Field in-situ litter decomposition ring combined with illumination treatment

Abstract

The utility model relates to a field in-situ litter decomposition ring combined with light treatment, which aims to solve the technical problem of single function of the existing field litter decomposition test device, and adopts the technical scheme that the field in-situ litter decomposition ring comprises an outer cylinder, a separation net, a fixed frame, a ring cover and a filter film, an exchange hole is formed in the upper portion of the outer barrel, the separation net is placed in the outer barrel to cover the exchange hole and the bottom of the fixing frame, the fixing frame comprises a lower fixing ring, an upper fixing ring and a supporting column, the upper fixing ring is connected with the lower fixing ring through the supporting column, and the fixing frame is placed in the separation net to serve as a support. The ring cover comprises a ring cover inserting part and a fixing part, a clamping groove is formed in the bottom of the joint of the ring cover inserting part and the fixing part, the filter film covers the bottom face of the fixing part, and the outer cylinder and the upper end of the fixing frame are inserted into the clamping groove. Through the split design of the decomposition ring and the ring cover and the combination of the in-situ decomposition tracking device and the illumination adjusting treatment device, the in-situ decomposition tracking device and the illumination adjusting treatment device are integrated in function, and the research on the influence of solar radiation on the transfer of litter carbon to the soil carbon library can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of litter decomposition experimental equipment, and particularly relates to a field in-situ litter decomposition ring combined with light treatment. Background Art

[0002] Litter carbon input is one of the main initial sources of soil carbon, and its contribution to soil carbon storage is a key factor influencing soil carbon storage. Solar radiation-induced photodegradation of litter plays a crucial role in litter carbon transformation. Photodegradation, driven by full-spectrum solar radiation, can couple with microbial degradation processes, significantly influencing litter decomposition and carbon turnover in various ecosystems. However, few studies have focused on the fate of litter carbon after photodegradation accelerates litter decomposition, particularly the transformation and stabilization of litter carbon in soil.

[0003] Previous studies have primarily designed litter decomposition rings for litter decomposition experiments. These rings are often designed to prevent litter loss and damage from wildlife or grazing livestock. Consequently, these rings often feature elevated chambers. These components can shade the ground within the rings, interfering with light treatment and making them unsuitable for litter photodegradation studies. Additionally, previous studies have tracked the transformation and stabilization of litter in soil in situ under field conditions and designed corresponding in situ decomposition rings. However, these rings separate the inner and outer rings into separate compartments, potentially creating differences between the inner and outer ring environments. Utility Model Content

[0004] The purpose of the present invention is to solve the above-mentioned problems. In order to be suitable for studying how solar radiation affects the contribution of litter carbon to the soil carbon pool, a device specifically for in-situ tracking of the fate of litter carbon is designed and invented. The device combines light treatment and litter decomposition cycle to track the transformation and stabilization of litter carbon in the soil under photodegradation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A field in-situ litter decomposition ring combined with light treatment comprises an outer cylinder, a plurality of isolation nets, a fixing frame, a ring cover and a filter film;

[0007] The fixing frame includes a lower fixing ring, an upper fixing ring and a plurality of supporting columns, wherein the upper fixing ring is connected to the lower fixing ring through the plurality of supporting columns;

[0008] The ring cover includes a ring cover plug-in portion and a fixing portion. The fixing portion is fixed to the upper portion of the inner side wall of the ring cover plug-in portion. A slot is provided at the bottom of the connection between the fixing portion and the ring cover plug-in portion. The filter film covers the bottom surface of the fixing portion, and the diameter of the filter film is larger than the diameter of the fixing portion, and the edge of the filter film is located in the annular slot.

[0009] A plurality of exchange holes are evenly opened in the middle of the side wall of the outer cylinder, and the plurality of isolation nets are respectively arranged on the inner side wall and the bottom of the outer cylinder to cover the exchange holes and the bottom of the outer cylinder. The fixing frame is arranged in the outer cylinder to support the isolation net. The upper ends of the outer cylinder and the fixing frame are plugged into the ring cover plug-in portion and inserted into the annular groove.

[0010] Furthermore, the thickness w1 of the outer cylinder + the upper fixing ring is equal to the width w2 of the slot.

[0011] Furthermore, the distance h2 from the bottom of the groove of the clamping slot to the lower end of the ring cover plug-in portion is equal to the height h1 of the portion of the outer cylinder that leaks out of the soil.

[0012] Furthermore, the ring cover includes a lower ring cover and an upper ring cover, the lower ring cover and the upper ring have the same diameter, the lower part of the lower ring cover is the ring cover plug-in part, the top surface of the lower ring cover is evenly provided with a plurality of conical holes, and the bottom surface of the upper ring cover is provided with a plurality of conical protrusions at corresponding positions, the filter film is laid between the lower ring cover and the upper ring cover, and the conical protrusions pass through the edge of the filter film and are inserted into the conical holes, and the lower ring cover and the upper ring cover are connected by a plurality of snap fasteners provided on the outer wall.

[0013] Furthermore, the lower ends of the outer cylinder and the fixing frame are wedge-shaped tips.

[0014] Furthermore, the inner diameter of the ring cover plug-in portion is equal to the outer diameter of the outer cylinder.

[0015] Furthermore, a plurality of ventilation holes are evenly arranged on the filter film, the spacing between the ventilation holes is 1 cm, and the average pore size is 1-3 mm.

[0016] Furthermore, the average pore size of the isolation net is 0.01-5 mm.

[0017] Furthermore, the outer cylinder, the fixing frame and the ring cover are all made of PVC material, and the isolation net is made of nylon net material.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This utility model combines the in-situ decomposition tracking device with the light regulation processing device through the split design of the decomposition ring and the ring cover, realizing the integration of the two functions, and can realize the in-situ study of the effect of solar radiation on the transfer of litter carbon to the soil carbon pool;

[0020] 2. The utility model increases the connection between the decomposition ring and the outside through the exchange hole, and isolates the interference of external plants on the carbon transfer of the internal tracking target litter through the isolation net, so that other microenvironmental indicators are not affected except for the solar radiation of the target;

[0021] 3. The utility model has a card slot on the ring cover, which is convenient for replacing the filter film, has a simple structure and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present utility model;

[0023] Figure 2 This is a schematic diagram of the fixing frame structure of the utility model;

[0024] Figure 3 This is a schematic cross-sectional view of the ring cover of Example 1 of the present utility model;

[0025] Figure 4 This is a schematic diagram of the overall cross-sectional structure of Example 1 of the present utility model;

[0026] Figure 5 This is a schematic diagram of the ring cover structure of Example 2 of the present utility model;

[0027] Figure 6 This is a schematic cross-sectional view of the ring cover of Example 2 of the present utility model;

[0028] In the figure: 1, outer cylinder; 2, isolation net; 3, fixing frame; 4, ring cover; 5, filter film;

[0029] 1.1, exchange hole;

[0030] 3.1. Lower fixing ring; 3.2. Support column; 3.3. Upper fixing ring; 3.4. Wedge-shaped tip;

[0031] 4.1. Ring cover plug-in portion; 4.2. Slot; 4.3. Fixing portion; 4.4. Lower ring cover; 4.5. Upper ring cover; 4.6. Conical protrusion; 4.7. Buckle;

[0032] 5.1. Ventilation hole. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] like Figure 1-4 As shown, a field in-situ litter decomposition ring combined with light treatment includes an outer cylinder 1, a fixing frame 3 and a ring cover 4, which can effectively prevent the decomposition ring from corrosion and damage and extend its service life. It also includes several nylon isolation nets 2 with an aperture of 0.15 mm and filter films 5;

[0036] The fixing frame 3 includes a lower fixing ring 3.1, an upper fixing ring 3.3 and a plurality of support columns 3.2. The upper fixing ring 3.3 is connected to the lower fixing ring 3.1 through the plurality of support columns 3.2.

[0037] The ring cover 4 includes a ring cover plug-in portion 4.1 and a fixing portion 4.3. The fixing portion 4.3 is fixed to the upper inner side wall of the ring cover plug-in portion 4.1. A groove 4.2 is formed at the bottom of the connection between the fixing portion 4.3 and the ring cover plug-in portion 4.1. The filter film 5 covers the bottom surface of the fixing portion 4.3. The diameter of the filter film 5 is larger than that of the fixing portion 4.3, and the edge of the filter film 5 is located in the annular groove 4.2.

[0038] A plurality of exchange holes 1.1 are evenly opened in the middle of the side wall of the outer cylinder 1 to promote water exchange between the inside and outside of the ring so that the water content inside and outside the ring is kept consistent. The exchange holes 1.1 and the lower fixed ring 3.1 are covered by a nylon isolation net 2 with an average pore size of 0.15 mm, so that microorganisms can pass through but roots cannot, thereby isolating the interference of external plant bodies on the internal tracking target litter carbon transfer; the fixing frame 3 is arranged in the outer cylinder 1 to support the isolation net 2, the upper ends of the outer cylinder 1 and the fixing frame 3 are plugged into the ring cover plug-in part 4.1, and the lower ends of the outer cylinder 1 and the fixing frame 3 are wedge-shaped tips 3.4.

[0039] The outer cylinder 1 and the upper end of the fixing frame 3 are inserted into the annular groove 4.2. The thickness w1 of the outer cylinder 1 plus the upper fixing ring 3.3 is equal to the width w2 of the groove 4.2, which secures the filter membrane 5 and facilitates its replacement at any time. The filter membrane 5 is provided with a plurality of vent holes 5.1 with an aperture of 2 mm and a spacing of 1 cm to allow moisture, air, and microorganisms to enter the decomposition ring. The inner diameter of the ring cover plug-in portion 4.1 is equal to the outer diameter of the outer cylinder 1. The distance h2 from the bottom of the groove of the groove 4.2 to the lower end of the ring cover plug-in portion 4.1 is equal to the height h1 of the portion of the outer cylinder 1 that leaks out of the soil.

[0040] The average pore diameter of the vent holes 5.1 can also be any value between 1-3 mm;

[0041] The average pore size of the isolation net 2 can also be any value between 0.01-5 mm.

[0042] Example 2

[0043] The difference between this embodiment and embodiment 1 is that:

[0044] The ring cover 4 includes a lower ring cover 4.4 and an upper ring cover 4.5. The diameters of the lower ring cover 4.4 and the upper ring cover 4.5 are the same and the same as the outer diameter of the outer cylinder 1. The lower part of the lower ring cover 4.4 is a ring cover plug-in portion 4.1. The top surface of the lower ring cover 4.4 is evenly provided with a plurality of tapered holes. The bottom surface of the upper ring cover 4.5 is provided with a plurality of tapered protrusions 4.6 at corresponding positions. The filter film 5 is laid between the lower ring cover 4.4 and the upper ring cover 4.5, and the tapered protrusions 4.6 pass through the edges of the filter film 5 and are inserted into the tapered holes. The lower ring cover 4.4 and the upper ring cover 4.5 are connected by a plurality of buckles 4.7 provided on the outer side walls.

[0045] The other structures are the same as those in Example 1.

[0046] The working process of this utility model is as follows:

[0047] When using Example 1, in the soil of the area to be studied, the height of the outer cylinder 1 of the utility model should be subtracted from the size h1, a drill soil is taken, a test hole is dug, and the utility model is placed in the hole. The wedge-shaped tip 3.4 is conveniently inserted into the soil, so that the height h1 of the outer cylinder 1 above the ground surface is the same as the height of the ring cover 4.1, and the isolation net 2 and the fixing frame 3 are placed in the outer cylinder 1 in sequence. The taken-out soil is processed according to the test requirements, such as sieving to remove plant parts and stones, and then backfilled into the installed outer cylinder 1. It is left to stand for a period of time to allow it to recover to its original state as much as possible, and the plants in the ring are regularly removed during this period; at the beginning of the decomposition test, litter is placed on the soil surface in the outer cylinder 1, and then the filter film 5 is covered on the ring cover plug-in part 4.1, and the edge of the filter film 5 is placed in the card slot 4.2. The ring cover 4 covers the outer cylinder 1 and the upper end of the fixing frame 3, so that it is inserted into the card slot 4.2. When the filter film 5 is fixed, the utility model device is also installed and starts to decompose;

[0048] While litter is decomposing in the outer cylinder 1, water is exchanged inside and outside the outer cylinder 1 through the exchange hole 1.1, so that the water inside and outside the ring remains consistent. The isolation net 2 allows microorganisms to exchange but plant roots cannot pass through, isolating the interference of external plant bodies on the internal tracking target litter carbon transfer. Solar radiation from the upper end of the device enters the interior of the device through the filter film 5, while allowing water, air and microorganisms to enter the decomposition ring. The utility model combines the in-situ decomposition tracking device with the light regulation and processing device to achieve the integration of the two functions, and realizes the in-situ exploration of the influence of solar radiation on the transfer of litter carbon to the soil carbon pool.

[0049] When using Example 2, first open the buckle 4.7, remove the upper ring cover 4.5 from the lower ring cover 4.4, lay the filter film 5 on the top surface of the lower ring cover 4.4, cover the upper ring cover 4.5 on the filter film 5, and insert the conical protrusion 4.6 through the edge of the filter film 5 into the conical hole. Then close the external buckle 4.7 to fix the lower ring cover 4.4 and the upper ring cover 4.5 together. Insert the ring cover plug-in portion 4.1 of the fixed ring cover 4 into the outer cylinder 1 and the upper end of the fixing frame 3. The rest is the same as Example 1, and start the test.

Claims

1. A field in-situ litter decomposition cycle combined with light treatment, characterized in that: It comprises an outer cylinder (1), a plurality of isolation nets (2), a fixing frame (3), a ring cover (4) and a filter film (5); The fixing frame (3) comprises a lower fixing ring (3.1), an upper fixing ring (3.3) and a plurality of supporting columns (3.2); the upper fixing ring (3.3) is connected to the lower fixing ring (3.1) via the plurality of supporting columns (3.2); The ring cover (4) comprises a ring cover plug-in portion (4.1) and a fixing portion (4.3); the fixing portion (4.3) is fixedly arranged on the upper portion of the inner side wall of the ring cover plug-in portion (4.1); a clamping groove (4.2) is provided at the bottom of the connection between the fixing portion (4.3) and the ring cover plug-in portion (4.1); the filter film (5) covers the bottom surface of the fixing portion (4.3); the diameter of the filter film (5) is larger than the diameter of the fixing portion (4.3), and the edge of the filter film (5) is located in the annular clamping groove (4.2); A plurality of exchange holes (1.1) are evenly formed in the middle of the side wall of the outer cylinder (1); the plurality of isolation nets (2) are respectively arranged on the inner side wall and the bottom of the outer cylinder (1) to cover the exchange holes (1.1) and the bottom of the outer cylinder (1); the fixing frame (3) is arranged in the outer cylinder (1) to support the isolation net (2); the upper ends of the outer cylinder (1) and the fixing frame (3) are plugged into the ring cover plug-in portion (4.1) and inserted into the annular groove (4.2).

2. The field in-situ litter decomposition loop combined with light treatment according to claim 1, characterized in that: The thickness w1 of the outer cylinder (1) + the upper fixing ring (3.3) is equal to the width w2 of the clamping groove (4.2).

3. The field in-situ litter decomposition loop combined with light treatment according to claim 1, characterized in that: The distance h2 from the bottom of the groove of the clamping groove (4.2) to the lower end of the ring cover plug-in portion (4.1) is equal to the height h1 of the portion of the outer cylinder (1) that leaks out of the soil.

4. The field in-situ litter decomposition loop combined with light treatment according to claim 1, characterized in that: The ring cover (4) comprises a lower ring cover (4.4) and an upper ring cover (4.5). The lower ring cover (4.4) and the upper ring cover (4.5) have the same diameter. The lower part of the lower ring cover (4.4) is a ring cover plug-in part (4.1). The top surface of the lower ring cover (4.4) is evenly provided with a plurality of conical holes. The bottom surface of the upper ring cover (4.5) is provided with a plurality of conical protrusions (4.6) at corresponding positions. The filter film (5) is laid between the lower ring cover (4.4) and the upper ring cover (4.5), and the conical protrusions (4.6) pass through the edge of the filter film (5) and are inserted into the conical holes. The lower ring cover (4.4) and the upper ring cover (4.5) are connected by a plurality of buckles (4.7) provided on the outer wall.

5. The field in-situ litter decomposition loop combined with light treatment according to claim 1 or 4, characterized in that: The lower ends of the outer cylinder (1) and the fixing frame (3) are wedge-shaped tips (3.4).

6. The field in-situ litter decomposition loop combined with light treatment according to claim 5, characterized in that: The inner diameter of the ring cover plug-in portion (4.1) is equal to the outer diameter of the outer cylinder (1).

7. The field in-situ litter decomposition loop combined with light treatment according to claim 5, characterized in that: A plurality of ventilation holes (5.1) are evenly arranged on the filter film (5), the spacing between the ventilation holes (5.1) is 1 cm, and the average pore diameter is 1-3 mm.

8. The field in-situ litter decomposition loop combined with light treatment according to claim 5, characterized in that: The average pore size of the isolation net (2) is 0.01-5 mm.

9. The field in-situ litter decomposition loop combined with light treatment according to claim 5, characterized in that: The outer cylinder (1), the fixing frame (3) and the ring cover (4) are all made of PVC material, and the isolation net (2) is made of nylon net material.

Images