Method for repairing degraded moso bamboo forest soil

Abstract

The invention provides a method for repairing degraded moso bamboo forest soil. The method comprises the following steps: selecting a degraded moso bamboo forest; the moso bamboo forest is divided into a plurality of strip-shaped areas according to a high-density-low-density classification mode, and high-density areas and low-density areas which are distributed alternately are formed; the moso bamboo forest is subjected to strip-shaped thinning treatment, strip-shaped areas are divided according to a high-density-low-density classification mode, and moso bamboos of different growth ages are subjected to thinning according to a certain proportion; performing soil preparation treatment on the moso bamboo forest after thinning; planting nitrogen-fixing plants in the soil under the moso bamboo forest; and treating the soil under the moso bamboo forest by using a soil conditioner. According to the method for restoring the degraded moso bamboo forest soil, arbor layer-under-forest-soil integrated restoration is achieved, systematic improvement is conducted on multiple links of thinning, nitrogen fixation and fertilization, the content of N in the soil and the content of organic matter in the soil are increased, and the diameter at breast height of new bamboo is increased.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of forestry, and particularly relates to a method for repairing degraded Phyllostachys edulis forest soil. BACKGROUND

[0002] China is the world's largest bamboo producer. According to the results of the ninth national forest inventory, the total area of bamboo forest in China is 641.16 million mu, of which the area of Phyllostachys edulis forest accounts for 72.96%. However, due to extensive management, excessive consumption of soil nutrients, and other unreasonable human disturbances and natural factors, the area of low-quality and low-efficiency Phyllostachys edulis forest in the low mountain and hilly regions of southern China accounts for at least more than 50%. Long-term monoculture of bamboo forests leads to damage to the structure and function of the ecological system, reduction in stability and stress resistance, deterioration of soil and microenvironment, sharp decline in biodiversity, and decline in system productivity, ultimately leading to bamboo forest degradation. Although the process of bamboo forest soil degradation is slow, its stability is high, and the degradation will directly lead to the overall degradation of the ecological system, including vegetation degradation. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings and deficiencies in the prior art, and to provide a method for repairing degraded Phyllostachys edulis forest soil, which realizes the integrated repair of the arbor layer, the understory, and the soil, and makes systematic improvements in thinning, nitrogen fixation, and fertilization, which is beneficial to increasing the N content and soil organic matter content in the soil and increasing the diameter of new bamboo.

[0004] The present application is achieved by the following technical solutions:

[0005] A method for repairing degraded Phyllostachys edulis forest soil, comprising the following steps: selecting a degraded Phyllostachys edulis forest; dividing the Phyllostachys edulis forest into a strip-shaped zone according to a high-density-low-density classification mode to form alternately distributed high-density zones and low-density zones; performing strip-shaped thinning treatment on the Phyllostachys edulis forest according to the high-density-low-density classification mode to divide the strip-shaped zone, and thinning the Phyllostachys edulis of different growth ages according to a certain proportion; performing soil preparation treatment on the thinned Phyllostachys edulis forest; planting nitrogen-fixing plants in the soil under the Phyllostachys edulis forest; and treating the soil under the Phyllostachys edulis forest with a soil conditioner.

[0006] The application provides a method for repairing degenerated Phyllostachys edulis forest soil, which is characterized by the following steps: dividing the Phyllostachys edulis forest into high-density areas and low-density areas, so that the Phyllostachys edulis forest forms different density zones, which is conducive to the growth of nitrogen-fixing plants in the low-density areas, and further improves the soil fertility of the Phyllostachys edulis forest; reasonably dividing the high-density areas and the low-density areas, removing old bamboos by thinning, reducing the stand density of the Phyllostachys edulis forest, reducing nutrient loss, and further providing more nutrients to new bamboos in the Phyllostachys edulis forest. The method for repairing degenerated Phyllostachys edulis forest soil realizes the integrated repair of the arbor layer, the understory and the soil, and makes systematic improvements in thinning, nitrogen fixation and fertilization, which is conducive to increasing the N content and the soil organic matter content in the soil and increasing the diameter at breast height of new bamboos.

[0007] Further, the Phyllostachys edulis forest is subjected to strip thinning treatment, the strip areas are divided according to the classification mode of high density-low density, and in the step of thinning the Phyllostachys edulis bamboos of different growth ages at a certain ratio, the high-density area is 3000-4000 plants per hectare, and the low-density area is 2000-3000 plants per hectare. By dividing the high-density area and the low-density area and adjusting the stand density by thinning, the remaining trees can obtain more light, water, nutrients and other resources, so as to promote their growth, increase the diameter at breast height of the Phyllostachys edulis bamboos, and improve the yield and quality.

[0008] Further, the Phyllostachys edulis forest is subjected to strip thinning treatment, the strip areas are divided according to the classification mode of high density-low density, and in the step of thinning the Phyllostachys edulis bamboos of different growth ages at a certain ratio, in the high-density area, old bamboos of more than 4 years are felled, the proportion of 1-year-old young bamboos is controlled to be 30%-40%, the proportion of 2-year-old Phyllostachys edulis bamboos is controlled to be 30%-40%, the proportion of 3-year-old Phyllostachys edulis bamboos is controlled to be 15%-25%, and the proportion of 4-year-old Phyllostachys edulis bamboos is not more than 15%; in the low-density area, old bamboos of more than 3 years are felled, the proportion of 1-year-old young bamboos is controlled to be 40%-50%, the proportion of 2-year-old Phyllostachys edulis bamboos is controlled to be 40%-50%, and the proportion of 3-year-old Phyllostachys edulis bamboos is not more than 20%. By reasonably dividing the high-density area and the low-density area, removing old bamboos by thinning, reducing the stand density of the Phyllostachys edulis forest, and reducing nutrient loss, more nutrients can be provided to new bamboos in the Phyllostachys edulis forest.

[0009] Further, the Phyllostachys edulis forest is subjected to strip thinning treatment, the strip areas are divided according to the classification mode of high density-low density, and in the step of thinning the Phyllostachys edulis bamboos of different growth ages at a certain ratio, the Phyllostachys edulis forest is divided into 10*10m quadrats; in the high-density area, if the number of bamboos in the quadrat is less than 40, all the existing Phyllostachys edulis bamboos are retained; if the number exceeds this amount, 4-year-old and 3-year-old Phyllostachys edulis bamboos are felled in turn until the number of Phyllostachys edulis bamboos in the sample plot is less than 40; in the low-density area, all old bamboos of more than 4 years are felled, if the number of bamboos in the quadrat is less than 30, all the existing Phyllostachys edulis bamboos are retained; if the number exceeds this amount, 3-year-old Phyllostachys edulis bamboos are felled in turn until the number of Phyllostachys edulis bamboos in the sample plot is less than 30.

[0010] Further, in the step of carrying out the ground treatment on the thinned Phyllostachys edulis, 20-30% of the undergrowth is reserved in the high-density area, the rest of the weeds and shrubs are cut off, and the residues of the weeds and shrubs are reserved in the original place; all the undergrowth is cut off in the low-density area, or 10% of the shrubs are reserved.

[0011] Further, in the step of planting the nitrogen-fixing plants in the soil under the Phyllostachys edulis forest, at least one of Trifolium repens, Vicia cracca and Lathyrus sativus is planted.

[0012] Further, in the step of planting the nitrogen-fixing plants in the soil under the Phyllostachys edulis forest, the planting time is from late September to mid-October, and the low-density area is selected for sowing, and the sowing amount is 5-10 kg of seeds per mu.

[0013] Further, in the step of treating the soil under the Phyllostachys edulis forest with the soil conditioner, the spring soil conditioner is applied in April, and 10-20 kg of the spring soil conditioner is applied in the ditch per mu; the autumn soil conditioner is applied in late October, and 15-25 kg of the autumn soil conditioner is applied in the ditch per mu.

[0014] Further, in the step of treating the soil under the Phyllostachys edulis forest with the soil conditioner, the spring soil conditioner comprises microbial fertilizer, carbon-based fertilizer and compound fertilizer, and the ratio of the microbial fertilizer, the carbon-based fertilizer and the compound fertilizer is 3:2:1; the autumn soil conditioner comprises microbial fertilizer, carbon-based fertilizer and compound fertilizer, and the ratio of the microbial fertilizer, the carbon-based fertilizer and the compound fertilizer is 1:1:2.

[0015] Further, in the step of selecting the degraded Phyllostachys edulis forest, the Phyllostachys edulis forest with a proportion of dead bamboo plants greater than 20%, or the Phyllostachys edulis forest with a proportion of bamboo plants with an age of more than 8 years greater than 50%, or the Phyllostachys edulis forest with a proportion of bamboo plants with a diameter at breast height less than 8 cm greater than 50% is selected.

[0016] In order to better understand and implement, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a flowchart of repairing the soil of the degraded Phyllostachys edulis forest.

[0018] Figure 2 is a comparison chart of the change of the soil organic matter content of the Phyllostachys edulis forest in Example 2.

[0019] Figure 3 is a comparison chart of the change of the total nitrogen content of the bamboo forest soil in Example 2.

[0020] Figure 4 is a comparison chart of the change of the average diameter at breast height of the new bamboo in the Phyllostachys edulis forest in Example 2.

[0021] Figure 5 is a comparison chart of the change of the soil organic matter content of the Phyllostachys edulis forest in Example 3.

[0022] Figure 6 is a contrastive graph of total nitrogen content change of bamboo forest soil of Example 3.

[0023] Figure 7 is a contrastive graph of average DBH change of new bamboo of bamboo forest of Example 3. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be further described below in conjunction with the drawings and examples. It can be understood that the specific embodiments described herein are only used to explain the embodiments of the present application, but not limit the embodiments of the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the embodiments of the present application are shown in the drawings, but not all the structures.

[0025] In addition, the terms first, second, third and the like in the description and claims are only used for the purpose of distinguishing between similar technical features, and should not be understood as indicating or implying relative importance or a number of the indicated technical features. They are not necessarily used in the order or time sequence. In appropriate cases, the terms can be interchangeable. Thus, features with "first" and "second" can explicitly or implicitly include at least one of the features.

[0026] Similarly, the terms "fixed" and "connected" are also used in the description and claims, which should not be understood as being limited to direct connection. Therefore, the expression "device A is connected to device B" should not be limited to that device A is directly connected to device B in the device or system, which means that there is a path between device A and device B, which can be a path including other devices or tools.

[0027] Example 1

[0028] The present embodiment provides a method for repairing degraded Phyllostachys edulis forest soil, Figure 1 is a flow chart of repairing degraded Phyllostachys edulis forest soil, please refer to Figure 1 The method for repairing degraded Phyllostachys edulis forest soil comprises the following steps:

[0029] Step S1: Selecting a degraded Phyllostachys edulis forest.

[0030] In the present embodiment, the Phyllostachys edulis forest with the proportion of dead bamboo plants greater than 20%, or the Phyllostachys edulis forest with the proportion of bamboo plants with an age of more than 8 years greater than 50%, or the Phyllostachys edulis forest with the proportion of bamboo plants with a DBH less than 8 cm greater than 50% is selected.

[0031] Step S2: Zoning the Phyllostachys edulis forest, dividing it into multiple strip-shaped areas according to the classification mode of high density-low density, forming high density areas and low density areas alternately distributed.

[0032] In the embodiment, the bamboo forest is divided into multiple strip regions with a width of about 10-20 m, and the high-density regions and the low-density regions are alternately distributed.

[0033] Step S3: strip thinning treatment is performed on the Phyllostachys edulis forest, the strip regions are divided according to the classification mode of high-density-low-density, and the Phyllostachys edulis of different growth ages are thinned at a certain ratio.

[0034] In the embodiment, the high-density region has 3000-4000 plants per hectare, and the low-density region has 2000-3000 plants per hectare. In the high-density region, old bamboos of 4 years or more are harvested, and the proportion of 1-year-old young bamboos is controlled to be 30%-40%, the proportion of 2-year-old bamboos is controlled to be 30%-40%, the proportion of 3-year-old bamboos is controlled to be 15%-25%, and the proportion of 4-year-old bamboos is controlled to be no more than 15%. In the low-density region, old bamboos of 3 years or more are harvested, and the proportion of 1-year-old young bamboos is controlled to be 40%-50%, the proportion of 2-year-old bamboos is controlled to be 40%-50%, and the proportion of 3-year-old bamboos is controlled to be no more than 20%. By reasonably dividing the high-density region and the low-density region, old bamboos are thinned, the stand density of the Phyllostachys edulis forest is reduced, nutrient loss is reduced, and nutrients in the Phyllostachys edulis forest can be more provided to new bamboos.

[0035] Specifically, the Phyllostachys edulis forest is divided into 10x10m quadrats; in the high-density region, if the number of bamboos in the quadrat is less than 40, all the existing Phyllostachys edulis is retained; if the number exceeds this amount, 4-year-old and 3-year-old bamboos are successively harvested until the number of bamboos in the sample plot is less than 40; in the low-density region, all old bamboos of 4 years or more are harvested, if the number of bamboos in the quadrat is less than 30, all the existing Phyllostachys edulis is retained; if the number exceeds this amount, 3-year-old bamboos are successively harvested until the number of bamboos in the sample plot is less than 30.

[0036] Step S4: ground treatment is performed on the Phyllostachys edulis forest after thinning.

[0037] In the embodiment, there is no need to turn over the soil, 20%-30% of the understory vegetation is retained in the high-density region, the rest of the weeds and shrubs are cut off, and the residues of the weeds and shrubs are retained in the original place; for the seriously degraded Phyllostachys edulis forest, the understory shrubs can be retained. All the understory vegetation is cut off in the low-density region, or 10% of the shrubs are retained.

[0038] Step S5: nitrogen-fixing plants are planted in the soil under the Phyllostachys edulis forest.

[0039] In the embodiment, at least one of white clover, purple vetch, and arrow pea is planted.

[0040] The nitrogen-fixing plants are mainly sown in autumn, the sowing time is selected to be from the end of September to the middle of October, the sowing is performed in the low-density region, and the sowing amount is 5-10 kg of seeds per mu. For the bamboo forest with a larger density, the sowing amount can be appropriately reduced.

[0041] Step S6: treating the soil under the Phyllostachys edulis forest with a soil conditioner.

[0042] In April, a spring soil conditioner is applied, 10-20 kg of the spring soil conditioner is applied to each mu of ditch, the spring soil conditioner includes microbial fertilizer, carbon-based fertilizer and compound fertilizer, and the ratio of the microbial fertilizer, the carbon-based fertilizer and the compound fertilizer is 3:2:1.

[0043] In late October, an autumn soil conditioner is applied, 15-25 kg of the autumn soil conditioner is applied to each mu of ditch; the autumn soil conditioner includes microbial fertilizer, carbon-based fertilizer and compound fertilizer, and the ratio of the microbial fertilizer, the carbon-based fertilizer and the compound fertilizer is 1:1:2.

[0044] In this embodiment, the effective viable bacterial count of the microbial fertilizer is ≥500 million / g; the carbon-based fertilizer includes rice husk carbon; the main components of the compound fertilizer include urea, ammonium phosphate and potassium chloride, and the mass ratio of N:S:K is 15:15:15.

[0045] Example 2

[0046] The embodiment provides a method for repairing degraded Phyllostachys edulis forest soil, which comprises the following steps:

[0047] Step S1: selecting a degraded Phyllostachys edulis forest.

[0048] In this embodiment, the degraded Phyllostachys edulis forest is selected, the proportion of bamboo with an age of more than 8 years is close to 60%, the vegetation density under the forest is medium, and the bamboo forest density is about 5800 plants per hectare.

[0049] Step S2: zonally partitioning the Phyllostachys edulis forest, and dividing the forest into a plurality of strip-shaped regions according to a high-density-low-density classification mode to form high-density regions and low-density regions which are alternately distributed.

[0050] In this embodiment, the bamboo forest is divided into 40 strip-shaped regions with a width of about 15 m, and the high-density regions and the low-density regions are alternately distributed.

[0051] Step S3: performing strip-shaped thinning treatment on the Phyllostachys edulis forest, and dividing the strip-shaped regions according to the high-density-low-density classification mode, and thinning the Phyllostachys edulis of different growth ages according to a certain proportion.

[0052] In this embodiment, the high-density region is 3550 plants per hectare, and the low-density region is 2300 plants per hectare.

[0053] In the high-density region, old bamboos with an age of more than 4 years are harvested, and the proportion of 1-year-old young bamboos is controlled to be 36%, the proportion of 2-year-old bamboos is controlled to be 33%, the proportion of 3-year-old bamboos is controlled to be 19%, and the proportion of 4-year-old bamboos is controlled to be 12%.

[0054] In the low-density area, harvest old bamboo over 3 years old, control 1-year-old young bamboo to account for 43%, 2-year-old bamboo to account for 46%, and 3-year-old bamboo to account for 11%.

[0055] Step S4: Perform land preparation treatment on the thinned bamboo forest.

[0056] In this embodiment, the high-density area retains 20% of shrubs; the low-density area cuts off all undergrowth and shrubs, and retains the residues in the original place.

[0057] Step S5: Plant nitrogen-fixing plants in the soil under the bamboo forest.

[0058] In this embodiment, white clover is sown in the low-density area in early October, with a sowing amount of 9 kg of seeds per mu.

[0059] Step S6: Use soil conditioner to treat the soil under the bamboo forest.

[0060] In this embodiment, 12 kg of spring soil conditioner is applied per mu in mid-April, and 15 kg of autumn soil conditioner is applied per mu in late October.

[0061] In this embodiment, the bamboo forest is managed subsequently, and 5-year-old old bamboo is removed in the high-density area, and old bamboo over 4 years old is removed in the low-density area, and part of white clover is replanted, with a seed usage of about 2 kg per mu.

[0062] Figure 2 is a comparison chart of the change of soil organic matter content of the bamboo forest in this embodiment, Figure 3 is a comparison chart of the change of total nitrogen content of the bamboo forest soil, Figure 4 is a comparison chart of the change of average diameter at breast height of new bamboo in the bamboo forest, please refer to Figures 2-4 Through the method for repairing degraded bamboo forest soil in this embodiment, the N content in the bamboo forest soil is increased by 16.25% in the second year, the soil organic matter content is increased by 21.04%, and the diameter at breast height of new bamboo is increased by 10.70%; in the third year, the soil organic matter is increased by 15.58%, the N content is increased by 15.39%, and the diameter at breast height of new bamboo is increased by 7.73%.

[0063] Example 3

[0064] This embodiment provides a method for repairing degraded bamboo forest soil, comprising the following steps:

[0065] Step S1: Select a degraded bamboo forest.

[0066] In this embodiment, a degraded bamboo forest is selected, and in the degraded bamboo forest with generally small diameter at breast height, the proportion of bamboo with a diameter at breast height less than 8 cm is close to about 63%, the undergrowth vegetation is very little, and the bamboo forest density is as high as 7700 plants per hectare.

[0067] Step S2: The bamboo forest is divided into a plurality of strip regions according to the classification mode of high density-low density, and the high density region and the low density region are alternately distributed.

[0068] In this embodiment, the bamboo forest is divided into 50 strip regions with a width of about 15 m.

[0069] Step S3: The strip region of the bamboo forest is divided according to the classification mode of high density-low density, and the bamboo of different growth ages is thinned according to a certain proportion.

[0070] In this embodiment, the high density region is 3800 plants per hectare, and the low density region is 2500 plants per hectare.

[0071] In the high density region, old bamboos over 5 years and part of new bamboos with a diameter less than 4 cm are harvested, and the proportion of 1-year-old young bamboos is controlled to be 32%, the proportion of 2-year-old bamboos is controlled to be 35%, the proportion of 3-year-old bamboos is controlled to be 22%, and the proportion of 4-year-old bamboos is controlled to be 11%.

[0072] In the low density region, old bamboos over 3 years and part of new bamboos with a diameter less than 5 cm are harvested, and the proportion of 1-year-old young bamboos is controlled to be 48%, the proportion of 2-year-old bamboos is controlled to be 40%, and the proportion of 3-year-old bamboos is 12%.

[0073] Step S4: The soil of the thinned bamboo forest is treated.

[0074] In this embodiment, the high density region retains less than 20% of the shrubs, cuts a small amount of undergrowth weeds and shrubs growing more luxuriantly in the region, and retains the residues in the original place.

[0075] The low density region cuts all the undergrowth weeds and shrubs, and retains the residues in the original place.

[0076] Step S5: Nitrogen-fixing plants are planted in the soil under the bamboo forest.

[0077] In this embodiment, white clover is sown in the low density region in early October, and the sowing amount is 7 kg of seeds per mu.

[0078] Step S6: The soil under the bamboo forest is treated with soil conditioner.

[0079] In this embodiment, 15 kg of spring soil conditioner is applied per mu in mid-April, and 20 kg of autumn soil conditioner is applied per mu in late October.

[0080] Figure 5 is a comparison chart of the change of the organic matter content of the soil of the bamboo forest in this embodiment, Figure 6 is a comparison chart of the change of the total nitrogen content of the soil of the bamboo forest, Figure 7is a contrastive chart of the average diameter at breast height of new bamboo in the bamboo forest, please refer to Figures 5-7 Through the method for repairing the degraded bamboo forest soil, the organic matter content of the bamboo forest soil is increased by 17.19% in the second year, the N content in the soil is increased by 35.20%, and the diameter at breast height of the new bamboo is increased by 19.79%; the soil organic matter is increased by 23.17% in the third year, the N content is increased by 17.49%, and the diameter at breast height of the new bamboo is increased by 14.93% in the third year.

[0081] Example 4

[0082] The embodiment provides a method for repairing degraded bamboo forest soil, comprising the following steps:

[0083] Step S1: selecting a degraded bamboo forest.

[0084] In the embodiment, the proportion of bamboo with an age of more than 8 years is close to 60%, the understory vegetation density is medium, and the bamboo density is about 6000 plants per hectare.

[0085] Step S2: zonally partitioning the bamboo forest, and dividing the bamboo forest into a plurality of strip-shaped regions according to a high-density-low-density classification mode to form high-density regions and low-density regions which are alternately distributed.

[0086] In the embodiment, the bamboo forest is divided into 40 strip-shaped regions with a width of about 15 m, and the high-density regions and the low-density regions are alternately distributed.

[0087] Step S3: performing strip-shaped thinning treatment on the bamboo forest, and dividing the strip-shaped regions according to the high-density-low-density classification mode to thin the bamboo of different growth ages according to a certain proportion.

[0088] In the embodiment, the high-density region is 3000 plants per hectare, and the low-density region is 2000 plants per hectare.

[0089] In the high-density region, old bamboos with an age of more than 4 years are felled, and the proportion of 1-year-old young bamboos, 2-year-old bamboos, 3-year-old bamboos and 4-year-old bamboos is controlled to be 30%, 40%, 20% and 10% respectively.

[0090] In the low-density region, old bamboos with an age of more than 3 years are felled, and the proportion of 1-year-old young bamboos, 2-year-old bamboos and 3-year-old bamboos is controlled to be 40%, 45% and 15% respectively.

[0091] Step S4: performing soil preparation treatment on the thinned bamboo forest.

[0092] In the embodiment, 30% of shrubs are reserved in the high-density region; all understory weeds and shrubs are cut off in the low-density region, and the residues are reserved in the original place.

[0093] Step S5: planting nitrogen-fixing plants in the soil under the bamboo forest.

[0094] In this embodiment, in early October, the nitrogen-fixing plant white clover is sown in the low-density area at a seeding amount of 5 kg of seeds per mu.

[0095] Step S6: The soil under the Phyllostachys edulis forest is treated with a soil conditioner.

[0096] In this embodiment, in mid-April, 10 kg of spring soil conditioner is applied in furrows per mu, and in late October, 15 kg of autumn soil conditioner is applied in furrows per mu.

[0097] Example 5

[0098] The present embodiment provides a method for repairing degraded Phyllostachys edulis forest soil, comprising the following steps:

[0099] Step S1: Select a degraded Phyllostachys edulis forest.

[0100] In this embodiment, a degraded Phyllostachys edulis forest is selected, with a proportion of more than 8 years old bamboo of nearly 60%, a medium density of understory vegetation, and a bamboo density of about 5500 plants per hectare.

[0101] Step S2: The Phyllostachys edulis forest is zoned in strips, divided into multiple strip-shaped areas according to the classification mode of high density-low density, and high-density areas and low-density areas are alternately distributed.

[0102] In this embodiment, the bamboo forest is divided into 40 strip-shaped areas with a width of about 15 m, and high-density areas and low-density areas are alternately distributed.

[0103] Step S3: The Phyllostachys edulis forest is subjected to strip thinning treatment, and the strip-shaped areas are divided according to the classification mode of high density-low density, and the Phyllostachys edulis of different growth ages are thinned at a certain proportion.

[0104] In this embodiment, the high-density area is 4000 plants per hectare, and the low-density area is 3000 plants per hectare.

[0105] In the high-density area, old bamboo of more than 4 years old is harvested, and the proportion of 1-year-old young bamboo is controlled to be 40%, the proportion of 2-year-old bamboo is controlled to be 40%, the proportion of 3-year-old bamboo is controlled to be 15%, and the proportion of 4-year-old bamboo is controlled to be 5%.

[0106] In the low-density area, old bamboo of more than 3 years old is harvested, and the proportion of 1-year-old young bamboo is controlled to be 45%, the proportion of 2-year-old bamboo is controlled to be 50%, and the proportion of 3-year-old bamboo is controlled to be 5%.

[0107] Step S4: The Phyllostachys edulis forest after thinning is subjected to land preparation treatment.

[0108] In this embodiment, the high-density area retains a proportion of 30% of shrubs; the low-density area cuts off all understory weeds and shrubs, and retains the residues in the original place.

[0109] Step S5: Planting nitrogen-fixing plants in the soil under the Phyllostachys edulis forest.

[0110] In this embodiment, white clover, a nitrogen-fixing plant, is sown in the low-density area in early October at a seeding amount of 10 kg of seeds per mu.

[0111] Step S6: Using soil amendment to treat the soil under the Phyllostachys edulis forest.

[0112] In this embodiment, 20 kg of spring soil amendment is applied in furrows per mu in mid-April, and 25 kg of autumn soil amendment is applied in furrows per mu in late October.

[0113] Example 6

[0114] The present embodiment provides a method for repairing degraded Phyllostachys edulis forest soil, comprising the following steps:

[0115] Step S1: Selecting a degraded Phyllostachys edulis forest.

[0116] In this embodiment, a degraded Phyllostachys edulis forest is selected, with a proportion of trees over 8 years old close to 60%, a medium density of understory vegetation, and a forest density of about 5800 trees per hectare.

[0117] Step S2: Zoning the Phyllostachys edulis forest in strips, dividing it into multiple strip-shaped areas according to the classification mode of high density-low density, forming alternating high-density and low-density areas.

[0118] In this embodiment, the forest is divided into 40 strip-shaped areas with a width of about 15 m, with high-density and low-density areas alternating.

[0119] Step S3: Thinning the Phyllostachys edulis forest in strips, dividing the strip-shaped areas according to the classification mode of high density-low density, and thinning the Phyllostachys edulis of different ages in a certain proportion.

[0120] In this embodiment, the high-density area has a density of 4000 trees per hectare, and the low-density area has a density of 3000 trees per hectare.

[0121] In the high-density area, old bamboo over 4 years old is harvested, with 1-year-old seedlings accounting for 40%, 2-year-old Phyllostachys edulis accounting for 30%, 3-year-old Phyllostachys edulis accounting for 25%, and 4-year-old Phyllostachys edulis accounting for 5%.

[0122] In the low-density area, old bamboo over 3 years old is harvested, with 1-year-old seedlings accounting for 40%, 2-year-old Phyllostachys edulis accounting for 40%, and 3-year-old Phyllostachys edulis accounting for 20%.

[0123] Step S4: Conducting site preparation treatment on the thinned Phyllostachys edulis forest.

[0124] In this embodiment, 30% of the shrubs are retained in the high-density area; and all understory weeds and shrubs are removed in the low-density area, and their remains are retained in situ.

[0125] Step S5: Planting nitrogen-fixing plants in the soil under the bamboo forest.

[0126] In this embodiment, the nitrogen-fixing plant white clover was sown in the low-density area in early October at a sowing rate of 5 kg of seeds per mu.

[0127] Step S6: treating the soil under the bamboo forest with a soil conditioner.

[0128] In this embodiment, 10 kg of spring soil conditioner was applied per mu of furrow in mid-April, and 15 kg of autumn soil conditioner was applied per mu of furrow in late October.

[0129] Example 7

[0130] This embodiment provides a method for repairing soil in a degraded bamboo forest, comprising the following steps:

[0131] Step S1: Select a degraded bamboo forest.

[0132] In this embodiment, a degraded bamboo forest was selected, in which the proportion of bamboos aged 8 years or more was close to 60%, the density of understory vegetation was medium, and the bamboo forest density was about 6,000 bamboos per hectare.

[0133] Step S2: Zoning the bamboo forest into strips according to a high-density-low-density classification mode, dividing the bamboo forest into multiple strips to form alternating high-density areas and low-density areas.

[0134] In this embodiment, the bamboo forest is divided into 45 strips with a width of about 15 m, with high-density areas and low-density areas distributed alternately.

[0135] Step S3: performing strip thinning on the bamboo forest, dividing the strip area according to a high-density-low-density classification mode, and thinning bamboos of different growth ages according to a certain ratio.

[0136] In this embodiment, the high-density area has 4,000 plants per hectare, and the low-density area has 3,000 plants per hectare.

[0137] In high-density areas, when harvesting old bamboos that are more than 4 years old, the proportion of 1-year-old young bamboos is controlled at 30%, 2-year-old bamboos at 30%, 3-year-old bamboos at 25%, and 4-year-old bamboos at 15%.

[0138] In low-density areas, when harvesting old bamboos that are more than three years old, the proportion of one-year-old young bamboos is controlled to 50%, the proportion of two-year-old bamboos is controlled to 40%, and the proportion of three-year-old bamboos is controlled to 10%.

[0139] Step S4: After thinning, the bamboo forest is subjected to land preparation treatment.

[0140] In this embodiment, the high-density area retains 30% of shrubs; the low-density area cuts off all undergrowth and shrubs, and retains the residues in situ.

[0141] Step S5: Nitrogen-fixing plants are planted in the soil under the bamboo forest.

[0142] In this embodiment, white clover is sown in the low-density area in early October, with a sowing amount of 5 kg of seeds per mu.

[0143] Step S6: Soil amendment is used to treat the soil under the bamboo forest.

[0144] In this embodiment, 10 kg of spring soil amendment is trench-applied per mu in mid-April, and 15 kg of autumn soil amendment is trench-applied per mu in late October.

[0145] The present application is not limited to the above-described embodiments, and various modifications or alterations can be made to the present application without departing from the spirit and scope of the present application, and the present application is intended to include such modifications and alterations within the scope of the claims and equivalent technology of the present application.

Claims

1. A method for repairing soil in a degraded bamboo forest, characterized in that: The following steps are involved: Select degraded bamboo forests; The bamboo forest was divided into multiple strips according to the high-density-low-density classification pattern, forming alternating high-density and low-density areas; Thinning bamboo forests in strips is carried out, and the strips are divided into high-density-low-density classification patterns. Bamboos of different growth ages are thinned in a certain proportion. Carry out land preparation for the bamboo forest after thinning; Plant nitrogen-fixing plants in the soil beneath the bamboo forest; Use soil conditioners to treat the soil under the bamboo forest.

2. The method for repairing soil in a degraded bamboo forest according to claim 1, wherein: The bamboo forest is subjected to strip thinning. The strip areas are divided according to the high-density-low-density classification model. The bamboos of different growth ages are thinned according to a certain proportion. The high-density area is 3,000 to 4,000 plants per hectare, and the low-density area is 2,000 to 3,000 plants per hectare.

3. The method for repairing soil in a degraded bamboo forest according to claim 2, wherein: The bamboo forest is subjected to strip thinning treatment. The strip areas are divided according to the high-density-low-density classification model. In the thinning step, bamboos of different growth ages are cut according to a certain proportion. In the high-density area, old bamboos over 4 years old are cut, and the proportion of 1-year-old young bamboos is controlled to 30%-40%, 2-year-old bamboos to 30%-40%, 3-year-old bamboos to 15%-25%, and 4-year-old bamboos to no more than 15%. In low-density areas, when felling old bamboos that are more than three years old, the proportion of one-year-old young bamboos should be controlled at 40%-50%, the proportion of two-year-old bamboos should be controlled at 40%-50%, and the proportion of three-year-old bamboos should not exceed 20%.

4. The method for repairing soil in a degraded bamboo forest according to claim 3, wherein: The bamboo forest was subjected to strip thinning. The strip areas were divided according to the high-density-low-density classification model. The bamboos of different growth ages were thinned according to a certain ratio. The bamboo forest was divided into 10×10m sample plots. In high-density areas, if there are fewer than 40 bamboos in a plot, all existing bamboos will be retained; if there are more than this number, 4-year-old and 3-year-old bamboos will be harvested in sequence until the number of bamboos in the plot is less than 40; In the low-density area, all old bamboos older than 4 years were cut down. If there were fewer than 30 bamboos in the plot, all existing bamboos were retained. If there were more than this number, bamboos that were 3 years old were cut down in sequence until the number of bamboos in the plot was less than 30.

5. The method for repairing soil in a degraded bamboo forest according to claim 1, wherein: In the step of preparing the land for the thinned bamboo, 20% to 30% of the understory vegetation is retained in the high-density area, the remaining weeds and shrubs are cut, and the remnants of the weeds and shrubs are retained in place; In low-density areas, remove all understory vegetation, or retain 10% of the shrubs.

6. The method for repairing soil in a degraded bamboo forest according to claim 1, wherein: In the step of planting nitrogen-fixing plants in the soil under the bamboo forest, at least one of white clover, purple vetch and arrow pea is planted.

7. The method for repairing soil in a degraded bamboo forest according to claim 6, characterized in that: In the step of planting nitrogen-fixing plants in the soil under the bamboo forest, the planting time is from late September to mid-October, and a low-density area is selected for sowing, with a sowing amount of 5-10 kg of seeds per mu.

8. The method for repairing soil in a degraded bamboo forest according to claim 1, wherein: In the step of treating the soil under the bamboo forest with soil conditioners, spring soil conditioners are applied in April, with 10-20 kg of spring soil conditioners applied per mu of ditch; autumn soil conditioners are applied in late October, with 15-25 kg of autumn soil conditioners applied per mu of ditch.

9. The method for repairing soil in a degraded bamboo forest according to claim 8, characterized in that: In the step of treating the soil under the bamboo forest with a soil conditioner, the spring soil conditioner includes microbial fertilizer, charcoal-based fertilizer and compound fertilizer, and the ratio of microbial fertilizer, charcoal-based fertilizer and compound fertilizer is 3:2:1; The autumn soil conditioner includes microbial fertilizer, charcoal-based fertilizer and compound fertilizer, and the ratio of microbial fertilizer, charcoal-based fertilizer and compound fertilizer is 1:1:

2.

10. The method for repairing soil in a degraded bamboo forest according to claim 1, characterized in that: In the step of selecting degraded bamboo forests, a bamboo forest with a dead bamboo population of more than 20%, a bamboo forest with bamboos aged more than 8 years of age of more than 50%, or a bamboo forest with bamboos with a breast diameter of less than 8 cm of age of more than 50% is selected.

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