off area into；Heavy metal-polluted soil secure threshold is somebody's turn to do to when rice varieties ratio to be protected is 95% or more
Rice producing region divides suitable producing region into；Heavy metal-polluted soil secure threshold to rice varieties ratio to be protected be 5%-95% when, the water
Rice producing region divides limited production area into.
The suitable producing region of rice, the as area of suitable for producing rice, both select can protect 95% or more rice varieties
Area is advisable producing region, the most rice varieties of the area Ze Gai suitable planting；Rice limited production area is the area for limiting Rice Production,
Both having selected can protect the area of rice varieties between 5% and 95% to be limited producing region, then this area be the life of limitation rice varieties
It produces, the plantation of the rice varieties of certain easy high accumulation heavy metals should be limited, or only consider the water of plantation part low heavy metal accumulation
Rice varieties；Rice cut-off area is the area for forbidding Rice Production, both selectes the ground that can only protect 5% and rice varieties below
Area is cut-off area, then this area forbids producing rice, can replant the crop or ornamental plant that other are not easy enriching heavy metal
Deng.
The method provided in an embodiment of the present invention for dividing pollution of heavy metals in rice producing region, it is edible based on different cultivars rice
The heavy metal accumulation coefficient at position obtains a huge sum of money for protection different proportion rice varieties safety by species sensitivity distribution curve
Belong to the inverse of concentration coefficient, and be based on agricultural product quality and safety standard or health risk assessment, obtains the peace of heavy metal in soil
Full threshold value divides rice producing region with this, realizes the farming land based on agricultural product quality and safety and divides.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of method for dividing pollution of heavy metals in rice producing region characterized by comprising
The heavy metal accumulation coefficient of collection different cultivars rice grain and corresponding soil physico-chemical property data；
The heavy metal accumulation coefficient of collection is screened；
The heavy metal accumulation coefficient after screening is handled, the heavy metal accumulation coefficient of different rice varieties is obtained；
Correction is normalized to the heavy metal accumulation coefficient of the different rice varieties, the different rice product after being normalized
The heavy metal accumulation coefficient of kind；
The cumulative probability distribution reciprocal of different rice varieties heavy metal accumulation coefficients after the normalization is fitted, is obtained
Obtain species sensibility distribution curve；
The ratio of rice varieties to be protected in heavy metal pollution producing region is set；
Based on the rice varieties ratio to be protected, in conjunction with the species sensibility distribution curve, acquisition will be protected with described
The corresponding heavy metal accumulation coefficient of rice varieties ratio inverse；
Based on the inverse of the heavy metal accumulation coefficient, the heavy metal secure threshold of soil is obtained；
Heavy metal secure threshold based on the soil divides the pollution of heavy metals in rice producing region.
2. the method according to claim 1, wherein the heavy metal accumulation for collecting different cultivars rice grain
Coefficient and corresponding soil physico-chemical property data, comprising:
Collect the content of beary metal or rice grain in the related China typical case agricultural land soil delivered and corresponding rice grain
Heavy metal accumulation coefficient, and corresponding soil physico-chemical property data；
Spot sampling obtains rice grain and with soil cooperates with sample, analyzed the heavy metal accumulation coefficient for obtaining rice grain and
Soil physico-chemical property data.
3. according to the method described in claim 2, it is characterized in that, the heavy metal accumulation coefficient of described pair of collection sieves
Choosing, including being screened to the heavy metal accumulation coefficient delivered, wherein screening conditions include:
Test does not include water culture experiment using natural soils as medium；
Experiment process and data processing standardization, while there is the content of beary metal number in soil and collaboration acquisition rice grain
According to the heavy metal accumulation coefficient refers to the ratio of corresponding content of beary metal in content of beary metal and soil in rice grain
Value；
The heavy metal accumulation coefficient should indicate corresponding rice varieties.
4. the method according to claim 1, wherein the heavy metal accumulation coefficient after described pair of screening carries out
Processing, obtains the heavy metal accumulation coefficient of different rice varieties, comprising: if same rice varieties have multiple heavy metals after screening
Concentration coefficient examines the heavy metal accumulation coefficient and rejects wherein abnormal heavy metal accumulation coefficient, to remaining heavy metal
Heavy metal accumulation coefficient of the concentration coefficient computational geometry average value as the rice varieties.
5. method according to claim 1, which is characterized in that the normalization includes, by the different rice varieties
Heavy metal accumulation coefficient normalize under specific edaphic condition, a while mutation in carrying out kind is poor to eliminate soil physico-chemical property
The influence of the different heavy metal accumulation coefficient to rice varieties, wherein normalize the model of use are as follows:
Lg (BCF)=a × pH+b × lg (SOC)+k
Wherein, BCF is heavy metal accumulation coefficient, and pH is the pH value of soil, and SOC is the organic carbon content of soil, and a, b are dimensionless
Parameter indicates soil property to the influence degree of heavy metal accumulation coefficient, and k is the intercept of equation, indicates rice varieties to a huge sum of money
Belong to the intrinsic sensibility of accumulation.
6. the method according to claim 1, wherein rice to be protected in the setting heavy metal pollution producing region
The ratio of kind is 5% and 95%.
7. according to the method described in claim 6, it is characterized in that, being obtained and the rice product to be protected by following formula
The inverse of the corresponding heavy metal accumulation coefficient of kind ratio,
Wherein, q is 5% or 95%, a, b, x0For dimensionless group, influence journey of the soil property to heavy metal accumulation coefficient is indicated
Degree, HC (q) indicate to protect the inverse of the heavy metal accumulation coefficient of 5% or 95% rice varieties quality safety.
8. the method according to the description of claim 7 is characterized in that obtaining the heavy metal safety of the soil by following formula
Threshold value,
CS=CR×HC(q)
Wherein, CSIndicate the heavy metal secure threshold of soil, HC (q) expression will protect 5% or 95% rice varieties quality safety
The inverse of heavy metal accumulation coefficient, CRIndicate the heavy metal safety limit in rice food safety quality standard.
9. the method according to the description of claim 7 is characterized in that obtaining the heavy metal safety of the soil by following formula
Threshold value,
Wherein, CS indicates that the heavy metal secure threshold of soil, BW indicate the average weight of an adult, and AET indicates people's exposure
In the average exposure duration of heavy metal contaminants, PTMI indicates that the heavy metal of people is temporarily resistant to moon intake, and f indicates that China is common
Heavy metal intake accounts for the specific gravity of rice intake in crowd's diet, and BCF expression will protect 5% or 95% rice varieties quality to pacify
Full heavy metal accumulation coefficient, IRR indicate the daily ingestion of pollutant concentration of people, and EF indicates that people is exposed to heavy metal contaminants
Exposure frequency, ED indicate that people is exposed to the exposure duration of heavy metal contaminants.
10. method according to claim 8 or claim 9, which is characterized in that the heavy metal secure threshold based on the soil
The pollution of heavy metals in rice producing region is divided, comprising:
The heavy metal-polluted soil secure threshold to rice varieties ratio to be protected be 5% or less when, by the heavy metal pollution
Producing region is divided into cut-off area；
The heavy metal-polluted soil secure threshold to rice varieties ratio to be protected be 5%-95% when, by the heavy metal pollution
Producing region is divided into limited production area；
The heavy metal-polluted soil secure threshold to rice varieties ratio to be protected be 95% or more when, by the heavy metal pollution
Producing region divides the producing region that is advisable.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112184471A (en) * | 2020-08-31 | 2021-01-05 | 农业农村部农业生态与资源保护总站 | Agricultural product yield prohibition area dividing method and system, electronic device and medium |
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| CN112184471A (en) * | 2020-08-31 | 2021-01-05 | 农业农村部农业生态与资源保护总站 | Agricultural product yield prohibition area dividing method and system, electronic device and medium |
| CN112184471B (en) * | 2020-08-31 | 2022-01-07 | 农业农村部农业生态与资源保护总站 | Agricultural product yield prohibition area dividing method and system, electronic device and medium |
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| CN109902929B (en) | 2020-07-17 |
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