A device and method for in-situ determination of current transmission in a root system

Abstract

The invention relates to the technical field of root system in-situ measurement, and proposes a device and method for in-situ determination of current transmission in a root system, wherein the device for in-situ determination of current transmission in a root system comprises: an inner cylinder containing soil, and a root outlet hole is arranged on the inner cylinder; an insulating bag is arranged on the inner side of the inner cylinder to separate the soil in the inner cylinder from the soil outside the inner cylinder; the outer cylinder and the inner cylinder are both arranged obliquely, the inner cylinder is arranged in the outer cylinder, and the soil is contained between the inner cylinder and the outer cylinder; the insulating layer isolates the soil in the outer cylinder into a shallow layer and a deep layer, and the root outlet hole is located in the shallow layer; the shallow soil electrode is in the shallow layer; the deep soil electrode is in the deep layer; the plant electrode is inserted into the plant stem; the inner cylinder detection electrode is inserted into the soil of the inner cylinder and does not contact the plant rhizome; the first outer electrode and the second outer electrode are both arranged in the soil of the outer cylinder and do not contact the plant rhizome; through the above technical scheme, the problem that the current transmission in the root system cannot be accurately determined in-situ in the related technology is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of root system in-situ measurement, and in particular to a device and method for in-situ determining the transmission status of current in a root system. Background Art

[0002] The method of measuring capacitance is widely used to measure plant roots, but its principle of measuring roots has been questioned, especially whether the current enters the root system. This has caused this method to be basically stagnant in the application of measuring roots. In order to study whether the current enters the root system, root cutting or inversion imaging methods are generally used. The root cutting method destroys the growth state of the roots, which may artificially change the law of current transmission and cannot be judged in situ; the inversion imaging method is not accurate enough. Summary of the invention

[0003] The present invention provides a device and method for in-situ determination of current transmission in a root system, which solves the problem in the related art that current transmission in a root system cannot be accurately determined in-situ.

[0004] The technical solution of the present invention is as follows:

[0005] A device for in-situ determination of current transmission in a root system, comprising:

[0006] An inner cylinder, the inner cylinder is used to contain soil, and the inner cylinder is provided with root holes;

[0007] An insulating bag, wherein the insulating bag is arranged inside the inner cylinder, and there is no soil between the inner cylinder and the insulating bag, and the insulating bag is used to separate the soil inside the inner cylinder from the soil outside the inner cylinder;

[0008] An outer cylinder, wherein the outer cylinder and the inner cylinder are both arranged obliquely, the inner cylinder is arranged inside the outer cylinder, and the space between the inner cylinder and the outer cylinder is used to hold soil;

[0009] An insulating layer, the insulating layer is arranged between the inner tube and the outer tube, the insulating layer is used to isolate the soil in the outer tube into two layers, a shallow layer and a deep layer, and the root hole is located in the shallow layer;

[0010] A shallow soil electrode, the shallow soil electrode is arranged in the shallow layer and located on one side of the root hole;

[0011] a deep soil electrode, the deep soil electrode being arranged in the deep layer;

[0012] A plant electrode, the plant electrode being used to be inserted into a stem of a plant;

[0013] An inner cylinder detection electrode, the inner cylinder detection electrode is used to be inserted into the soil of the inner cylinder and does not contact the root of the plant;

[0014] a first outer electrode, the first outer electrode being used to be arranged in the soil of the outer cylinder and not in contact with the root and stem of the plant;

[0015] The second external electrode is used to be arranged in the soil of the outer cylinder and does not contact the roots and stems of plants; the distance between the first external electrode and the inner cylinder detection electrode, the distance between the first external electrode and the deep soil electrode, and the distance between the first external electrode and the second external electrode are equal.

[0016] As a further technical solution,

[0017] The bottom of the inner cylinder is closed.

[0018] As a further technical solution,

[0019] The inner cylinder is a cylinder, and the root outlet hole is located on a half cylindrical surface of the inner cylinder.

[0020] As a further technical solution,

[0021] The inner cylinder is a cube, and the root outlet hole is arranged on one side surface of the cube.

[0022] As a further technical solution, it also includes:

[0023] A camera is arranged on one side of the root hole and is used to monitor the growth of the root system.

[0024] A method for in-situ determination of current transmission in a root system, using a device for in-situ determination of current transmission in a root system, comprising the following steps:

[0025] S1: An insulating bag is placed inside the inner tube, and soil is filled in the insulating bag. The outer tube and the inner tube are placed at an angle, and the space between the inner tube and the outer tube is filled with the same soil. An insulating layer is placed inside the outer tube, and the soil inside the outer tube is separated into a shallow layer and a deep layer.

[0026] S2: sowing along the side wall of the inner cylinder;

[0027] S3: A root hole is provided on the inner cylinder, a shallow soil electrode is provided in the shallow layer, a deep soil electrode is provided in the deep layer, a plant electrode is inserted on the growing plant stems, and an inner cylinder detection electrode is inserted in the inner cylinder avoiding the plant stems and roots; and a first outer electrode and a second outer electrode are inserted in the outer cylinder avoiding the plant roots;

[0028] When inserted, the distance between the first external electrode and the inner cylinder detection electrode, the distance between the first external electrode and the second external electrode, and the distance between the first external electrode and the deep soil electrode are equal;

[0029] Cameras are set near the shallow soil electrodes and the deep soil electrodes. When the camera near the shallow soil electrode can see the root system, the measurement starts;

[0030] S4: Soil isolation effect detection,

[0031] Measuring the capacitance value A between the first outer electrode and the inner cylinder detection electrode;

[0032] Measuring a capacitance value C between the first external electrode and the second external electrode;

[0033] Measuring the capacitance value D between the first outer electrode and the deep soil electrode;

[0034] If the values ​​of A and D are much smaller than the value of C, it means that the insulation bag and the insulation layer have good soil isolation effects;

[0035] S5: measuring the capacitance value A between the first outer electrode and the inner cylinder detection electrode;

[0036] Measuring a capacitance value B between the first external electrode and the plant electrode;

[0037] Measuring a capacitance value C between the first external electrode and the second external electrode;

[0038] S6: Results analysis,

[0039] Analyze the values ​​of A, B, and C. If A is close to 0 and B is much greater than 0, it means that the current passes through the root system. If both A and B are close to 0, it means that the current does not pass through the root system.

[0040] If A is much greater than 0, but A is significantly less than C, and B is much greater than 0, it means that the current passes through the root system;

[0041] S7: Based on the conclusion in S5 that the current passes through the root system, when the camera near the deep soil electrode can see the root system, measure the capacitance value E between the plant electrode and the shallow soil electrode, and measure the capacitance value F between the plant electrode and the deep soil electrode; if F is greater than 0, and F is greater than E, it means that the current passes through the deep root system.

[0042] As a further technical solution,

[0043] The two-terminal method is used for capacitance measurement.

[0044] The working principle and beneficial effects of the present invention are:

[0045] In the present application, in order to realize in-situ repeated measurement of the current transfer law in the root system and improve the accuracy of the measurement results, an outer cylinder, an inner cylinder, an insulating bag, a shallow soil electrode, a deep soil electrode, a plant electrode, an inner cylinder detection electrode, a first outer electrode and a second outer electrode are set, and the outer cylinder and the inner cylinder are both inclined, wherein the inner cylinder is inclined inside the outer cylinder, the space between the inner cylinder and the outer cylinder is filled with soil, and a root hole is set on the inner cylinder; the insulating bag is set on the inner side of the inner cylinder, and the inner cylinder is filled with soil. The main function of the insulating bag is to separate the soil in the inner cylinder from the soil in the outer cylinder. A nylon mesh bag can be selected for the insulating bag, so that the roots can continue to grow through the holes on the insulating bag, and there is no soil between the inner cylinder and the insulating bag; sowing is carried out at a position close to the side wall of the inner cylinder, so that the roots of the seeds can grow downward along the inclined side wall of the inner cylinder. As the roots gradually grow, a part of the roots pass through the holes on the insulating bag, and then pass through the root hole to grow into the outer cylinder. An insulating layer is provided inside the outer tube, and the insulating layer is used to isolate the soil inside the outer tube into two layers, a shallow layer and a deep layer, and the root hole is located in the shallow layer. The plant electrode is inserted into the stem of the plant, and the inner tube detection electrode is inserted into the soil of the inner tube, and the inner tube detection electrode does not contact the rhizome and root system of the plant. The first outer electrode and the second outer electrode are arranged in the soil of the outer tube, and do not contact the rhizome of the plant; the distance between the first outer electrode and the inner tube detection electrode, the distance between the first outer electrode and the deep soil electrode, and the distance between the first outer electrode and the second outer electrode are equal. By connecting two electrodes with a digital bridge, the capacitance value between the two electrodes can be measured, and then the capacitance value can be compared and calculated to obtain the law of current transmission in the root system.

[0046] The advantage of this setting is that after the plant roots grow, the roots do not need to be cut off and can be repeatedly measured in situ; the insulating bag separates the soil in the inner tube from the soil in the outer tube. The roots of the plant can pass through the holes on the insulating bag, but the soil will not be exposed from the holes on the insulating bag. This can prevent the soil in the inner tube from conducting electricity with the soil in the outer tube. After connecting the shallow soil electrode and the inner tube detection electrode, the measured data must be transmitted through the root system, rather than being mixed with the electrical signal transmitted by the contact between the soils, avoiding the problem of being unable to process abnormal data normally and improving the measurement accuracy. At the same time, the insulating layer of the outer tube soil isolates the soil in the outer tube into a shallow layer and a deep layer. The plant roots can further pass through the shallow layer to enter the deep layer, but the two layers of soil will not directly contact each other. In this way, the capacitance value obtained by using the plant electrode and the deep soil electrode must be through the deep root system, especially the capacitance value measured between the plant electrode and the shallow soil electrode, which can further verify the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] Figure 1It is a structural schematic diagram of a certain viewing angle of the present invention;

[0049] In the figure: 1, outer tube, 2, inner tube, 4, root hole, 5, insulating bag, 61, shallow soil electrode, 62, deep soil electrode, 7, plant electrode, 8, inner tube detection electrode, 9, first outer electrode, 10, second outer electrode, 11, insulating layer, 12, shallow layer, 13, deep layer. DETAILED DESCRIPTION

[0050] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] like Figure 1 As shown, this embodiment proposes a device for in-situ determination of current transmission in a root system, comprising:

[0052] An inner cylinder 2, the inner cylinder 2 is used to contain soil, and a root outlet hole 4 is provided on the inner cylinder 2;

[0053] An insulating bag 5, which is arranged inside the inner tube 2, and there is no soil between the inner tube 2 and the insulating bag 5, and the insulating bag 5 is used to separate the soil inside the inner tube 2 from the soil outside the inner tube 2;

[0054] The outer cylinder 1 and the inner cylinder 2 are both arranged obliquely, the inner cylinder 2 is arranged inside the outer cylinder 1, and the space between the inner cylinder 2 and the outer cylinder 1 is used to hold soil;

[0055] An insulating layer 11 is provided between the inner tube 2 and the outer tube 1. The insulating layer 11 is used to isolate the soil in the outer tube 1 into two layers, a shallow layer 12 and a deep layer 13. The root hole 4 is located in the shallow layer 12.

[0056] A shallow soil electrode 61 is disposed in the shallow layer 12 and is located on one side of the root hole 4;

[0057] A deep soil electrode 62, the deep soil electrode 62 is arranged in the deep layer 13;

[0058] A plant electrode 7, the plant electrode 7 is used to be inserted into the stem of a plant;

[0059] The inner cylinder detection electrode 8 is used to be inserted into the soil of the inner cylinder 2 without contacting the roots and stems of the plants;

[0060] A first external electrode 9, which is used to be arranged in the soil of the outer cylinder 1 and does not contact with the roots and stems of the plants;

[0061] The second external electrode 10 is used to be arranged in the soil of the outer cylinder 1 and does not contact the roots and stems of the plants; the distance between the first external electrode 9 and the inner cylinder detection electrode 8, the distance between the first external electrode 9 and the deep soil electrode 62, and the distance between the first external electrode 9 and the second external electrode 10 are equal.

[0062] In this embodiment, in order to realize in-situ repeated measurement of the current transfer law in the root system and improve the accuracy of the measurement result, an outer cylinder 1, an inner cylinder 2, an insulating bag 5, a shallow soil electrode 61, a deep soil electrode 62, a plant electrode 7, an inner cylinder detection electrode 8, a first outer electrode 9 and a second outer electrode 10 are provided. The outer cylinder 1 and the inner cylinder 2 are both arranged obliquely, wherein the inner cylinder 2 is arranged obliquely in the outer cylinder 1, the space between the inner cylinder 2 and the outer cylinder 1 is filled with soil, and a root outlet hole 4 is provided on the inner cylinder 2; the insulating bag 5 is arranged on the inner side of the inner cylinder 2, and the inner cylinder 2 is provided with a root outlet hole 4 ... The tube 2 is filled with soil. The main function of the insulating bag 5 is to separate the soil in the inner tube 2 from the soil in the outer tube 1. The insulating bag 5 can be a nylon mesh bag, so that the roots can continue to grow through the holes on the insulating bag 5, and there is no soil between the inner tube 2 and the insulating bag 5; sowing is carried out near the side wall of the inner tube 2, so that the roots of the seeds can grow downward along the inclined side wall of the inner tube 2. As the roots gradually grow, part of the roots pass through the holes on the insulating bag 5, and then through the root hole 4, and grow into the outer tube 1. An insulating layer 11 is provided in the outer tube 1. The insulating layer 11 is used to isolate the soil in the outer tube 1 into two layers, a shallow layer 12 and a deep layer 13. The root hole 4 is located in the shallow layer 12. The plant electrode 7 is inserted into the stem of the plant, and the inner tube detection electrode 8 is inserted into the soil of the inner tube 2. The inner tube detection electrode 8 does not contact the rhizome and root system of the plant. The first external electrode 9 and the second external electrode 10 are arranged in the soil of the outer cylinder 1 and do not contact the roots and stems of the plants; the distance between the first external electrode 9 and the inner cylinder detection electrode 8, the distance between the first external electrode 9 and the deep soil electrode 62, and the distance between the first external electrode 9 and the second external electrode 10 are equal. By connecting two electrodes with a digital bridge, the capacitance value between the two electrodes can be measured, and then the capacitance values ​​can be compared and calculated to obtain the transmission law of current in the root system.

[0063] The advantage of such a setting is that after the plant root system grows, the root system does not need to be cut off, and the in-situ measurement can be repeated; the insulating bag 5 separates the soil in the inner tube 2 from the soil in the outer tube 1, and the root system of the plant can pass through the holes on the insulating bag 5, but the soil will not be exposed from the holes on the insulating bag 5, so that the soil in the inner tube 2 and the soil in the outer tube 1 can be prevented from being electrically conductive. After the shallow soil electrode 61 and the inner tube detection electrode 8 are connected, the data measured must be transmitted through the root system, rather than being mixed with the electrical signal transmitted by the contact between the soils, thus avoiding the problem of being unable to process abnormal data normally and improving the measurement accuracy. At the same time, the insulating layer 11 of the soil in the outer tube 1 isolates the soil in the outer tube into a shallow layer 12 and a deep layer 13, and the plant root system can further pass through the shallow layer 12 to enter the deep layer 13, but the soil of the two layers will not directly contact, so the capacitance value obtained by using the plant electrode 7 and the deep soil electrode 62 must be through the deep root system, especially in combination with the capacitance value measured between the plant electrode 7 and the shallow soil electrode 61, the measurement result can be further verified.

[0064] Furthermore, the bottom of the inner tube 2 is closed.

[0065] In this embodiment, as the plant grows, the length of the plant root system may exceed the length of the inner tube 2. If the bottom of the inner tube 2 is not closed, the plant root system may grow randomly to other positions of the outer tube 1, affecting normal measurement.

[0066] Furthermore, the inner tube 2 is a cylinder, and the root outlet hole 4 is located on half of the cylindrical surface of the inner tube 2.

[0067] In this embodiment, in order to accurately measure the conduction of current in the root system, it is best for the root system to be able to grow freely. If the inner tube 2 is a cylinder, if multiple root holes 4 are arranged along the circumference, then the roots of too many plants may grow together after passing through the root holes 4, which will have a certain impact on the measurement. Therefore, when the inner tube 2 is a cylinder, the root holes 4 are located on the half cylindrical surface of the inner tube 2, so that the roots of the plants can grow freely and are not affected by the size of the root holes 4.

[0068] Furthermore, the inner tube 2 is a cube, and the root outlet hole 4 is arranged on one side surface of the cube.

[0069] In this embodiment, in order to accurately measure the conduction of current in the root system, when the inner cylinder 2 is a cube, the root hole 4 is generally arranged on one of the sides of the cube.

[0070] Furthermore, it also includes a camera, which is arranged on one side of the root hole 4 and is used to monitor the growth of the root system.

[0071] In this embodiment, it takes a certain amount of time for plants to grow, so how to determine when to start measurement is a problem that needs to be solved. Therefore, a camera is installed on one side of the root hole 4 to monitor the growth of the root system. After the camera captures roots extending out of the root hole 4, subsequent measurements can be performed. A camera is provided on one side of the shallow soil electrode 61 and the deep soil electrode 62.

[0072] A method for in-situ determination of current transmission in a root system, using a device for in-situ determination of current transmission in a root system, comprising the following steps:

[0073] S1: an insulating bag 5 is arranged inside the inner tube 2, the insulating bag 5 is filled with soil, the outer tube 1 and the inner tube 2 are both placed obliquely, the space between the inner tube 2 and the outer tube 1 is filled with the same soil, an insulating layer 11 is arranged inside the outer tube 1, and the soil inside the outer tube 1 is isolated into a shallow layer 12 and a deep layer 13;

[0074] S2: sowing seeds along the side wall of the inner tube 2;

[0075] S3: The inner cylinder 2 is provided with a root hole 4, a shallow soil electrode 61 is provided in the shallow layer 12, a deep soil electrode 62 is provided in the deep layer 13, a plant electrode 7 is inserted into the growing plant stems, and an inner cylinder detection electrode 8 is inserted into the inner cylinder 2 avoiding the plant stems and roots; and a first outer electrode 9 and a second outer electrode 10 are inserted into the outer cylinder 1 avoiding the plant roots;

[0076] When inserted, the distance between the first external electrode 9 and the inner cylinder detection electrode 8, the distance between the first external electrode 9 and the second external electrode 10, and the distance between the first external electrode 9 and the deep soil electrode 62 are equal;

[0077] Cameras are set near the shallow soil electrode 61 and the deep soil electrode 62. When the camera near the shallow soil electrode 61 can see the root system, measurement starts;

[0078] S4: Soil isolation effect detection,

[0079] Measure the capacitance value A between the first outer electrode 9 and the inner cylinder detection electrode 8;

[0080] Measuring the capacitance C between the first external electrode 9 and the second external electrode 10;

[0081] Measuring the capacitance D between the first external electrode 9 and the deep soil electrode 62;

[0082] If the values ​​of A and D are much smaller than the value of C, it means that the soil isolation effect of the insulation bag 5 and the insulation layer 11 is good;

[0083] S5: measuring the capacitance value A between the first outer electrode 9 and the inner cylinder detection electrode 8;

[0084] Measuring the capacitance value B between the first external electrode 9 and the plant electrode 7;

[0085] Measuring the capacitance C between the first external electrode 9 and the second external electrode 10;

[0086] S6: Results analysis,

[0087] Analyze the values ​​of A, B, and C. If A is close to 0 and B is much greater than 0, it means that the current passes through the root system. If both A and B are close to 0, it means that the current does not pass through the root system.

[0088] If A is much greater than 0, but A is significantly less than C, and B is much greater than 0, it means that the current passes through the root system;

[0089] S7: Based on the conclusion obtained in S5 that the current passes through the root system, when the camera near the deep soil electrode 62 can see the root system, measure the capacitance value E between the plant electrode 7 and the shallow soil electrode 61, and measure the capacitance value F between the plant electrode 7 and the deep soil electrode 62; if F is greater than 0, and F is greater than E, it means that the current passes through the deep root system.

[0090] In this embodiment, the insulating bag 5 is arranged inside the inner tube 2, the inner tube 2 is filled with soil, an insulating layer can be filled between the insulating bag 5 and the inner wall of the inner tube 2, the inner tube 2 is tilted and placed inside the outer tube 1, the space between the inner tube 2 and the outer tube 1 is filled with soil, an insulating layer 11 is arranged inside the outer tube 1, and sowing is performed near the side wall of the inner tube 2. During the growth of the seeds, care should be taken not to generate current collection when watering, so as to avoid current conduction along the water, so as to ensure that the first outer electrode 9 and the inner tube detection electrode 8, and the first outer electrode 9 and the deep soil electrode 62 are kept in an open circuit state, so as not to affect the accuracy of the subsequent measurement results, and keep the soil moisture consistent during the measurement process. When the camera can see the root system, the measurement can be started. The soil isolation effect is measured first, and the root conductivity is measured when the soil isolation effect is normal. The capacitance between the two electrodes is measured by an instrument such as a bridge, and the measured data is analyzed and compared, and finally a conclusion is drawn as to whether the current passes through the root system, and the measurement can be repeated to improve the accuracy of the results. Since the soil in the outer tube 1 is separated into a shallow layer 12 and a deep layer 13 by the insulating layer 11, it is possible to further measure whether the current passes through the deep root system based on whether the current passes through the root system, and obtain the result based on the measured data.

[0091] The capacitance value A between the first outer electrode 9 and the inner tube detection electrode 8, and the capacitance value B between the first outer electrode 9 and the plant electrode 7 are generally both in the pF level; if A is much larger than the 0nF level, but A is significantly smaller than C, and B is much larger than 0 hundreds of pF or nF level, it means that the current passes through the root system.

[0092] Furthermore, the capacitance measurement method in steps S4 and S5 is a two-terminal method.

[0093] In this embodiment, the capacitance measurement can be performed using the two-terminal method, the three-terminal method, or the four-terminal method. When the soil is relatively dry, the four-terminal method can reduce the influence of the stem and soil on the measurement. When the soil is relatively moist, the difference between the two-terminal method and the four-terminal method is not significant.

[0094] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for in-situ determination of current transmission in a root system, characterized in that: include, An inner cylinder (2), the inner cylinder (2) being used to contain soil, and the inner cylinder (2) being provided with a root outlet hole (4); The bottom of the inner cylinder (2) is closed; The inner cylinder (2) is a cylinder, and the root outlet hole (4) is located on a half cylindrical surface of the inner cylinder (2). Alternatively, the inner cylinder (2) is a cube, and the root outlet hole (4) is arranged on one of the side surfaces of the cube; an insulating bag (5), the insulating bag (5) being arranged inside the inner cylinder (2), with no soil between the inner cylinder (2) and the insulating bag (5), and the insulating bag (5) being used to separate the soil inside the inner cylinder (2) from the soil outside the inner cylinder (2); An outer cylinder (1), wherein the outer cylinder (1) and the inner cylinder (2) are both arranged at an angle, the inner cylinder (2) is arranged inside the outer cylinder (1), and the space between the inner cylinder (2) and the outer cylinder (1) is used to contain soil; an insulating layer (11), the insulating layer (11) being arranged between the inner tube (2) and the outer tube (1), the insulating layer (11) being used to isolate the soil in the outer tube (1) into two layers, a shallow layer (12) and a deep layer (13), the root hole (4) being located in the shallow layer (12); A shallow soil electrode (61), the shallow soil electrode (61) being arranged in the shallow layer (12) and located on one side of the root hole (4); A deep soil electrode (62), wherein the deep soil electrode (62) is arranged in the deep layer (13); A plant electrode (7), the plant electrode (7) being used to be inserted into a stem of a plant; An inner cylinder detection electrode (8), the inner cylinder detection electrode (8) being used to be inserted into the soil of the inner cylinder (2) and not in contact with the roots and stems of the plant; A first external electrode (9), the first external electrode (9) being used to be arranged in the soil of the outer cylinder (1) and not in contact with the roots and stems of the plants; A second external electrode (10), the second external electrode (10) is used to be arranged in the soil of the outer cylinder (1) and does not contact the roots and stems of the plants; the distance between the first external electrode (9) and the inner cylinder detection electrode (8), the distance between the first external electrode (9) and the deep soil electrode (62), and the distance between the first external electrode (9) and the second external electrode (10) are equal.

2. The device for in-situ determination of current transmission in a root system according to claim 1, characterized in that: Also includes, A camera is arranged on one side of the root outlet hole (4) and is used to monitor the growth of the root system.

3. A method for in-situ determination of current transmission in a root system, using a device for in-situ determination of current transmission in a root system according to any one of claims 1 to 2, characterized in that: The steps include: S1: an insulating bag (5) is arranged inside the inner tube (2), the insulating bag (5) is filled with soil, the outer tube (1) and the inner tube (2) are both placed at an angle, the space between the inner tube (2) and the outer tube (1) is filled with the same soil, an insulating layer (11) is arranged inside the outer tube (1), and the soil inside the outer tube (1) is separated into a shallow layer (12) and a deep layer (13); S2: sowing seeds along the side wall of the inner tube (2); S3: A root hole (4) is provided on the inner cylinder (2), a shallow soil electrode (61) is provided in the shallow layer (12), a deep soil electrode (62) is provided in the deep layer (13), a plant electrode (7) is inserted into the growing plant stem, an inner cylinder detection electrode (8) is inserted into the inner cylinder (2) avoiding the plant stem and root system; and a first outer electrode (9) and a second outer electrode (10) are inserted into the outer cylinder (1) avoiding the plant root. When inserted, the distance between the first external electrode (9) and the inner cylinder detection electrode (8), the distance between the first external electrode (9) and the second external electrode (10), and the distance between the first external electrode (9) and the deep soil electrode (62) are equal; Cameras are arranged near the shallow soil electrode (61) and the deep soil electrode (62), and measurement starts when the camera near the shallow soil electrode (61) can see the root system; S4: Soil isolation effect detection, Measuring a capacitance value A between the first outer electrode (9) and the inner cylinder detection electrode (8); Measuring a capacitance value C between the first external electrode (9) and the second external electrode (10); Measuring a capacitance value D between the first outer electrode (9) and the deep soil electrode (62); If the values ​​of A and D are both much smaller than the value of C, it means that the insulation bag (5) and the insulation layer (11) have good soil isolation effects; S5: measuring the capacitance value A between the first outer electrode (9) and the inner cylinder detection electrode (8); measuring a capacitance value B between the first external electrode (9) and the plant electrode (7); Measuring a capacitance value C between the first external electrode (9) and the second external electrode (10); S6: Results analysis, Analyze the values ​​of A, B, and C. If A is close to 0 and B is much greater than 0, it means that the current passes through the root system. If both A and B are close to 0, it means that the current does not pass through the root system. If A is much greater than 0, but A is significantly less than C, and B is much greater than 0, it means that the current passes through the root system; S7: Based on the conclusion obtained in S5 that the current passes through the root system, when the camera near the deep soil electrode (62) can see the root system, the capacitance value E between the plant electrode (7) and the shallow soil electrode (61) and the capacitance value F between the plant electrode (7) and the deep soil electrode (62) are measured; if F is greater than 0 and F is greater than E, it means that the current passes through the deep root system.

4. A method for in-situ determination of current transmission in a root system according to claim 3, characterized in that: The capacitance measurement method in steps S4 and S5 is a two-terminal method.

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