CN105606538A - Detection method of sodium ions in soil - Google Patents
Detection method of sodium ions in soil Download PDFInfo
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- CN105606538A CN105606538A CN201510753208.5A CN201510753208A CN105606538A CN 105606538 A CN105606538 A CN 105606538A CN 201510753208 A CN201510753208 A CN 201510753208A CN 105606538 A CN105606538 A CN 105606538A
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Abstract
The invention discloses a detection method of sodium ions in soil. The detection method comprises following steps: soil samples to be detected are obtained; continuum removal values corresponding to characteristic wave bands of the soil samples are obtained; and the content of sodium ions in the soil samples is detected based on the continuum removal values using a sodium ion detection model, wherein the sodium ion detection model comprises the corresponding relation of the sodium ion content with the continuum removal values. The detection method is capable of solving a problem of the prior art that sodium ion content of large area salt-affected soil can not be obtained quickly.
Description
Technical field
The present invention relates to soil field, in particular to the detection method of sodium ion in a kind of soil.
Background technology
The soil salinization is arid sustainable development and the strategic issue that improves environmental quality. China's salinized soil area is large,Branch is wide, can be rated as the first in the world. According to statistics, the salination area in China arable land reaches 9.2 × 106hm2, account for the whole nation6.62% of cultivated area. The soil secondary salinization problem that soil salinization problem and irrigation cause has seriously restricted saltFurther developing of stainization area agricultural is also the key factor of influence ecological environment stability. Solvable in salinized soilProperty salt generally exists with ionic species in solution, and the too high injury for plant of base cation is called as salt damage.These ions except producing directly injury, also can produce secondary injury effect under high concentration.
The toxic action of sodium ion to plant, it is generally acknowledged that sodium is in plant interior accumulation, affect crop to calcium,The absorption of the nutriments such as potassium, destroys and makes mineral nutrition balance in object, thereby makes these ion concentrations deficiencies or causeThe destruction of balance between cation, the sodium ion Na of environment middle and high concentration+Cause Na+/ (ratio increases, and ionic equilibrium is lostWeighing apparatus, cellular metabolism disorder, causes cell death.
The existing detection method monitoring site to sodium ion in soil is few, and coverage rate is narrow, therefore representative poor and takeIn time, requires great effort, and cannot reflect the content of large area salinization soil sodium ion, can not meet the demand of large area monitoring.
For above-mentioned problem, effective solution is not yet proposed at present.
Summary of the invention
The embodiment of the present invention provides the detection method of sodium ion in a kind of soil, cannot in prior art at least to solveThe problem of quick obtaining large area salinization soil sodium ions content.
According to the embodiment of the present invention aspect, the detection method of sodium ion in a kind of soil is provided, comprising: obtainGet soil pattern to be detected; Obtain the continuum removal value that in described soil pattern, characteristic wave bands is corresponding; According to describedContinuum removal value detects the sodium ions content in described soil pattern by sodium ion detection model, wherein, and described sodiumIon detection model comprises the corresponding relation of described sodium ions content and described continuum removal value.
Alternatively, detecting the sodium in described soil pattern according to described continuum removal value by sodium ion detection modelBefore ion concentration, described method also comprises: set up described sodium ion detection model.
Alternatively, describedly set up described sodium ion detection model and comprise: in sample area, gather multiple pedotheques;Spectrum by multiple pedotheques described in spectrophotometer obtains spectroscopic data, and adopts flare photometer to describedThe sodium ions content of multiple pedotheques is measured; Remove the edge wave band of described spectroscopic data, and to removing edgeSpectroscopic data after wave band carries out continuum Transformatin, obtains continuum removal value, then obtains according to correlation analysisTo characteristic wave bands; Set up and use by polynary progressively linear regression method according to the continuum removal value that described characteristic wave bands is correspondingIn the sodium ion detection model that detects sodium ions content.
Alternatively, described characteristic wave bands comprises: 1909nm, 500nm, 2303nm, 587nm, 1946nm, 1933nm,1937nm, 592nm, 565nm, 1994nm, 717nm, 1951nm, 1930nm, 676nm, 724nm and 681nm.
Alternatively, described sodium ion detection model comprises: Y=5093.58+5773.28X1909+5077.23X500+4940.71X2303-56709.96X587-11950.40X1946+14811.55X1933-10809.23X1937+53912.91X592-17838.70X565-10243.22X1994+46865.85X717+5986.44X1951+7795.38X1930-38455.61X676-25236.56X724+21652.53X681, wherein, the X in described sodium ion detection model1909、X500、X2303、X587、X1946、X1933、X1937、X592、X565、X1994、X717、X1951、X1930、X676、X724、X681Represent respectively1909nm、500nm、2303nm、587nm、1946nm、1933nm、1937nm、592nm、565nm、1994nm、The continuum removal value at 717nm, 1951nm, 1930nm, 676nm, 724nm, 681nm place, Y is according to described sodiumThe sodium ions content that ion detection model obtains.
Alternatively, pass through polynary progressively linear regression method described according to continuum removal value corresponding to described characteristic wave bandsSet up after the sodium ion detection model for detection of sodium ions content, described method also comprises: described sodium ion is detectedModel is tested, and determines the model accuracy of described sodium ion detection model.
Alternatively, described described sodium ion detection model is tested, and determine the mould of described sodium ion detection modelType precision comprises: the modeling root-mean-square error RMSE that obtains described sodium ion detection modelc, predicted root mean square errorRMSEP, modeling coefficient of determination Rc 2, prediction coefficient of determination RP 2With relative analytical error RPD, and equal according to described modelingRoot error RMSEc, described predicted root mean square error RMSEP, described modeling coefficient of determination Rc 2, described prediction determines systemNumber RP 2Determine described model accuracy with described relative analytical error RPD; Wherein, described model accuracy is built with described respectivelyMould coefficient of determination Rc 2, prediction coefficient of determination RP 2Be proportional relationship with relative analytical error RPD; Described model accuracyRespectively with described modeling root-mean-square error RMSEcWith described predicted root mean square error RMSEPFor inversely prroportional relationship.
Alternatively, the described spectrum by multiple pedotheques described in spectrophotometer obtains spectroscopic data and comprises: according toMany curves of spectrum of each collecting soil sample, and described many curves of spectrum that gather are carried out obtaining after arithmetic averageDescribed spectroscopic data.
Adopt the detection method of sodium ion in the soil in the embodiment of the present invention, obtain soil pattern to be detected; ObtainThe continuum removal value that in described soil pattern, characteristic wave bands is corresponding; Examine by sodium ion according to described continuum removal valueSurvey model detect the sodium ions content in described soil pattern, wherein, described sodium ion detection model comprise described sodium fromThe corresponding relation of sub-content and described continuum removal value. Like this, the sodium ion providing by the embodiment of the present invention detectsModel carries out the detection of sodium ion, can obtain sodium ions content accurately, and realizes simply, fast, with low cost,Thereby solved in prior art cannot quick obtaining large area salinization soil sodium ions content problem.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, thisBright schematic description and description is used for explaining the present invention, does not form inappropriate limitation of the present invention. At accompanying drawingIn:
Fig. 1 is according to the schematic flow sheet of the detection method of sodium ion in a kind of optional soil of the embodiment of the present invention.
Detailed description of the invention
In order to make those skilled in the art person understand better the present invention program, below in conjunction with in the embodiment of the present inventionAccompanying drawing, is clearly and completely described the technical scheme in the embodiment of the present invention, obviously, and described embodimentOnly the embodiment of a part of the present invention, instead of whole embodiment. Based on the embodiment in the present invention, abilityTerritory those of ordinary skill, not making the every other embodiment obtaining under creative work prerequisite, all should belong toThe scope of protection of the invention.
It should be noted that the term " first ", " in description of the present invention and claims and above-mentioned accompanying drawingTwo " be etc. for distinguishing similar object, and needn't be used for describing specific order or precedence. Should be appreciated that thisThe data that sample uses suitably can exchanged in situation, so as embodiments of the invention described herein can with exceptHere the order beyond those of diagram or description is implemented. In addition, term " comprises " and " having " and theyAny distortion, intention is to cover not exclusive comprising, for example, the process, the side that have comprised series of steps or unitThose steps or unit that method, system, product or equipment are not necessarily limited to clearly list, but can comprise do not have clearList or for these processes, method, product or equipment intrinsic other step or unit.
Fig. 1 is according to the detection method of sodium ion detection model in the soil of the embodiment of the present invention, as shown in Figure 1, and shouldMethod comprises the steps:
Step S101, obtains soil pattern to be detected.
Wherein, can from salinization soil, gather this soil pattern.
Step S102, obtains the continuum removal value that in this soil pattern, characteristic wave bands is corresponding.
In embodiments of the present invention, this characteristic wave bands comprises: 1909nm, 500nm, 2303nm, 587nm, 1946nm,1933nm、1937nm、592nm、565nm、1994nm、717nm、1951nm、1930nm、676nm、724nmAnd 681nm.
Step S103, detects the sodium ion in this soil pattern according to this continuum removal value by sodium ion detection modelContent.
Wherein, this sodium ion detection model comprises the corresponding relation of this sodium ions content and this continuum removal value.
Alternatively, this sodium ion detection model comprises:
Y＝5093.58+5773.28X1909+5077.23X500+4940.71X2303-56709.96X587-11950.40X1946+14811.55X1933-10809.23X1937+53912.91X592-17838.70X565-10243.22X1994+46865.85X717+5986.44X1951+7795.38X1930-38455.61X676-25236.56X724+21652.53X681
Wherein, the X in this sodium ion detection model1909、X500、X2303、X587、X1946、X1933、X1937、X592、X565、X1994、X717、X1951、X1930、X676、X724、X681Represent respectively 1909nm, 500nm, 2303nm, 587nm, 1946nm,1933nm、1937nm、592nm、565nm、1994nm、717nm、1951nm、1930nm、676nm、724nm、The continuum removal value at 681nm place, Y is the sodium ions content obtaining according to this sodium ion detection model.
Like this, the sodium ion detection model providing by the embodiment of the present invention carries out the detection of sodium ion, can obtain standardTrue sodium ions content, and realize simply, fast, with low cost, cannot obtain fast thereby solved in prior artGet the problem of large area salinization soil sodium ions content.
Further, according to this continuum removal value by sodium ion detection model detect sodium in this soil pattern fromBefore sub-content, set up this sodium ion detection model.
Alternatively, set up this sodium ion detection model and can comprise lower step:
S1, in sample area, gather multiple pedotheques.
Wherein, choose sample area by Grid Sampling method and gather pedotheque, and remove gravel and animals and plants remains etc.Impurity, and natural air drying, the sample after air-dry sieves after grinding, and carries out respectively spectrum and salinity is measured for follow-up.
Illustratively, choosing Awat County, Southern Xinjiang Uygur Autonomous Region area, Hetian County, Wenxiu County, Xinhe County isSample area, it is solonchak that soil types is removed Xinhe County, all the other are rice soil; Adopt Grid Sampling method, between sampling pointDistance be about 50m, sampling depth is top layer 0-20cm. Taking sample district center as starting point, Yan Dong, south, west,North four direction sampling, the sampling point of each direction is distributed on straight line, and the soil sample weight of each collection is about 2kg,Gather altogether 188 of pedotheques, wherein 52 of Awat County, 18 of Hetian County, 77 of Wenxiu County, Xinhe County41; Remove the impurity such as gravel and animals and plants remains in pedotheque, and natural air drying, the sample after air-dry is through grindingMill rear portion is crossed 2mm sieve, and for spectroscopic assay, a part is crossed 0.25mm sieve, measures for sodium ions content.
S2, obtain spectroscopic data by the spectrum of the plurality of pedotheque of spectrophotometer, and adopt flare photometerSodium ions content to the plurality of pedotheque is measured.
In this step, according to many curves of spectrum of each collecting soil sample, and to these many curves of spectrum that gatherCarry out obtaining this spectroscopic data after arithmetic average.
It should be noted that, pedotheque after treatment is placed in the darkroom of an energy controlled light condition, and adoptSpectrometer carries out soil spectrum mensuration; In addition, before measuring, first carry out blank correction, each collecting soil sample is manyBar (as the 10) curve of spectrum, obtains the actual reflected spectrum data of this soil sample after arithmetic average.
Particularly, adopt spectrometer to carry out soil spectrum mensuration, the wave-length coverage of this spectrometer is 350-2500nm,Spectral resolution is 3nm at 350-1000nm, is 10nm at 1000-2500nm; Spectroscopic assay is an energy controlIn the darkroom of illumination condition processed; The light source adopting is that power is the Halogen lamp LED of 50W, apart from pedotheque surface 70cm,30 ° of zenith angles, make to be provided to almost parallel light of pedotheque surface, and object is to weaken because soil roughness is madeThe impact that becomes shade to bring; Pedotheque be placed on respectively inner all blackings and diameter and the degree of depth be respectively 10cm,In the culture dish of 1.5cm, soil surface is struck off with ruler. The probe that adopts 25 ° of angles of visual field, it is positioned at soilVertical direction 15cm place, surface. The soil spectrum that probe receives is the border circular areas of diameter 6.7cm, much smaller than cultivationWare area, thus the reflectance spectrum that is soil that probe receives can be ensured, before test, first carry out blank correction;10 curves of spectrum of each collecting soil sample, obtain the actual reflected spectrum data of this sample after arithmetic average.
Still taking above-mentioned sample area as Southern Xinjiang Uygur Autonomous Region area Awat County, Hetian County, Wenxiu County,The sampled data that Xinhe County obtains is that example describes, and 188 soil sodium ions content data of collection are in table 1;
Table 1
Different soils sample sodium ions content excursion is larger, between 6.84-439.38mg/kg, and modeling sampleThe standard deviation integrating is as 101.11mg/kg, and the coefficient of variation reaches 79.73%, belongs to medium variability, has larger standard deviationAnd the coefficient of variation, have more universality for the model of setting up.
S3, remove the edge wave band of this spectroscopic data, and the spectroscopic data of removing after edge wave band is carried out to continuumExcept processing, obtain continuum removal value, then obtain characteristic wave bands according to correlation analysis.
Wherein, the spectroscopic data of above-mentioned acquisition is carried out to pretreatment, then remove the spectroscopic data of each pedotheque and make an uproarThe edge wave band (as 350-399nm and 2401-2500nm) that sound is larger, retains 400-2400nm. Finally to soilEarth spectroscopic data carries out continuum Transformatin.
It should be noted that, continuum Transformatin is a kind of spectrum data processing method, can amplify absorption spectrum spyLevy, some faint absorption information are highlighted, the numerical value obtaining after treatment under each wave band is called continuumRemoval value, in embodiments of the present invention, characteristic wave bands be by spectroscopic data after treatment (being continuum removal value) withThese pedotheques carry out correlation analysis by the sodium ions content data of chemical gauging, particularly, and Mei GeboSection or high or lowly have a coefficient correlation, then looks into according to soil-like given figure the coefficient correlation that Calculation Method of Correlation Coefficient Test Table obtainsPredetermined threshold value, in the time that coefficient correlation is greater than or equal to predetermined threshold value, determine this wave band be the wave band that correlation is good,And determine that this wave band is characteristic wave bands.
In addition, continuum Transformatin is realized in remote sensing process software ENV|5.0, and continuum is removed can be effectively protrudingThe Absorption Characteristics of aobvious various materials, thus contribute to extract continuum remove in data can reflect soil in sodium ion informationSensitive features wave band.
S4, according to continuum removal value corresponding to this characteristic wave bands by polynary progressively linear regression method set up for detection ofThe sodium ion detection model of sodium ions content.
It should be noted that, the detailed process such as correlation analysis, polynary progressively linear regression of data is by SPSS18.0Software is realized.
Further, build by polynary progressively linear regression method according to continuum removal value corresponding to this characteristic wave bands at thisAfter the vertical sodium ion detection model for detection of sodium ions content, this sodium ion detection model is tested, and determineThe model accuracy of this sodium ion detection model.
Particularly, obtain the modeling root-mean-square error RMSE of this sodium ion detection modelc, predicted root mean square error RMSEP、Modeling coefficient of determination Rc 2, prediction coefficient of determination RP 2With relative analytical error RPD, and according to this modeling root-mean-square errorRMSEc, this predicted root mean square error RMSEP, this modeling coefficient of determination Rc2, this prediction coefficient of determination RP 2Divide relative with thisAnalyse error RPD and determine this model accuracy.
Wherein, this model accuracy respectively with this modeling coefficient of determination Rc2, prediction coefficient of determination RP 2With relative analytical errorRPD is proportional relationship; This model accuracy respectively with this modeling root-mean-square error RMSEcWith this predicted root mean square error RMSEPFor inversely prroportional relationship.
Illustratively, continue taking above-mentioned sample area as Southern Xinjiang Uygur Autonomous Region area Awat County, Hetian County,The sampled data that Wenxiu County, Xinhe County obtain is that example describes, and when modeling, 128 samples of random selection are for modeling(being modeling collection), remains 60 samples for model prediction (being forecast set), adopt forecast set this to the sodium of setting up fromSub-detection model is tested, and subsequently the precision of model is carried out to rational evaluation, in table 2, thus the prediction that draws modelAbility. The precision of model adopts 5 indexs to weigh, and specifically comprises modeling root-mean-square error RMSEc, prediction root mean squareError RMSEP, modeling coefficient of determination Rc 2, prediction coefficient of determination RP 2With relative analytical error RPD.
Table 2
In embodiments of the present invention, in the time of RPD < 1.4, represent that model is very poor, cannot carry out quantitative estimation to sample;In the time of 1.4 < RPD < 2.0, show that model can accept, and can carry out rough quantitative estimation to sample; When RPD >=2.0 o'clock, model had extraordinary predictive ability, therefore adopted the sodium ion detection model provided by the invention can be accurateSodium ion in true detection soil.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, do not haveThe part describing in detail, can be referring to the associated description of other embodiment.
The above is only the preferred embodiment of the present invention, it should be pointed out that the ordinary skill people for the artMember, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvement and profitDecorations also should be considered as protection scope of the present invention.
Claims (8)
1. a detection method for sodium ion detection model in soil, is characterized in that, comprising:
Obtain soil pattern to be detected;
Obtain the continuum removal value that in described soil pattern, characteristic wave bands is corresponding;
The sodium ion detecting in described soil pattern by sodium ion detection model according to described continuum removal value containsAmount, wherein, described sodium ion detection model comprises the corresponding of described sodium ions content and described continuum removal valueRelation.
2. detection method according to claim 1, is characterized in that, is passing through sodium according to described continuum removal valueIon detection model detects before the sodium ions content in described soil pattern, and described method also comprises:
Set up described sodium ion detection model.
3. detection method according to claim 2, is characterized in that, describedly sets up described sodium ion detection model bagDraw together:
In sample area, gather multiple pedotheques;
Spectrum by multiple pedotheques described in spectrophotometer obtains spectroscopic data, and adopts flame photometerMethod is measured the sodium ions content of described multiple pedotheques;
Remove the edge wave band of described spectroscopic data, and the spectroscopic data of removing after edge wave band is carried out to continuumTransformatin, obtains continuum removal value, then obtains characteristic wave bands according to correlation analysis;
Set up for inspection by polynary progressively linear regression method according to the continuum removal value that described characteristic wave bands is correspondingSurvey the sodium ion detection model of sodium ions content.
4. detection method according to claim 3, is characterized in that, described characteristic wave bands comprises: 1909nm, 500nm,2303nm、587nm、1946nm、1933nm、1937nm、592nm、565nm、1994nm、717nm、1951nm、1930nm, 676nm, 724nm and 681nm.
5. detection method according to claim 4, is characterized in that, described sodium ion detection model comprises:
Y＝5093.58+5773.28X1909+5077.23X500+4940.71X2303-56709.96X587-11950.40X1946+14811.55X1933-10809.23X1937+53912.91X592-17838.70X565-10243.22X1994+46865.85X717+5986.44X1951+7795.38X1930-38455.61X676-25236.56X724+21652.53X681；
Wherein, the X in described sodium ion detection model1909、X500、X2303、X587、X1946、X1933、X1937、X592、X565、X1994、X717、X1951、X1930、X676、X724、X681Represent respectively 1909nm, 500nm, 2303nm, 587nm,1946nm、1933nm、1937nm、592nm、565nm、1994nm、717nm、1951nm、1930nm、676nm、The continuum removal value at 724nm, 681nm place, Y is that the sodium ion obtaining according to described sodium ion detection model containsAmount.
6. detection method according to claim 3, is characterized in that, described corresponding according to described characteristic wave bandsContinuum removal value is set up for detection of the sodium ion of sodium ions content and is detected mould by polynary progressively linear regression methodAfter type, described method also comprises:
Described sodium ion detection model is tested, and determine the model accuracy of described sodium ion detection model.
7. detection method according to claim 3, is characterized in that, described described sodium ion detection model is carried outInspection, and determine that the model accuracy of described sodium ion detection model comprises:
Obtain the modeling root-mean-square error RMSE of described sodium ion detection modelC, predicted root mean square error RMSEP、Modeling coefficient of determination RC 2, prediction coefficient of determination RP 2With relative analytical error RPD, and according to described modeling root mean squareError RMSEC, described predicted root mean square error RMSEP, described modeling coefficient of determination RC 2, described prediction determines systemNumber RP 2Determine described model accuracy with described relative analytical error RPD;
Wherein, described model accuracy respectively with described modeling coefficient of determination RC 2, prediction coefficient of determination RP 2RelativelyAnalytical error RPD is proportional relationship; Described model accuracy respectively with described modeling root-mean-square error RMSECWithDescribed predicted root mean square error RMSEPFor inversely prroportional relationship.
8. detection method according to claim 3, is characterized in that, described by multiple soil described in spectrophotometerThe spectrum of earth sample obtains spectroscopic data and comprises:
According to many curves of spectrum of each collecting soil sample, and described many curves of spectrum that gather are calculatedAfter art is average, obtain described spectroscopic data.
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