Method for determining bamboo forest cultivation target by using canopy density of upper-layer arbor vegetation type

Abstract

The embodiment of the invention provides a method for determining a bamboo forest cultivation target by using the canopy density of an upper-layer arbor vegetation type, and relates to the technical field of forestry, the method comprises the following steps: evaluating growth related indexes of square bamboos planted under different vegetation types under different site conditions, and determining the bamboo forest cultivation target according to an evaluation result. And in combination with related cutting technical regulations, allowing the corresponding forest category, the forest origin and the forest species to be adjusted to an upper-layer arbor closing range, and determining an under-forest bamboo cultivation target of the corresponding forest category, the forest species and the origin under each site condition. And according to the determined square bamboo cultivation target, in combination with factors such as forest category, forest species and origin, cultivation site screening can be assisted, so that a scientific basis is provided for bamboo industry development planning.

Description

Technical Field

[0001] The present invention relates to the technical field of forestry. Specifically, it relates to a method for determining the cultivation target of bamboo forests by using the canopy density of upper-layer arbor vegetation types. Background Technique

[0002] The cultivation targets of bamboo forests are diverse. Like arbor forests, bamboo forests have ecological, economic, and ecological benefits. They can be managed as timber forests, economic forests, fuelwood forests (energy forests), or as protective forests and special-purpose forests. The cultivation targets of bamboo forests can be divided into three different types: bamboo shoot forests, timber bamboo forests, and bamboo shoot-timber dual-purpose bamboo forests. In the current development of forestry, especially under the background of increasingly strict cultivated land protection, strong promotion of the development of forest-based economy, and the realization of high-quality forestry development, there is an urgent need to expand the development space. With the development of the bamboo industry and the exploitation of underforest resources, how to plan the development of the bamboo industry under the forest, especially how to scientifically determine whether to cultivate bamboo shoot bamboo, timber bamboo, or bamboo shoot-timber dual-purpose bamboo in the construction of the bamboo industry in the afforestation plot, is of great significance for achieving scientific management and sustainable development.

[0003] Zhaotong has put forward the development goal of "two million mu" of bamboo industry, among which: 1 million mu of "Fangzhu" and 1 million mu of Qiongzhu. Fangzhu refers to the general term of each bamboo species in the Fangzhu section of the genus Chimonobambusa. The growth of Fangzhu and Qiongzhu requires the shelter of upper-layer arbors, but it is not that the greater the canopy density of the upper-layer arbors is, the better, nor is it the smaller the better. It has a close relationship with the cultivation target. Different cultivation targets have different requirements for the canopy density of upper-layer arbors. Under the condition of basically the same site conditions, the canopy density of upper-layer arbors becomes the main factor affecting the economic target of "Fangzhu" under the forest. However, in the adjustment of the canopy density of upper-layer arbors, it is restricted by the logging policy and logging technical regulations. Therefore, it is necessary to establish an effective method to help determine the cultivation target of Fangzhu under the forest with corresponding forest categories, forest types, and origins under each site condition; or assist in screening the cultivation sites according to the determined cultivation target of Fangzhu, so as to provide a scientific basis for the development planning of the bamboo industry. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for determining the cultivation target of bamboo forests by using the canopy density of upper-layer arbor vegetation types, which is scientific, reasonable, and effective. It can give reasonable suggestions for the cultivation target of bamboo forests according to the canopy density of upper-layer arbor vegetation types, and provide a scientific basis for the development planning of the bamboo industry.

[0005] The embodiments of the present invention are implemented as follows:

[0006] A method for determining the cultivation target of bamboo forests by using the canopy density of upper-layer arbor vegetation types, which includes:

[0007] Select a plot with bamboo forests planted under the forest, divide the plot into several canopy density levels according to the canopy density of the upper-layer trees, and randomly select multiple samples in the areas corresponding to each canopy density level;

[0008] Investigate the growth indicators of each sample, conduct F-tests and Q-check analyses on the measurement results of the samples, and determine whether the areas corresponding to each canopy density level are suitable for bamboo forest planting according to the analysis results.

[0009] The beneficial effects of the embodiments of the present invention are:

[0010] The embodiments of the present invention provide a method for determining the bamboo forest cultivation target by using the canopy density of the upper-layer tree vegetation type. It evaluates by collecting the relevant indicators of the growth of Fangzhu bamboo already planted under different site conditions and different vegetation types of forests. According to the evaluation results, combined with the range of the upper-layer tree canopy density that the corresponding forest categories, forest origins, and forest types can be adjusted to allowed by the relevant logging technical regulations, determine the bamboo forest cultivation targets under each site condition in the forests of the corresponding forest categories, forest types, and origins. It is also possible to determine the bamboo cultivation targets, combined with factors such as forest categories, forest types, and origins, to assist in screening the cultivation sites, thereby providing a scientific basis for the development planning of the bamboo industry. Specific embodiments

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those not specified in the embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Those reagents or instruments not specified by the manufacturer can all be obtained as conventional products through commercial purchases.

[0012] The following specifically describes a method for determining the bamboo forest cultivation target by using the canopy density of the upper-layer tree vegetation type in the embodiments of the present invention.

[0013] A method for determining the bamboo forest cultivation target by using the canopy density of the upper-layer tree vegetation type includes:

[0014] Select a plot with bamboo forests planted under the forest, divide the plot into several canopy density levels according to the canopy density of the upper-layer trees, and randomly select multiple samples in the areas corresponding to each canopy density level;

[0015] Investigate the growth indicators of each sample, conduct F-tests and Q-check analyses on the measurement results of the samples, and determine whether the areas corresponding to each canopy density level are suitable for bamboo forest planting according to the analysis results.

[0016] Furthermore, select plots with basically the same site conditions and basically the same upper-layer tree vegetation type for analysis; the tree vegetation type includes at least one of coniferous forest, evergreen broad-leaved forest, coniferous and broad-leaved mixed forest, and deciduous broad-leaved forest.

[0017] Crown density is an important concept in forestry and ecology. It refers to the degree to which the tree crowns in a forest cover the ground, or the ratio of the projected area of the forest canopy layer to the forest land area. It is a value between 0 and 1, where 0 represents no shading and 1 represents complete shading. When dividing the crown density levels, the range from 0 to 1 can be equally divided into several intervals according to requirements. For example, when divided into 10 crown density levels, each 0.1 crown density interval can be one level; when divided into 5 crown density levels, each 0.2 crown density interval can be one level; in addition, it can also be divided into 3 crown density levels, with each 0.3 crown density interval as one level, namely 0 - 0.3, 0.3 - 0.6, 0.6 - 0.9. When the crown density is greater than 0.9, in most cases, it is not suitable for the growth of Chimonobambusa quadrangularis and can be ignored.

[0018] Optionally, the growth indicators include the number of bamboo shoots, the ground diameter of bamboo shoots, the number of bamboo plants, the height of bamboo plants, and the ground diameter of bamboo plants. More than 5 clusters or at least 3 quadrats are randomly selected within the area of each crown density level.

[0019] Furthermore, for the measurement results of each growth indicator, first, it is judged through F - test analysis. If the F - test result shows no significant difference, the growth indicator is determined to be most suitable at each crown density level; if the F - test result shows a significant difference, further Q - test analysis is carried out. F - test analysis can be performed using software such as Excel, SPSS17.0, etc. The calculated F - value is compared with the F - critical value (usually the F0.05 value). Data greater than the F - critical value have a significant difference, and data less than or equal to the F - critical value have no significant difference.

[0020] In the Q - test analysis, each growth indicator is analyzed separately; in the analysis of each growth indicator, the areas corresponding to all N crown density levels are sorted according to the measurement results from high to low, and the determination is made according to the following rules:

[0021] S1. If the measurement results of the N areas show no significant difference, the growth indicator is determined to be most suitable at all crown density levels; if the measurement result of a certain area shows a significant difference, then step S2 is carried out for determination;

[0022] S2. If the lowest - measurement - result area has no significant difference from A of the remaining N - 1 areas, the growth indicator is determined to be unsuitable at the lowest - measurement - result area and the crown density levels corresponding to the A areas; the remaining N - 1 - A areas are subjected to step S3 for determination;

[0023] S3. Among the remaining N - 1 - A regions, if there is no significant difference between the region with the highest measurement result and the remaining B regions, the growth index is determined to be most suitable at the canopy density levels corresponding to the highest region and the B regions; the remaining N - 1 - A - B regions are determined to be suitable.

[0024] In the above Q test, to determine whether there is a significant difference between two regions, the absolute value of the data difference between the two regions is compared with the Q critical value. If the absolute value of the data difference is greater than the Q critical value, it indicates that there is a significant difference in the data between the two regions; otherwise, there is no significant difference.

[0025] Optionally, the analysis results of each growth index within the regions corresponding to each canopy density level are quantified and summed. The result is determined to be most suitable and counted as 1 point, suitable and counted as 0.5 points, and not suitable and counted as 0 points. The suitability of the canopy density level for bamboo growth is judged by the sum score P.

[0026] When judging whether the canopy density level is suitable for bamboo growth by the sum score P, the calculated sum score P is compared with the theoretical maximum value P max of the sum score P. When P ≥ 0.8 * P max , it is determined to be most suitable; when 0.8 * P max >P ≥ 0.6 * P max , it is determined to be suitable; when P < 0.6 * P max , it is determined to be not suitable.

[0027] Furthermore, when the use of the bamboo forest is for both bamboo shoots and timber, the number of bamboo shoots, the diameter of bamboo shoots, the number of bamboos, the height of bamboos, and the diameter of bamboo stems are all factors to be considered. Therefore, the sum score P of the five growth indexes of the number of bamboo shoots, the diameter of bamboo shoots, the number of bamboos, the height of bamboos, and the diameter of bamboo stems is used for analysis and judgment.

[0028] When the use of the bamboo forest is for timber, the number of bamboos, the height of bamboos, and the diameter of bamboo stems are the main influencing factors. At this time, the sum score P1 of the three growth indexes of the number of bamboos, the height of bamboos, and the diameter of bamboo stems can be used to replace P for analysis and judgment.

[0029] When the use of the bamboo forest is for bamboo shoots, the number of bamboo shoots and the diameter of bamboo shoots are the main influencing factors. At this time, the sum score P2 of the two growth indexes of the number of bamboo shoots and the diameter of bamboo shoots can be used to replace P for analysis and judgment.

[0030] The features and performance of the present invention are further described in detail below in conjunction with embodiments.

[0031] Example 1

[0032] This embodiment provides a method for determining bamboo forest cultivation targets using the canopy density of upper tree vegetation types. The method is to select and evaluate the growth of velvety square bamboo under the tree forest in the Erxi Shuifu Tongluoba Bamboo Industry Professional Cooperative in Taiping Town, Shuifu City, Zhaotong City in 2024, to provide a basis for planting "square bamboo" in the Shuifu area and determining the cultivation targets under the same site conditions. This above-ground tree vegetation type is a natural evergreen and deciduous coniferous and broad-leaved mixed forest. Specifically, the following steps are included:

[0033] 1) The upper trees were divided into five canopy density levels (0-0.2, 0.2-0.4, 0.4-0.6, 0.6-0.8, 0.8-1). Ten clumps of P. velutipes were randomly selected for each canopy density level. The number of shoots, the ground diameter of the shoots, and the number, height, and ground diameter of the bamboos were investigated for each sample. The samples in the five canopy density levels were counted as five sample groups, A, B, C, D, and E. The measured canopy density of each group was as follows: A was 0.13; B was 0.26; C was 0.42; D was 0.7; and E was 0.92.

[0034] 2) The bamboo shoots diameter at ground level, bamboo diameter at ground level, number of shoots, number of bamboo plants and bamboo height of all samples were collected, and the data were processed using SPSS17.0 software. For the case of 5 sample groups with a total of 50 samples, the corresponding F critical value was F0.05(4,45)=2.575. After calculation, the F values of bamboo shoots diameter at ground level, bamboo diameter at ground level, number of shoots, number of bamboo plants and bamboo height were all greater than 2.575, indicating that the canopy density had a significant effect on bamboo shoots diameter at ground level, bamboo diameter at ground level, number of shoots, number of bamboo plants and bamboo height.

[0035] 3) The data is further Q tested, and the test results are shown in Tables 1 to 5. In the table, is the average value of data in a certain area, The data of plots A to E are average values, and “*” indicates that the data have significant differences.

[0036] Table 1. Bamboo shoots ground diameter Q test results

[0037]

[0038]

[0039] Table 2. Q test results of the number of bamboo shoots

[0040]

[0041] Table 3. Bamboo ground diameter Q test results

[0042]

[0043] Table 4. Q - test result table of bamboo height

[0044]

[0045] Table 5. Q - test result table of bamboo number

[0046]

[0047]

[0048] Based on the data in Table 1 - Table 5, judge the suitability of each growth index in this area.

[0049] Taking Table 1 as an example, judge according to the following rules:

[0050] S1. There are significant differences among the measurement results of the 5 areas, and proceed to step S2 for judgment;

[0051] S2. If there is no significant difference between the lowest area (Area E) of the measurement results and 0 of the remaining 4 areas (as can be seen from a column of data), then the growth index of bamboo shoot basal diameter is judged as unsuitable in the lowest area (Area E); proceed to step S3 for judgment on the remaining 4 areas;

[0052] S3. Among the remaining 4 areas, if there is no significant difference between the highest area (Area B) of the measurement results and the remaining 3 areas (as can be seen from the data in row B), then the growth index is judged as most suitable in the highest area (Area B) and the corresponding canopy density levels of the 3 areas; no area is judged as suitable.

[0053]

[0053] The data processing of Table 2 - Table 5 is carried out analogously.

[0054] 4) Quantify the analysis results of each growth index in the areas corresponding to each canopy density level respectively. Judge the result as 1 point for most suitable, 0.5 point for suitable, and 0 point for unsuitable. Judge whether the canopy density level is suitable for bamboo growth by summing the scores P, P1, and P2. The results are shown in Table 6.

[0055] Table 6. Scoring table of bamboo growth factors and cultivation target types

[0056]

[0057] 5) Compare the calculated sum score P with the theoretical maximum value P of the sum score P max When P ≥ 0.8 * P max , it is judged as most suitable; when 0.8 * P max >P ≥ 0.6 * P max , it is judged as suitable; when P < 0.6 * P maxWhen it is not suitable, the judgment result is shown in Table 7.

[0058] Table 7. Evaluation Results Table of Bamboo Growth Factors and Cultivation Target Types

[0059]

[0060] It can be seen from Table 7 that the suitable range of canopy density for planting under the villous Chimonobambusa quadrangularis forest is between 0.1 and 0.8. The most suitable range of canopy density for cultivating bamboo shoots under the forest is between 0.1 and 0.4. The most suitable range of canopy density for cultivating timber bamboo and bamboo shoots and timber bamboo under the forest is between 0.2 and 0.8. The evaluation results of this case are only applicable to the same site type and the same vegetation type as this case. On this premise, "Chimonobambusa quadrangularis" can be planned for planting within the canopy density range of 0.1 to 0.8. If the planned plot (sub-compartment) belongs to artificial commercial forest, bamboo shoot forests can be planned for cultivation; if the planned plot (sub-compartment) belongs to natural commercial forest, bamboo shoots and timber bamboo forests can be planned for cultivation; if the planned plot (sub-compartment) belongs to public welfare forest (protection forest in public welfare forest), it can be planned as bamboo shoot forest. It is not recommended to develop the bamboo industry in special use forests.

[0061] Example 2

[0062] This example provides a method for determining the bamboo forest cultivation target using the canopy density of the upper-layer tree vegetation type. The research location of this method is in the 19th villager group of Erxi Village, Taiping Town, Shuifu City. Erxi Village is located in the southwest of Shuifu City, adjacent to Yanjing Village in the east, Fuxing Village in the south, Banli Township, Suijiang County in the west, and Yanjin County in the north. It is 10.3 km long from north to south and 6.8 km wide from east to west. The total land area of the whole village is 65.5 km 2 . It belongs to subtropical climate, with an average annual precipitation of more than 1,200 mm, less sunshine, and the soil is mainly purple soil, with local yellow soil. The upper-layer trees are wild pecans and birches. The altitude of the test site is 1,375 - 1,385 m. The Chimonobambusa utilis was planted in winter 2018 and investigated in March 2021. The specific steps are as follows:

[0063] 1) Select Chimonobambusa utilis with canopy densities of 0.3, 0.6, and 0.9 for the upper-layer trees in the afforestation plot, set 30×30 m plots, and randomly select 5 clumps of Chimonobambusa utilis in each plot.

[0064] 2) Collect the bamboo shoot ground diameter, bamboo ground diameter, number of bamboo shoots, number of bamboo plants, and bamboo height of all samples, and use SPSS17.0 software to conduct F-test analysis on the data. For the situation of 3 sample groups and a total of 15 samples, the corresponding F critical value is F0.05(2, 12) = 3.89. After calculation, the F values of the bamboo shoot ground diameter, bamboo ground diameter, number of bamboo shoots, number of bamboo plants, and bamboo height are all less than 2.575, indicating that the canopy density has no significant effect on the bamboo shoot ground diameter, bamboo ground diameter, number of bamboo shoots, number of bamboo plants, and bamboo height, and no Q test is required.

[0065] The evaluation results of this embodiment are only applicable to the same site type and the same vegetation type as this case. On this premise, since the canopy density has no significant impact on the ground diameter of bamboo shoots, the ground diameter of bamboo, the number of bamboo shoots, the number of bamboo plants, and the height of bamboo, "Chimonobambusa quadrangularis" can be planned for planting between 0.1 and 0.9 of the canopy density. Whether it is commercial forest or protection forest in public welfare forest, bamboo forests for shoot use, bamboo forests for both shoot and timber use, and timber bamboo forests can be planned and cultivated. However, although the growth of bamboo forests is not significantly affected when the canopy density is 0.9, in special-purpose forests, due to logging restrictions, it is generally not allowed to be planned for the development of bamboo forests without approval.

[0066] Example 3

[0067] This embodiment provides a method for determining the cultivation target of bamboo forests by using the canopy density of upper-layer arbor vegetation types. The survey location of this method is in Wugu Village, Weixin County. The forest land area of this village is 2,580.56 hm 2 , of which the arbor forest land area is 1,445.78 hm 2 , accounting for 56.02% of the forest land area; the shrub forest land is 847.12 hm 2 , accounting for 32.83%. The average altitude in the area is 1,420 m, and it has a subtropical monsoon climate with distinct seasons. A total of 605 hm of Chimonobambusa utilis are planted under the forest in the whole village 2 . The survey plots are Chinese fir forests with different canopy densities. The soil layer thickness of the forest land is 30 - 40 cm, yellow loam, the slope aspect is northwest, and the altitude is between 1,427 and 1,516 m. The specific steps are as follows:

[0068] 1) Select Chinese fir forests with 5 canopy densities: 0.5, 0.6, 0.7, 0.8, 0.9, which are respectively denoted as A, B, C, D, E. Set plots under each Chinese fir forest with different canopy densities. In each plot, 5 clusters of Chimonobambusa utilis are randomly sampled, and the ground diameter and height of each Chimonobambusa utilis are measured one by one according to age; for newly emerged bamboo shoots, only the number of bamboo shoots is investigated, and the ground diameter of the bamboo shoots is measured one by one.

[0069] 2) Collect the ground diameter of bamboo shoots, the ground diameter of bamboo, the number of bamboo shoots, the number of bamboo plants, and the height of bamboo of all samples, and use SPSS17.0 software to process the data. For the case of 5 sample groups and a total of 50 samples, the corresponding F critical value is F0.05(4, 45) = 2.575. After calculation, the F values of the ground diameter of bamboo shoots, the ground diameter of bamboo, the number of bamboo shoots, the number of bamboo plants, and the height of bamboo are all greater than 2.575, indicating that the canopy density has a significant impact on the ground diameter of bamboo shoots, the ground diameter of bamboo, the number of bamboo shoots, the number of bamboo plants, and the height of bamboo.

[0070] 3) Further perform Q test on the data, and the test results are shown in Tables 8 - 12. In the table, is the data average value of a certain plot, The average values of the data for plots A - E respectively, with "*" indicating that the data has significant differences.

[0071] Table 8. Q - test results table for bamboo shoot basal diameter

[0072]

[0073] Table 9. Q - test results table for bamboo shoot emergence quantity

[0074]

[0075] Table 10. Q - test results table for bamboo basal diameter

[0076]

[0077]

[0078] Table 11. Q - test results table for bamboo height

[0079]

[0080] Table 12. Q - test results table for bamboo plant number

[0081]

[0082] Based on the data in Tables 8 - 12, judge the suitability of each growth index in this area. Taking Table 8 as an example, the judgment is made according to the following rules:

[0083] S1. There are significant differences among the measurement results of the 5 areas, and proceed to step S2 for judgment;

[0084] S2. The lowest - measured area (Area E) has no significant difference with 0 of the other 4 areas (as can be seen from a column of data), then the growth index of bamboo shoot basal diameter is judged as unsuitable in the lowest - measured area (Area E); the remaining 4 areas proceed to step S3 for judgment; S2. The lowest - measured area (Area E) has no significant difference with 0 of the other 4 areas (as can be seen from a column of data), then the growth index of bamboo shoot basal diameter is judged as unsuitable in the lowest - measured area (Area E); the remaining 4 areas proceed to step S3 for judgment;

[0085] S3. Among the remaining 4 areas, the highest - measured area (Area A) has no significant difference with the other 2 areas (Area B and Area C) (as can be seen from the data in row A), then the growth index is judged as most suitable under the canopy density levels corresponding to the highest - measured area (Area A) and the 2 areas (Area B and Area C); the remaining 1 area (Area D) is judged as suitable.

[0086] The data processing of Tables 9 - 12 follows the same analogy.

[0087] 4) Quantify the analysis results of each growth index within the corresponding area of each canopy density level. Determine the result as most suitable and count it as 1 point, suitable and count it as 0.5 point, and unsuitable and count it as 0 point. Judge whether the canopy density level is suitable for bamboo growth by summing the scores P, P1, and P2. The results are shown in Table 13.

[0088] Table 13. Scoring Table for Bamboo Growth Factors and Cultivation Target Types

[0089]

[0090] 5) Compare the calculated sum score P with the theoretical maximum value P max of the sum score P. When P ≥ 0.8 * P max , it is determined as most suitable; when 0.8 * P max >P ≥ 0.6 * P max , it is determined as suitable; when P < 0.6 * P max , it is determined as unsuitable. The determination results are shown in Table 14.

[0091] Table 14. Evaluation Result Table for Bamboo Growth Factors and Cultivation Target Types

[0092]

[0093] As can be seen from Table 7, when planting Chimonobambusa utilis var. emarginata under Chinese fir forest, with the upper-layer arbor canopy density between 0.5 and 0.6, it is suitable to manage Chimonobambusa utilis var. emarginata bamboo forests for shoot use, timber use, and both shoot and timber use; when the canopy density is 0.5, whether managing bamboo forests for shoot use, timber use, or both shoot and timber use under the forest is most suitable. At the same time, when the canopy density is 0.6, it is most suitable to manage bamboo forests for shoot use and both shoot and timber use under the forest. When the canopy density is 0.7 - 0.9, it is not suitable to manage bamboo forests with any target under the forest. Chinese fir belongs to evergreen tree species. Under the site conditions suitable for planting "Chimonobambusa utilis", when it comes to planting under evergreen tree species forests, the cultivation target planning of "Chimonobambusa utilis" can be carried out in combination with the above evaluation results according to the requirements of forest categories or forest types and origins in the logging policy and its corresponding logging technical regulations.

[0094] In summary, the embodiment of the present invention provides a method for determining the bamboo forest cultivation target using the canopy density of the upper-layer arbor vegetation type. It evaluates by collecting relevant indicators of the growth of Chimonobambusa utilis already planted under different site conditions and different vegetation types of forests. According to the evaluation results, in combination with the range of upper-layer arbor canopy density that the corresponding forest categories, forest origins, and forest types can be adjusted to permitted by relevant logging technical regulations, it determines the bamboo forest cultivation target of Chimonobambusa utilis under the corresponding forest categories, forest types, and origins of each site condition. It can also, in combination with factors such as forest categories, forest types, and origins, assist in screening cultivation locations based on the determined bamboo forest cultivation target, thereby providing a scientific basis for the development planning of the bamboo industry.

[0095] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for determining the cultivation target of bamboo forests by using the canopy density of upper-layer arbor vegetation types, characterized in that Including: Select a plot with bamboo forests planted under the forest. Divide the plot into several canopy density levels according to the canopy density of the upper-layer trees, and randomly select multiple samples in the areas corresponding to each canopy density level; Investigate the growth indicators of each sample, conduct F-test and Q-test analysis on the measurement results of the samples, and determine whether the areas corresponding to each canopy density level are suitable for bamboo forest planting according to the analysis results.

2. The method according to claim 1, wherein Select the plots with basically the same site conditions and basically the same upper-layer tree vegetation types for analysis; the tree vegetation types include at least one of coniferous forest, evergreen broad-leaved forest, coniferous and broad-leaved mixed forest, and deciduous broad-leaved forest.

3. The method according to claim 1, wherein The growth indicators include the number of bamboo shoots, the ground diameter of bamboo shoots, the number of bamboo plants, the height of bamboo plants, and the ground diameter of bamboo plants.

4. The method according to claim 3, wherein For the measurement results of each growth indicator, first judge through F-test analysis. If the F-test result shows no significant difference, the growth indicator is determined to be most suitable at each canopy density level; if the F-test result shows a significant difference, further Q-test analysis is carried out.

5. The method according to claim 4, characterized in that In the Q-test analysis, each growth indicator is analyzed separately; in the analysis of each growth indicator, the areas corresponding to all N canopy density levels are sorted according to the measurement results from high to low, and the determination is carried out according to the following rules: S1. If there is no significant difference in the measurement results of the N areas, the growth indicator is determined to be most suitable at all canopy density levels; if there is a significant difference in the measurement result of a certain area, go to step S2 for determination; S2. If there is no significant difference between the area with the lowest measurement result and A areas among the remaining N - 1 areas, the growth indicator is determined to be unsuitable at the canopy density levels corresponding to the lowest area and the A areas; the remaining N - 1 - A areas go to step S3 for determination; S3. Among the remaining N - 1 - A areas, if there is no significant difference between the area with the highest measurement result and B areas among the remaining areas, the growth indicator is determined to be most suitable at the canopy density levels corresponding to the highest area and the B areas; the remaining N - 1 - A - B areas are determined to be suitable.

6. The method according to claim 5, characterized in that Quantify and sum up the analysis results of each growth indicator in the areas corresponding to each canopy density level respectively. Record the result determined to be most suitable as 1 point, suitable as 0.5 point, and unsuitable as 0 point, and judge whether the canopy density level is suitable for bamboo forest growth through the sum score P.

7. The method according to claim 6, wherein When P ≥ 0.8 * P max it is determined to be most suitable; when 0.8 * P max > P ≥ 0.6 * P max it is determined to be suitable; when P < 0.6 * P max it is determined to be unsuitable; where P max is the theoretical maximum value of the summation score P.

8. The method according to claim 7, wherein When the use of the bamboo forest is for both bamboo shoots and timber, analyze and judge with the sum score P of the five growth indicators of the number of bamboo shoots, the ground diameter of bamboo shoots, the number of bamboo plants, the height of bamboo plants, and the ground diameter of bamboo plants.

9. The method according to claim 8, wherein When the use of the bamboo forest is for timber, use the sum score P1 of the three growth indicators of the number of bamboo plants, the height of bamboo plants, and the ground diameter of bamboo plants to replace P for analysis and judgment.

10. The method according to claim 8, wherein When the use of the bamboo forest is for bamboo shoots, use the sum score P2 of the two growth indicators of the number of bamboo shoots and the ground diameter of bamboo shoots to replace P for analysis and judgment.

Images