Method and system for quickly recovering needle and broad-leaved mixed forest in sub-high mangosteen shrub land and application

Abstract

The invention belongs to the technical field of coniferous and broad-leaved mixed forest recovery, and relates to a method, a device and equipment for recovering a coniferous and broad-leaved mixed forest in a sub-high mangosteen shrub land. According to the specific technical scheme, the method comprises the steps of obtaining stand structure parameters of a sub-high mangosteen shrub land to be recovered, calculating a bamboo layer inhibition dynamic factor according to the stand structure parameters, and determining a target recovery area according to the size of the bamboo layer inhibition dynamic factor; performing strip-shaped alternate cutting on the target recovery area to form a reserved strip and a target cutting strip which are alternately distributed; and determining the type and planting spacing of the target seedlings to be planted, implementing adaptive planting in the target clear cutting zone according to the determined type and planting spacing of the target seedlings, and implementing dynamic recovery intervention and monitoring evaluation on the target recovery area. Compared with a traditional recovery strategy, the method can accurately cope with the complex degeneration environment of the sub-high mangosteen shrub land, the recovery efficiency, the seedling survival rate and the growth performance are remarkably improved, and the bottleneck of poor adaptability in the prior art is broken through.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coniferous and broad-leaved mixed forest restoration, and particularly relates to a method and system for quantitatively evaluating and adaptively managing rapid restoration of coniferous and broad-leaved mixed forest in subalpine bamboo shrub land, and application thereof. BACKGROUND

[0002] Subalpine coniferous and broad-leaved mixed forest is an important habitat for rare and endangered animals such as giant pandas and red pandas. However, from the 1960s to the 1980s, in order to meet the needs of national construction and local economic development, the original subalpine coniferous forest with fir (Abies spp.) and hemlock (Tsuga spp.) as the main dominant tree species was logged on a large scale. Bamboo species such as Arundinaria faberi, Chimonobambusa opienensis, Yushania brevipaniculata, and Fargesia nitida rapidly expanded (bamboo coverage of more than 60%) and occupied the understory space, severely inhibiting the natural regeneration of trees, leading to the degradation of coniferous and broad-leaved mixed forest to bamboo shrub land, and causing a decline in habitat quality.

[0003] Existing technologies for restoring coniferous and broad-leaved mixed forest mainly focus on restoring the main food bamboo of giant pandas and attempting to promote the growth and survival of tree seedlings by improving the microhabitat of secondary shrub land, thereby accelerating the formation of coniferous and broad-leaved mixed forest.

[0004] However, the above-mentioned existing technologies do not address the problem of high-density bamboo competition in bamboo shrub land, lack dynamic evaluation and adaptive intervention means for bamboo competition intensity, and are difficult to adapt to complex environments with different bamboo coverage or degrees of degradation, which limits their promotion, i.e., on the one hand, traditional thinning and planting strategies are difficult to match the spatial heterogeneity of bamboo competition, resulting in low efficiency of coniferous and broad-leaved mixed forest restoration; on the other hand, there is a lack of dynamic intervention mechanisms centered on "competition intensity", making it difficult to adapt to changing degraded environments. Therefore, there is an urgent need for a method for restoring coniferous and broad-leaved mixed forest in subalpine bamboo shrub land to address the problems of low efficiency of coniferous and broad-leaved mixed forest restoration and difficulty in adapting to changing degraded environments. SUMMARY

[0005] To solve the above technical problems, the present application proposes a method, system and application for restoring coniferous and broad-leaved mixed forest in subalpine bamboo shrub land to solve the core technical problem that traditional restoration strategies are difficult to match the spatial heterogeneity of bamboo competition and lack dynamic intervention mechanisms centered on competition intensity.

[0006] The present application discloses a method for restoring coniferous and broad-leaved mixed forest in subalpine bamboo shrub land, comprising:

[0007] Step S101: Obtain the stand structure parameters of the sub-alpine bamboo shrub land to be restored, calculate a bamboo layer inhibition dynamic factor according to the stand structure parameters, and determine the target restoration region as a region where the bamboo layer inhibition dynamic factor is greater than a first preset threshold value;

[0008] Step S102: Implement strip-shaped alternate clear-cutting on the target restoration region to form alternately distributed reserved strips and target clear-cutting strips.

[0009] Step S103: Determine the target seedling type to be planted according to the initial bamboo coverage of the target restoration region, determine the planting interval of the target seedlings according to the size relationship between the bamboo layer inhibition dynamic factor and a second preset threshold value, and implement adaptive planting in the target clear-cutting strips according to the determined target seedling type and planting interval.

[0010] Step S104: Continuously monitor the bamboo coverage of the target clear-cutting strips as an intervention index, and implement a removal operation on the newly generated bamboo shoots when the monitored bamboo coverage is higher than a preset management threshold value, until the bamboo coverage is controlled within the preset management threshold value range.

[0011] Preferably, the stand structure parameters include bamboo coverage C, bamboo density D, and arbor seedling density S; and the bamboo layer inhibition dynamic factor calculation formula is as follows:

[0012] BSDF = [ln((C × D) / (S + 1) + 1)] × 200 + (1 - ΔC)

[0013] BSDF is the bamboo layer inhibition dynamic factor, and ΔC is the estimated bamboo coverage change rate after clear-cutting. For example, the calculation formula of ΔC can be as follows:

[0014] ΔC = λ × D × (C / 100)

[0015] λ is an empirical coefficient.

[0016] Preferably, the step S102: implementing strip-shaped alternate clear-cutting on the target restoration region to form alternately distributed reserved strips and target clear-cutting strips, includes:

[0017] The average height of bamboo in the target restoration region is set as the reserved strip width, and 1.5 times the average height is set as the clear-cutting strip width. The clear-cutting strips and the reserved strips are alternately arranged along the contour lines, and the bamboo plants in the clear-cutting strip range of the target restoration region are completely removed to obtain the target clear-cutting strips.

[0018] Preferably, the step S103: determining the target seedling type to be planted according to the initial bamboo coverage of the target restoration region, includes:

[0019] When the initial bamboo coverage is greater than or equal to the first reference value and less than or equal to the second reference value, the target seedling with a moderate competitive ability is selected;

[0020] When the initial bamboo coverage is greater than the second reference value, the target seedling with a strong competitive ability is selected.

[0021] Preferably, the step S103 comprises the following steps of:

[0022] When the bamboo layer inhibition dynamic factor is not greater than the second preset threshold value, the planting spacing of the target seedling is determined as the first spacing;

[0023] When the bamboo layer inhibition dynamic factor is greater than the second preset threshold value, the planting spacing of the target seedling is determined as the second spacing;

[0024] The first spacing is smaller than the second spacing.

[0025] Preferably, the step S103 comprises the following steps of: according to the determined target seedling category and planting spacing, adaptive planting is implemented in the target clear-cutting zone, and the coniferous trees, broad-leaved trees and shrubs are alternately planted in a 1:1:1 number ratio.

[0026] Preferably, the method further comprises evaluating the recovery effect of the target recovery area, and the evaluation indexes comprise the survival rate, growth rate and arbor layer coverage of the target seedling.

[0027] Correspondingly, the application further discloses a computer device / system, which comprises a memory, a processor and a computer program stored in the memory.

[0028] Correspondingly, the application further discloses a computer readable storage medium, which stores a computer program / instruction.

[0029] Correspondingly, the application further discloses a computer program product, which comprises a computer program / instruction.

[0030] The application has the following beneficial effects:

[0031] 1. This invention obtains key parameters such as bamboo canopy density, bamboo density, and arbor seedling density in the area to be restored, and substitutes them into a unique BSDF formula to achieve a spatial quantitative assessment of bamboo competition intensity. Based on the assessment results, this method can accurately select the target restoration area most in need of intervention; furthermore, it determines the suitable target seedling species based on the initial bamboo canopy density and the optimal planting spacing based on the BSDF value. This data-driven decision-making mechanism, which matches spatial heterogeneity, replaces the traditional "one-size-fits-all" clear-cutting and planting strategy.

[0032] 2. Following the intervention, this method also introduces a closed-loop adaptive management system. By continuously monitoring bamboo cover within the clear-cut zone and triggering and repeating the removal of new bamboo shoots as needed based on whether it exceeds a preset threshold, a dynamic intervention mechanism centered on competition intensity is established. Compared to traditional restoration strategies, this method can precisely address the complex degraded environment of subalpine bamboo shrublands, significantly improving restoration efficiency, seedling survival rate, and growth performance, overcoming the bottleneck of poor adaptability in existing technologies. Through this combination of precise intervention and dynamic tending, this method can effectively restore the initial structure of mixed coniferous and broad-leaved forests within 3-5 years, creating favorable conditions for the continuous improvement of ecosystem functions and the natural succession of the community. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of a method for restoring mixed coniferous and broad-leaved forests in subalpine bamboo shrubland is shown.

[0035] Figure 2 A schematic diagram of a restoration framework structure for coniferous and broad-leaved mixed forests in subalpine bamboo shrubland is shown.

[0036] Figure 3 A schematic diagram of a restoration device for mixed coniferous and broad-leaved forests in subalpine bamboo shrubland is shown. Detailed Implementation

[0037] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] Firstly, the terms involved in the present application are explained:

[0039] Dynamic strip thinning: refers to setting the width of the clear-cutting strip and the width of the reserved strip according to the average height H of bamboo, for example, the width of the clear-cutting strip is 1.5 times the height H, and the width of the reserved strip is the height H, and the strip arrangement is implemented along the contour direction.

[0040] Bamboo gap dynamic planting strip: refers to a single-row planting strip arranged along the center line in the clear-cutting strip, which can have a width of, for example, 1 m, and the planting point spacing is dynamically set according to the BSDF value (for example, 2.5 m when BSDF>1100, otherwise 2 m), aiming to optimize the allocation of light and space resources.

[0041] Referring to Figure 1 The present application provides a method for restoring a subalpine bamboo shrub land needle-broad mixed forest, comprising the following steps:

[0042] Step S101: Investigate and evaluate the area to be restored: investigate the subalpine bamboo shrub land to be restored, obtain its stand structure parameters, calculate the bamboo layer inhibition dynamic factor according to the stand structure parameters, and determine the area as a target restoration area when the bamboo layer inhibition dynamic factor is greater than a first preset threshold.

[0043] The stand structure parameters include bamboo coverage C (%), bamboo density D (plants / m 2 ) and tree seedling density S (plants / m 2 ). The bamboo coverage represents the degree of bamboo shading to the ground light, the bamboo density reflects the number of bamboo poles per unit area, and the tree seedling density is used to reflect the tree regeneration capacity.

[0044] Optionally, the method for obtaining the stand structure parameters is as follows: in July to August every year, a quadrat of 10m x 10m is set in the bamboo shrub area, and the bamboo coverage, bamboo density and tree seedling density of the quadrat are measured on site.

[0045] Specifically, the bamboo layer inhibition dynamic factor formula is as follows:

[0046] BSDF = [ln((C x D) / (S+1)+1)] x 200 + (1-AC)

[0047] Wherein, BSDF is the bamboo layer suppression dynamic factor, C is the bamboo coverage, D is the bamboo density, S is the arbor seedling density, and AC is the estimated bamboo coverage change rate after clear cutting.

[0048] In the above-mentioned bamboo layer suppression dynamic factor formula, [ln((CxD) / (S+1)+1)]x200 is used to reflect the static competition suppression intensity of bamboo on the growth of arbor seedling; (CxD) represents the light shading pressure and density of bamboo; (S+1) introduces the arbor seedling regeneration capacity and avoids the problem of division by zero, and the natural logarithm can enhance the response sensitivity of the input variable to the factor; multiplied by 200 to enhance the discrimination of the index; the latter term (1-AC) in the formula is a dynamic correction coefficient, which is used to correct the risk of overestimating the competition intensity caused by calculating based on only static structural parameters, thereby enhancing the adaptability and prediction accuracy of the BSDF evaluation model to the response of actual ecological intervention.

[0049] The calculation formula of AC may be, for example:

[0050] AC = λxDx(C / 100)

[0051] Wherein, λ is an empirical coefficient. For example, based on the analysis results of the measured data of 20 10m x 10m sample plots in Daxiangling region of Sichuan, λ = 0.0255, which means that under the assumption of complete shading, the reduction of 1 plant / m 2 will result in a reduction of about 2.55% in bamboo coverage.

[0052] Alternatively, to adapt to the needs of different restoration scenarios, different classification thresholds can be set based on the correspondence between the BSDF value and the field community structure survey results. For example, based on the measured data in Daxiangling region of Sichuan, it is shown that when BSDF > 900, the comprehensive competition pressure of bamboo in this region has almost stopped the natural regeneration process of arbor seedlings, and this value can be set as the first preset threshold for screening the target restoration area; when BSDF > 1100, the competition pressure is extremely large, and it is recommended to adjust the planting spacing from 2m to 2.5m, and this value can be set as the second preset threshold for adjusting the planting spacing.

[0053] It should be noted that the above-mentioned classification threshold is applicable to subalpine bamboo shrub land with Phyllostachys nidularius and Phyllostachys nigra as the main dominant species, and has good adaptability when the bamboo coverage is in the range of 60%-90%. For areas with bamboo coverage exceeding 90%, it is recommended to fine-tune the empirical coefficient λ and each classification decision threshold in combination with field measurement data. For areas with bamboo coverage less than 60%, since the natural regeneration capacity of arbor seedlings is strong, additional intervention measures are usually not needed.

[0054] Finally, the calculated BSDF value is compared with the first preset threshold (e.g. 900), and when the BSDF value is greater than 900, the area is determined as the target restoration area.

[0055] Step S102: Implementing strip-shaped alternating clear-cutting on the target restoration area: obtaining the average height value of the bamboo in the target restoration area (e.g. 1-3m), setting the average height value as the width of the reserved strip, and setting 1.5 times the average height value as the width of the clear-cutting strip (e.g. 1.5-4.5m); alternatingly arranging the clear-cutting strip and the reserved strip along the contour line direction, and completely removing the bamboo plants in the clear-cutting strip of the target restoration area to obtain the target clear-cutting strip.

[0056] Optionally, the clear-cutting treatment can be implemented in September-October of the current year or March-April of the next year.

[0057] It is not difficult to understand that this step aims to ensure that the light penetration rate in the clear-cutting strip is increased to more than 50%, providing a good light environment for the growth of the target seedlings planted, and the reserved strip maintains the original vegetation structure to maintain ecological stability.

[0058] Step S103: Adaptive planting in the target clear-cutting strip: arranging a bamboo gap dynamic planting strip along the center line of the target clear-cutting strip, and planting target seedlings in the bamboo gap dynamic planting strip according to the results of the previous evaluation decision.

[0059] Specifically, the planting treatment includes:

[0060] Step S1031: Determining the species: determining the species of the target seedlings according to the initial bamboo coverage of the target restoration area, and this determination step is only applicable to the area with an initial bamboo coverage of not less than 60%. For example, the first reference value is set to 60%, and the second reference value is set to 80%. When the initial bamboo coverage is not less than 60% and not more than 80%, the species of the target seedlings is determined as a species with moderate competitive ability, such as Picea brachytyla, Cercidiphyllum japonicum, and Cotoneaster moupinensis; when the bamboo coverage is greater than 80%, the species of the target seedlings is determined as a strong shade-tolerant or competitive species, such as Abies fargesii, Sorbus hupehensis, and Loniceratangutica.

[0061] It should be noted that for the area with a bamboo coverage of less than 60%, the natural regeneration ability of the tree seedlings is strong, and the ecosystem has self-restoration potential, so no additional intervention measures are needed.

[0062] Step S1032: determining the spacing: determining the planting spacing according to the BSDF value. When the BSDF value is not greater than a second preset threshold (for example, 1100), it is determined that the planting spacing of the target seedling is a first spacing (2 m); when the BSDF value is greater than the second preset threshold, it is determined that the planting spacing of the target seedling is a second spacing (2.5 m).

[0063] Step S1033: the coniferous trees, broad-leaved trees and shrubs are planted alternately in a ratio of 1:1:1. Specifically, the alternation mode can be that the coniferous trees, the broad-leaved trees and the shrubs are planted in sequence along the center line of the dynamic planting belt in the sequence of “coniferous trees-broad-leaved trees-shrubs”.

[0064] Optionally, the planting hole specification can be, for example, 40 cm x 40 cm x 30 cm, the target seedling height can be, for example, 0.6-1.2 m, and the planting time can be, for example, after the soil is thawed in spring.

[0065] Step S104: implementing dynamic restoration intervention and monitoring and evaluation: in order to realize scientific evaluation of the restoration effect and adaptive management of the dynamic intervention, the target restoration area is continuously monitored.

[0066] The monitoring includes the following two aspects:

[0067] Restoration effect evaluation: the survival rate, tree height growth rate, ground diameter growth rate and tree layer coverage of the target seedling are regularly investigated, which is used to evaluate the medium and long term effectiveness of the restoration strategy.

[0068] Dynamic restoration intervention: the bamboo coverage of the target clear-cutting belt is taken as the key reference index for immediate intervention. The core of the intervention is that when the bamboo coverage is higher than a preset threshold (for example, 5%), the newly born bamboo shoots are immediately removed, and the operation is repeated according to the subsequent monitoring feedback as needed until the bamboo coverage is stably controlled within the preset threshold range, which is regarded as the completion of the dynamic restoration intervention.

[0069] Optionally, in order to maximize the consumption of underground rhizome nutrients of bamboo, the removal operation should be carried out from the peak period of the emergence of the newly born bamboo shoots to the end of the growth index period. For example, for March bamboo (the shooting period is 4-5 months), the removal operation can be carried out in the middle and late May of each year. For bamboo species with a longer shooting period (the shooting period is 4-6 months), such as Sasa borealis, a twice removal strategy can be adopted: the first removal is carried out in the middle and late May, and the second supplemental removal can be carried out at the end of June to the beginning of July as needed. The whole removal period usually lasts for 3-5 years.

[0070] Further, based on the same inventive concept, the present application also provides a sub-alpine bamboo shrub land needle-broad mixed forest restoration device 300, see Figure 3 , comprising:

[0071] The data acquisition module 301 is configured to acquire stand structure parameters of the sub-alpine bamboo shrub land to be restored, the stand structure parameters including bamboo coverage, bamboo density and arbor seedling density;

[0072] The evaluation decision module 302 is configured to perform the following operations:

[0073] The stand structure parameters are substituted into a preset BSDF formula to calculate a BSDF value thereof;

[0074] The BSDF value is compared with a first preset threshold to determine whether the area is a target restoration area;

[0075] Based on the initial bamboo coverage of the target restoration area, a target seedling species to be planted is determined;

[0076] The BSDF value is compared with a second preset threshold to determine a planting spacing of the target seedling;

[0077] The operation instruction generation module 303 is configured to generate and output a restoration operation instruction based on the determination and determination results of the evaluation decision module, the restoration operation instruction including:

[0078] The clear-cutting instruction is configured to: when an area is determined to be a target restoration area, instruct to set the widths of a reserved strip and a clear-cutting strip according to the average height of bamboos in the area and 1.5 times the average height, and instruct to alternately arrange the reserved strip and the clear-cutting strip along the contour lines of the terrain and remove all bamboos in the clear-cutting strip;

[0079] The planting instruction is configured to: instruct to arrange a bamboo gap dynamic planting strip along the center line of the target clear-cutting strip, and implement planting of the target seedling according to the determined target seedling species, the planting spacing and a preset 1:1:1 quantity ratio;

[0080] The monitoring and management instruction is configured to instruct to perform operations including restoration effect evaluation and dynamic restoration intervention: on one hand, instruct to periodically monitor the survival rate, growth rate and arbor layer coverage of the target seedling for scientific evaluation of restoration effectiveness; on the other hand, instruct to take the bamboo coverage of the target clear-cutting strip as an immediate intervention index, and trigger and repeatedly remove new bamboo shoots as needed when the coverage is higher than a preset threshold, until the coverage is stably controlled within the preset threshold range.

[0081] Further, based on the same inventive concept, the sub-alpine bamboo shrub land coniferous and broad-leaved mixed forest restoration device also includes a processor and a memory having a computer program executed by the processor stored thereon;

[0082] The processor implements the sub-alpine bamboo shrub land coniferous and broad-leaved mixed forest restoration method as described when executing the computer program stored in the memory.

[0083] Optionally, the memory can be independent or integrated with the processor. When the memory is independently arranged, the electronic device can further include a bus for connecting the memory and the processor.

[0084] Further, based on the same inventive concept, another aspect of the embodiments of the present application also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the sub-alpine bamboo shrub land coniferous and broad-leaved mixed forest restoration method as described.

[0085] The computer readable storage medium can be included in the device or apparatus 300 described in the above embodiments; or it can exist independently and not be assembled into the device or apparatus.

[0086] Embodiment 1

[0087] In order to better support the feasibility and applicability of the method proposed in the present application, a specific field operation case is provided as follows:

[0088] Implementation site: secondary bamboo shrub land at an altitude of 2500m in Daxiangling, Sichuan, with the dominant bamboo species being San Yue Bamboo (average height 2m).

[0089] (1) Investigation, evaluation and decision-making

[0090] From July 15 to August 15, 2021, 10 10m x 10m quadrats were set up in the area to be restored to assess the competition intensity of bamboo. The investigation results show that the average bamboo coverage in this area is 65%, the average bamboo density is 24 plants / m 2 , and the average arbor seedling density is 0.1 plant / m 2 .

[0091] According to the BSDF formula provided in the present application, the estimated bamboo coverage change rate after clear cutting is calculated, ΔC, ΔC = 0.0255 x 24 x (65 / 100) = 0.3978, and then all parameters are brought into the complete formula to calculate the BSDF value of this area, which is 1652.18.

[0092] Based on the evaluation results, the restoration decision is made as follows:

[0093] Region selection: since the BSDF value 1652.18 is greater than the first preset threshold 900, it is determined that the bamboo competition inhibition effect is strong, which meets the screening standard of the target restoration area.

[0094] Species selection: Since the initial average bamboo coverage of the area is 65%, which is within the interval of 60%-80%, it is recommended to plant species with moderate competition ability.

[0095] Spacing determination: Since the BSDF value 1652.18 is greater than the second preset threshold 1100, it is determined that the future competition pressure of the area is extremely great, and the planting point spacing is set to 2.5m, which is relatively wide.

[0096] (2) Implementing strip-shaped alternating clear-cutting

[0097] From April 1 to April 15, 2022, in the aforementioned selected target restoration area, according to the average height of bamboo in March 2m, the clear-cutting strip width is set to 1.5 times the bamboo height, i.e. 3m, and the reserved strip width is 2m. The clear-cutting operation is carried out along the contour direction, and after the operation is completed, the measured understory light penetration rate in the clear-cutting strip is increased from the original 30% to 52%, which creates favorable conditions for the growth of target seedlings.

[0098] (3) Implementing adaptive planting

[0099] From April 15 to April 30, 2022, a bamboo gap dynamic planting strip with a width of 1m is set at the center line position of the clear-cutting strip. The recommended native target tree species are used for planting, which specifically includes:

[0100] Needle-leaved trees: Maizhaoyunshan, 5 years old, crown width 0.5-0.8m, seedling height 0.6-0.7m;

[0101] Broad-leaved trees: Lianxiangshu, 5 years old, crown width 0.5-0.8m, seedling height 0.8-1.0m;

[0102] Shrubs: Baohxingcengzi, 5 years old, crown width 0.3-0.5m, seedling height 0.6-0.7m.

[0103] The planting configuration strictly follows the "needle-leaved tree-broad-leaved tree-shrub" alternating sequence of 1:1:1, and is arranged along the center line of the bamboo gap planting strip: starting from one end, one Maizhaoyunshan is planted at the first planting point, one Lianxiangshu is planted at the second planting point (2.5m apart), one Baohxingcengzi is planted at the third planting point, and one Maizhaoyunshan is planted at the fourth planting point, and so on. All seedling planting holes are 40cm x 40cm x 30cm in size.

[0104] (4) Regular tending and effectiveness monitoring

[0105] From 2022 to 2024, according to the bamboo shoot period (April-May) and the "maximize consumption" principle, the newly born bamboo shoots in the clear-cutting strip are removed in the middle and late May of each year, and regular tending management is carried out for 3 years.

[0106] By the end of the final monitoring on August 15, 2024, the results showed that the survival rate of the target seedlings planted was as high as 95%, and the bamboo coverage in the clear-cutting zone was successfully and stably controlled below 5%, reaching the completion standard of dynamic restoration intervention. This example fully verifies the applicability and high efficiency of the method in the restoration of coniferous and broad-leaved mixed forest in subalpine bamboo shrub land.

[0107] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for restoring subalpine bamboo shrubland mixed coniferous and broad-leaved forests, characterized in that, include: Step S101: Obtain the stand structure parameters of the subalpine bamboo shrubland to be restored, calculate the bamboo layer inhibition dynamic factor based on the stand structure parameters, and determine the area as the target restoration area when the bamboo layer inhibition dynamic factor is greater than the first preset threshold. Step S102: Perform alternating clear-cutting in strips on the target recovery area to form alternating retention zones and target clear-cutting zones; Step S103: Determine the target seedling species to be planted based on the initial bamboo cover of the target recovery area; determine the planting spacing of the target seedlings based on the relationship between the bamboo layer inhibition dynamic factor and the second preset threshold. Within the target clear-cutting zone, adaptive planting is carried out according to the determined target seedling species and planting spacing; Step S104: Continuously monitor the bamboo cover degree of the target clear-cutting zone as an intervention indicator, and remove new bamboo shoots when the monitored bamboo cover degree is higher than the preset management threshold until the bamboo cover degree is controlled within the preset management threshold range.

2. The method for restoring subalpine bamboo shrubland mixed coniferous and broad-leaved forests according to claim 1, characterized in that, The forest stand structure parameters include bamboo cover C, bamboo density D, and arbor seedling density S; the calculation formula for the bamboo layer inhibition dynamic factor is as follows: BSDF=[ln((C×D) / (S+1)+1)]×200+(1-ΔC) BSDF is the bamboo layer inhibition dynamic factor, and ΔC is the estimated rate of change in bamboo cover after clear-cutting. The formula for calculating ΔC is: ΔC = λ × D × (C / 100) λ is an empirical coefficient.

3. The method for restoring subalpine bamboo shrubland mixed coniferous and broad-leaved forests according to claim 1, characterized in that, Step S102: Perform alternating clear-cutting in strips on the target recovery area to form alternating preservation zones and target clear-cutting zones, including: The average height of bamboo in the target restoration area is set as the width of the retention zone, and 1.5 times the average height is set as the width of the clear-cutting zone. Clear-cutting zones and retention zones are alternately laid out along the contour lines of the terrain. All bamboo plants within the clear-cutting zone of the target restoration area are removed to obtain the target clear-cutting zone.

4. The method for restoring subalpine bamboo shrubland mixed coniferous and broad-leaved forests according to claim 1, characterized in that, Step S103: Based on the initial bamboo canopy density of the target restoration area, determine the target seedling species to be planted, including: When the initial bamboo canopy density is greater than or equal to the first reference value and less than or equal to the second reference value, select target seedlings with moderate competitiveness. When the initial bamboo canopy density is greater than the second reference value, select target seedlings with strong resistance to competition.

5. The method for restoring subalpine bamboo shrubland mixed coniferous and broad-leaved forests according to claim 4, characterized in that, Step S103: Determining the planting spacing of the target seedlings based on the relationship between the bamboo layer inhibition dynamic factor and the second preset threshold, including: When the bamboo layer inhibition dynamic factor is not greater than the second preset threshold, the planting spacing of the target seedlings is determined as the first spacing; When the bamboo layer inhibition dynamic factor is greater than the second preset threshold, the planting spacing of the target seedlings is determined as the second spacing; The first spacing is smaller than the second spacing.

6. The method for restoring subalpine bamboo shrubland mixed coniferous and broad-leaved forests according to claim 5, characterized in that, Step S103: Within the target clear-cutting zone, adaptive planting is carried out according to the determined target seedling species and planting spacing, including alternating planting of coniferous trees, broad-leaved trees and shrubs in a 1:1:1 ratio.

7. The method for restoring subalpine bamboo shrubland mixed coniferous and broad-leaved forests according to claim 1, characterized in that, The method also includes evaluating the restoration effect of the target restoration area, and the evaluation indicators include the survival rate, growth rate and tree cover of the target seedlings.

8. A computer device / equipment / system, characterized in that: It includes a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method as claimed in any one of claims 1-7.

9. A computer-readable storage medium, characterized in that: It stores a computer program / instruction thereon, which, when executed by a processor, implements the steps of the method as described in any one of claims 1-7.

10. A computer program product, characterized in that: Includes a computer program / instructions that, when executed by a processor, implement the steps of the method as described in any one of claims 1-7.

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