Method for effectively removing spartina alterniflora

Abstract

According to the method for effectively removing the spartina alterniflora, deep digging and layered inverted burying are conducted on the spartina alterniflora in a treatment area, it is ensured that overground parts and shallow surface plants are all integrally inverted and buried in soil which is 140 cm or below away from the ground, the plants are isolated from light and air, and the effect of removing the spartina alterniflora is achieved. Then the underground part is integrally inversely buried above the inversely buried overground part, the overground part is thoroughly covered, deep isolation is ensured, the regeneration capacity of the overground part is fundamentally blocked, and thorough deep digging and layered inversely buried burying of the spartina alterniflora in the whole treatment area are sequentially and progressively completed. The method does not need to use chemical agents, is environmentally friendly, easy and convenient to operate, high in durability and suitable for ecological management of large-area beach wetlands, effectively restrains rejuvenation of spartina alterniflora and maintains ecological balance.

Description

Technical Field

[0001] The present invention belongs to the technical field of ecological environment governance, and specifically relates to a method for effectively removing Spartina alterniflora. Background Art

[0002] Spartina alterniflora is a perennial salt marsh plant native to North America, with extremely strong ecological adaptability and usually grows in intertidal wetlands. This plant was introduced to the coastal areas of China in the early 1980s, initially used to enhance the stability of tidal flats, prevent wind and waves, and promote siltation and land formation. However, Spartina alterniflora shows extremely strong invasiveness in the new ecological environment, rapidly spreads through asexual reproduction and seed dispersal, and gradually forms large single communities, seriously threatening the ecological balance of coastal wetlands and local biodiversity. The spread of Spartina alterniflora has become one of the issues of global concern regarding alien species invasion.

[0003] The invasion of Spartina alterniflora has caused a series of negative impacts on the coastal wetland ecosystem. Firstly, Spartina alterniflora inhibits the growth of native plants and changes the plant community structure of the wetland. Secondly, the lush root system of Spartina alterniflora accelerates sediment deposition and changes the natural landform of the tidal flat, which poses pressure on organisms such as fish, shellfish, and birds that rely on tidal flats for habitat loss or migration. In addition, the dense plants of Spartina alterniflora often hinder water exchange, affect the water quality and nutrient cycling in the intertidal zone, and further degrade the ecological functions of the wetland.

[0004] Currently, the control of Spartina alterniflora mainly relies on physical, chemical, and biological control methods. However, these methods have limitations in terms of in-depth treatment, environmental impact, and control effect: Physical control usually includes methods such as mechanical cutting, manual uprooting, and plowing. However, these methods are mostly limited to the treatment of the above-ground part and it is difficult to completely remove the root system of Spartina alterniflora, especially the rhizomes distributed in the deep soil. The traditional plowing method is mainly used to turn the surface soil to a depth of about 1 meter. Although it can damage the shallow roots of Spartina alterniflora to a certain extent, due to insufficient depth, it often cannot reach the entire growth layer of its roots, resulting in an incomplete control effect. Especially in areas where the rhizomes of Spartina alterniflora are deeper or the substrate is softer, the limitation of the plowing depth causes the rhizomes to remain in the soil and then quickly regenerate. This plowing treatment has a worse effect in tidal flat areas with greater tidal influence. Due to the driving of water flow, the rhizomes often re-colonize after treatment, and the recurrence rate is relatively high. In addition, plowing operations usually consume a large amount of human and material resources, with high costs and it is difficult to achieve long-term effects. Therefore, the existing plowing methods have significant deficiencies in terms of depth, cost, and effect.

[0005] Chemical control mainly uses herbicide spraying to inhibit the growth of Spartina alterniflora. However, herbicides mainly act on the above-ground parts of plants and have limited damage to the deep roots, so it is impossible to achieve complete eradication. In addition, the use of herbicides may cause soil and water pollution, affect surrounding non-target plants and aquatic organisms, and bring ecological safety problems. Long-term use of chemical herbicides may also lead to the development of drug resistance, further weakening the control effect. Due to the special nature of the intertidal zone environment, the application of chemical control has greater environmental risks. Biological control attempts to introduce natural enemies or specific pathogens of Spartina alterniflora to inhibit its growth. However, due to the possible uncontrollable ecological impacts of the introduction of natural enemies or pathogens on native species, its application risks are relatively high.

[0006] In summary, the existing methods for controlling Spartina alterniflora have obvious deficiencies in terms of control depth and environmental impact. Especially the plowing method in physical control, its depth is not enough to completely destroy the rhizome system of Spartina alterniflora, resulting in a high recurrence rate after treatment. Under the limitation of a depth of 1 meter, the plowing method is difficult to reach all the distribution layers of the roots of Spartina alterniflora. Especially in areas greatly affected by tides, the rhizomes are extremely easy to germinate again. Therefore, there is an urgent need for a more effective method for controlling Spartina alterniflora to completely block its regeneration ability, so as to achieve long-term and effective control effects. Summary of the Invention

[0007] To solve the above problems, the present invention provides a method for effectively removing Spartina alterniflora, which adopts a deeper physical control method. By deeply excavating and inversely burying Spartina alterniflora in layers in the treatment area, it is ensured that the whole above-ground part and the shallow-surface plants are inversely buried in the soil more than 140 cm below the ground surface, so as to isolate them from light and air. Then, the whole underground part is inversely buried above the inversely buried above-ground part to completely cover the above-ground part, ensuring deep isolation, fundamentally blocking its regeneration ability, and successively and progressively completing the thorough deep excavation and layered inverse burial of Spartina alterniflora in the entire treatment area. This method does not require the use of chemical agents, is environmentally friendly, easy to operate, and has strong persistence. It is suitable for the ecological control of large-area tidal flats and wetlands, effectively curbing the regrowth of Spartina alterniflora and maintaining ecological balance.

[0008] On the one hand, the present invention provides a method for removing Spartina alterniflora, which is to dig out all the plants and rhizomes of Spartina alterniflora and inversely bury them as a whole in the soil.

[0009] The overall inverse burial described in the present invention means that all the plants (including rhizomes) of Spartina alterniflora that originally grew upward are integrally flipped, rotated 180 degrees, so that all the plants (including rhizomes) that originally grew upward are turned into downward as a whole and buried in the soil. At this time, the original top part will be at the deepest part of the soil, completely isolating light and air.

[0010] Although in the prior art, Spartina alterniflora is also removed by tillage, it is not usually turned upside down as a whole. Instead, it is simply tilled, which cannot ensure that the stems and leaves originally facing upward are all turned downward as a whole. Especially in the wet tidal flats, although they are buried, if they are not turned upside down as a whole, the stems and leaves still facing upward in the soil will still have the possibility of continued growth once they encounter air or water, which will affect the removal effect of Spartina alterniflora. Therefore, turning upside down and burying as a whole is a necessary condition for blocking the regeneration of Spartina alterniflora.

[0011] Furthermore, all plants and rhizomes of Spartina alterniflora need to be divided into two layers and buried upside down in layers; the first layer includes the rhizomes in the shallow surface soil and the plants above the soil; the second layer includes the rhizomes in the deep soil.

[0012] The plants of Spartina alterniflora above the soil have tough and erect stems, the stem nodes have leaf sheaths, there are axillary buds in the leaf axils, the leaves are alternate, and are long lanceolate; the rhizomes in the shallow surface soil are long and thick underground stems (rhizomes), with developed root systems, often densely distributed in the soil layer 40 cm deep underground, and have strong reproductive ability; the fine fibrous roots that are short and thin are distributed in the deep soil, and the fibrous roots do not have reproductive ability.

[0013] It can be seen that the parts of Spartina alterniflora that can reproduce include the plants growing above the ground and the rhizomes growing in the shallow surface soil (within about 40 cm deep underground). Therefore, during the process of turning upside down and burying, first of all, it is necessary to deeply turn upside down and bury these parts with strong reproductive ability to ensure complete isolation from light and air. After dealing with the rhizomes in the shallow surface soil and the plants above the soil with strong reproductive ability, for the remaining fibrous roots in the deep soil, although they do not have reproductive ability, they also need to be completely dug out and buried upside down to ensure absolute safety. Because there may be a very small amount of rhizomes remaining in the fibrous roots, especially in the junction area between the fibrous roots and the rhizomes, so the underground part must also be completely buried upside down to ensure that the junction area between the fibrous roots and the rhizomes faces downward and is deeply buried, completely eliminating the regeneration of Spartina alterniflora. That is to say, Spartina alterniflora must be processed in layers. First, it is divided into two layers, and then buried upside down in layers respectively, so as to truly achieve the complete removal of Spartina alterniflora.

[0014] Furthermore, the layered upside-down burial means that first, the rhizomes in the shallow surface soil and the plants above the soil are buried upside down, and then the rhizomes in the deep soil are buried upside down.

[0015] Furthermore, the shallow surface soil is the soil at a distance of 0 - 40 cm from the ground; the deep soil is the soil at a distance of 40 - 140 cm from the ground.

[0016] Furthermore, the first layer is buried upside down in the soil more than 140 cm below the ground.

[0017] Since the above-ground part includes the rhizomes in the shallow surface layer of soil and the plants on the soil, which have strong reproductive ability, it is necessary to ensure that they are buried in 140 cm of soil to prevent resurgence.

[0018] Further, the second layer is integrally inverted and buried above the first layer that has been inverted and buried, and the burial depth reaches 120 - 140 cm or more.

[0019] The second layer is the deep underground part, with weak or almost no reproductive ability. Therefore, after excavation, it only needs to be integrally inverted and buried above the first layer. Generally, the overall inverted burial depth of the second layer can reach 120 - 140 cm or more, and at the same time, ensure that the rhizomes of the plants in the first layer are completely covered by the deep soil to a depth of less than 140 cm, effectively isolating the rhizomes from contact with the external environment.

[0020] Further, it includes the following steps:

[0021] (1) Excavate a trench with a depth exceeding 140 cm;

[0022] (2) Excavate the rhizomes in the shallow surface layer of soil and the plants on the soil of Spartina alterniflora, and integrally invert and bury them in the trench;

[0023] (3) Continue to excavate the rhizomes in the deep soil of Spartina alterniflora, and integrally invert and bury them in the trench. The rhizomes in the shallow surface layer of soil and the plants on the soil have been integrally inverted and buried in the trench, and the rhizomes in the deep soil continue to be inverted and buried above them.

[0024] Further, the length and width of the trench are both not less than 50 cm.

[0025] The length and width of the trench can be determined and adjusted according to the size of the Spartina alterniflora plants, generally not less than 50 cm.

[0026] The length and width of the trench can be set arbitrarily, as long as a reasonable depth can be achieved and it is convenient for operation.

[0027] In some ways, the width of the trench is preferably also the same as the processing width of the excavator, so that the operation is faster and more convenient.

[0028] In some ways, the width of the trench is 100 cm and the length is greater than 200 cm.

[0029] Further, it also includes step (4): Excavate the trench left after excavating Spartina alterniflora in the previous working belt for the inverted burial of Spartina alterniflora in the next working belt, and complete the inverted burial of all Spartina alterniflora in the area step by step.

[0030] The working belt described in the present invention refers to a Spartina alterniflora treatment area equivalent to the size of a trench, that is, the size of the trench matches the size of the working belt.

[0031] In some ways, a trench can be dug beside the Spartina alterniflora in a working belt first, and then the Spartina alterniflora in the working belt is buried in layers in an inverted manner to a certain depth. After burial, a new trench is formed at the place where the Spartina alterniflora originally grew, and the depth and width of this trench can just meet the requirements for burying the Spartina alterniflora in the next working belt in layers in an inverted manner. Therefore, it can be directly used for the treatment of Spartina alterniflora in the next working belt. Proceeding in this way successively, the layered inverted deep burial of all Spartina alterniflora in the area can be completed.

[0032] Furthermore, the equipment for excavation is a turning and digging machine suitable for wetland operations.

[0033] Traditional plowing methods usually have a depth of less than about 1 meter, which is difficult to block the regeneration ability of Spartina alterniflora. The rhizome regeneration ability cannot be completely destroyed, and the recurrence rate after treatment is high. Especially in areas where the roots are deep, the substrate is soft or affected by tidal scour, such as in the intertidal zone and tidal flat areas, the water flow brought by the tide will cause the rhizomes to re-colonize, resulting in recurrence in the treated area. It can be seen that the existing plowing methods are limited in application in widely distributed wetlands.

[0034] The method for layered inverted deep burial treatment of Spartina alterniflora provided by the present invention, since the burial depth reaches 140 cm and is buried in an inverted manner, completely eliminates the problem of recurrence caused by the possible re-colonization of rhizomes in the wetland environment. It is applicable to different substrates and tidal environments, especially suitable for the wetland environment where Spartina alterniflora grows. Through the method of layered deep plowing, the above-ground part and rhizomes of Spartina alterniflora are buried in layers, effectively preventing it from germinating again, thereby expanding the applicable range of the treatment method.

[0035] The excavation equipment used in the excavation step is a turning and digging machine suitable for wetland operations, which can operate stably in the intertidal zone and tidal flat environment.

[0036] Furthermore, the method for controlling the regeneration of Spartina alterniflora by deep root turning provided by the present invention includes the following steps:

[0037] 1. Demarcation and preparation of the treatment area: Before the flowering period of Spartina alterniflora, demarcate the area to be treated to ensure that the treatment scope covers the area where Spartina alterniflora grows densely and its expansion edge, and formulate mechanical operation construction organization and ecological protection and risk control measures to provide full preparation for subsequent operations.

[0038] 2. Initial trench excavation: Start excavating a trench with a depth exceeding 140 cm and a width of 100 cm from the edge of the treatment area for storing the soil and Spartina alterniflora plants dug out subsequently, ensuring that it is buried more than 1.4 m deep to block its light, air and moisture, thereby inhibiting the regrowth of rhizomes.

[0039] 3. Topsoil burial: In the area adjacent to the trench, dig the topsoil of 0 - 40 cm from the ground surface, and invert this layer of soil together with the Spartina alterniflora plants and rhizomes to the bottom of the trench, ensuring that the Spartina alterniflora plants and rhizomes are at the bottom layer, completely isolating them from light and air.

[0040] 4. Deep soil burial: After removing the topsoil, continue to excavate to a depth of 100 cm, obtain the deep soil and invert it into the previous trench to completely cover the Spartina alterniflora plants and rhizomes, ensuring deep isolation.

[0041] 5. Sequential and continuous burial: According to the above steps, continuously and uninterruptedly excavate and bury the treatment area, and sequentially advance the operation of turning over and burying until all the Spartina alterniflora plants and rhizomes (especially the first layer) in the treatment area are buried more than 140 cm deep.

[0042] 6. Follow-up monitoring and effectiveness evaluation: Within 12 months after the treatment, check the treatment area every 3 months, record and count the regrowth situation, so as to conduct local deep treatment on the regrowth area to further consolidate the treatment effect.

[0043] Furthermore, the steps for demarcating the treatment area described in step 1 can be partitioned according to the distribution density and regional characteristics of Spartina alterniflora, and are applicable to the wetland ecological treatment requirements of different areas and root depths.

[0044] Furthermore, the follow-up monitoring and effectiveness evaluation described in step 6 include the following contents: Regular inspection: Evaluate the growth of Spartina alterniflora in the treatment area every 3 months, record and count the regrowth situation; Regeneration treatment: Conduct local deep burial treatment on the regrowth area to ensure that the roots are completely damaged; Record report: Record the monitoring data and generate a treatment effectiveness report for long-term tracking and subsequent optimization of the treatment effect.

[0045] The method for completely removing Spartina alterniflora provided by the present invention has the following beneficial effects:

[0046] 1. By deeply excavating and layer-by-layer burying the Spartina alterniflora plants and their rhizomes, the depth limitation of the existing treatment methods is overcome, thereby more thoroughly inhibiting the regeneration ability of Spartina alterniflora.

[0047] 2. It does not require the use of chemical agents, avoiding the environmental pollution and ecological safety risks caused by chemical herbicides. It is environmentally friendly, easy to operate, and has strong persistence. It is suitable for the ecological management of large areas of tidal flats and wetlands, effectively curbing the resurgence of Spartina alterniflora, promoting the growth of native vegetation, facilitating habitat restoration, and maintaining regional ecological balance.

[0048] 3. A deep plowing method applicable to different substrate and tidal environments, by deeply burying the above-ground parts and rhizomes of Spartina alterniflora in layers, effectively preventing its re-germination, thus expanding the scope of application of the treatment method.

[0049] 4. It can fundamentally inhibit the regeneration ability of Spartina alterniflora, reducing the subsequent maintenance requirements, improving the economy and persistence of the treatment while ensuring the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic flow chart of the deep excavation and layered burial of Spartina alterniflora provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The present invention will be further described in detail below with reference to the embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention and do not limit it in any way. The reagents used in this embodiment are all known products and are obtained by purchasing commercially available products.

[0052] Embodiment 1. A method for completely removing Spartina alterniflora provided by the present invention

[0053] In this embodiment, in the coastal tidal flat area of Yuyao City, Zhejiang Province, an area of about 10 mu with dense growth of Spartina alterniflora is selected as the treatment pilot, and the treatment is implemented through a series of standardized steps. The flow chart is as Figure 1 shown, and the specific steps are as follows:

[0054] (1) Demarcation and preparation of the treatment area

[0055] Before the flowering period of Spartina alterniflora, demarcate the area to be treated. Ensure that the treatment area covers the area with dense growth of Spartina alterniflora and its expansion edge to ensure that subsequent treatment can completely cover the distribution range of Spartina alterniflora, laying a foundation for effective treatment. Clean the large debris and obstacles on the surface of the treatment area to facilitate subsequent excavation operations.

[0056] (2) Initial trench excavation

[0057] Use a crawler excavator with a bucket width of 1 meter to dig a trench starting from the edge of the treatment area. The trench should be more than 140 cm deep, 100 cm wide, and 300 cm long (the length and width of the trench can be determined according to the length and width of the work zone to be treated. Of course, it can be understood that the length and width of the trench can also be set arbitrarily as long as a reasonable depth can be achieved. Preferably, the width should be the same as the treatment width of the excavator, which makes the operation faster and more convenient). The initial excavation depth of the trench should be sufficient to accommodate the Spartina alterniflora shallow surface soil (40 cm from the ground) and the Spartina alterniflora plants above the ground, burying them more than 1.4 meters deep to ensure complete isolation from light, air, and moisture and inhibit their regeneration. After the initial trench excavation is completed, it serves as the starting point for the treatment work and provides space for the subsequent soil layer burial.

[0058] (3) Surface soil burial

[0059] In the area adjacent to the already dug trench, dig about 40 cm of Spartina alterniflora surface soil from the ground surface, with a width of 100 cm and a length of 200 cm. Transfer the surface soil together with the above-ground Spartina alterniflora plants and rhizomes as a whole and invert it to the bottom of the previous trench, so that the Spartina alterniflora plants are at the bottom layer of the trench. This layered burial method effectively isolates the Spartina alterniflora from contact with light and air, fundamentally inhibits its growth conditions, and blocks its regeneration potential.

[0060] (4) Deep soil burial

[0061] In the same area where the Spartina alterniflora has had its surface soil removed, continue to dig down to a depth of 100 cm to obtain deep soil. Transfer the deep soil as a whole and invert it into the previous trench to further cover the buried Spartina alterniflora plants and rhizomes, ensuring that all deep rhizomes are buried deep. Through the closed burial of the deep soil, the rhizomes of the Spartina alterniflora are completely isolated from the external environment, effectively inhibiting its regrowth. At the same time, ensure that all deep rhizomes of the Spartina alterniflora are buried in the soil layer at least 1.2 meters below, so that the rhizomes originally distributed in the deep layer are also completely covered, further inhibiting the regeneration potential.

[0062] (5) Step-by-step segmented burial

[0063] Advance in segments according to this procedure. After each Spartina alterniflora patch (with a width of 100 cm and a length of 300 cm) is dug out, the remaining trench reaches a depth of more than 140 cm, a width of 100 cm, and a length of about 300 cm, which can be used for the layered inverted-depth burial of Spartina alterniflora in the next adjacent patch. Move forward step by step according to the above steps. After the burial of the previous trench is completed, continue to repeat the excavation of the shallow surface soil and Spartina alterniflora plants, as well as the excavation and burial of the deep soil in the rear area until all Spartina alterniflora in the entire treatment area is completely buried. Cycle and advance in turn to ensure that all Spartina alterniflora plants and rhizomes in the treatment area are deeply buried, achieving thoroughness and durability of the treatment.

[0064] (6) Follow-up monitoring and effect evaluation

[0065] Within 12 months after the completion of the treatment, conduct a re-inspection of the treatment area every 3 months to observe the resurgence of Spartina alterniflora. If there is a small amount of resurgence, re-conduct deep excavation and burial treatment in local areas to further ensure the durability of the treatment effect. At the same time, record and summarize the treatment data to form an evaluation report on the treatment effect, providing a basis for the improvement and popularization of subsequent treatment strategies.

[0066] The pilot area of this embodiment was tracked at 12 months, one year, two years, and three years after the treatment. No resurgence was observed, native plants gradually recovered, and the ecosystem tended to be stable, with significant treatment effects. Based on the success of the pilot, this technology has been promoted and applied in the coastal tidal flats of Zhejiang, covering more than 5,000 mu, providing long-term protection for regional ecological environment protection and wetland restoration.

[0067] Example 2. Influence of burial depth on the removal of Spartina alterniflora

[0068] In this embodiment, a tidal flat area with concentrated distribution of Spartina alterniflora (coverage greater than 60%) was selected, and the method provided in Example 1 was used to remove Spartina alterniflora. The burial depths were respectively selected as 40, 60, 80, 100, 120, 140, 160, and 180 cm. Different treatment methods were repeated 3 times and averaged, and 1 control treatment was set. The experimental area of each treatment was 1 m * 3 m (continuous operation three times). Calculate the resurgence ratio of Spartina alterniflora based on the control. See Table 1 for details. When the burial depths were 40 cm and 60 cm, only the shallow surface soil of Spartina alterniflora (40 cm from the ground) and the Spartina alterniflora plants above the ground were buried, that is, only the first layer was inverted and buried. At other depths, the first layer and the second layer were respectively inverted and buried to investigate the influence of different burial depths on the removal effect of Spartina alterniflora. The results are shown in Table 1.

[0069] Table 1. Influence of different burial depths

[0070]

[0071]

[0072] As can be seen from Table 1, when the burial depth is in the range of 40 cm - 120 cm, Spartina alterniflora will show obvious resurgence, and only when the burial depth reaches 140 cm can the resurgence of Spartina alterniflora be completely prevented.

[0073] This embodiment further tracked the subsequent situation of burial depths above 140 cm. After continuous tracking for more than three years, no resurgence of Spartina alterniflora was seen. It can be seen that after the burial depth reaches 140 cm, Spartina alterniflora can be completely removed.

[0074] Example 3. Influence of layered burial on the removal of Spartina alterniflora

[0075] In this embodiment, a tidal flat area with concentrated distribution of Spartina alterniflora (coverage greater than 60%) was selected, and the method provided in Example 1 was used to remove Spartina alterniflora. The burial depth was the same as that in Example 1. Among them, the burial methods were respectively selected as the first layer inverted burial (only burying the first layer with reproductive ability), the whole layer unified inverted burial (without stratification, directly digging the plants underground to 140 cm and performing the overall unified inverted burial operation), and the layered inverted burial. Different treatment methods were repeated 3 times and the average value was taken, and 1 control treatment was set. The experimental area of each plot was 1 m * 3 m (continuous operation three times). According to the control, the resurgence ratio of Spartina alterniflora was calculated to investigate the influence of different burial methods on the removal effect of Spartina alterniflora. The results are shown in Table 2.

[0076] Table 2. Influence of different layered burial methods

[0077]

[0078] As can be seen from Table 2, if only the first layer with reproductive ability is inverted and buried, while the second layer remains in the soil, the probability of resurgence of Spartina alterniflora is still very high. The reason may be that there are still a small number of reproductive rhizomes remaining in the second layer. If there is no layered inverted burial, but directly the whole is inverted and buried, there is also a certain proportion of resurgence. The reason is that when the whole is inverted and buried, it cannot be ensured that all the first layers with reproductive ability are buried below 140 cm deeply, and there are some cases where the burial depth of some rhizomes is not deep, resulting in the resurgence of a small number of Spartina alterniflora. Therefore, strict layered burial must be carried out to completely eliminate the possibility of resurgence of Spartina alterniflora.

[0079] Example 4. Influence of inverted burial on the removal of Spartina alterniflora

[0080] In this embodiment, a tidal flat area with concentrated distribution of Spartina alterniflora (coverage greater than 60%) was selected, and the method provided in Embodiment 1 was used to remove Spartina alterniflora. The burial depth was kept the same as that in Embodiment 1. Among them, the burial methods were respectively selected as non-inverted burial (equivalent to the first layer being above the second layer, the first layer being buried below 120 cm, and the second layer being buried below 140 cm), only the first layer being inverted and buried, and both the first layer and the second layer being inverted and buried. Different treatment methods were repeated at 3 places and the average value was taken, and a control treatment was set at 1 place. The experimental area of each place was 1 m * 3 m (operated continuously three times). The resurgence ratio of Spartina alterniflora was calculated according to the control, and the influence of different burial methods on the removal effect of Spartina alterniflora was investigated. The results are shown in Table 3.

[0081] Table 3. Influence of different inverted burial methods

[0082]

[0083] As can be seen from Table 3, inverted burial is very important. If inverted burial is not carried out, even at the same burial depth, Spartina alterniflora is still likely to resurge. The reason may be that when there is no inversion, some rhizomes with strong reproductive ability may be entrained in the soil layer with a depth less than 140 cm and set less than 120 cm during the burial process, resulting in resurgence. Moreover, it is not possible to only invert the first layer. Both the first layer and the second layer must be inverted and buried to achieve the best removal effect, because there may still be reproductive rhizomes at the interface between the second layer and the first layer. Without inverted burial, it will give the reproductive rhizomes in this part the opportunity to penetrate into other soil layers, bringing the risk of resurgence. Therefore, it is necessary to strictly follow the layered inverted burial method provided by the present invention to truly prevent the resurgence of Spartina alterniflora.

[0084] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A method for removing Spartina alterniflora, characterized in that: Dig out all the plants and rhizomes of Spartina alterniflora and bury them upside down in the soil.

2. The method according to claim 1, characterized in that All plants and rhizomes of Spartina alterniflora need to be divided into two layers and buried upside down in layers; the first layer includes the rhizomes in the shallow surface soil and the plants on the soil; The second layer includes the deep soil rhizomes.

3. The method according to claim 2, characterized in that The layered inverted burial refers to first burying the rhizomes of the shallow surface soil and the plants on the soil invertedly, and then burying the rhizomes of the deep soil invertedly.

4. The method according to claim 3, characterized in that The shallow soil layer is the soil at a depth of 0 to 40 cm from the ground; the deep soil layer is the soil at a depth of 40 to 140 cm from the ground.

5. The method according to claim 4, characterized in that The first layer is entirely inverted and buried in the soil 140 cm below the ground.

6. The method according to claim 5, characterized in that The second layer is entirely inverted and buried above the first layer, and the burial depth reaches more than 120 to 140 cm.

7. The method according to claim 6, characterized in that The following steps are involved: (1) Digging trenches deeper than 140 cm; (2) digging out the rhizomes and plants of Spartina alterniflora from the shallow surface soil and burying them upside down in the trench; (3) Continue to dig deep soil rhizomes of Spartina alterniflora and bury them upside down in the trench as a whole. The shallow soil rhizomes and plants on the soil are already buried upside down in the trench, and the deep soil rhizomes continue to be buried upside down above them.

8. The method according to claim 7, characterized in that The length and width of the groove are no less than 50 cm.

9. The method according to claim 8, characterized in that The step also includes step (4): the grooves left after digging the Spartina alterniflora in the previous operation zone are used for the inverted burial of the Spartina alterniflora in the next operation zone, and the inverted burial of all the Spartina alterniflora in the area is completed in sequence.

10. The method according to claim 9, characterized in that The excavation equipment is a digging machine suitable for wetland operations.

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