An apparatus for simulating in-situ continuous input of root litter

Abstract

The utility model discloses a kind of for simulating root litter in situ sustained input device and its application, through the design of the soil column with stainless steel handle, 1 μm aperture nylon net, the PVC pipe with hole in bottom and multi-generation root litter in situ sustained input simulation system, the dynamic simulation of root litter sustained input process under soil profile scale is realized.The device solves the limitation of traditional decomposition experiment, can dynamically add root litter without destroying soil structure, while effectively blocking exogenous interference, ensuring the accuracy and consistency of experiment.The utility model provides key technical platform for studying the influence of root litter in situ sustained input on soil carbon stability, and is suitable for ecology, carbon cycle research and ecological system management and other fields.

Description

Technical Field

[0001] This utility model relates to the field of ecological research technology, and in particular to a device for simulating in-situ continuous input of root litter. Background Technology

[0002] Root litter refers to the remains of plant roots left in the soil after the plant's roots die. It is a component of plant litter, and its decomposition provides organic carbon and nutrients, making it an important part of soil fertility. The nutrients released during decomposition provide energy for microorganisms, promoting microbial community diversity.

[0003] In ecological research, the decomposition process of root litter has a significant impact on soil carbon cycling. However, traditional decomposition experiments (such as the decomposition bag method) have three major technical drawbacks: 1. The single-addition mode cannot simulate the continuous input process of root litter under natural conditions; 2. The bag method disrupts the soil profile structure and cannot reflect the in-situ decomposition process of litter in natural stratification; 3. It cannot effectively isolate the intrusion of plant roots, mycelium, and external litter, leading to biased experimental data. Utility Model Content

[0004] The technical problems to be solved by this invention are: it is difficult to simulate the input of root litter in a single addition of decomposition experiments; the bagging method destroys the soil profile structure and cannot decompose in situ; and it is difficult to isolate the intrusion of external interferences.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a device for simulating in-situ continuous input of root litter, including a PVC pipe and a support, wherein the support is a ring-shaped metal frame structure coaxially arranged with the PVC pipe, a handle is welded to the top of the support, and several evenly distributed metal ribs are arranged in the vertical direction, a nylon net for receiving soil is fixedly arranged at the top of the metal ribs, a nylon net for shaping the surrounding soil is arranged on the outside of the metal ribs, and the lower end of the metal ribs abuts against the top of the PVC pipe;

[0006] The PVC pipe is a hollow cylinder with multiple bottom holes. The outer wall of the PVC pipe is also fixedly covered with nylon mesh. The inside is filled with soil, which is a solid cylinder. A litter decomposition bag for collecting root litter is placed in the soil.

[0007] As a further improvement of this utility model, both the PVC pipe and the support are placed in a pit.

[0008] As a further improvement of this utility model, the diameter of the pit is at least 12cm, and the pit has a depth of at least 20cm between it and the soil surface.

[0009] As a further improvement of this utility model, the nylon mesh is made of nylon and has a pore size of 1μm, and is fixedly connected to the PVC pipe and the bracket by stainless steel wire.

[0010] As a further improvement of this utility model, the bottom hole is a circular hole with a diameter of 3mm to 5mm, and there are 4 to 10 of them, which are evenly distributed at the bottom of the PVC pipe.

[0011] As a further improvement of this utility model, the litter decomposition bag is a polypropylene woven mesh bag, and the inside is filled with root litter.

[0012] The beneficial effects of this invention are as follows: 1. The device of this invention can realize the dynamic input of root litter without damaging the soil structure, thus solving the error caused by the damage to the soil structure in traditional decomposition experiments.

[0013] 2. The design of nylon mesh with a 1μm aperture effectively blocked interference from exogenous roots, root litter, and mycelia, while ensuring the free passage of soil moisture, thus improving the accuracy and consistency of the experiment.

[0014] 3. This invention is the first to realize the dynamic simulation of the in-situ continuous input process of root litter at the soil profile scale, providing a key technical platform for revealing the influence mechanism of continuous input of root litter on soil carbon stability. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of an in-situ continuous input device for simulating root litter according to the present invention;

[0016] As shown in the figure: 1. Soil; 2. Handle; 3. Support; 4. Nylon mesh; 5. Soil surface; 6. Litter decomposition bag; 7. PVC pipe; 8. Bottom hole. Detailed Implementation

[0017] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0018] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] This utility model provides the following: Figure 1 As shown, a device for simulating in-situ continuous input of root litter includes a PVC pipe 7 and a support 3.

[0021] The support 3 is a ring-shaped metal frame structure coaxially mounted with the PVC pipe 7. A handle 2 is welded to the top of the support 3. Several evenly distributed metal ribs are arranged vertically, and a nylon mesh 4, made of nylon with a 1μm pore size, is fixedly attached to the top of each rib to receive soil 1. This mesh is used to prevent interference from external roots and mycelia. The nylon mesh 4 is fixedly connected to the PVC pipe 7 and the support 3 using stainless steel clamps to ensure structural stability. The lower end of the metal ribs abuts against the top of the PVC pipe 7; this abutment allows the surface soil 1 to be removed without damaging the soil structure, facilitating the periodic addition of root litter. Nylon mesh 4 is also installed on the outer side of the metal ribs to block the invasion of external roots, root litter, and mycelia, while ensuring free water flow.

[0022] The PVC pipe 7 is a hollow cylinder with multiple bottom holes 8. These holes are circular, 3mm-5mm in diameter, and there are 4-10 holes evenly distributed at the bottom of the PVC pipe 7. This allows water to freely enter and exit. The openings are sealed with nylon mesh 4 with a 1μm pore size to ensure the accuracy and consistency of the experiment. The outer wall of the PVC pipe 7 is also fixedly covered with nylon mesh 4, and the interior is filled with soil 1. The soil 1 is a solid cylinder, and a litter decomposition bag 6 containing root litter is placed within the soil 1. The litter decomposition bag 6 is a polypropylene woven mesh bag filled with root litter; it is used to simulate the experimental process of litter. Both the PVC pipe 7 and the support 3 are placed in a pit to simulate the actual working environment. The pit has a diameter of at least 12cm, and the depth between the pit and the soil surface 5 is at least 20cm; this provides a suitable experimental environment.

[0023] Working principle: In the specific implementation of this invention, before the experiment, the PVC pipe 7 is buried in a field pit, and the bottom hole 8 is sealed with a nylon mesh 4 with a pore size of 1μm to ensure that water can freely enter and exit while blocking interference from external impurities. The outer wall of the PVC pipe 7 is also covered with nylon mesh 4, and the inside is filled with soil 1 with a natural structure to form a solid soil column structure; a litter decomposition bag 6 is set in the middle of the soil column. The bag body is made of polypropylene woven mesh and is used to hold the root litter used in the experiment.

[0024] The support 3 is a ring-shaped metal frame coaxially mounted with the PVC pipe 7. Multiple metal ribs are arranged vertically, with the tops of the ribs welded to support the nylon mesh 4, which in turn supports the soil 1 to form a stable structure. A stainless steel handle 2 is located at the top of the support 3, fixedly connected to the top of the soil 1, allowing the entire soil column to be lifted as a whole. This facilitates the removal of the topsoil every 8 months during the experiment, allowing for the addition of fresh litter decomposition bags 6, thus achieving a dynamic and continuous input of root litter. The lower ends of the metal ribs abut against the top of the PVC pipe 7, ensuring support stability and facilitating the removal of the soil column.

[0025] The apparatus is set in a pit with a diameter of at least 12 cm and a depth of at least 20 cm to provide an experimental foundation close to a natural soil environment. The entire periphery of the structure, including the support frame 3 and the inner wall of the pit, is covered with nylon mesh 4 with a pore size of 1 μm. This effectively blocks the intrusion and interference of exogenous roots, mycelium, and other root litter, while ensuring the free exchange of moisture and gas within the system. Through this structural setup, the apparatus can periodically replace and replenish root litter in the litter decomposition bag 6 without damaging the original structure of the soil 1. This simulates the multi-generational continuous input process of root litter under natural conditions, effectively overcoming the problems of single input, profile destruction, and exogenous interference in traditional decomposition experiments. It provides a precise and reliable experimental platform for studying the impact of root litter on soil carbon cycling and microecological processes.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for simulating in-situ continuous input of root litter, comprising a PVC pipe (7) and a support (3), characterized in that: The bracket (3) is a ring-shaped metal frame structure coaxially arranged with the PVC pipe (7). The bracket (3) has a handle (2) welded to the top and several evenly distributed metal ribs arranged in the vertical direction. The top of the metal ribs is fixedly provided with a nylon net (4) to support the soil (1). The outside of the metal ribs is provided with a nylon net (4) for shaping the surrounding soil (1). The lower end of the metal ribs abuts against the top of the PVC pipe (7). The PVC pipe (7) is a hollow cylinder with multiple bottom holes (8). The outer wall of the PVC pipe (7) is also fixedly covered with nylon mesh (4), and the inside is filled with soil (1). The soil (1) inside is a solid cylinder, and a litter decomposition bag (6) for holding root litter is placed in the soil (1).

2. The device for simulating in-situ continuous input of root litter according to claim 1, characterized in that: Both the PVC pipe (7) and the support (3) are placed in the pit.

3. The device for simulating in-situ continuous input of root litter according to claim 2, characterized in that: The pit has a diameter of at least 12 cm and a depth of at least 20 cm between the pit and the soil surface (5).

4. The device for simulating in-situ continuous input of root litter according to claim 1, characterized in that: The nylon mesh (4) is made of nylon and has a pore size of 1μm. It is fixedly connected to the PVC pipe (7) and the bracket (3) by stainless steel wire.

5. A device for simulating in-situ continuous input of root litter according to claim 1, characterized in that: The bottom hole (8) is a circular hole with a diameter of 3mm to 5mm, and there are 4 to 10 of them, which are evenly distributed at the bottom of the PVC pipe (7).

6. A device for simulating in-situ continuous input of root litter according to claim 1, characterized in that: The litter decomposition bag (6) is a polypropylene woven mesh bag, and the inside is filled with root litter.

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