Joint measuring device for determining surface albedo and evaporation based on soil water and salt changes

Abstract

The application discloses a kind of based on soil water salt change determination ground surface albedo and evaporation combined measuring device, it is related to soil research technical field, including measurement main part, research chamber is equipped in measurement main part, for placing sample box in research chamber, sample box is placed on weighing device, the upper end of sample box can be covered with cover plate body, cover plate body is connected with cover plate drive device;Temperature control device is installed in measurement main part, temperature control device can be into cold wind or hot wind to research chamber;Radiation lamp is installed at the top in research chamber;Solution preparation device is equipped on measurement main part, solution preparation device can add sample solution to sample box;Above sample box is installed with albedo sensor;Control panel is installed on the surface of measurement main part.The application can be used to prepare different water content and salt content soil, to be used to study the relationship between ground surface albedo and evaporation under the change of soil water salt, low in cost and accurate in measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil research, in particular to a combined measuring device for determining surface albedo and evaporation based on soil water and salt changes. BACKGROUND

[0002] In China, there are large areas of saline soil, with an area of more than 2.0*10 5 km 2 , accounting for about 5.0% of the total available soil area in China, mainly distributed in inland arid and semi-arid and coastal areas. The engineering properties of saline soil are not only affected by its own minerals, structure and other factors, but also influenced and controlled by external climate environment. Rainfall, temperature changes will change the soil water and salt changes, which will lead to significant changes between the internal physical fields of saline soil, and the interaction between the internal physical fields of saline soil is the main factor of geological environment system disaster. Under the action of external environment, the interaction between the internal physical fields of saline soil is the key to the surface energy balance, and the surface albedo and evaporation are the key parameters affecting the surface energy balance, and the influence of rainfall and temperature changes on the surface albedo and evaporation will directly change the redistribution of surface energy, and then affect the coupling change of the internal saline soil, leading to a series of engineering problems such as salt expansion and frost heaving of engineering buildings.

[0003] Global warming has led to a clear warming trend, and the average annual precipitation and temperature in China have shown an increasing trend. Therefore, the influence of soil water and salt changes on the surface albedo and evaporation has become a hot research topic. However, at present, the influence of soil shallow water and salt changes on the surface albedo and evaporation is mainly studied by laying sensors on site, which has a long monitoring process and high cost. In addition, the surface albedo and evaporation reflect the characteristics of soil surface and have strong zonal and regional differences, so the relationship between the surface albedo and evaporation reflected by the soil shallow water and salt changes provides physical parameters for the thermal boundary conditions of the multi-field coupling model of saline soil, which has certain errors and hysteresis.

[0004] Therefore, there is an urgent need in the market for a combined measuring device for determining surface albedo and evaporation based on soil water and salt changes to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a combined measuring device for determining surface albedo and evaporation based on soil water and salt changes, which can solve the technical problems existing in the prior art. The water content and salt content in the soil can be adjusted by the solution configuration device, which is convenient for the staff to study the surface albedo and evaporation under the condition of soil water and salt changes. The whole system has low manufacturing cost, short measuring period and accurate measurement.

[0006] To achieve the above purpose, the present application provides the following scheme:

[0007] The application discloses a combined measuring device for determining the surface albedo and evaporation based on the change of soil water and salt, and is characterized by comprising a measuring main body, a research chamber is arranged in the measuring main body, a sample box is arranged in the research chamber, the sample box is arranged on a weighing device, the upper end of the sample box is covered by a cover plate body, the cover plate body is connected with a cover plate driving device, and the cover plate driving device is used for driving the cover plate body to move.

[0008] A temperature regulating device is arranged in the measuring main body, and the temperature regulating device can introduce cold air or hot air into the research chamber.

[0009] An irradiation lamp is arranged at the top of the research chamber.

[0010] A solution configuration device is further arranged on the measuring main body, and the solution configuration device can add a sample solution into the sample box.

[0011] An albedo sensor is arranged above the sample box.

[0012] A control panel is arranged on the outer surface of the measuring main body, and the weighing device, the temperature regulating device, the irradiation lamp, the solution configuration device and the albedo sensor are electrically connected with the control panel.

[0013] Preferably, one side of the research chamber is provided with an opening, a switch door is hingedly connected to the opening through a hinge, and a door handle is arranged on the switch door.

[0014] Preferably, a sealing strip is arranged on the switch door.

[0015] Preferably, a plurality of casters are arranged at the bottom of the measuring main body.

[0016] Preferably, a plurality of ventilation pipes are arranged in the measuring main body, one end of the ventilation pipe is connected with the temperature regulating device, the other end of the ventilation pipe is an air outlet, and the air outlet is arranged in the research chamber.

[0017] Preferably, a first stirring motor is arranged in the sample box, and a first stirring fan blade is connected to the output shaft of the first stirring motor.

[0018] Preferably, a soil moisture and salt sensor is arranged in the sample box, and the soil moisture and salt sensor is electrically connected with the control panel.

[0019] Preferably, the cover plate driving device comprises a base mounted on the inner wall of the research chamber, the base is provided with track grooves, the track grooves and the cover plate bodies are both two, each of the track grooves is provided with a driving motor, the output shaft of the driving motor is connected with a lead screw, the lead screw is threadedly connected with a sliding block, the sliding block is connected with an extension rod, and the extension rod is fixedly connected with one of the cover plate bodies through a connecting rod.

[0020] Preferably, the solution configuration device comprises a water storage bin and a material bin, the water storage bin and the material bin are both arranged at the upper end of the measuring main body, and the water storage bin and the material bin are in communication with the liquid storage bin through water supply pipes and feeding pipes respectively.

[0021] A second stirring motor is installed in the liquid storage bin, and a second stirring fan blade is arranged on the output shaft of the second stirring motor.

[0022] The upper end of the cover plate body is provided with a liquid inlet, the lower end of the cover plate body is provided with a liquid outlet, the inside of the cover plate body is provided with a flow cavity, and the liquid inlet and the liquid outlet are both in communication with the flow cavity.

[0023] Preferably, the cross section of the sample box is square, the side length of the sample box is 2w cm, w is half of the side length of the sample box, the height between the albedo sensor and the sample box is H, and the percentage of the reflected radiation in the test soil sample area of the sample box accepted by the albedo sensor accounts for f of the total reflected radiation.

[0024]

[0025] x = w / H;

[0026] f = 95%.

[0027] The present application has the following technical effects relative to the prior art:

[0028] In the use process, the solution configuration device can quickly configure test soil samples with different water salt contents, thereby improving the test progress of the surface albedo and evaporation under different water salt contents of the soil. And by configuring soil samples with uniform water salt content instead of the water content and salt content of the soil surface, the relationship between the surface albedo and evaporation and the water content and salt content obtained by research can provide more reasonable thermal boundary parameters for water salt multi-field coupling calculation. The related parameters of the test device are controllable, which improves the accuracy of research and measurement. In addition, the overall manufacturing cost of the equipment is low, thereby reducing the research cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0030] Fig. 1 The structural schematic diagram of the combined measuring device for determining the surface albedo and evaporation based on the soil water and salt change according to the embodiment of the present application;

[0031] Fig. 2 The front view of the cover driving device in the combined measuring device for determining the surface albedo and evaporation based on the soil water and salt change according to the embodiment of the present application;

[0032] In the figure: 1-research chamber; 11-PU stainless steel sandwich plate; 12-switch door; 13-door handle; 14-hinge; 15-sealing strip; 16-roller; 17-temperature control device; 18-ventilation duct; 19-air outlet; 2-sample box; 21-first stirring fan blade; 22-first stirring motor; 23-soil moisture and salt sensor; 3-cover driving device; 31-base; 32-rail groove; 33-driving motor; 34-sliding block; 35-connecting rod; 36-cover body; 37-liquid inlet; 38-telescopic rod; 39-screw rod; 4-solution preparation device; 41-water storage bin; 42-material bin; 43-first electromagnetic valve; 44-second electromagnetic valve; 45-liquid storage bin; 46-second stirring motor; 47-second stirring fan blade; 48-third electromagnetic valve; 49-conveying hose; 5-albedo sensor; 6-irradiation lamp; 7-electronic scale; 8-control panel; 9-measuring main body. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application also belong to the scope of protection of the present application.

[0034] The purpose of the present application is to provide a combined measuring device for determining the surface albedo and evaporation based on the soil water and salt change, which is used to solve the technical problems in the prior art. The solution preparation device can adjust the water content and salt content in the soil, which is convenient for the staff to study the surface albedo and evaporation under the soil water and salt change. The whole system has low manufacturing cost, short measuring period, and accurate measurement.

[0035] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] As shown in Figs. 1-2 The present embodiment provides a combined measuring device for determining the surface albedo and evaporation based on the changes of soil water and salt, which comprises a measuring main body 9 made of a black high-density PU stainless steel sandwich plate 11. The black PU stainless steel sandwich plate 11 can avoid the influence of the four walls on the reflected radiation, thereby affecting the measurement accuracy of the albedo. The measuring main body 9 is used to simulate the changes of the ambient temperature and radiation around the sample soil. A research chamber 1 is arranged in the measuring main body 9, and a sample box 2 is arranged in the research chamber 1 for placing the sample soil. The sample box 2 is placed on a weighing device for measuring the weight change of the soil sample during the test, thereby determining the evaporation amount of the soil. The weighing device uses an electronic scale 7 with high accuracy. The upper end of the sample box 2 can be covered with a cover plate body 36 connected with a cover plate driving device 3 for driving the cover plate body 36 to move up and down and left and right.

[0037] A temperature control device 17 is installed in the measuring main body 9, which can introduce cold air or hot air into the research chamber 1. Specifically, the temperature control device 17 is a refrigeration system in the existing air conditioner, which mainly includes a compressor, an evaporator, a throttling element and a condenser, and of course also includes a fan and a four-way valve structure. By using the conversion of the four-way valve, the flow direction of the refrigerant can be changed, thereby determining whether the indoor heat exchanger is cooling or heating. Finally, the fan blows out the cold air or hot air. These are relatively mature technologies, so they will not be described here.

[0038] An irradiation lamp 6 is installed at the top of the research chamber 1, which can be used to adjust the radiation change in the research chamber 1.

[0039] A solution preparation device 4 is also installed in the measuring main body 9, which can add a sample solution to the sample box 2, thereby changing the water content and salt content of the sample soil.

[0040] An albedo sensor 5 is installed above the sample box 2 for determining the surface albedo of the soil.

[0041] A control panel 8 is installed on the outer surface of the measuring main body 9. The weighing device, the temperature control device 17, the irradiation lamp 6, the solution preparation device 4 and the albedo sensor 5 are all electrically connected with the control panel 8, which is uniformly controlled by the control panel 8. The control panel 8 can be selected from the existing microcomputer control panel.

[0042] In actual use, the washed and dried loess sample is placed in the sample box 2, and the expected solution is prepared in the solution preparation device 4. The target value T of the ambient temperature inside the measurement body 9, the radiation W, the soil water content θ, and the soil salt content C are input through the control panel 8. Then the sample solution in the solution preparation device 4 is input into the sample box 2 for observation. During the observation period, the weight change of the electronic scale displayed on the control panel 8 and the measurement results of the surface albedo measured by the albedo sensor 5 are read, so that the surface albedo of the soil under the current water and salt content and the evaporation thereof can be obtained. In order to study the influence of different water contents on the surface albedo and evaporation of the soil under the same salt content, the target value T of the controlled ambient temperature, the radiation W, and the soil salt content C can be kept unchanged, and different soil water contents θ can be input through the control panel 8, that is, the water content of the sample soil is adjusted, and the above steps are repeated to study the relationship between the surface water content of the soil and the surface albedo and evaporation. Similarly, if it is necessary to study the influence of different salt contents on the surface albedo and evaporation of the soil under the same water content, the target value T of the controlled ambient temperature, the radiation W, and the soil water content θ can be kept unchanged, and different soil salt contents C can be input through the control panel 8, that is, the salt content of the sample soil is adjusted, and the above steps are repeated to study the relationship between the surface salt content of the soil and the surface albedo and evaporation.

[0043] In this embodiment, one side of the research chamber 1 is provided with an opening, and a switch door 12 is hinged to the opening through a hinge 14. The switch door 12 is provided with a door handle 13, and the working personnel can control the opening and closing of the switch door 12 through the door handle 13, which is convenient for the working personnel to place the sample soil and install and maintain.

[0044] In this embodiment, a sealing strip 15 (also called an inner sealing strip) is arranged on the inner side of the switch door 12. The sealing strip 15 can isolate the inside and outside air of the measurement body 9, preventing heat loss inside the measurement body 9.

[0045] In this embodiment, the bottom of the measurement body 9 is provided with a plurality of casters 16, which facilitates the movement of the measurement body 9.

[0046] In this embodiment, a plurality of ventilation ducts 18 are arranged in the measurement body 9, and the plurality of ventilation ducts 18 are arranged on the side wall and the bottom of the research chamber 1. One end of the ventilation duct 18 is connected with the temperature control device 17, and the other end of the ventilation duct 18 is an air outlet 19 located in the research chamber 1. The temperature control device 17 can deliver temperature-appropriate air to the research chamber 1 through the ventilation duct 18 and the air outlet 19, thereby controlling the ambient temperature inside the measurement body 9.

[0047] In the embodiment, the sample box 2 is provided with a first stirring motor 22, and a first stirring blade 21 is connected to an output shaft of the first stirring motor 22. The first stirring motor 22 is electrically connected to the control panel 8, and the first stirring motor 22 is controlled to be turned on or turned off by the control panel 8.

[0048] The first stirring blade 21 fixedly connected to the output shaft stirs the sample soil in the sample box 2 according to the rotation instruction issued by the control panel 8, so that the water content and the salt content of the soil are uniform. Therefore, the soil with uniform water content and salt content in the sample box 2 can replace the water content and salt content of the soil surface.

[0049] In the embodiment, the sample box 2 is provided with a soil moisture and salt sensor 23, and the soil moisture and salt sensor 23 is electrically connected to the control panel 8. The soil moisture and salt sensor 23 displays the monitoring results of the water content and the salt content of the sample in the sample box 2 on the control panel 8.

[0050] In the embodiment, the cover driving device 3 comprises a base 31, and the base 31 is installed on an inner wall of the research chamber 1. The base 31 is provided with two track grooves 32, and the track grooves 32 and cover bodies 36 are both two. Each track groove 32 is provided with a driving motor 33, an output shaft of the driving motor 33 is connected with a screw rod 39, the screw rod 39 is threadedly connected with a sliding block 34. Specifically, the sliding block 34 is provided with an internal thread, the screw rod 39 is provided with an external thread, and the sliding block 34 can abut against the bottom of the track groove 32, so that the sliding block 34 itself cannot rotate. The sliding block 34 is connected with a telescopic rod 38, the telescopic rod 38 can be a pneumatic cylinder, a hydraulic cylinder or an electric telescopic rod on the market, and the telescopic rod 38 and the driving motor 33 are both electrically connected to the control panel 8. The driving motor 33 and the telescopic rod 38 can be controlled to operate by the control panel 8. The telescopic end of the telescopic rod 38 is fixedly connected with a cover body 36 through a connecting rod 35. When the driving motor 33 or the telescopic rod 38 moves, the cover body 36 also moves correspondingly.

[0051] In actual use, the cover body 36 can be moved horizontally by the rotation of the driving motor 33, and the cover body 36 can be moved vertically up and down by the telescopic movement of the telescopic rod 38. When the soil needs to be stirred, the control panel 8 controls the two cover bodies 36 to slide to the lower side of the base 31 at the same time, and the two cover bodies 36 just cover the upper end of the sample box 2, so that the soil sample in the sample box 2 cannot splash out during the stirring process. When the soil in the sample box 2 does not need to be stirred, the control panel 8 controls the two cover bodies 36 to slide to the left and right sides of the base 31 at the same time, so that the two cover bodies 36 do not block the light emitted by the irradiation lamp 6, and the influence of the two cover bodies 36 on the measurement of the radiation during the albedo measurement process is avoided.

[0052] In the embodiment, the solution preparation device 4 comprises a water storage bin 41 and a material bin 42. The water storage bin 41 contains pure water, and the material bin 42 contains crystalline salt, such as mirabilite crystal. The water storage bin 41 and the material bin 42 are arranged at the upper end of the measuring main body 9. The water storage bin 41 and the material bin 42 are connected to the liquid storage bin 45 through a water feeding pipe and a material feeding pipe respectively. The water feeding pipe is provided with a first electromagnetic valve 43, and the material feeding pipe is provided with a second electromagnetic valve 44. Both the first electromagnetic valve 43 and the second electromagnetic valve 44 are electrically connected to the control panel 8. The control panel 8 can be used to control the delivery amount of water and crystalline salt, so as to adjust the content ratio of water and salt.

[0053] The liquid storage bin 45 is provided with a second stirring motor 46. The output shaft of the second stirring motor 46 is provided with a second stirring blade 47. The second stirring motor 46 is electrically connected to the control panel 8. The second stirring motor 46 and the second stirring blade 47 can be used to fully stir the water and the crystalline salt in the liquid storage bin 45.

[0054] The upper end of the cover plate body 36 is provided with an inlet 37, and the lower end of the cover plate body 36 is provided with an outlet. The inside of the cover plate body 36 is provided with a flow cavity. The inlet 37 and the outlet are connected to the flow cavity. In addition, the lower part of the cover plate body 36 is designed as a convex surface. The solution flowing into the flow cavity can be collected at the outlet and flow out from the outlet as soon as possible. The solution is added to the sample box 2, so as to avoid the accumulation of the solution in the cover plate body 36 and affect the accuracy of the water and salt content ratio of the soil sample. The outlet of the liquid storage bin 45 is connected to the inlet 37 through a PU material conveying hose 49. The conveying hose 49 is provided with a third electromagnetic valve 48. The third electromagnetic valve 48 is electrically connected to the control panel 8.

[0055] When it is needed to add the sample solution to the sample box 2, the control panel 8 is used to control the opening of the first electromagnetic valve 43 and the second electromagnetic valve 44. The water storage bin 41 and the material bin 42 add the expected water and crystalline salt to the liquid storage bin 45 and fully stir in the liquid storage bin 45. At the same time, the cover plate driving device 3 is used to control the two cover plate bodies 36 to cover the upper port of the sample box 2. Then, the third electromagnetic valve 48 is opened, so that the solution in the liquid storage bin 45 is conveyed to the sample box 2 through the conveying hose 49, the inlet 37 and the outlet. Then, the first stirring motor 22 is started to fully mix the soil and the solution, so as to obtain the sample soil.

[0056] In the embodiment, the cross section of the sample box 2 is square, and the bottom plate and the four walls of the sample box 2 are also black PU stainless steel sandwich plates 11. The length of the side of the sample box 2 is 2w cm, and w is half of the length of the side of the sample box 2. The height between the albedo sensor 5 and the sample box 2 is H, and the percentage of the reflected radiation accepted by the albedo sensor 5 from the area of the test soil sample in the sample box 2 is f. In order to make the reflected radiation accepted by the albedo sensor 5 all come from the test soil sample, the installation height of the albedo sensor 5 directly above the sample box 2 is determined according to the theory proposed by Siegel et al.:

[0057]

[0058] x = w / H;

[0059] f = 95%.

[0060] The final installation height H of the albedo sensor 5 can be obtained by combining the above three formulas.

[0061] The working process of the combined measuring device for determining the surface albedo and evaporation based on the change of soil water and salt is as follows:

[0062] Open the switch door 12 of the measuring main body 9, place the washed and dried loess soil sample in the sample box 2, and close the switch door 12 of the measuring main body 9. Fill the water storage bin 41 and the material bin 42 with pure water and mirabilite crystals, respectively, and input the target value T of the ambient temperature, the radiation amount W, the soil water content θ, and the soil salt content C in the measuring main body 9 through the control panel 8. First, the two cover bodies 36 slide left and right to the middle position close to the base 31, and then slide downward and cover the upper end of the sample box 2. At this time, the control panel 8 sends a command to control the first electromagnetic valve 43 and the second electromagnetic valve 44 to open and add a certain amount of pure water and mirabilite crystals into the liquid storage bin 45. Then, the control panel 8 sends a command, the first electromagnetic valve 43 and the second electromagnetic valve 44 are closed, and the second stirring motor 46 is started, so that the solution in the liquid storage bin starts to stir. After stirring, the third electromagnetic valve 48 is opened, the uniformly stirred solution enters the inside of the cover body 36 through the conveying hose 49, and then enters the sample box 2 through the liquid inlet 37 and the liquid outlet. The first stirring motor 22 drives the first stirring fan blade 21 to rotate by executing the command sent by the control panel 8, and the soil sample is stirred. After the soil is uniformly stirred, the two cover bodies 36 first slide upward, and then slide to the left and right. Then, a period of observation of the soil is entered.

[0063] During the observation period, the weight change of the electronic scale displayed on the control panel 8 and the measurement result of the ground albedo measured by the albedo sensor 5 are read, so that the ground albedo of the soil under the current water salt content and the evaporation thereof can be obtained. In order to study the influence of different water contents on the ground albedo and evaporation of the soil under the same salt content, the control environment temperature target value T, the radiation amount W and the soil salt content C can be kept unchanged, and different soil water contents θ can be input through the control panel 8, that is, the water content of the sample soil is adjusted, and the above steps are repeated, so that the relationship between the ground water content and the ground albedo and evaporation of the soil can be studied. Similarly, if it is necessary to study the influence of different salt contents on the ground albedo and evaporation of the soil under the same water content, the control environment temperature target value T, the radiation amount W and the soil water content θ can be kept unchanged, and different soil salt contents C can be input through the control panel 8, that is, the salt content of the sample soil is adjusted, and the above steps are repeated, so that the relationship between the ground salt content and the ground albedo and evaporation of the soil can be studied.

[0064] By analyzing the relationship between the ground water content and salt content and the ground albedo and evaporation of the soil, more reasonable parameters can be provided for the calculation of the thermal boundary of the multi-field water-heat coupling model.

[0065] In the specification, specific examples are applied to explain the principles and implementation modes of the present application, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range can be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A combined measuring device for determining the surface albedo and evaporation based on the change of soil water and salt, characterized in that: The utility model relates to a soil reflectance measuring device, including the measurement body, be equipped with research chamber in the measurement body, be used for placing sample box in the research chamber, the sample box places on the weighing device, the upper end of sample box can be covered with the cover plate body, the cover plate body is connected with the cover plate drive arrangement, the cover plate drive arrangement is used to drive the cover plate body moves, the temperature control device is installed in the measurement body, the temperature control device can pass into the cold wind or hot air in research chamber, the irradiation lamp is installed in the top of research chamber, the solution configuration device is still installed on the measurement body, the solution configuration device can add sample solution to the sample box, the albedo sensor is installed above the sample box, the weighing device, the temperature control device, the irradiation lamp, the solution configuration device and the albedo sensor all are with control panel electricity is connected, the first stirring motor is installed in the sample box, the first stirring motor's output shaft is connected with the first stirring fan blade, the solution configuration device includes water storage warehouse and material warehouse, the water storage warehouse and material warehouse all set up in the upper end at the measurement body, the water storage warehouse and material warehouse are connected with the liquid storage bin through water supply pipe and feeding pipe respectively, the second stirring motor is installed in the liquid storage bin, the second stirring motor's output shaft is equipped with the second stirring fan blade, the research chamber's one side is equipped with the opening, the opening passes through the hinge and is hinged with the switch door, the switch door is equipped with the door handle, the switch door is equipped with the sealing strip, the bottom of measurement body is equipped with a plurality of trundle, the measurement body is equipped with a plurality of ventilation duct, one end of ventilation duct is connected with temperature control device, the other end of ventilation duct is the air outlet, the air outlet is located in research chamber, the soil moisture and salt content sensor is installed in the sample box, the soil moisture and salt content sensor is with control panel electricity is connected, the base of cover plate drive arrangement includes, the base is installed on the inner wall of research chamber, the base is equipped with the track groove, the track groove and the cover plate body are two, every track groove is equipped with a drive motor, the output shaft of drive motor is connected with the lead screw, the lead screw is connected with a sliding block on the screw thread, the sliding block is connected with a telescopic rod, the telescopic end of telescopic rod is fixedly connected with a cover plate body through connecting rod, the upper end of cover plate body is equipped with the liquid inlet, the lower end of cover plate body is equipped with the liquid outlet, the inside of cover plate body is equipped with the flow cavity, the liquid inlet and the liquid outlet all are connected with the flow cavity, the cross section shape of sample box is square, the side length of sample box is 2w cm, w is the half of sample box side length, the height between albedo sensor and sample box is H, the percentage of the reflected radiation in total reflected radiation that albedo sensor accepts in the test soil sample area in sample box is f, x=w / H. ​ ​ ​ ​ ​ ​ ​ 2.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 1, wherein: ​ 3.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 2, characterized in that: ​ 4.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 1, characterized in that: ​ 5.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 1, characterized in that: ​ 6.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 1, characterized in that: ​ 7.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 1, characterized in that: ​ 8.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 1, wherein: ​ 9.The device for determining the combined measurement of land surface albedo and evaporation based on soil water and salt variation according to claim 1, characterized in that: ​ ​ f＝95％。

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