CN220271323U

CN220271323U - Portable soil respiration measuring device

Info

Publication number: CN220271323U
Application number: CN202321413587.XU
Authority: CN
Inventors: 王炳尧; 刘智贤; 李云飞; 杨昊天; 刘立超; 肖庆红; 王占军; 吴旭东
Original assignee: Northwest Institute of Eco Environment and Resources of CAS
Current assignee: Northwest Institute of Eco Environment and Resources of CAS
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2023-12-29
Anticipated expiration: 2033-06-05

Abstract

The application provides a portable soil respiration measuring device, relates to the technical field of environmental parameter measurement, and the portable soil respiration measuring device comprises a shell, a cutting ring, a soil reaction chamber and an atmosphere reaction chamber; the shell is provided with a first cavity and a second cavity which are mutually independent, the ring cutter is connected with the bottom of the shell, and the area surrounded by the ring cutter is communicated with the first cavity; the soil reaction chamber is arranged in the first cavity and communicated with the first cavity, and the atmosphere reaction chamber is arranged in the second cavity and communicated with the second cavity. When the measuring device operates, the influence of the original carbon dioxide amount in the atmosphere on the measuring result can be reduced, and the accuracy of the measuring result is improved; meanwhile, the environment-friendly type solar energy collector is small in environmental factors, wide in use scene and convenient to use.

Description

Portable soil respiration measuring device

Technical Field

The utility model relates to the technical field of environmental parameter measurement, in particular to a portable soil respiration measurement device.

Background

Soil respiration is an important component of carbon circulation in the terrestrial ecosystem and is also an important way of carbon export between the soil carbon reservoir and the atmospheric carbon reservoir. The tiny change of soil respiration can trigger CO in the atmosphere ₂ Concentration changes drastically, so focusing on the process of dynamic changes in soil respiration is one of the essential links for understanding the problems associated with soil carbon circulation. In arid region ecosystems, soil moisture availability directly related to precipitation is a major driving variable for ecosystem processes including carbon recycling. Precipitation in these areas typically occurs as discrete contingencies. Originally dry soil is irregularly broken by precipitation pulse, the availability of moisture is improved in a short period, and carbon in the soil is driven to flow out in a soil respiration mode. In the process of soil from drought to rewet, a small rainfall event can start the microbial activity of surface soil, and a large rainfall pulse can wet deep soil to cause CO ₂ And (5) discharging. Because rainfall occurs in arid regions often in short time and small rainfall, the existing instrument and equipment can hardly directly measure CO caused by the rainfall pulse effect in the field after the rainfall occurs ₂ Emissions, in addition, common instrumentation measures CO ₂ The method comprises manufacturing a closed air chamber, pumping air into the air chamber by a suction air pump, and measuring CO in the air chamber ₂ Flux.

The inventor researches find that the existing soil respiration measuring device has at least the following disadvantages:

inevitably measuring the CO present in the original air ₂ The measurement error is caused, meanwhile, the instrument and the equipment are required to be electrically driven, the portable and debugging are not easy, and the temporary drop occurs in the fieldAnd cannot be measured quickly after rain.

Disclosure of Invention

The utility model aims to provide a portable soil respiration measuring device which can improve the accuracy of a measuring result, is independent of electric energy driving, and is good in portability and flexible to use.

Embodiments of the present utility model are implemented as follows:

the utility model provides a portable soil respiration measuring device, comprising:

the device comprises a shell, a cutting ring, a soil reaction chamber and an atmosphere reaction chamber; the shell is provided with a first cavity and a second cavity which are mutually independent, the cutting ring is connected with the bottom of the shell, and the area surrounded by the cutting ring is communicated with the first cavity; the soil reaction chamber is arranged in the first cavity and is communicated with the first cavity, and the atmosphere reaction chamber is arranged in the second cavity and is communicated with the second cavity.

In an alternative embodiment, a first sealing ring is arranged between the ring cutter and the casing.

In an alternative embodiment, the ring cutter is provided with a first butt joint end, the casing is provided with a second butt joint end, one of the first butt joint end and the second butt joint end is provided with an annular positioning groove, the first butt joint end is spliced with the second butt joint end, and the first sealing ring is positioned in the annular positioning groove.

In an alternative embodiment, the casing includes first annular shell, second annular shell, baffle and top cap, the one end of first annular shell with the cutting ring is connected, the other end of first annular shell with the one end of second annular shell is connected, the other end of second annular shell with the top cap is connected, the baffle is located between first annular shell and the second annular shell, the baffle with first annular shell cooperation defines first cavity, the baffle, second annular shell and top cap cooperation define the second cavity.

In an alternative embodiment, the soil reaction chamber is detachably connected with the first annular housing to be inserted into or removed from the first chamber.

In an alternative embodiment, the atmospheric reaction chamber is detachably connected with the second annular housing to be inserted into or removed from the second chamber.

In an alternative embodiment, the cover is provided as a light shield.

In an alternative embodiment, a second sealing ring is sleeved outside the partition plate, and the second sealing ring is connected to the first annular shell and the second annular shell at the same time.

In an alternative embodiment, the first annular shell is threaded with the second annular shell.

In an alternative embodiment, the inner wall of the first annular shell is provided with an internal thread and a baffle ring, and the baffle ring is positioned on one side of the internal thread, which is close to the cutting ring; the baffle plate is arranged on the baffle ring; the outer wall of the second annular shell is provided with an external thread which is in threaded connection with the internal thread, and the second annular shell is abutted to the partition plate.

The embodiment of the utility model has the beneficial effects that:

to sum up, this embodiment provides a portable soil respiration survey device, before soil respiration survey, inserts the cutting ring in soil to after cutting ring and soil combine, first cavity passes through cutting ring and outside air separation, all does not have outside air to get into in first cavity and the second cavity. In the test, quantitative carbon dioxide absorption liquid is placed in the soil reaction chamber and the atmosphere reaction chamber, and the test is stopped after the reaction is carried out for a set time or the carbon dioxide absorption liquid in the reaction chamber is completely reacted. At this time, CO breathed out by the soil ₂ The value is the CO absorbed by the absorption liquid in the soil reaction chamber ₂ Amount and absorption of CO by absorption liquid in atmospheric reaction chamber ₂ Difference in amounts. By arranging the atmosphere reaction chamber, the CO originally existing in the atmosphere is fully considered ₂ Can reduce the original CO in the atmosphere ₂ The influence on the measurement result is high, and the measurement result is high in accuracy. Meanwhile, the whole device does not need to be connected with electricity, the influence of electricity utilization environment is small, the use occasion is wide, and the use is convenient and flexible.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a portable soil respiration measuring device according to an embodiment of the present utility model;

fig. 2 is a schematic view of a part of a casing according to an embodiment of the utility model.

Icon:

100-a shell; 101-a first chamber; 102-a second chamber; 110-a first annular shell; 120-a second annular shell; 130-a separator; 140-top cap; 150-a first sealing ring; 160-a second sealing ring; 170-a baffle ring; 200-cutting ring; 300-soil reaction chamber; 310-a first reagent inlet and outlet; 320-a first pH meter; 400-atmosphere reaction chamber; 410-second reagent access; 420-second pH meter.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the prior art, when measuring soil respiration, the existing measurement method is to manufacture a closed air chamber, pump air into the air chamber by a suction air pump, and then measure CO in the air chamber ₂ Flux of the squareThe method inevitably measures the CO existing in the original air ₂ The measurement error is caused, meanwhile, the instrument and the equipment are required to be electrically driven, the device is not portable and complicated to debug, and the device cannot be rapidly measured after temporary rainfall occurs in the field.

In view of this, designers have provided a portable soil respiration measurement device that can reduce the influence of the original carbon dioxide amount in the atmosphere on the measurement result, improving the accuracy of the measurement result; meanwhile, the environment-friendly type solar energy collector is small in environmental factors, wide in use scene and convenient to use.

Referring to fig. 1-2, in the present embodiment, the portable soil respiration measuring device includes a housing 100, a cutter ring 200, a soil reaction chamber 300 and an atmosphere reaction chamber 400; the casing 100 is provided with a first chamber 101 and a second chamber 102 which are mutually independent, the ring cutter 200 is connected with the bottom of the casing 100, and the area surrounded by the ring cutter 200 is communicated with the first chamber 101; the soil reaction chamber 300 is provided in the first chamber 101 and communicates with the first chamber 101, and the atmosphere reaction chamber 400 is provided in the second chamber 102 and communicates with the second chamber 102.

In view of the above, the working principle of the portable soil respiration measuring device provided in this embodiment is as follows:

before soil respiration measurement, the cutter ring 200 is inserted into the soil, and after the cutter ring 200 is combined with the soil, the first chamber 101 is blocked from the outside air by the cutter ring 200, and no outside air enters into the first chamber 101 and the second chamber 102. In the test, a fixed amount of carbon dioxide absorbing liquid is placed in each of the soil reaction chamber 300 and the atmospheric reaction chamber 400, and the test is stopped after the reaction is performed for a predetermined time or after the carbon dioxide absorbing liquid in the reaction chamber is completely reacted. At this time, CO breathed out by the soil ₂ The value is the CO absorbed by the absorption liquid in the soil reaction chamber 300 ₂ Amount of CO absorbed by the absorption liquid in the atmospheric reaction chamber 400 ₂ Difference in amounts. By providing the atmosphere reaction chamber 400, the CO originally existing in the atmosphere is fully considered ₂ Can reduce the original CO in the atmosphere ₂ The influence on the measurement result is high, and the measurement result is high in accuracy. Meanwhile, the whole device does not need to be connected with electricity, the influence of electricity utilization environment is small, the use occasion is wide, and the use is convenient and flexible.

The following examples illustrate the detailed structure of the portable soil respiration measuring device provided herein.

In this embodiment, optionally, the casing 100 is configured as a split structure, and the casing 100 includes a first annular casing 110, a second annular casing 120, a partition 130, a top cover 140, a first sealing ring 150, and a second sealing ring 160. The cross-sectional profiles of the first annular shell 110 and the second annular shell 120 are both circular. The partition 130 and the top cover 140 are circular plates. The first annular housing 110 interfaces with the second annular housing 120, and an end of the first annular housing 110 remote from the second annular housing 120 is configured to couple with a cutting ring 200. The partition 130 is disposed between the first annular housing 110 and the second annular housing 120, and the top cover 140 is connected to the second annular housing 120. As such, the partition 130 and the first annular shell 110 cooperate to define the first chamber 101, and the partition 130, the second annular shell 120, and the top cover 140 cooperate to define the second chamber 102.

Specifically, the first annular housing 110 has a first end and a second end opposite to each other, the first end is provided with an annular positioning groove, the first sealing ring 150 is embedded in the annular positioning groove, the ring cutter 200 is used for abutting against the first end, and the ring cutter 200 and the first annular housing 110 both squeeze the first sealing ring 150, so that the tightness of the connection position between the ring cutter 200 and the first annular housing 110 is improved. Meanwhile, an inner thread and a baffle ring 170 are arranged on the inner wall of the first annular shell 110, the baffle ring 170 is a circular ring, the baffle ring 170 is located on one side of the inner thread close to the first end, and one end of the inner thread away from the baffle ring 170 extends to the end face where the second end is located. Further, the inner wall surface of the second end may be provided with rounded corners to facilitate insertion of the second annular housing 120 into the second end. Meanwhile, a first fitting hole is provided on a wall of the first annular housing 110.

The second annular shell 120 has a third end and a fourth end opposite to each other, and an outer wall surface of the second annular shell 120 is provided with an external thread, and one end of the external thread extends to an end surface where the third end is located. The third end of the second annular housing 120 is inserted into the second end of the first annular housing 110, and the external thread is screwed and fixed with the internal thread. The baffle 130 is placed on the baffle ring 170, the second sealing ring 160 is sleeved outside the baffle 130, and the second annular shell 120 compresses the second sealing ring 160 and the baffle 130 on the baffle ring 170, so that the sealing fit of the first annular shell 110, the second annular shell 120 and the baffle 130 is realized. Meanwhile, a second fitting hole is provided on a wall of the second annular housing 120.

The top cap 140 may be coupled to the fourth end of the second annular housing 120 by a snap fit, screw, or the like. Also, the top cover 140 may be provided as a light shield.

Alternatively, the soil reaction chamber 300 may be provided in a semicircular shell structure, the top of the soil reaction chamber 300 is open, and when assembled, the soil reaction chamber 300 is detachably connected to the first annular shell 110, and the soil reaction chamber 300 can be embedded in the first assembly hole. And when the soil reaction chamber 300 is located in the first fitting hole, the soil reaction chamber 300 seals the first fitting hole, and the top of the soil reaction chamber 300 communicates with the first chamber 101. When the reaction is completed, the soil reaction chamber 300 may be removed from the first annular housing 110. Meanwhile, a first reagent inlet and outlet 310 which can be opened and closed is provided in the soil reaction chamber 300. A first PH meter is disposed within the soil reaction chamber 300.

Alternatively, the atmospheric reaction chamber 400 may be provided in a semicircular shell structure, and the top of the atmospheric reaction chamber 400 is open, and when assembled, the atmospheric reaction chamber 400 is detachably connected to the second annular shell 120, and the atmospheric reaction chamber 400 can be embedded in the second assembly hole. And when the atmospheric reaction chamber 400 is located in the second assembly hole, the atmospheric reaction chamber 400 seals the second assembly hole, and the top of the atmospheric reaction chamber 400 communicates with the second chamber 102. When the reaction is completed, the atmospheric reaction chamber 400 may be removed from the second annular housing 120. Meanwhile, a second reagent inlet/outlet 410 is provided in the atmosphere reaction chamber 400 to be openable and closable. A second PH meter is disposed within the atmospheric reaction chamber 400.

The practical use modes of the portable soil respiration measurement device provided in this embodiment may include, for example:

the surface vegetation is cleaned first, the cutting ring 200 is connected to the first end of the first annular shell 110, and then the cutting ring 200 is inserted into the ground from the cleaned surface, and the insertion depth is set as required, for example, the distance between the top of the cutting ring 200 and the surface is ensured to be 2-3 cm. Then, the first sealing ring 150 is arranged in the annular positioning groove, the second sealing ring 160 is adjusted outside the baffle plate, and the baffle plate and the second sealing ring are arrangedThe ring 160 is provided on the stopper ring 170, and then, the second annular housing 120 is screw-fixed with the first annular housing 110 by inserting the third end of the second annular housing 120 into the second end of the first annular housing 110. Next, the top cap 140 is fixed to the fourth end of the second annular housing 120. Finally, the soil reaction chamber 300 may be inserted into the first assembly hole, and the atmospheric reaction chamber 400 may be inserted into the second assembly hole. Thus, the measurement device is assembled, and a test can be performed. In the test, for example, CO may be added to each of the soil reaction chamber 300 and the atmospheric reaction chamber 400 ₂ Absorption liquid: 0.628 to 78.4L of 0.1mol/L NaOH solution; after addition, the first reagent inlet 310 and the second reagent inlet 410 are closed. Readings of the first pH meter 320 and the second pH meter are acquired every 30min-1h, and the measurement is carried out until the soil CO is planned to be measured ₂ The release period is as follows: if the measurement is carried out for a long time, the sufficient amount of CO is required to be added for 12 hours and 24 hours ₂ The absorption liquid or reading PH meter is not lowered any more. CO from soil respiration ₂ The value is the CO absorbed by the absorption liquid in the soil reaction chamber 300 and the absorption liquid in the atmosphere reaction chamber 400 ₂ Is a difference in the amount of (c).

The residual absorption liquid is neutralized and calibrated by using 0.2mol HCL, thus obtaining the measurement of pH concentration and CO release from soil ₂ According to the standard relation of the amount of the soil respiration release CO calculated according to the following calibration curve formula ₂ The amount is in mol:

Y1＝-7562.026246x ₁ ³ +248527.8801x ₁ ² -2722843.831x ₁ +C

Y2＝-7562.026246x ₂ ³ +248527.8801x ₂ ² -2722843.831x ₂ +C

y＝Y1-Y2＝-7562.026246(x ₁ ³ -x ₂ ³ )+248527.8801(x ₁ ² -x ₂ ² )-2722843.831

(x ₁ -x ₂ )

wherein Y1 is CO measured in the soil reaction chamber 300 ₂ The amount of released, Y2, is CO measured in the atmospheric chamber 400 ₂ A release amount; y is CO released by soil respiration ₂ Amount (unit: mol);x ₁ x is the reading of the first pH meter 320 ₂ Is a reading of the second pH meter 420; c is a constant in the range of 9.1 to 9.9X10 ⁶ 。

Calculating CO released by soil respiration per unit time and unit area according to the following formula ₂ Flux in mol.s ^-1 ·m ^-2 ；

C ^Flux ＝y/s/t

C ^Flux CO released by soil respiration per unit time and unit area ₂ Flux in mol.s ^-1 ·m ^-2 S is the area of soil (m) where the ring blade 200 cuts into ² ) T is the time(s) taken by the device to measure soil respiration.

The portable soil respiration measuring device provided by the embodiment has at least the following advantages:

1. the conventional measuring instrument cannot remove CO in the atmospheric environment existing in the measuring air chamber ₂ The device can directly measure CO emitted by soil respiration ₂ ；

2. CO of the prior art ₂ The flux measuring instrument is used for manufacturing CO in the air chamber by the air pump device ₂ The device has a simple structure, does not need electric energy driving, and can be placed in the field for long-term experimental data acquisition;

3. the device has simple structure and operation and portability.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A portable soil respiration measurement device, comprising:

a casing (100), a cutting ring (200), a soil reaction chamber (300) and an atmosphere reaction chamber (400); the machine shell (100) is provided with a first cavity (101) and a second cavity (102) which are mutually independent, the ring cutter (200) is connected with the bottom of the machine shell (100), and the area surrounded by the ring cutter (200) is communicated with the first cavity (101); the soil reaction chamber (300) is arranged in the first chamber (101) and is communicated with the first chamber (101), and the atmosphere reaction chamber (400) is arranged in the second chamber (102) and is communicated with the second chamber (102).

2. The portable soil respiration measurement device of claim 1, wherein:

a first sealing ring (150) is arranged between the cutting ring (200) and the machine shell (100).

3. The portable soil respiration measurement device of claim 2, wherein:

the ring cutter (200) is provided with a first butt joint end, the shell (100) is provided with a second butt joint end, one of the first butt joint end and the second butt joint end is provided with an annular positioning groove, the first butt joint end is spliced with the second butt joint end, and the first sealing ring (150) is positioned in the annular positioning groove.

4. The portable soil respiration measurement device of claim 1, wherein:

the casing (100) comprises a first annular shell (110), a second annular shell (120), a partition plate (130) and a top cover (140), one end of the first annular shell (110) is connected with the ring cutter (200), the other end of the first annular shell (110) is connected with one end of the second annular shell (120), the other end of the second annular shell (120) is connected with the top cover (140), the partition plate (130) is arranged between the first annular shell (110) and the second annular shell (120), the partition plate (130) and the first annular shell (110) are matched to define a first chamber (101), and the partition plate (130) and the second annular shell (120) are matched to define a second chamber (102).

5. The portable soil respiration measurement device of claim 4, wherein:

the soil reaction chamber (300) is detachably connected with the first annular housing (110) to be inserted into the first chamber (101) or to be separated from the first chamber (101).

6. The portable soil respiration measurement device of claim 4, wherein:

the atmospheric reaction chamber (400) is detachably connected with the second annular housing (120) to be inserted into the second chamber (102) or to be separated from the second chamber (102).

7. The portable soil respiration measurement device of claim 4, wherein:

the top cover (140) is arranged as a light shield.

8. The portable soil respiration measurement device of claim 4, wherein:

the second sealing ring (160) is sleeved outside the partition plate (130), and the second sealing ring (160) is simultaneously connected to the first annular shell (110) and the second annular shell (120).

9. The portable soil respiration assay device according to any of claims 4 to 8, wherein:

the first annular shell (110) is in threaded connection with the second annular shell (120).

10. The portable soil respiration measurement device of claim 9, wherein:

an inner wall of the first annular shell (110) is provided with an inner thread and a baffle ring (170), and the baffle ring (170) is positioned at one side of the inner thread, which is close to the cutting ring (200); the baffle plate (130) is arranged on the baffle ring (170); the outer wall of the second annular shell (120) is provided with external threads, the external threads are in threaded connection with the internal threads, and the second annular shell (120) is abutted to the partition plate (130).