CN105954491B - A kind of dual tracer method of gravelly soil tillage erosion measurement - Google Patents

Abstract

The invention discloses a double tracer method for measuring the tillage erosion of gravel soil. Since the gravel content of the gravel soil is very high, the large particle size gravel cannot be fully mixed with the magnet powder, and the gravel soil cannot be accurately measured only by the magnetic tracer method. Tillage displacement of medium gravel, but the tillage displacement of fine particles in gravel soil cannot be accurately measured only by physical tracer method. Therefore, the patent of the present invention uses the combination of physical tracer method and magnetic tracer method to calculate the tillage displacement of gravel in gravel soil. Displacement and fine-grained tillage displacement, and according to the weighted average of the percentage of gravel and fine-grain content in gravel soil, the tillage displacement of gravel soil caused by tillage is calculated. The invention improves the shortcomings that the tillage erosion displacement of the gravel soil measured by the magnetic tracer method is smaller than the actual displacement and the physical tracer method cannot accurately measure the tillage displacement of fine particles in the gravel soil, and has the advantages of simple operation, quick measurement and high measurement accuracy specialty.

Description

A dual-tracer method for the determination of tillage erosion in gravel soil

technical field

The invention relates to a method for measuring tillage displacement of gravel soil, in particular to a double tracer method for measuring tillage erosion of gravel soil.

Background technique

As a new method of measuring tillage erosion, magnetic tracer technology is widely used in the measurement of tillage erosion rate due to its advantages of high measurement accuracy, convenience, simple equipment, and small workload. The main form of the magnet powder used as a tracer is fine particles. However, due to the high content of gravel in the gravel soil, the magnet powder cannot be fully mixed with the gravel, which will cause the tillage erosion rate obtained by the magnetic tracer method to be smaller than the actual gravel soil. tillage erosion rate. The present invention combines the means of the magnetic tracer method and the physical tracer method, uses the magnetic tracer and the physical tracer to measure the plowing erosion amount of fine grains and gravel in the gravel soil respectively, and uses the weighted average method to calculate the amount of erosion of the gravel soil tillage erosion rate. Therefore, the present invention can more accurately measure the tillage erosion rate of gravel soil.

Contents of the invention

The present invention is to solve above-mentioned deficiency, provides a kind of double tracer method of gravel soil tillage erosion measurement.

The above object of the present invention is achieved through the following technical solutions: a dual tracer method for the determination of gravel soil erosion, characterized in that: the magnetic tracer method and the physical tracer method are used to calculate the particle size of the gravel soil respectively. The tillage displacement of grains and the tillage displacement of gravel are weighted according to the content percentage of fine grains and gravel in the gravel soil to calculate the tillage displacement of gravel soil, and then calculate the tillage erosion rate, according to the following steps:

a), first measure the soil bulk density of the slope surface to be measured with the digging method, and use the sieving method to measure the gravel content of the gravel soil and the content of fine grains with P ₁ and P ₂ respectively;

b) It is planned that the tracer marking plot is 1.00m wide, 0.2m long, and 0.2m deep. 0.2m earth pit; the long side of the earth pit is parallel to the contour line of the slope, the excavated soil is piled up separately, and then a movable frame box with a volume of 1.00×0.20×0.25m3 made ^of wooden or metal plates is put into the soil pit;

c) The magnetic tracer uses brick and tile slag and cinder after calcined in brick kiln, the physical tracer uses dyed gravel, the particle size is between 6-13mm, and the total weight of the dyed gravel is between 2-3kg between;

d), first remove the soil with a considerable volume of the magnetic tracer plus the physical tracer, mix the dyed gravel with the soil dug out in step (b) and then mix it evenly with the magnetic tracer, according to Harada Backfill the frame box with the soil bulk density in the space, and complete it by compaction, and then remove the movable frame box around it;

e) Use a magnetic susceptibility meter to measure the magnetic strength of the plot marked by the magnetic tracer before farming, and then start farming from uphill to downhill according to the traditional farming method, and the farming path completely covers the tracer area;

f) After plowing, a metal frame with a length of 60 cm, a width of 20 cm, and a depth of 10 to 20 cm is inserted into the cultivated soil perpendicular to the original tracer plot, and the insertion depth is subject to the plowing depth;

g) Continuous sampling in the metal frame from the base of the original tracer marked area at a distance of 0.05m or 0.10m along the downhill direction until there is no magnetic tracer and dyed stones are distributed, and each sample taken is passed through a 2mm sieve , where the fine particles smaller than 2mm are placed in a plastic small bucket and mixed evenly, then the magnetic strength is measured with a magnetic susceptibility meter, and all the dyed gravels are selected from the gravel particles larger than 2mm, and the stones are taken back to the laboratory to be rinsed, and then placed in the oven Keep it at 60°C for 4-5 hours until it is dried and weighed;

h), according to the spatial distribution of the measured magnetic tracer and physical tracer, the soil displacement can be calculated as follows:

In the formula: T _m is the total soil displacement per unit tillage width (kg/m) passing through the plot baseline (x=0); C _(x) is the measured soil magnetic strength after tillage (×10 ^-5 SI) or tillage The weight of the dyed gravel recovered after (kg); C ₀ is the soil magnetic strength (×10 ^-5 SI) or the weight of small stones in the marked area before tillage (kg); M _s is the soil specific mass of the tillage layer (kg/m ² ); L is the maximum sampling distance (m);

i) According to the above sieving method, the gravel content and fine particle content in the gravel soil are respectively P ₁ and P ₂ , and the tillage displacement of the gravel in the gravel soil measured by the physical tracer method is T _m1 . The tillage displacement of fine particles in gravel soil measured by tracer method is T _m2 , then the total soil displacement per unit tillage width of gravel soil is T _m0 :

T _m0 =P ₁ T _m1 +P ₂ T _m2

j), calculate the tillage erosion rate according to the following formula according to the soil displacement:

R is the soil tillage erosion rate of a single tillage (t/hm ² ); T _m0 is the gravel soil displacement caused by tillage (kg/m); L is the length of a given slope section (m).

The double tracer method of tillage erosion measurement of gravel soil of the present invention adopts the combination of magnetic tracer and physical tracer to respectively measure the tillage erosion rate of fine grain and gravel in gravel soil, and the content of fine grain and gravel in gravel soil As a standard weighted calculation, the erosion rate of gravel soil tillage is obtained.

Compared with the prior art, the present invention has the advantages that: the present invention improves the fact that the tillage erosion displacement of the gravel soil measured by the magnetic tracer method is less than the actual displacement and that the physical tracer method cannot accurately measure the tillage displacement of fine grains in the gravel soil Disadvantages, it has the characteristics of simple operation, quick measurement and high measurement accuracy. The invention mainly solves the problem that the erosion displacement of the gravel soil is difficult to be measured, and provides scientific basis for preventing the erosion of soil and water in the gravel slope cultivated land, maintaining the productivity of the gravel soil and the like.

detailed description

Below in conjunction with embodiment the present invention is further described in detail.

A dual-tracer method for the determination of tillage erosion in gravel soil, which uses the combination of magnetic tracer method and physical tracer method to calculate the tillage displacement of fine particles in gravel soil and the tillage displacement of gravel respectively, and according to the fine-grained displacement in gravel soil Weighted with the content percentage of gravel to calculate the tillage displacement of the gravel soil, and then calculate the tillage erosion rate, according to the following steps:

a), first measure the soil bulk density of the slope surface to be measured with the digging method, and use the sieving method to measure the gravel content of the gravel soil and the content of fine grains with P ₁ and P ₂ respectively;

b) It is planned that the tracer marking plot is 1.00m wide, 0.2m long, and 0.2m deep. 0.2m earth pit; the long side of the earth pit is parallel to the contour line of the slope, the excavated soil is piled up separately, and then a movable frame box with a volume of 1.00×0.20×0.25m3 made ^of wooden or metal plates is put into the soil pit;

c) The magnetic tracer uses brick and tile slag and cinder after calcined in brick kiln, the physical tracer uses dyed gravel, the particle size is between 6-13mm, and the total weight of the dyed gravel is between 2-3kg between;

d), first remove the soil with a considerable volume of the magnetic tracer plus the physical tracer, mix the dyed gravel with the soil dug out in step (b) and then mix it evenly with the magnetic tracer, according to Harada Backfill the frame box with the soil bulk density in the space, and complete it by compaction, and then remove the movable frame box around it;

e) Use a magnetic susceptibility meter to measure the magnetic strength of the plot marked by the magnetic tracer before farming, and then start farming from uphill to downhill according to the traditional farming method, and the farming path completely covers the tracer area;

f) After plowing, a metal frame with a length of 60 cm, a width of 20 cm, and a depth of 10 to 20 cm is inserted into the cultivated soil perpendicular to the original tracer plot, and the insertion depth is subject to the plowing depth;

g) Continuous sampling in the metal frame from the base of the original tracer marked area at a distance of 0.05m or 0.10m along the downhill direction until there is no magnetic tracer and dyed stones are distributed, and each sample taken is passed through a 2mm sieve , where the fine particles smaller than 2mm are placed in a plastic small bucket and mixed evenly, then the magnetic strength is measured with a magnetic susceptibility meter, and all the dyed gravels are selected from the gravel particles larger than 2mm, and the stones are taken back to the laboratory to be rinsed, and then placed in the oven Keep it at 60°C for 4-5 hours until it is dried and weighed;

h), according to the spatial distribution of the measured magnetic tracer and physical tracer, the soil displacement can be calculated as follows:

In the formula: T _m is the total soil displacement per unit tillage width (kg/m) passing through the plot baseline (x=0); C _(x) is the measured soil magnetic strength after tillage (×10 ^-5 SI) or tillage The weight of the dyed gravel recovered after (kg); C ₀ is the soil magnetic strength (×10 ^-5 SI) or the weight of small stones in the marked area before tillage (kg); M _s is the soil specific mass of the tillage layer (kg/m ² ); L is the maximum sampling distance (m);

i) According to the above sieving method, the gravel content and fine particle content in the gravel soil are respectively P ₁ and P ₂ , and the tillage displacement of the gravel in the gravel soil measured by the physical tracer method is T _m1 . The tillage displacement of fine particles in gravel soil measured by tracer method is T _m2 , then the total soil displacement per unit tillage width of gravel soil is T _m0 :

T _m0 =P ₁ T _m1 +P ₂ T _m2

j), calculate the tillage erosion rate according to the following formula according to the soil displacement:

R is the soil tillage erosion rate of a single tillage (t/hm ² ); T _m0 is the gravel soil displacement caused by tillage (kg/m); L is the length of a given slope section (m).

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the content of the embodiments, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (1)

1. The double tracer method of gravel soil tillage erosion measurement is characterized in that: adopt the means that magnetic tracer method and physical tracer method combine to calculate respectively the tillage displacement of fine grain in gravel soil and the tillage displacement of gravel, and According to the content percentage of fine grains and gravel in the gravel soil, the tillage displacement of the gravel soil is calculated by weighting, and then the tillage erosion rate is calculated according to the following steps: a), first measure the soil bulk density of the slope surface to be measured with the digging method, and use the sieving method to measure the gravel content of the gravel soil and the fine particle content with P1 and P2 _{respectively ;} b) It is planned that the tracer marking plot is 1.00m wide, 0.2m long, and 0.2m deep. 0.2m earth pit; the long side of the earth pit is parallel to the contour line of the slope, the excavated soil is piled up separately, and then a movable frame box with a volume of 1.00×0.20×0.25m3 made ^of wooden or metal plates is put into the soil pit; c) The magnetic tracer uses brick and tile slag and cinder after calcined in brick kiln, the physical tracer uses dyed gravel, the particle size is between 6-13mm, and the total weight of the dyed gravel is between 2-3kg between; d), first remove the soil with a considerable volume of the magnetic tracer plus the physical tracer, mix the dyed gravel with the soil dug out in step (b) and then mix it evenly with the magnetic tracer, according to Harada Backfill the frame box with the soil bulk density in the space, and complete it by compaction, and then remove the movable frame box around it; e) Use a magnetic susceptibility meter to measure the magnetic strength of the plot marked by the magnetic tracer before farming, and then start farming from uphill to downhill according to the traditional farming method, and the farming path completely covers the tracer area; f) After plowing, a metal frame with a length of 60 cm, a width of 20 cm, and a depth of 10 to 20 cm is inserted into the cultivated soil perpendicular to the original tracer plot, and the insertion depth is subject to the plowing depth; g) Continuous sampling in the metal frame from the base of the original tracer marked area at a distance of 0.05m or 0.10m along the downhill direction until there is no magnetic tracer and dyed stones are distributed, and each sample taken is passed through a 2mm sieve , where the fine particles smaller than 2mm are placed in a plastic small bucket and mixed evenly, then the magnetic strength is measured with a magnetic susceptibility meter, and all the dyed gravels are selected from the gravel particles larger than 2mm, and the stones are taken back to the laboratory to be rinsed, and then placed in the oven Keep it at 60°C for 4-5 hours until it is dried and weighed; h), according to the spatial distribution of the measured magnetic tracer and physical tracer, the soil displacement can be calculated as follows: <mrow><msub><mi>T</mi><mi>m</mi></msub><mo>=</mo><msubsup><mo>&amp;Integral;</mo><mn>0</mn><mi>L</mi></msubsup><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mfrac><mrow><mi>C</mi><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow></mrow><msub><mi>C</mi><mn>0</mn></msub></mfrac><mo>)</mo></mrow><msub><mi>M</mi><mi>s</mi></msub><mo>&amp;CenterDot;</mo><mi>d</mi><mi>x</mi></mrow> In the formula: T _m is the total soil displacement per unit tillage width (kg/m) passing through the plot baseline (x=0); C _(x) is the measured soil magnetic strength after tillage (×10 ^-5 SI) or tillage The weight of the dyed gravel recovered after (kg); C ₀ is the soil magnetic strength (×10 ^-5 SI) or the weight of small stones in the marked area before tillage (kg); M _s is the soil specific mass of the tillage layer (kg/m ² ); L is the maximum sampling distance (m); i) According to the above sieving method, the gravel content and fine particle content in the gravel soil are respectively P ₁ and P ₂ , and the tillage displacement of the gravel in the gravel soil measured by the physical tracer method is T _m1 . The tillage displacement of fine particles in gravel soil measured by tracer method is T _m2 , then the total soil displacement per unit tillage width of gravel soil is T _m0 : T _m0 =P ₁ T _m1 +P ₂ T _m2 j), calculate the tillage erosion rate according to the following formula according to the soil displacement: <mrow><mi>R</mi><mo>=</mo><mfrac><mrow><mn>10</mn><msub><mi>T</mi><mrow><mi>m</mi><mn>0</mn></mrow></msub></mrow><mi>L</mi></mfrac></mrow> R is the soil tillage erosion rate of a single tillage (t/hm ² ); T _m0 is the gravel soil displacement caused by tillage (kg/m); L is the length of a given slope section (m).