Field in-situ litter decomposition ring combined with illumination treatment

Abstract

The invention relates to a field in-situ litter decomposition ring combined with light treatment, and aims to solve the technical problem of single function of the existing field litter decomposition test device. The technical scheme is 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 functions of the decomposition ring and the ring cover are integrated, 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 invention belongs to the technical field of litter decomposition experimental equipment, and in particular 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 pool, and its contribution to soil carbon pool is an important factor affecting soil carbon storage. Solar radiation causes photodegradation of litter, which plays an important role in litter carbon transformation. Photodegradation caused by full-band solar radiation can be coupled with microbial degradation process, which has an important impact on litter decomposition and carbon turnover in various ecosystems. However, few studies have focused on the fate of litter carbon after accelerated litter decomposition caused by photodegradation, especially the transformation and stabilization of litter carbon in soil.

[0003] Previous designs of litter decomposition rings were mainly used for litter decomposition experiments. The design goal of decomposition rings is to prevent litter loss and damage from wild animals or grazing livestock. Therefore, chambers are often designed higher than the ground. These components may shade the ground inside the decomposition ring, thereby interfering with light treatment and are not suitable for litter photodegradation research. In addition, some 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 decomposition rings divide the inside and outside of the ring into independent spaces, which may cause differences between the environment inside the ring and the field environment outside the ring. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problem. In order to be suitable for studying how solar radiation affects the contribution of litter carbon to the soil carbon pool, a device specially used for in situ tracking of the fate of litter carbon is designed and invented. The light treatment and the litter decomposition cycle are combined 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, comprising an outer cylinder, a plurality of isolation nets, a fixing frame, a ring cover and a light filter film;

[0007] The fixing frame comprises 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 comprises a ring cover plug-in portion and a fixing portion, wherein the fixing portion is fixedly arranged on the upper portion of the inner side wall of the ring cover plug-in portion, a card 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 card 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 part 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 a ring cover plug-in part, the top surface of the lower ring cover is evenly provided with a plurality of conical holes, 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 snaps arranged 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 present invention has the following beneficial effects:

[0019] 1. The present invention combines the in-situ decomposition tracking device and the light regulation processing device through the split design of the decomposition ring and the ring cover, realizes the integration of the functions of the two, and can realize the in-situ study of the influence of solar radiation on the transfer of litter carbon to the soil carbon pool;

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

[0021] 3. The ring cover of the present invention is provided with a slot to facilitate the replacement of 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 Embodiment 1 of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the fixing frame of the present invention;

[0024] Figure 3 Schematic diagram of the cross-sectional structure of the ring cover of Example 1 of the present invention;

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

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

[0027] Figure 6 Schematic diagram of the cross-sectional structure of the ring cover of Example 2 of the present invention;

[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 part; 4.2, slot; 4.3, fixing part; 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 in conjunction with 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 being corroded and damaged, and prolong the service life, and also includes a plurality of nylon isolation nets 2 with an aperture of 0.15 mm and a filter film 5;

[0036] 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, wherein the upper fixing ring 3.3 is connected to the lower fixing ring 3.1 via a plurality of supporting columns 3.2;

[0037] The ring cover 4 comprises a ring cover plug-in portion 4.1 and a fixing portion 4.3, wherein 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, and a card slot 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, and the filter film 5 covers the bottom surface of the fixing portion 4.3, and 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 card slot 4.2;

[0038] A plurality of exchange holes 1.1 are evenly provided in the middle of the side wall of the outer cylinder 1 to promote water exchange inside and outside the ring so that the water inside and outside the ring remain 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 with the internal tracking target litter carbon transfer; the fixed 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 fixed frame 3 are plugged into the ring cover plug-in part 4.1, and the lower ends of the outer cylinder 1 and the fixed frame 3 are wedge-shaped tips 3.4.

[0039] The outer cylinder 1 and the upper end of the fixing frame 3 are plugged into the annular groove 4.2, and the thickness w1 of the outer cylinder 1 + the upper fixing ring 3.3 is equal to the width w2 of the groove 4.2, so that the filter film 5 is fixed and convenient for replacement at any time. A plurality of vent holes 5.1 with an interval of 1 cm and an aperture of 2 mm are opened on the filter film 5 to allow moisture, air and microorganisms to enter the decomposition ring. The inner diameter of the ring cover plug-in part 4.1 is equal to the outer diameter of the outer cylinder 1, and the distance h2 from the bottom of the groove of the groove 4.2 to the lower end of the ring cover plug-in part 4.1 is equal to the height h1 of the soil leaking part of the outer cylinder 1.

[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 comprises 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 are 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 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 is connected to the upper ring cover 4.5 by a plurality of buckles 4.7 provided on the outer side wall.

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

[0046] The working process of the present invention is as follows:

[0047] When using Example 1, in the soil of the area to be studied, the height of the outer cylinder 1 according to the present invention is reduced by h1. Take a drill soil, dig a test hole, put the present invention into the hole, and insert the wedge-shaped tip 3.4 into the soil conveniently, 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 put the isolation net 2 and the fixing frame 3 into 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. Let it stand for a period of time to restore it to its original state as much as possible, and remove the plants in the ring regularly during this period; at the beginning of the decomposition test, place the litter on the soil surface in the outer cylinder 1, and then cover the filter film 5 on the ring cover plug-in part 4.1, and place the edge of the filter film 5 in the card slot 4.2. The ring cover 4 covers the upper end of the outer cylinder 1 and the fixing frame 3, so that it is inserted into the card slot 4.2. When the filter film 5 is fixed, the device of the present invention 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 content inside and outside the ring is kept consistent. The isolation net 2 allows microorganisms to exchange but plant roots cannot pass through, thereby isolating the interference of external plant bodies with the internal tracking target litter carbon transfer. Solar radiation from the upper end of the device enters the device through the filter film 5, while allowing water, air and microorganisms to enter the decomposition ring. The present invention 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 study 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, and insert the ring cover plug-in part 4.1 of the fixed ring cover 4 into the outer tube 1 and the upper end of the fixing frame 3. The rest is the same as Example 1, and the test is started.

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 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 groove (4.2); A plurality of exchange holes (1.1) are evenly arranged 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); the thickness w1 of the outer cylinder (1) + the upper fixing ring (3.3) is equal to the width w2 of the groove (4.2); and 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 soil leaking portion of the outer cylinder (1).

2. 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) arranged on the outer wall.

3. A field in-situ litter decomposition loop combined with light treatment according to claim 1 or 2, characterized in that: The lower ends of the outer cylinder (1) and the fixing frame (3) are wedge-shaped tips (3.4).

4. The field in-situ litter decomposition loop combined with light treatment according to claim 3, 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).

5. The field in-situ litter decomposition loop combined with light treatment according to claim 3, 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.

6. The field in-situ litter decomposition loop combined with light treatment according to claim 3, characterized in that: The average pore size of the isolation net (2) is 0.01-5 mm.

7. The field in-situ litter decomposition loop combined with light treatment according to claim 3, 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.

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