Analysis method for dynamic landform threshold value of planting and survival of tidal flat vegetation and application of analysis method

Abstract

The invention belongs to the technical field of test simulation and parameterization calculation, and particularly relates to an analysis method for a dynamic landform threshold value of tidal flat vegetation planting and survival and application of the analysis method. Because the vegetation growth on the tidal flat site is mainly controlled by flooding and elevation change of the tidal flat bed, plant density parameters under different to-be-measured tidal flat flooding time parameters are obtained, a dynamic landform threshold model of tidal flat vegetation planting is established, and the influence of flooding on vegetation planting can be systematically represented; according to the method, elevation change parameters and plant density relative change parameters of a tidal flat bed to be measured under a waterflooding condition are obtained, and a dynamic landform threshold model of tidal flat vegetation survival is established, so that the influence of local landform change on vegetation survival can be systematically represented. Furthermore, a fitting curve is established based on the obtained parameter result, and parameterized analysis of planting and survival of tidal flat vegetation can be realized. The method can provide reference for ecological restoration work of the tidal flat wetland.

Description

Technical Field

[0001] The present invention belongs to the technical field of experimental simulation and parametric calculation, and particularly relates to an analysis method and application of dynamic geomorphic thresholds for the colonization and survival of tidal flat vegetation. Background Art

[0002] Coastal tidal flats are the most widely distributed wetland systems in the world, with various ecological functions such as carbon sequestration, water purification, and sediment promotion. With the advancement of marine ecological restoration work, it is necessary to restore the original tidal flat vegetation during the process of returning reclaimed land to the sea.

[0003] The restoration of tidal flat vegetation is closely related to the local dynamic geomorphic conditions. During the vegetation colonization process, if the dynamic conditions are too strong, it will be difficult for vegetation seeds to germinate and survive. In addition, the growth of vegetation seedlings is also controlled by geomorphic conditions. If the geomorphic changes caused by extreme dynamics exceed the tolerance of vegetation seedlings, it will also affect the restoration effect.

[0004] Therefore, on the premise of fully considering the on-site conditions, establishing a set of experimental methods for evaluating the dynamic geomorphic thresholds for the customization and survival of tidal flat vegetation can play an important reference role in carrying out the restoration work of original tidal flat vegetation, which is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to propose an analysis method for the dynamic geomorphic thresholds of the colonization and survival of tidal flat vegetation, and to evaluate the impact of tidal flat dynamic geomorphology on vegetation colonization and / or survival.

[0006] The present invention provides an analysis method for the dynamic geomorphic thresholds of the colonization and survival of tidal flat vegetation, including the following I and / or II: I: Obtain the flooding time parameters of the tidal flat to be measured and the plant density parameters at different flooding times, and perform model construction to obtain the dynamic geomorphic threshold model for the colonization of tidal flat vegetation; II: Obtain the parameters of the change in the bottom bed elevation of the tidal flat to be measured and the relative change parameters of the plant density under flooding conditions, and perform model construction to obtain the dynamic geomorphic threshold model for the survival of tidal flat vegetation.

[0007] Preferably, in the above I, the method for obtaining the flooding time parameters of the tidal flat to be measured and the plant density parameters at different flooding times includes the following steps: Set 6 layers of steps in the water injection and pumping device, and set planting elements filled with the consolidated bottom mud of the tidal flat to be measured on each layer of steps; Sow vegetation seeds in the planting elements, and make the flooding times of the 6 layers of steps in the water injection and pumping device be 100%, 74%, 56%, 37%, 19%, and 5% in sequence every day by injecting and pumping water, so as to obtain the flooding time parameters of the tidal flat to be measured; the height of the consolidated bottom mud of the tidal flat to be measured on each layer of steps is the same; After sowing for 7 - 14 days, the plant density in different stepped planting elements was counted to obtain the plant density parameters under different flooding times.

[0008] Preferably, in the above - mentioned Ⅰ, the method for model construction includes fitting the plant density parameters and the flooding time parameters under different flooding times by using a logarithmic relationship.

[0009] Preferably, the vegetation seeds include Suaeda glauca seeds.

[0010] Preferably, in the above - mentioned Ⅱ, the method for obtaining the change parameters of the elevation of the bottom bed of the tidal flat to be measured and the relative change parameters of the plant density under flooding conditions includes the following steps: Build steps in the water injection and pumping device, and set cultivation elements containing the consolidated bottom mud of the tidal flat to be measured on the steps; Cultivate vegetation seedlings in the cultivation elements, and simulate the flooding situation of the tidal flat to be measured by injecting and pumping water every day; After the vegetation seedlings on the steps grow stably, randomly divide them into 6 groups. Record the initial elevation of the bottom mud of different groups of vegetation seedlings as 0 cm, change the elevation of the bottom mud of different groups of vegetation seedlings, and the test bottom mud elevations corresponding to the 6 groups of vegetation seedlings are +1 cm, +2 cm, 0 cm, -1 cm, -2 cm, and 0 cm in sequence to obtain the change parameters of the elevation of the bottom bed of the tidal flat to be measured; continue to inject and pump water every day to simulate the flooding situation of the tidal flat to be measured; After continuing to inject and pump water for 14 - 30 days, count the plant density of different groups of vegetation seedlings, and calculate the ratio of the plant density under the condition of bottom bed elevation change to the plant density under the condition of no bottom bed elevation change to obtain the relative change parameters of the plant density.

[0011] Preferably, building steps in the water injection and pumping device includes setting 6 - layer steps in the water injection and pumping device; obtaining the change parameters of the elevation of the bottom bed of the tidal flat to be measured and the relative change parameters of the plant density for each layer of steps; The flooding times of the 6 - layer steps are 100%, 74%, 56%, 37%, 19%, and 5% in sequence.

[0012] Preferably, in the above - mentioned Ⅱ, the method for model construction includes fitting the relative change parameters of the plant density of the tidal flat to be measured under flooding conditions and the change parameters of the bottom bed elevation by using a quadratic polynomial.

[0013] Preferably, the plant height of the vegetation seedlings > 1 cm; the vegetation seedlings include Suaeda glauca seedlings.

[0014] The present invention also provides the application of the above - mentioned analysis method in evaluating the colonization and / or survival of tidal flat vegetation.

[0015] The present invention also provides a method for parametrically evaluating the colonization and / or survival of tidal flat vegetation, including the following (1) and / or (2): (1): Obtain the tidal flat flooding time parameter and substitute it into the dynamic geomorphic threshold model for the colonization of tidal flat vegetation to obtain the evaluation result of the colonization of tidal flat vegetation; the dynamic geomorphic threshold model for the colonization of tidal flat vegetation is the dynamic geomorphic threshold model for the colonization of tidal flat vegetation obtained by the analysis method described in the above technical solution; (2): Obtain the change parameter of the tidal flat bed elevation and substitute it into the dynamic geomorphic threshold model for the survival of tidal flat vegetation to obtain the evaluation result of the survival of tidal flat vegetation; the dynamic geomorphic threshold model for the survival of tidal flat vegetation is the dynamic geomorphic threshold model for the survival of tidal flat vegetation obtained by the analysis method described in the above technical solution.

[0016] Beneficial effects: The present invention provides an analysis method for the dynamic geomorphic thresholds of the colonization and survival of tidal flat vegetation, including the following I and / or II: I: Obtain the tidal flat flooding time parameter and the plant density parameter under different flooding times of the tidal flat to be measured, and perform model construction to obtain the dynamic geomorphic threshold model for the colonization of tidal flat vegetation; II: Obtain the change parameter of the tidal flat bed elevation and the relative change parameter of the plant density under flooding conditions of the tidal flat to be measured, and perform model construction to obtain the dynamic geomorphic threshold model for the survival of tidal flat vegetation. Since the growth of on-site vegetation in tidal flats is mainly controlled by flooding and the change of the tidal flat bed elevation, the present invention obtains the plant density parameter under different tidal flat flooding time parameters to be measured and establishes a dynamic geomorphic threshold model for the colonization of tidal flat vegetation, which can systematically characterize the impact of flooding on vegetation colonization; obtain the change parameter of the tidal flat bed elevation and the relative change parameter of the plant density under flooding conditions of the tidal flat to be measured, and establish a dynamic geomorphic threshold model for the survival of tidal flat vegetation, which can systematically characterize the impact of local geomorphic changes (sediment elevation) on vegetation survival. Further, based on the obtained parameter results, the present invention establishes a fitting curve, which can realize the parametric analysis of the colonization and survival of tidal flat vegetation. The present invention can provide a reference for the ecological restoration work of tidal flat wetlands. Description of the drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments.

[0018] Figure 1 It is the layout diagram of the test water pool and planting tank in Embodiment 1; Figure 2 It is the statistical result diagram of the vegetation quantity in Pool No. 1 in Embodiment 1; Figure 3 It is the statistical result diagram of the vegetation quantity in Pool No. 2 in Embodiment 1 Figure 4 It is the relationship diagram between the flooding time of Suaeda salsa seeds and their colonization density in Embodiment 1; Figure 5 It is a graph showing the relationship between the relative change in vegetation density and elevation change at 5% of the flooding time in Example 1; Figure 6 It is a graph showing the relationship between the relative change in vegetation density and elevation change at 19% of the flooding time in Example 1; Figure 7 It is a graph showing the relationship between the relative change in vegetation density and elevation change at 37% of the flooding time in Example 1; Figure 8 It is a graph showing the relationship between the relative change in vegetation density and elevation change at 56% of the flooding time in Example 1. Detailed implementation manners

[0019] The present invention provides a method for analyzing the dynamic geomorphic threshold of tidal flat vegetation colonization and survival, including the following I and / or II: I: Obtain the flooding time parameters of the tidal flat to be measured and the plant density parameters at different flooding times, and perform model construction to obtain the dynamic geomorphic threshold model for tidal flat vegetation colonization; II: Obtain the bottom bed elevation change parameters and the relative change parameters of plant density of the tidal flat to be measured under flooding conditions, and perform model construction to obtain the dynamic geomorphic threshold model for tidal flat vegetation survival.

[0020] The present invention obtains the flooding time parameters of the tidal flat to be measured and the plant density parameters at different flooding times. As an implementation manner, the method for obtaining the flooding time parameters of the tidal flat to be measured and the plant density parameters at different flooding times in the present invention includes the following steps: Set 6 layers of steps in the water injection and pumping device, and set planting elements filled with consolidated bottom mud of the tidal flat to be measured on each layer of steps; Sow vegetation seeds in the planting elements, and make the flooding times of the 6 layers of steps in the water injection and pumping device be 100%, 74%, 56%, 37%, 19% and 5% in sequence every day by injecting water and pumping water, so as to obtain the flooding time parameters of the tidal flat to be measured; The height of the consolidated bottom mud of the tidal flat to be measured on each layer of steps is the same; After sowing for 7 - 14 days, count the plant density in the planting elements on different steps to obtain the plant density parameters at different flooding times. Since the growth of on-site vegetation is mainly controlled by the flooding duration, in the present invention, due to the setting of different steps and with the aid of the water injection and pumping device, the periodic rise and fall of the water level in the water injection and pumping device can be realized, and there are obvious differences in the flooding times of the vegetation planting units at different elevation positions, which can further characterize the influence of flooding on vegetation colonization.

[0021] As an implementation manner, the present invention takes the lower surface of the water injection and pumping device as the initial height, and records the initial height as 0.0 cm. The heights of the six steps are successively 0.0 cm, 11.0 cm, 18.0 cm, 25.5 cm, 33.0 cm, and 40.5 cm from low to high. The present invention has no strict requirements on the specific structure of the water injection and pumping device, as long as it can control the water level change, meet the flooding time of different steps, and simulate the flooding situation of the tidal flat to be measured. For example, it can be a pool equipped with a water level sensor and a submersible pump. In the present invention, the water injection and pumping time is adjusted according to the flooding time set by the present invention, and the water level can be reduced from the highest to the lowest within 6 to 12 hours; the highest is the water level height when the vegetation seeds on the highest step are flooded, and the lowest is the water level height when the vegetation seeds on the lowest step are flooded. In the present invention, the flooding time is the proportion of the flooding time of the vegetation seeds within one day.

[0022] As an implementation manner, the height of the planting element of the present invention is 4.5 cm. As an implementation manner, the specification of the planting element of the present invention is (30 - 50) × (20 - 40) cm; as an implementation manner, the specification of the planting element of the present invention is 30 × 20 cm. As an implementation manner, the planting element of the present invention can be a planting trough.

[0023] As an implementation manner, the vegetation seeds of the present invention include Suaeda glauca seeds. In the specific embodiments of the present invention, the Suaeda glauca seeds are taken as an example for illustration, but it cannot be understood as the entire protection scope of the present invention only.

[0024] After obtaining the flooding time parameters of the tidal flat to be measured and the plant density parameters under different flooding times, the present invention constructs a model to obtain a dynamic geomorphic threshold model for the colonization of tidal flat vegetation. As an implementation manner, the method for constructing the model of the present invention includes fitting the plant density parameters and the flooding time parameters under different flooding times by using a logarithmic relationship. As an implementation manner, the present invention takes the plant density under the condition of 5% flooding time as a benchmark, and calculates the relative plant density under other flooding time conditions. The present invention has no strict requirements on the specific manner of the fitting, and the conventional operations in the art can be adopted.

[0025] As an implementation manner, the dynamic geomorphic threshold model for the colonization of tidal flat vegetation of the present invention is a fitting equation, and the fitting equation is y = 1.2e -3.853x ; where x is the flooding time of the tidal flat to be measured, with the unit of %; y is the relative plant density, with the unit of %.

[0026] The present invention obtains the change parameters of the elevation of the bottom bed of the tidal flat to be measured and the relative change parameters of the plant density under flooding conditions. As an implementation manner, the method for obtaining the change parameters of the elevation of the bottom bed of the tidal flat to be measured and the relative change parameters of the plant density under flooding conditions of the present invention includes the following steps: Build steps in the water injection and pumping device, and arrange cultivation elements containing the consolidated bottom mud of the tidal flat to be measured on the steps; Cultivate vegetation seedlings in the cultivation elements, and simulate the flooding situation of the tidal flat to be measured by injecting and pumping water every day; After the vegetation seedlings on the steps grow stably, randomly divide them into 6 groups, record the initial bottom mud elevation of the vegetation seedlings in different groups as 0 cm, change the bottom mud elevation of the vegetation seedlings in different groups, and the test bottom mud elevations corresponding to the 6 groups of vegetation seedlings are +1 cm, +2 cm, 0 cm, -1 cm, -2 cm and 0 cm in sequence, so as to obtain the change parameters of the elevation of the bottom bed of the tidal flat to be measured; Continue to inject and pump water every day to simulate the flooding situation of the tidal flat to be measured; After continuing to inject and pump water for 14 to 30 days, count the plant density of the vegetation seedlings in different groups, and calculate the ratio of the plant density under the condition of bottom bed elevation change to the plant density under the condition of no bottom bed elevation change, so as to obtain the relative change parameters of the plant density. Since under the same flooding probability, the growth of on-site vegetation is mainly affected by local geomorphic changes (bottom mud elevation), in the present invention, different bottom mud elevations are set to further characterize the generation and survival of vegetation under different geomorphic disturbance conditions.

[0027] As an implementation manner, building steps in the water injection and pumping device in the present invention includes setting 6 layers of steps in the water injection and pumping device; Obtaining the change parameters of the elevation of the bottom bed of the tidal flat to be measured and the relative change parameters of the plant density for each layer of steps; The flooding times of the 6 layers of steps are 100%, 74%, 56%, 37%, 19% and 5% in sequence. The method for establishing the flooding times of the 6 layers of steps to be 100%, 74%, 56%, 37%, 19% and 5% in the present invention is the same as that described above, and will not be elaborated here.

[0028] As an implementation manner, the plant height of the vegetation seedlings in the present invention is > 1 cm. As an implementation manner, the vegetation seedlings in the present invention include Suaeda glauca seedlings. As an implementation manner, the vegetation seedlings in the present invention are the vegetation seedlings obtained after natural germination in an outdoor open space. In the specific embodiments of the present invention, Suaeda glauca seedlings are taken as an example for illustration, but it should not be understood as the entire protection scope of the present invention only.

[0029] After obtaining the change parameters of the elevation of the bottom bed of the tidal flat to be measured and the relative change parameters of the plant density under flooding conditions, the present invention conducts model construction to obtain the dynamic geomorphic threshold model for the survival of tidal flat vegetation. As an implementation manner, the method for conducting model construction in the present invention includes fitting the relative change parameters of the plant density of the tidal flat to be measured and the change parameters of the bottom bed elevation under flooding conditions by using a quadratic polynomial. The present invention has no strict requirements on the specific manner of the fitting, and conventional operations in the art can be adopted.

[0030] As an implementation, the dynamic geomorphic threshold model for the survival of tidal flat vegetation in the present invention is a fitting equation. The fitting equations at 5%, 19%, 37%, and 56% of the flooding time are y = -441.2x 2 - 4x, y = -5261x 2 - 71.37x, y = -1600x 2 - 12x and y = -975x 2 - 0.75x - 0.495; where x is the elevation change, with the unit of m; y is the relative plant density, with the unit of %.

[0031] As an implementation, the consolidated bottom mud of the tidal flat in the present invention is the bottom mud of the tidal flat to be measured that is consolidated to stability under its own weight.

[0032] By obtaining the flooding time parameter of the tidal flat to be measured and the plant density parameter under different flooding times, obtaining the bottom bed elevation change parameter and the relative change parameter of the plant density of the tidal flat to be measured under flooding conditions, and constructing a model, the dynamic geomorphic threshold model for the colonization of tidal flat vegetation and the dynamic geomorphic threshold model for the survival of tidal flat vegetation obtained can evaluate the colonization and / or survival of tidal flat vegetation, and a reasonable parametric calculation method is obtained based on the analysis of the test results, which can play an important reference role in carrying out the restoration work of tidal flat native vegetation. Therefore, the application of the above-mentioned analysis method in evaluating the colonization and / or survival of tidal flat vegetation also belongs to the protection scope of the present invention.

[0033] The present invention also provides a method for parametrically evaluating the colonization and / or survival of tidal flat vegetation, including the following (1) and / or (2): (1): Obtain the flooding time parameter of the tidal flat, substitute it into the dynamic geomorphic threshold model for the colonization of tidal flat vegetation, and obtain the evaluation result of the colonization of tidal flat vegetation; the dynamic geomorphic threshold model for the colonization of tidal flat vegetation is the dynamic geomorphic threshold model for the colonization of tidal flat vegetation obtained by the analysis method described in the above technical solution; (2): Obtain the bottom bed elevation change parameter of the tidal flat, substitute it into the dynamic geomorphic threshold model for the survival of tidal flat vegetation, and obtain the evaluation result of the survival of tidal flat vegetation; the dynamic geomorphic threshold model for the survival of tidal flat vegetation is the dynamic geomorphic threshold model for the survival of tidal flat vegetation obtained by the analysis method described in the above technical solution.

[0034] To further illustrate the present invention, the following describes in detail an analysis method and its application of the dynamic geomorphic threshold for the colonization and survival of tidal flat vegetation provided by the present invention with reference to the accompanying drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0035] Example 1 Analysis method for dynamic geomorphic thresholds of tidal flat vegetation colonization and survival, the specific steps are as follows: 1. Collect the bottom mud of the actual tidal flat vegetation area, lay it flat in the laboratory vegetation planting tank, and let it stand for more than one week to consolidate and reach stability under its own weight.

[0036] 2. In the way of Figure 1 , set up two adjacent experimental water tanks (No. 1 water tank and No. 2 water tank) outdoors. Each experimental water tank forms a slope by stacking bricks to reflect the differences at different elevation positions of the tidal flat. Among them, taking the bottom of the experimental water tank as the benchmark, each experimental water tank is respectively provided with 6 layers of steps. The heights of the 1st - 6th steps are 0.0 cm, 11.0 cm, 18.0 cm, 25.5 cm, 33.0 cm and 40.5 cm in sequence. A planting tank filled with consolidated and stable bottom mud is placed on each layer. The top elevations of the planting tanks are 4.5 cm, 15.5 cm, 22.5 cm, 30.0 cm, 37.5 cm and 45.0 cm in sequence; the planar size of the planting tank on the 1st step is 50 cm × 40 cm; the planar sizes of the planting tanks on the 2nd - 6th steps are 30 cm × 20 cm, and two are set in parallel.

[0037] 3. Install a water level sensor and a submersible pump in each experimental water tank to control the water level change in the water tank and simulate the on - site tidal situation. According to the actual tidal situation on site, by controlling the rotation speed of the submersible pump, the water level in the experimental water tank is lowered from the highest to the bottom of the water tank within 6 hours; when the water level in the No. 1 experimental water tank drops to the lowest, the water level in the No. 2 experimental water tank reaches the highest accordingly. At this time, the water is pumped from the No. 2 water tank to the No. 1 water tank, and so on to simulate the ebb and flow of the on - site tide. According to the saltwater time, the flooding times of the 1st - 6th layers of steps are 100%, 74%, 56%, 37%, 19% and 5% in sequence.

[0038] 4. Conduct a vegetation seed germination experiment. Sow the seeds of Suaeda salsa in the planting tanks of the No. 1 experimental water tank, and set up a control for natural germination of Suaeda salsa seeds sown in the planting tanks in the outdoor open space. During the experiment of the control treatment group, ensure that the humidity in the planting tank is about 70%.

[0039] 5. 7 - 14 days after vegetation sowing, according to the actual growth situation of the vegetation, transfer the seedlings with a plant height greater than 1 cm in the planting tanks in the outdoor open space to the No. 2 water tank for continuous experiment. Divide the seedlings into 36 groups, with 100 seedlings in each group, and plant them on the 6 - layer slopes in the No. 2 water tank, that is, there are 6 groups of seedlings on each step of the No. 2 water tank, that is, there are 3 groups of seedlings in the first parallel on each step of the No. 2 water tank, and there are 3 groups of seedlings in the second parallel on each step of the No. 2 water tank.

[0040] 6. Seven days after transplantation, when the vegetation growth tended to be stable, the elevation of the bottom sediment in each planting trough of the second pool was artificially changed to study the impact of local geomorphic changes on the survival of vegetation seedlings. Among them, the initial bottom elevation of each layer of the second pool was recorded as 0 cm, and the test bottom elevations corresponding to the three groups of seedlings in the first parallel layers 3 - 5 from left to right were +1 cm, +2 cm, and 0 cm respectively; the test bottom elevations corresponding to the three groups of seedlings in the second parallel layers 3 - 5 from left to right were -1 cm, -2 cm, and 0 cm respectively.

[0041] 7. Fourteen to thirty days after transplantation, the number of plants in the planting troughs in the first and second pools was counted respectively, and the results are as Figure 2 and 3 shown. Calculate the plant density in the planting troughs of the first pool. If the number of plants in the planting trough is n, then the plant density in the first pool is n / 0.06 (ind / m 2 ). Based on the experimental data of the first pool, taking the group with a 5% flooding time as the reference group, the relative plant density under other flooding time conditions was calculated, and the relative plant density and the flooding time were fitted using a logarithmic relationship to obtain a parametric calculation method for vegetation establishment. The results are as Figure 4 shown. Calculate the survival rate of the plants in the planting troughs of the second pool. If the number of plants in the planting trough is n, then the plant survival rate in the second pool is n / 100. Based on the experimental results of the second pool, the impact of local geomorphic changes on the survival rate of plant seedlings under different flooding times was obtained. The survival rate of plant seedlings can be reflected by the ratio of the plant density under the condition of bottom bed elevation change to the plant density under the condition of no bottom bed change. A quadratic polynomial can be used to fit the relationship between the relative change in plant density and the change in bottom bed elevation, and the results are as Figures 5 - 8 shown.

[0042] During the research process of this embodiment, the seedlings did not survive under the condition of a 74% flooding time, so no statistics were conducted. It can be seen from Figures 2 - 8 that there is a certain threshold for the impact of flooding time on the survival rate of seedling plants. When the flooding time exceeds this threshold, the seedling survival rate will decrease significantly, and its impact degree will exceed the result of bottom bed siltation. When using the formula for calculation, the impact of bottom bed change at 0% flooding time and the relationship between seed flooding time and seedling plant density can be comprehensively considered to achieve the effect of comprehensively considering flooding time and bottom bed change.

[0043] It can be seen from the above content that the method provided by the present invention can obtain the dynamic geomorphic threshold for the establishment and survival of tidal flat vegetation, parametrically evaluate the establishment and survival of tidal flat vegetation, and provide a reference value for the ecological restoration work of tidal flat wetlands.

[0044] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, rather than all embodiments. People can also obtain other embodiments based on these embodiments without creative work, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for analyzing the dynamic geomorphic thresholds of colonization and survival of tidal flat vegetation, characterized in that, It includes the following I and / or II: I: Obtain the tidal flat flooding time parameter to be measured and the plant density parameter under different flooding times, and conduct model construction to obtain the dynamic geomorphic threshold model for the colonization of tidal flat vegetation; II: Obtain the change parameter of the bottom bed elevation of the tidal flat to be measured and the relative change parameter of the plant density under flooding conditions, and conduct model construction to obtain the dynamic geomorphic threshold model for the survival of tidal flat vegetation.

2. The analysis method according to claim 1, wherein In the above I, the method for obtaining the tidal flat flooding time parameter to be measured and the plant density parameter under different flooding times includes the following steps: Set 6 layers of steps in the water injection and pumping device, and on each layer of steps, set planting elements filled with the consolidated bottom mud of the tidal flat to be measured; Sow vegetation seeds in the planting elements. Every day, through water injection and pumping, make the flooding times of the 6 layers of steps in the water injection and pumping device be 100%, 74%, 56%, 37%, 19% and 5% in sequence to obtain the tidal flat flooding time parameter to be measured; the height of the consolidated bottom mud of the tidal flat to be measured on each layer of steps is the same; After sowing for 7 - 14 days, count the plant density in the planting elements of different steps to obtain the plant density parameter under different flooding times.

3. The analysis method according to claim 2, characterized in that, In the above I, the method for model construction includes fitting the plant density parameter under different flooding times and the flooding time parameter using a logarithmic relationship.

4. The analysis method according to claim 2, characterized in that The vegetation seeds include Suaeda glauca seeds.

5. The analysis method according to claim 1, wherein In the above II, the method for obtaining the change parameter of the bottom bed elevation of the tidal flat to be measured and the relative change parameter of the plant density under flooding conditions includes the following steps: Build steps in the water injection and pumping device, and on the steps, set cultivation elements filled with the consolidated bottom mud of the tidal flat to be measured; Cultivate vegetation seedlings in the cultivation elements, and every day, through water injection and pumping, simulate the flooding situation of the tidal flat to be measured; After the vegetation seedlings on the steps grow stably, randomly divide them into 6 groups. Record the initial bottom mud elevation of different groups of vegetation seedlings as 0 cm, change the bottom mud elevation of different groups of vegetation seedlings, and the corresponding test bottom mud elevations of the 6 groups of vegetation seedlings are +1 cm, +2 cm, 0 cm, -1 cm, -2 cm and 0 cm in sequence to obtain the change parameter of the bottom bed elevation of the tidal flat to be measured; continue to inject water and pump water every day to simulate the flooding situation of the tidal flat to be measured; Continue to inject water and pump water every day for 14 - 30 days, count the plant density of different groups of vegetation seedlings, and calculate the ratio of the plant density under the condition of bottom bed elevation change to the plant density under the condition of no bottom bed elevation change to obtain the relative change parameter of the plant density.

6. The analysis method according to claim 5, characterized in that, The step of building steps in the water injection and pumping device includes setting 6 layers of steps in the water injection and pumping device; obtaining the change parameter of the bottom bed elevation of the tidal flat to be measured and the relative change parameter of the plant density for each layer of steps; The flooding times of the 6 layers of steps are 100%, 74%, 56%, 37%, 19% and 5% in sequence.

7. The analysis method according to claim 5, wherein In the above II, the method for model construction includes fitting the relative change parameter of the plant density of the tidal flat to be measured under flooding conditions and the change parameter of the bottom bed elevation using a quadratic polynomial.

8. The analysis method according to claim 5, characterized in that The plant height of the vegetation seedlings > 1 cm; the vegetation seedlings include Suaeda glauca seedlings.

9. Application of the analysis method according to any one of claims 1 - 8 in evaluating the colonization and / or survival of tidal flat vegetation.

10. A method for parametrically evaluating the colonization and / or survival of tidal flat vegetation, characterized in that, It includes the following (1) and / or (2): (1): Obtain the tidal flat flooding time parameter and substitute it into the dynamic geomorphic threshold model for tidal flat vegetation establishment to obtain the evaluation result of tidal flat vegetation establishment; the dynamic geomorphic threshold model for tidal flat vegetation establishment is the dynamic geomorphic threshold model for tidal flat vegetation establishment obtained by the analysis method described in any one of claims 2 to 4; (2): Obtain the tidal flat bed elevation change parameter and substitute it into the dynamic geomorphic threshold model for tidal flat vegetation survival to obtain the evaluation result of tidal flat vegetation survival; the dynamic geomorphic threshold model for tidal flat vegetation survival is the dynamic geomorphic threshold model for tidal flat vegetation survival obtained by the analysis method described in any one of claims 5 to 8.

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