An analytical method for dynamic geomorphic thresholds of tidal flat vegetation colonization and survival and its application

Abstract

The present invention belongs to the field of experimental simulation and parameterized calculation technology, and specifically relates to an analysis method for the dynamic geomorphic threshold value of tidal flat vegetation colonization and survival and its application. Since the growth of vegetation on the tidal flat site is mainly controlled by flooding and changes in the elevation of the tidal flat bottom bed, the present invention obtains plant density parameters under different flooding time parameters of the tidal flat to be tested, establishes a dynamic geomorphic threshold model for tidal flat vegetation colonization, and can systematically characterize the impact of flooding on vegetation colonization; obtains the elevation change parameters and relative change parameters of the tidal flat bottom bed to be tested under flooding conditions, establishes a dynamic geomorphic threshold model for tidal flat vegetation survival, and can systematically characterize the impact of local geomorphic changes on vegetation survival. Furthermore, based on the obtained parameter results, the present invention establishes a fitting curve, which can realize parametric analysis of tidal flat vegetation colonization and survival. The present invention can provide a reference for tidal flat wetland ecological restoration work.

Description

Technical Field

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

[0002] Coastal tidal flats are the world's most widespread wetland systems, providing diverse ecological functions such as carbon sequestration, water purification, and sedimentation reduction. As marine ecological restoration efforts progress, restoration of native tidal flat vegetation is necessary during the process of returning land to the sea.

[0003] Restoring tidal flat vegetation is closely related to local dynamic geomorphological conditions. Overly strong dynamic conditions during the vegetation establishment process can make it difficult for plant seeds to germinate and survive. Furthermore, the growth of seedlings is also controlled by geomorphological conditions. If the geomorphological changes caused by extreme dynamics exceed the seedlings' tolerance, restoration efforts will also be affected.

[0004] Therefore, under the premise of fully considering the on-site conditions, establishing a set of dynamic geomorphic threshold test methods to evaluate the customized survival of tidal flat vegetation can play an important reference role in carrying out the restoration of native tidal flat vegetation. It is an issue that technical personnel in this field urgently need to solve. Summary of the Invention

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

[0006] The present invention provides a method for analyzing the dynamic geomorphic thresholds of tidal flat vegetation colonization and survival, including the following I and / or II:

[0007] I: Obtain the flooding time parameters of the tidal flat to be tested and the plant density parameters under different flooding times, and construct a model to obtain the dynamic geomorphic threshold model of tidal flat vegetation colonization;

[0008] II: Obtain the parameters of the change in bottom elevation and relative change in plant density of the tidal flat to be tested under flooding conditions, and construct a model to obtain the dynamic geomorphological threshold model for the survival of tidal flat vegetation.

[0009] Preferably, in said I, the method for obtaining the flooding time parameter of the tidal flat to be measured and the plant density parameter under different flooding times comprises the following steps:

[0010] Six steps are set up in the water injection and pumping device, and a planting element with the tidal flat consolidated bottom mud to be tested is set up on each step;

[0011] Vegetation seeds are sown in the planting element, and water is injected and pumped out every day so that the flooding time of the six steps in the water injection and pumping device is 100%, 74%, 56%, 37%, 19% and 5% respectively, thereby obtaining the flooding time parameter of the tidal flat to be measured; the height of the consolidated bottom mud of the tidal flat to be measured is the same on each step;

[0012] 7 to 14 days after sowing, the plant density in different step planting elements was counted to obtain the plant density parameters under different flooding times.

[0013] Preferably, in said Ⅰ, the method for constructing the model includes fitting the plant density parameter and the flooding time parameter under different flooding times using a logarithmic relationship.

[0014] Preferably, the vegetation seeds include Suaeda salsa seeds.

[0015] Preferably, in said II, the method for obtaining the elevation change parameters of the tidal flat bottom and the relative change parameters of the plant density under flooding conditions comprises the following steps:

[0016] Building steps in the water injection and pumping device, and placing a cultivation element containing the tidal flat consolidated bottom mud to be tested on the steps;

[0017] Planting plant seedlings in the cultivation element, and simulating flooding conditions of the tidal flat to be tested by injecting and pumping water every day;

[0018] After the vegetation seedlings on the steps have grown stably, 6 groups are randomly divided. The initial bottom mud elevation of the vegetation seedlings in different groups is recorded as 0 cm. The bottom mud elevations of the vegetation seedlings in different groups are changed. 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, respectively, to obtain the elevation change parameters of the tidal flat to be tested. Water injection and pumping are continued every day to simulate the flooding of the tidal flat to be tested.

[0019] After continuing to inject and pump water every day for 14 to 30 days, the plant density of vegetation seedlings in different groups was counted, and the ratio of the plant density when the bottom bed elevation changed to the plant density when the bottom bed elevation did not change was calculated to obtain the relative change parameter of plant density.

[0020] Preferably, the stepping up of the water injection and pumping device comprises setting up 6 steps in the water injection and pumping device; obtaining the elevation change parameter of the tidal flat bottom bed to be measured and the relative change parameter of the plant density for each step;

[0021] The flooding time of the six steps is 100%, 74%, 56%, 37%, 19% and 5% respectively.

[0022] Preferably, in said II, the method for constructing the model includes fitting the relative change parameters of plant density and bottom elevation change parameters of the tidal flat to be tested under flooding conditions using a quadratic polynomial.

[0023] Preferably, the plant height of the vegetation seedlings is greater than 1 cm; the vegetation seedlings include Suaeda salsa seedlings.

[0024] The present invention also provides the application of the analysis method described in the above technical solution in evaluating the colonization and / or survival of tidal flat vegetation.

[0025] The present invention also provides a method for parameterized assessment of tidal flat vegetation colonization and / or survival, comprising the following (1) and / or (2):

[0026] (1): Obtain the tidal flat flooding time parameter, substitute it into the dynamic geomorphic threshold model of tidal flat vegetation colonization, and obtain the tidal flat vegetation colonization assessment result; the dynamic geomorphic threshold model of tidal flat vegetation colonization is the dynamic geomorphic threshold model of tidal flat vegetation colonization obtained by the analysis method described in the above technical solution;

[0027] (2): Obtain the elevation change parameters of the tidal flat bottom, substitute them into the dynamic geomorphological threshold model of tidal flat vegetation survival, and obtain the tidal flat vegetation survival assessment result; the dynamic geomorphological threshold model of tidal flat vegetation survival is the dynamic geomorphological threshold model of tidal flat vegetation survival obtained by the analysis method described in the above technical solution.

[0028] Beneficial effects:

[0029] The present invention provides a method for analyzing the dynamic geomorphic thresholds for tidal flat vegetation establishment and survival, comprising the following steps I and / or II: I: obtaining the flooding time parameters of the tidal flat to be tested and the plant density parameters at different flooding times, and constructing a model to obtain a dynamic geomorphic threshold model for tidal flat vegetation establishment; II: obtaining the bed elevation change parameters and the relative change parameters of the plant density of the tidal flat to be tested under flooding conditions, and constructing a model to obtain a dynamic geomorphic threshold model for tidal flat vegetation survival. Since tidal flat vegetation growth is primarily controlled by flooding and changes in the tidal flat bed elevation, the present invention obtains the plant density parameters at different flooding time parameters for the tidal flat to be tested and establishes a dynamic geomorphic threshold model for tidal flat vegetation establishment, which can systematically characterize the impact of flooding on vegetation establishment; and obtains the bed elevation change parameters and the relative change parameters of the plant density of the tidal flat to be tested under flooding conditions and establishes a dynamic geomorphic threshold model for tidal flat vegetation survival, which can systematically characterize the impact of local geomorphic changes (sediment elevation) on vegetation survival. Furthermore, the present invention establishes a fitting curve based on the obtained parameter results, which can realize the parametric analysis of tidal flat vegetation colonization and survival. This invention can provide a reference for tidal flat wetland ecological restoration work. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below.

[0031] Figure 1 This is a diagram showing the layout of the test pool and planting trough in Example 1;

[0032] Figure 2 This is a diagram showing the statistical results of the number of vegetation in the No. 1 pool in Example 1;

[0033] Figure 3 This is the statistical result of the number of vegetation in the second pool in Example 1

[0034] Figure 4 This is a graph showing the relationship between the flooding time of Suaeda salsa seeds and their planting density in Example 1;

[0035] Figure 5 This is a relationship diagram between the relative change in vegetation density and elevation change at 5% of the flooding time in Example 1;

[0036] Figure 6 This is a relationship diagram between the relative change in vegetation density and the change in elevation at 19% of the flooding time in Example 1;

[0037] Figure 7 This is a relationship diagram between the relative change in vegetation density and the change in elevation at 37% of the flooding time in Example 1;

[0038] Figure 8 This is a relationship diagram between the relative change in vegetation density and elevation change at 56% of the flooding time in Example 1. DETAILED DESCRIPTION

[0039] The present invention provides a method for analyzing the dynamic geomorphic thresholds of tidal flat vegetation colonization and survival, including the following I and / or II:

[0040] I: Obtain the flooding time parameters of the tidal flat to be tested and the plant density parameters under different flooding times, and construct a model to obtain the dynamic geomorphic threshold model of tidal flat vegetation colonization;

[0041] II: Obtain the parameters of the change in bottom elevation and relative change in plant density of the tidal flat to be tested under flooding conditions, and construct a model to obtain the dynamic geomorphological threshold model for the survival of tidal flat vegetation.

[0042] The present invention obtains the flooding time parameter of the tidal flat to be measured and the plant density parameter at different flooding times. As an embodiment, the method of obtaining the flooding time parameter of the tidal flat to be measured and the plant density parameter at different flooding times of the present invention includes the following steps: setting six steps in a water injection and pumping device, each step being provided with a planting element containing the consolidated bottom mud of the tidal flat to be measured; sowing vegetation seeds in the planting elements, and injecting and pumping water every day so that the flooding time of the six steps in the water injection and pumping device is 100%, 74%, 56%, 37%, 19%, and 5%, respectively, to obtain the flooding time parameter of the tidal flat to be measured; the height of the consolidated bottom mud of the tidal flat to be measured is the same on each step; 7 to 14 days after sowing, the plant density in the planting elements on different steps is counted to obtain the plant density parameters at different flooding times. Since the growth of vegetation on site is mainly controlled by the duration of flooding, in the present invention, due to the setting of different steps, with the help of a water injection and pumping device, the periodic fluctuation of the water level in the water injection and pumping device can be achieved. The flooding time of vegetation planting units at different elevations is significantly different, which can further characterize the impact of flooding on vegetation colonization.

[0043] As an embodiment, the present invention takes the lower surface of the water injection and pumping device as the initial height, and the initial height is recorded as 0.0 cm. The heights of the 6 steps from low to high are 0.0 cm, 11.0 cm, 18.0 cm, 25.5 cm, 33.0 cm and 40.5 cm, respectively. The present invention has no strict requirements on the specific structure of the water injection and pumping device. It can control the water level change to meet the flooding time of different steps and simulate the flooding of the tidal flat to be tested. For example, it can be a pool equipped with a water level sensor and a submersible pump. In the present invention, the time of the water injection and pumping 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 time when the vegetation seeds are flooded in one day.

[0044] In one embodiment, the height of the planting element of the present invention is 4.5 cm. In one embodiment, the dimensions of the planting element of the present invention are (30-50) x (20-40) cm. In one embodiment, the dimensions of the planting element of the present invention are 30 x 20 cm. In one embodiment, the planting element of the present invention may be a planting trough.

[0045] As an embodiment, the vegetation seeds of the present invention include Suaeda salsa seeds. The present invention is described in the specific embodiments using Suaeda salsa seeds as an example, but this should not be understood as the entire protection scope of the present invention.

[0046] 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 tidal flat vegetation colonization. As an embodiment, the method for constructing the model described in the present invention includes fitting the plant density parameters and flooding time parameters under different flooding times using a logarithmic relationship. As an embodiment, the present invention uses the plant density under the condition of 5% flooding time as a benchmark to calculate the relative plant density under other flooding time conditions. The present invention has no strict requirements on the specific method of the fitting, and conventional operations in the field can be used.

[0047] As an embodiment, the dynamic landform threshold model of tidal flat vegetation colonization of the present invention is a fitting equation, and the fitting equation is y=1.2e -3.853x ; Among them, x is the flooding time of the tidal flat to be tested, unit is %; y is the relative plant density, unit is %.

[0048] The present invention obtains the parameters of the change in 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 embodiment, the method of obtaining the parameters of the change in 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 comprises the following steps: building a step in a water injection and pumping device, and setting a cultivation element equipped with the consolidated bottom mud of the tidal flat to be measured on the step; cultivating plant seedlings in the cultivation element, and simulating the flooding of the tidal flat to be measured by injecting and pumping water every day; after the plant seedlings on the step grow stably, they are randomly divided into 6 groups, and the initial bottom mud elevation of the plant seedlings in different groups is recorded as 0 cm, and no change is made. The sediment elevations for the same group of seedlings were +1 cm, +2 cm, 0 cm, -1 cm, -2 cm, and 0 cm, respectively, to obtain the test tidal flat bottom elevation change parameter. Water injection and pumping were continued daily to simulate flooding of the test tidal flat. After 14 to 30 days of daily water injection and pumping, the plant density of the different groups of seedlings was counted. The ratio of the plant density under the changed bottom elevation to the plant density under unchanged bottom elevation was calculated to obtain the relative plant density change parameter. Given the same flooding probability, on-site vegetation growth is primarily influenced by local topographic changes (sediment elevation). In this invention, different sediment elevations were set to further characterize the growth and survival of vegetation under different geomorphic disturbances.

[0049] As an embodiment, the present invention provides a step-by-step method within a water injection and pumping device, including providing six steps within the water injection and pumping device; obtaining a parameter for the elevation change of the tidal flat bottom and a parameter for the relative change of plant density for each step; and wherein the flooding durations of the six steps are, in order, 100%, 74%, 56%, 37%, 19%, and 5%. The method for establishing the flooding durations of the six steps as 100%, 74%, 56%, 37%, 19%, and 5% is consistent with the method previously described and is not further described here.

[0050] As an embodiment, the plant height of the plant seedlings of the present invention is greater than 1 cm. As an embodiment, the plant seedlings of the present invention include Suaeda salsa seedlings. As an embodiment, the plant seedlings of the present invention are plant seedlings obtained after natural germination in an outdoor open space. The present invention is described using Suaeda salsa seedlings as an example in the specific embodiments, but this should not be understood as the only protection scope of the present invention.

[0051] After obtaining the parameters for the change in bottom elevation and relative change in plant density of the tidal flat under flooding conditions, the present invention constructs a model to obtain a dynamic geomorphic threshold model for tidal flat vegetation survival. In one embodiment, the model construction method of the present invention includes fitting the parameters for the relative change in plant density and the parameters for the change in bottom elevation of the tidal flat under flooding conditions using a quadratic polynomial. The present invention does not strictly require the specific method of fitting, and conventional procedures in the art can be used.

[0052] As an embodiment, the dynamic geomorphological threshold model for the survival of tidal flat vegetation in the present invention is a fitting equation, and 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; x is the elevation change in meters; y is the relative plant density in percent.

[0053] As an embodiment, the tidal flat consolidated sediment of the present invention is the tidal flat sediment to be tested that is consolidated and stabilized under the action of its own weight.

[0054] The present invention obtains the parameters of the flooding time of the tidal flat to be tested and the parameters of the plant density under different flooding times, obtains the parameters of the elevation change of the bottom bed of the tidal flat to be tested and the parameters of the relative change of the plant density under flooding conditions, and constructs a model. The obtained dynamic geomorphic threshold model of tidal flat vegetation colonization and the dynamic geomorphic threshold model of tidal flat vegetation survival can evaluate the colonization and / or survival of tidal flat vegetation, and obtains a reasonable parameterized calculation method based on the analysis of the test results, which can play an important reference role in carrying out the restoration of native vegetation on the tidal flat. Therefore, the application of the analysis method described in the above technical solution in evaluating the colonization and / or survival of tidal flat vegetation also falls within the scope of protection of the present invention.

[0055] The present invention also provides a method for parameterized assessment of tidal flat vegetation colonization and / or survival, comprising the following (1) and / or (2):

[0056] (1): Obtain the tidal flat flooding time parameter, substitute it into the dynamic geomorphic threshold model of tidal flat vegetation colonization, and obtain the tidal flat vegetation colonization assessment result; the dynamic geomorphic threshold model of tidal flat vegetation colonization is the dynamic geomorphic threshold model of tidal flat vegetation colonization obtained by the analysis method described in the above technical solution;

[0057] (2): Obtain the elevation change parameters of the tidal flat bottom, substitute them into the dynamic geomorphological threshold model of tidal flat vegetation survival, and obtain the tidal flat vegetation survival assessment result; the dynamic geomorphological threshold model of tidal flat vegetation survival is the dynamic geomorphological threshold model of tidal flat vegetation survival obtained by the analysis method described in the above technical solution.

[0058] To further illustrate the present invention, a method for analyzing the dynamic geomorphic thresholds for the colonization and survival of tidal flat vegetation and its application provided by the present invention are described in detail below with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of protection of the present invention.

[0059] Example 1

[0060] The analysis method for the dynamic geomorphic thresholds of tidal flat vegetation colonization and survival is as follows:

[0061] 1. Collect the bottom mud of the actual tidal flat vegetation area and lay it flat in the laboratory vegetation planting trough. Let it stand for more than one week to allow it to consolidate and stabilize under its own weight.

[0062] 2. Follow Figure 1 Two adjacent test troughs (Pool No. 1 and Pool No. 2) were set up outdoors. Each test trough used brick stacking to form a slope to reflect the differences in elevation of the tidal flat. Each test trough had six steps based on the bottom of the test trough. The heights of steps 1 to 6 were 0.0 cm, 11.0 cm, 18.0 cm, 25.5 cm, 33.0 cm, and 40.5 cm, respectively. Planters filled with consolidated and stabilized bottom mud were placed on each step. The top elevations of the planters were 4.5 cm, 15.5 cm, 22.5 cm, 30.0 cm, 37.5 cm, and 45.0 cm, respectively. The planar dimensions of the planters on the first step were 50 cm × 40 cm. The planar dimensions of the planters on steps 2 to 6 were 30 cm × 20 cm. Two parallel steps were set.

[0063] 3. Water level sensors and submersible pumps were installed in each test tank to control water level fluctuations and simulate on-site tidal conditions. Based on the actual on-site tidal conditions, the submersible pump speed was controlled to lower the water level from its highest point to its lowest point over a six-hour period. When the water level in Test Tank No. 1 reached its lowest point, the water level in Test Tank No. 2 reached its highest point. At this point, water was pumped from Test Tank No. 2 to Test Tank No. 1, and this cycle continued to simulate on-site tidal fluctuations. Based on the saltwater duration, the flooding time for steps 1 to 6 was 100%, 74%, 56%, 37%, 19%, and 5%, respectively.

[0064] 4. Conduct a vegetation seed germination experiment. Sow Suaeda salsa seeds in the planting trough of the No. 1 experimental tank. Additionally, sow Suaeda salsa seeds in an outdoor planting trough for natural germination control. Maintain humidity in the planting trough at approximately 70% during the control treatment period.

[0065] 5. 7-14 days after sowing, transfer seedlings taller than 1 cm from the outdoor planting troughs to Tank No. 2 for further testing based on actual plant growth. Divide the seedlings into 36 groups of 100 plants each and plant them on the six slopes of Tank No. 2. This means there are six groups of seedlings on each step of Tank No. 2, with three groups of seedlings on the first parallel of each step and three groups of seedlings on the second parallel of each step of Tank No. 2.

[0066] 6. Seven days after transplanting, when vegetation growth had stabilized, the sediment elevation within each layer of the planting troughs in Reservoir No. 2 was artificially altered to investigate the impact of local topographic changes on the survival of the seedlings. The initial bottom elevation of each layer in Reservoir No. 2 was set to 0 cm. The three groups of seedlings in the first parallel layer (3-5) corresponded to the following experimental bottom elevations, from left to right: +1 cm, +2 cm, and 0 cm. The three groups of seedlings in the second parallel layer (3-5) corresponded to the following experimental bottom elevations, from left to right: -1 cm, -2 cm, and 0 cm.

[0067] 7. 14 to 30 days after transplanting, count the number of plants in the planting troughs in pools 1 and 2. The results are as follows: Figure 2 and 3 Calculate the plant density of the planting trough in 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 No. 1 pool, the group with 5% flooding time was used as the benchmark group, and the relative plant density under other flooding time conditions was calculated. The relative plant density and flooding time were fitted using a logarithmic relationship to obtain a parameterized calculation method for vegetation colonization. The results are as follows Figure 4As shown. Calculate the survival rate of the planting trough in the No. 2 pool. If the number of plants in the planting trough is n, the survival rate of the plants in the No. 2 pool is n / 100. Based on the test results of the No. 2 pool, the effect of local landform 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 plant density when the bottom bed elevation changes to the plant density when the bottom bed does not change. The relationship between the relative change of plant density and the change of bottom bed elevation can be fitted using a quadratic polynomial, and the results are shown in Figure 2. Figures 5 to 8 shown.

[0068] During the study of this example, the seedlings did not survive 74% of the time of flooding, so no statistics were made. Figures 2 to 8 It can be seen that there is a certain threshold for the effect of flooding duration on seedling survival rate. When flooding duration exceeds this threshold, seedling survival rate will drop significantly, and the impact will exceed the result of substrate siltation. When using the calculation formula, the influence of substrate changes at 0% flooding time and the relationship between seed flooding duration and seedling density can be considered to achieve the effect of comprehensively considering flooding duration and substrate changes.

[0069] Based on the above content, it can be seen that the method provided by the present invention can obtain the dynamic geomorphological thresholds for tidal flat vegetation colonization and survival, parameterize the evaluation of tidal flat vegetation colonization and survival, and provide a reference value for tidal flat wetland ecological restoration work.

[0070] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A method for analyzing the dynamic geomorphic thresholds of tidal flat vegetation colonization and survival, characterized in that: Including the following I and II: I: Obtain the flooding time parameters of the tidal flat to be tested and the plant density parameters under different flooding times, and construct a model to obtain the dynamic geomorphic threshold model of tidal flat vegetation colonization; II: Obtain the parameters of the change in bottom elevation and relative change in plant density of the tidal flat under flooding conditions, and construct a model to obtain the dynamic geomorphic threshold model for the survival of tidal flat vegetation; In the above-mentioned step I, the method for obtaining the flooding time parameter of the tidal flat to be measured and the plant density parameter under different flooding times comprises the following steps: Six steps are set up in the water injection and pumping device, and a planting element with the tidal flat consolidated bottom mud to be tested is set up on each step; Vegetation seeds are sown in the planting element, and water is injected and pumped out every day so that the flooding time of the six steps in the water injection and pumping device is 100%, 74%, 56%, 37%, 19% and 5% respectively, thereby obtaining the flooding time parameter of the tidal flat to be measured; the height of the consolidated bottom mud of the tidal flat to be measured is the same on each step; 7 to 14 days after sowing, the plant density in different step planting elements was counted to obtain the plant density parameters under different flooding times; In said Ⅰ, the method for constructing the model includes fitting the plant density parameter and the flooding time parameter under different flooding times by using a logarithmic relationship; In the above-mentioned II, the method for obtaining the elevation change parameters of the tidal flat bottom and the relative change parameters of the plant density under flooding conditions comprises the following steps: Building steps in the water injection and pumping device, and placing a cultivation element containing the tidal flat consolidated bottom mud to be tested on the steps; Planting plant seedlings in the cultivation element, and simulating flooding conditions of the tidal flat to be tested by injecting and pumping water every day; After the vegetation seedlings on the steps have grown stably, 6 groups are randomly divided. The initial bottom mud elevation of the vegetation seedlings in different groups is recorded as 0 cm. The bottom mud elevations of the vegetation seedlings in different groups are changed. 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, respectively, to obtain the elevation change parameters of the tidal flat to be tested. Water injection and pumping are continued every day to simulate the flooding of the tidal flat to be tested. After continuing to inject and pump water every day for 14 to 30 days, the plant density of vegetation seedlings in different groups was counted, and the ratio of the plant density when the bottom bed elevation changed to the plant density when the bottom bed elevation did not change was calculated to obtain the relative change parameter of plant density. In said II, the method for constructing the model includes fitting the relative change parameters of plant density and bottom elevation change parameters of the tidal flat to be tested under flooding conditions using a quadratic polynomial.

2. The analysis method according to claim 1, characterized in that In said Ⅰ, the vegetation seeds include Suaeda salsa seeds.

3. The analysis method according to claim 1, characterized in that In said II, said building steps in the water injection and pumping device includes setting 6 steps in the water injection and pumping device; obtaining the elevation change parameter of the tidal flat bottom bed to be measured and the relative change parameter of the plant density for each step; The flooding time of the six steps is 100%, 74%, 56%, 37%, 19% and 5% respectively.

4. The analysis method according to claim 1, characterized in that In said II, the plant height of the plant seedlings is greater than 1 cm; the plant seedlings include Suaeda salsa seedlings.

5. A method for parameterized assessment of tidal flat vegetation colonization and survival, characterized in that: These include (1) and (2): (1): Obtaining a tidal flat flooding time parameter, substituting it into a dynamic geomorphic threshold model of tidal flat vegetation colonization, and obtaining a tidal flat vegetation colonization assessment result; the dynamic geomorphic threshold model of tidal flat vegetation colonization is the dynamic geomorphic threshold model of tidal flat vegetation colonization obtained by the analysis method according to any one of claims 1 to 4; (2): Obtain the elevation change parameters of the tidal flat bottom, substitute them into the dynamic geomorphological threshold model of tidal flat vegetation survival, and obtain the tidal flat vegetation survival assessment result; the dynamic geomorphological threshold model of tidal flat vegetation survival is the dynamic geomorphological threshold model of tidal flat vegetation survival obtained by the analysis method according to any one of claims 1 to 4.

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