CN104331639B - A kind of soil moisture content indirect gain and fast appraisement method - Google Patents

A kind of soil moisture content indirect gain and fast appraisement method Download PDF

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CN104331639B
CN104331639B CN201410719050.5A CN201410719050A CN104331639B CN 104331639 B CN104331639 B CN 104331639B CN 201410719050 A CN201410719050 A CN 201410719050A CN 104331639 B CN104331639 B CN 104331639B
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soil
msub
mrow
moisture content
msup
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杨德军
卞正富
雷少刚
熊集兵
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China University of Mining and Technology CUMT
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Abstract

The invention discloses a kind of soil moisture content indirect gain and fast appraisement method, this method in turn includes the following steps:1st, based on survey region, design sample scheme;2nd, each sample point is sampled using core cutter method, measures the soil weight, soil moisture content and soil density;3rd, nucleoid is carried out to data using model, obtains the coefficient to be determined and coefficient correlation of different models, determine the application model of this survey region;4th, soil density test is carried out to each sample point, by resulting data generation into application model, obtains the result of soil moisture content;5th, the method for usable floor area weighted average, carries out overall calculation, with the soil moisture content of Fast Evaluation survey region to soil moisture content.The embodiment system orderliness of the invention, acquisition speed is fast, and sample size is more, can effectively reduce the heterogeneous caused uncertainty of soil space, can be applied to the area of Different Crop covering, the soil texture and topography and geomorphology.

Description

A kind of soil moisture content indirect gain and fast appraisement method
Technical field
The present invention relates to a kind of soil moisture content indirect gain and fast appraisement method, it is adaptable to reclamation engineering of land and agriculture Water in field profit engineering field is to soil moisture content long term monitoring and Fast Evaluation.
Background technology
Soil moisture content is the important parameter for characterizing soil characteristic and agricultural production situation, for " four water " conversion and cycle, Geotechnical property, crop and root growth, crop yield all play conclusive effect.Soil moisture content is measured and obtained The research of method, is always the focus that researcher is concerned about, as disclosed in application for a patent for invention number is 201310643783.0 " colorimetric estimation method of soil moisture content ";Application for a patent for invention number is that " one kind is based on frequency domain disclosed in 201310584218.1 The pipe pin type soil moisture content detection method and device of bounce technique ";Application for a patent for invention number is disclosed in 201310398355.6 " a kind of soil moisture content distributed measurement method and system ".Although it is that soil moisture content is measured and obtained that above-mentioned patent, which is directed to, Method is taken, but it is slower to soil moisture content acquisition speed;And due to the limitation of instrument quantity, sample point is on the low side, ultimately results in The special heterogeneity influence of soil is very big.
The acquisition methods of soil moisture content are a lot, and most common method mainly has weight method, tensometer method and Time Domain Reflectometry Method etc..Weight method is also referred to as oven drying method, can be with direct measurement soil moisture content, although measurement accuracy is high, but cost is higher, ageing It is poor.Tensometer method and time domain reflectometry are respectively provided with measuring speed soon, easy to operate, the advantages of accuracy is high, but big in space Yardstick and in the case of the limitation of instrument quantity, can consider not enough to soil space heterogeneity.China's reclamation engineering of land and farmland Water conservancy produces fast-developing, it is necessary to quick obtaining and the evaluation side of a kind of soil moisture content of Field Scale with scientific research Method, understands soil moisture content and soil moisture content in time, so as to be that guiding agricultural production and water-saving irrigation in time and accurately provide branch Support data.
Soil density, also known as soil cone index or soil penetration resistance, are by soil shearing resistance, compression stress and friction The overall target of the resistance of soil of the compositions such as power, is the important parameter in soil texture.Soil density to soil water movement, The growth and development of crop root, the utilization rate of chemical fertilizer etc. has important influence, can be used for evaluating and characterizing soil characteristic. Soil density is mainly by soil types, the influence of many factors such as unit weight and moisture content.Now there are some researches show, soil density with There is certain functional relation in above three factor.At present, soil density simulation and forecast model mainly have Ayers models, Upadhyaya models, Busscher models and Hernanz models etc..
Due to the measuring instrument soil density instrument of soil density the soil layer of different depth can be carried out space and when Between continuous field monitoring, it is simple with operation, to the destructive small of soil, accuracy and it is ageing the advantages of.Therefore, it is based on Soil compaction instrument can carry out the indirect determination of soil moisture content.
The content of the invention
Technical problem:The purpose of the present invention is to overcome in place of the deficiencies in the prior art that there is provided a kind of acquisition speed is fast, precision The good soil moisture content indirect gain of higher, effect and fast appraisement method.
Technical scheme:To achieve the above object, soil moisture content indirect gain of the invention and fast appraisement method, including Following steps:
Step 1, based on survey region, consider the soil texture, agrotype and topography and geomorphology, take equidistant sampling Method, design sample scheme arranges sample point;The area S of each sample pointi(i=1,2 ... N) it is 3~5m2, sampling number N is 15 ~25;
Step 2, using core cutter method each sample point is sampled, the soil weight is measured respectively to samples taken using oven drying method BDi(i=1,2 ... N) and soil moisture content θi(i=1,2 ... N);Using soil density instrument to each sample point soil layer Soil density CIi(i=1,2 ... N) repeatedly test and average;
Step 3, the area S based on sample pointi, soil weight BDi, soil moisture content θiWith soil density CIi(i=1, 2 ... N) data, utilize model:
Model 1:Ayers models
Model 2:Upadhyaya models
Model 3:Busscher models
Model 4:Hernanz models
Nucleoid is carried out, the coefficient to be determined and coefficient correlation of selected model is obtained, the maximum model of coefficient correlation is determined For the application model of this survey region;In formula:CI is soil density, kPa;BD is the soil weight, g/cm3;θ is soil quality Moisture content;D is depth, mm;A, B, C, D are the fitting constant dependent on soil types, and permanent is just;
Step 4, use soil density CI of the soil density instrument to each sample point soil layerj(j=1,2 ... M) it is many Secondary test is averaged, by soil density CIjApplication model is substituted into, soil moisture content θ is obtainedj(j=1,2 ... M);
Step 5, the method using area weighted average, pass through formula;
θ=Σ θj×Sj/ΣSj (5)
Overall calculation is carried out to the soil moisture content θ of survey region, with the soil moisture content in this evaluation study region.
The area S of each sample pointiIt is equal in magnitude or close to equal.
If the special heterogeneity of survey region is less, the soil weight BDiQuantity of sampling quantity take 3~5, utilize public affairs Formula:
BD=Σ BDi×Si/ΣSi (6)
Obtain the average value of the soil weight.
Constant airspeed value during the soil density instrument insertion soil is 30mm/s.
The soil density CI of each sample pointiAnd CIjIt is 3-5 times to take the number of times repeatedly measured.
It is described carry out nucleoid method use the method based on principle of least square method, by programming or origin softwares come Realize.
The survey region area>120m2, and the soil texture, crop species, topography and geomorphology difference it is larger when, subregion is commented The soil moisture content of valency survey region.
The depth selection is 10~20cm.
Beneficial effect:The soil moisture content indirect determination of the present invention and evaluation method, by the field sampling point degree of packing The acquisition of data, based on mathematical modeling come the soil moisture content data of quick obtaining regional scale, embodiment system orderliness is obtained Take speed fast, the destructiveness to soil is smaller, and quantity of sampling quantity is more, soil space can be effectively reduced heterogeneous caused uncertain Property, the area of Different Crop covering, the soil texture and topography and geomorphology is can be applied to, soil moisture content indirect gain is solved and fast The technical problem that speed is evaluated.The present invention can be used for reclamation engineering of land and farmland water conservancy works field, and result of calculation can be based on ARCGIS realizes visualization, i.e., mark soil moisture content data in each geographical grid in the form of landform, use difference Color characterized, the analysis available for soil moisture content Characteristics of spatio-temporal.Its acquisition speed is fast, precision is higher, favourable Soil moisture content is obtained and evaluated in agricultural management and scientific research personnel.
Brief description of the drawings
Fig. 1 is soil moisture content indirect determination and the evaluation method flow chart of the present invention;
Fig. 2 is the layout drawing of the trial zone of the present invention;
Fig. 3 is the experimental point and Ayers model simulation results comparison diagrams of the present invention;
Fig. 4 is the experimental point and Upadhyaya model simulation results comparison diagrams of the present invention.
Embodiment
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings:
The soil moisture content indirect gain and fast appraisement method of the present invention, is comprised the following steps that:
Step 1, based on survey region, consider the soil texture, agrotype and topography and geomorphology, take equidistant sampling Method, design sample scheme arranges sample point;The area S of each sample pointi(i=1,2 ... N) it is 3~5m2, sampling number N is 15 ~25;The area S of each sample pointiEqual in magnitude or close to equal, depth selection is 10~20cm.
Step 2, using core cutter method each sample point is sampled, the soil weight is measured respectively to samples taken using oven drying method BDi(i=1,2 ... N) and soil moisture content θi(i=1,2 ... N);Using soil density instrument to each sample point soil layer Soil density CIi(i=1,2 ... N) repeatedly test and average;Speed during the soil density instrument insertion soil is permanent Definite value is 30mm/s.
Step 3, the area S based on sample pointi, soil weight BDi, soil moisture content θiWith soil density CIi(i=1, 2 ... N) data, utilize model:
Model 1:Ayers models
Model 2:Upadhyaya models
Model 3:Busscher models
Model 4:Hernanz models
Nucleoid is carried out, the method for carrying out nucleoid uses the method based on principle of least square method, passes through programming or origin Software is realized;The coefficient to be determined and coefficient correlation of selected model are obtained, the maximum model of coefficient correlation is defined as originally grinding Study carefully the application model in region;In formula:CI is soil density, kPa;BD is the soil weight, g/cm3;θ is that soil quality is aqueous Rate;D is depth, mm;A, B, C, D are the fitting constant dependent on soil types, and permanent is just;The survey region area> 120m2, and the soil texture, crop species, topography and geomorphology difference it is larger when, the soil moisture content of assessing zonings survey region.
If the special heterogeneity of survey region is less, soil weight BDiQuantity of sampling quantity take 3~5, utilize formula:
BD=Σ BDi×Si/ΣSi (6)
Obtain the average value of the soil weight.
Step 4, use soil density CI of the soil density instrument to each sample point soil layerj(j=1,2 ... M) it is many Secondary test is averaged, by soil density CIjApplication model is substituted into, soil moisture content θ is obtainedj(j=1,2 ... M);Each The soil density CI of sample pointiAnd CIjIt is 3-5 times to take the number of times repeatedly measured.
Step 5, the method using area weighted average, pass through formula;
θ=Σ θj×Sj/ΣSj (5)
Overall calculation is carried out to the soil moisture content θ of survey region, with the soil moisture content in this evaluation study region.
Example 1:The Demonstration Base that the Loess Gullys restoration of the ecosystem of Shaanxi Province's Yulin City infrared ray light shine is built is chosen, is chosen Demonstrate land used B areas.Area's gradient is 4 °, and area is 8.77 mu, whole maize plantings, and application rate is 1.5Kg/ mus.Experimental field B1, B2, B3, BC points 4 kinds;Every kind of 3 sample points of sample plot, totally 12 cells.The layout drawing of trial zone is shown in Fig. 2.This area annual Rainfall about 380mm, rainy season focuses mostly in 7, August part;Annual mean ground temperature is 2111.2mm.
Experiment is from the pointer soil density instrument (measurement range of 6120 types:0~600psi, 1psi=6.89KPa), choosing With 3/4 inch diameter nose cone, respectively at September in 2013 3 days, September 24 days, October 10~20cm to 12 sample points on the 28th Soil layer, has carried out the soil weight, the measurement of the degree of packing and moisture content.
Table 1 is the coefficient to be determined and coefficient correlation of the Ayers models that nucleoid is obtained and Upadhyaya models.Fig. 3 and 4 For two model simulation results and the comparison diagram of experiment value.From figure 3, it can be seen that the moisture content and soil of Ayers modelings There is flex point in the relation curve of the degree of packing, in the flex point left and right sides, moisture content and soil density be respectively it is a kind of it is dull just Related and negative correlativing relation.From fig. 4, it can be seen that the moisture content and soil density of Upadhyaya modelings are a kind of single The negative correlativing relation of tune.
From table 1 and Fig. 3,4 as can be seen that two models have carried out good nucleoid to experimental data, and coefficient correlation is very Height, can as the survey region model.Experiment, is entered by the soil density of 12 sample points to survey region every time Row measurement, obtains the soil moisture content and its spatial distribution of different sample points in time;And soil moisture content data can be utilized The soil moisture content of the overall evaluation survey region.
From above-described embodiment as can be seen that the present invention is by the acquisition to field sampling point consolidation degrees of data, based on mathematics Model carrys out the soil moisture content data of quick obtaining regional scale, and the destructiveness to soil is smaller, and quantity of sampling quantity is more, can be effective The heterogeneous influence of soil space is reduced, the area of Different Crop covering, the soil texture and topography and geomorphology is can be applied to.
It should be pointed out that for engineering management and scientific research personnel, without departing from the technical principles of the invention, can To make some improvement or deformation, these are improved or deformation also should be regarded as protection scope of the present invention.
The parameter to be determined and coefficient correlation of 1 two models of table

Claims (2)

1. a kind of soil moisture content indirect gain and fast appraisement method, it is characterised in that comprise the following steps:
Step 1, based on survey region, consider the soil texture, agrotype and topography and geomorphology, take equidistant sampling method, if Sampling plan is counted, sample point is arranged;The area S of each sample pointiFor 3~5m2, i=1,2 ... N, sampling number N is 15~25 It is individual;
Step 2, using core cutter method each sample point is sampled, soil weight BD is measured samples taken respectively using oven drying methodiWith Soil moisture content θi, i=1,2 ... N;Use soil density CI of the soil density instrument to each sample point soil layeriRepeatedly survey Examination is averaged, i=1, and 2 ... N;
Step 3, the area S based on sample pointi, soil weight BDi, soil moisture content θiWith soil density CIiData, i= 1,2 ... N, utilize model:
Model 1:Ayers models
<mrow> <mi>C</mi> <mi>I</mi> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>A</mi> <mn>1</mn> </msub> <mo>&amp;times;</mo> <msup> <mi>BD</mi> <msub> <mi>A</mi> <mn>4</mn> </msub> </msup> <mo>)</mo> </mrow> <mo>/</mo> <mrow> <mo>(</mo> <msub> <mi>A</mi> <mn>2</mn> </msub> <mo>+</mo> <msup> <mrow> <mo>(</mo> <mrow> <mi>&amp;theta;</mi> <mo>-</mo> <msub> <mi>A</mi> <mn>3</mn> </msub> </mrow> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
Model 2:Upadhyaya models
<mrow> <mi>C</mi> <mi>I</mi> <mo>=</mo> <msub> <mi>B</mi> <mn>1</mn> </msub> <msup> <mi>BD</mi> <msub> <mi>B</mi> <mn>2</mn> </msub> </msup> <msup> <mi>e</mi> <mrow> <mo>-</mo> <msub> <mi>B</mi> <mn>3</mn> </msub> <mi>&amp;theta;</mi> </mrow> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
Model 3:Busscher models
<mrow> <mi>C</mi> <mi>I</mi> <mo>=</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <msup> <mi>&amp;theta;</mi> <msub> <mi>C</mi> <mn>2</mn> </msub> </msup> <msup> <mi>BD</mi> <msub> <mi>C</mi> <mn>3</mn> </msub> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
Model 4:Hernanz models
<mrow> <mi>C</mi> <mi>I</mi> <mo>=</mo> <msub> <mi>D</mi> <mn>1</mn> </msub> <msup> <mi>&amp;theta;</mi> <msub> <mi>D</mi> <mn>2</mn> </msub> </msup> <msup> <mi>BD</mi> <msub> <mi>D</mi> <mn>3</mn> </msub> </msup> <msup> <mi>d</mi> <msub> <mi>D</mi> <mn>4</mn> </msub> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
It is fitted, obtains the coefficient to be determined and coefficient correlation of selected model, the maximum model of coefficient correlation is defined as this The application model of survey region;In formula:CI is soil density, kPa;BD is the soil weight, g/cm3;θ is that soil quality is aqueous Rate;D is depth, mm;A, B, C, D are the fitting constant dependent on soil types, and permanent is just;
Step 4, use soil density CI of the soil density instrument to each sample point soil layerjRepeatedly test is averaged, j= 1,2 ... M, by soil density CIjApplication model is substituted into, soil moisture content θ is obtainedj, j=1,2 ... M;
Step 5, the method using area weighted average, pass through formula;
θ=∑ θj×Sj/∑Sj (5)
Overall calculation is carried out to the soil moisture content θ of survey region, with the soil moisture content in this evaluation study region;
The area S of each sample pointiIt is equal in magnitude or close to equal;
Constant airspeed value during the soil density instrument insertion soil is 30mm/s;
The soil density CI of each sample pointiAnd CIjIt is 3-5 times to take the number of times repeatedly measured;
The method being fitted uses the method based on principle of least square method, by programming or origin softwares come real It is existing;
The survey region area>120m2, and when the soil texture, crop species and larger topography and geomorphology difference, assessing zonings are ground Study carefully the soil moisture content in region;
The depth selection is 10~20cm.
2. a kind of soil moisture content indirect gain as claimed in claim 1 and fast appraisement method, it is characterised in that:If ground The special heterogeneity for studying carefully region is little, the soil weight BDiQuantity of sampling quantity take 3~5, utilize formula:
BD=∑s BDi×Si/∑Si (6)
Obtain the average value of the soil weight.
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