Forest management method for improving quality and efficiency of man-made Chinese fir forest, application and man-made Chinese fir forest

Abstract

The invention discloses a forest management method for improving quality and efficiency of a fir man-made forest, application and the fir man-made forest, and the forest management method for improving quality and efficiency of the fir man-made forest comprises the following steps: cutting off part of forests in the fir man-made forest to enable the retention density of the existing forest stand to be 100-1050 plants / hm < 2 >; precious and indigenous tree species are planted in forest stand gaps in a complementary mode, and the complementary plant number is 300 plants / hm < 2 > to 1260 plants / hm < 2 >; the complementary planting tree species are at least three of phoebe bournei, sweetgum, schima superba, camphor tree, cyclobalanopsis glauca, taxus chinensis var mairei, gingko, schima superba, mangnolia officinalis, melia azedarach and sapium discolor. According to the method, quality improvement / operation transformation measures such as stand density adjustment and tree species configuration regulation are carried out on the fir man-made forests in different age groups, precious and indigenous tree species are selected according to local conditions for complementary planting, different-age, multi-layer and mixed stand is cultivated, precious wood is stored, and the operation purpose of quality improvement and efficiency improvement of the fir man-made forests is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of forest management, and in particular relates to a forest management method for improving the quality and efficiency of a Chinese fir plantation, its application, and the Chinese fir plantation. Background Art

[0002] Chinese fir is a tall tree in the Cupressaceae family. Its yellowish-white wood is used as a building material for construction, bridges, and shipbuilding. Its strong wind and dust resistance make it suitable for use as a street tree and windbreak. As an important fast-growing timber species in southern my country, Chinese fir boasts strong adaptability, rapid growth, and excellent timber quality, making it a dominant species in plantation cultivation throughout Hunan Province.

[0003] Traditional Chinese fir plantations adopt a pure forest management model. Although it can achieve higher economic benefits in the short term, the long-term continuous planting of a single tree species has caused problems such as soil fertility decline, biodiversity decline, and frequent pests and diseases, which seriously restrict the sustainable management of Chinese fir plantations.

[0004] Therefore, how to implement forest management methods to improve the quality and efficiency of Chinese fir plantations is a key issue in enhancing the stability of forest ecosystems, reserving precious timber, and achieving high-quality development of forestry in the province. Summary of the Invention

[0005] The purpose of the present invention is to provide a forest management method for improving the quality and efficiency of Chinese fir plantations, an application thereof, and a Chinese fir plantation. The forest management method can achieve the effects of improving the quality and efficiency of Chinese fir plantations and sustainable management.

[0006] In order to achieve the above object, the specific technical solutions provided by the present invention are as follows: A forest management method for improving the quality and efficiency of Chinese fir plantations, comprising the following steps: Fell some trees in the fir forest to keep the density of the existing forest at 100 trees / hm2. 2 -1050 plants / hm 2 ; Replant precious and native tree species in the gaps between stands, with a planting number of 300 trees / hm2 2 -1260 plants / hm 2 ; The replanted tree species are at least three of Phoebe bournei, Liquidambar formosana, Schima superba, Cinnamomum camphora, Cyclobalanopsis glauca, Taxus chinensis var. mairei, Ginkgo biloba, Schima superba, Magnolia officinalis, Chinaberry and Sapium sebiferum.

[0007] In one or more embodiments of the present invention, the age group of the Chinese fir plantation is at least one of a middle-aged forest, a near-mature forest and a mature forest.

[0008] In one or more embodiments of the present application, according to the stand density of the transformed forest of the Chinese fir plantation, the number of the rare and native species of the supplementary planting trees satisfies any one of the following: the stand density of the transformed forest of the Chinese fir plantation is 100 trees / hm 2 -250 trees / hm 2 , and the number of the rare and native species of the supplementary planting trees is 675 trees / hm 2 -890 trees / hm 2 ; the stand density of the transformed forest of the Chinese fir plantation is 500 trees / hm 2 -650 trees / hm 2 , and the number of the rare and native species of the supplementary planting trees is 540 trees / hm 2 -1260 trees / hm 2 ; the stand density of the transformed forest of the Chinese fir plantation is 750 trees / hm 2 -1050 trees / hm 2 , and the number of the rare and native species of the supplementary planting trees is 300 trees / hm 2 -870 trees / hm 2 .

[0009] In one or more embodiments of the present application, when part of the trees in the Chinese fir plantation are cut down, according to different age groups, the stand density of the transformed forest of the Chinese fir plantation satisfies any one of the following: the Chinese fir plantation is a middle-aged forest, and the stand density of the transformed forest is 800 trees / hm 2 -1020 trees / hm 2 ; the Chinese fir plantation is a near-mature forest, and the stand density of the transformed forest is 500 trees / hm 2 -600 trees / hm 2 ; the Chinese fir plantation is a mature forest, and the stand density of the transformed forest is 700 trees / hm 2 -800 trees / hm 2 .

[0010] In one or more embodiments of the present application, according to different age groups, the number of the rare and native species of the supplementary planting trees satisfies any one of the following: the forest is a middle-aged forest, and the number of the rare and native species of the supplementary planting trees is 300 trees / hm 2 -600 trees / hm 2 ; the forest is a near-mature forest, and the number of the rare and native species of the supplementary planting trees is 540 trees / hm 2 -1260 trees / hm 2 ; The forest is classified as mature forest, and the number of replanted precious and native tree species is 675 trees / hm2. 2 -870 plants / hm 2 .

[0011] In one or more embodiments of the present invention, the age group of the Chinese fir plantation is any one of middle-aged forest, near-mature forest and mature forest, and the precious and native tree species to be replanted are at least three of Phoebe chinensis, Liquidambar formosana, Cyclobalanopsis glauca, Cinnamomum camphora, Taxus chinensis var. mairei, Ginkgo biloba, Schima superba, Magnolia officinalis, Chinaberry and Sapium sebiferum.

[0012] In one or more embodiments of the present invention, the fir plantation age group is a middle-aged forest, and the ratio of the number of fir trees to precious and native tree species is (1.5-3):1.

[0013] In one or more embodiments of the present invention, the fir plantation age group is a near-mature forest, and the ratio of the number of fir trees to precious and native tree species is 1:(1.0-2).

[0014] In one or more embodiments of the present invention, the fir plantation age group is a mature forest, and the ratio of the number of fir trees to precious and native tree species is 1:(1.5-6).

[0015] Another specific embodiment of the present invention provides a technical solution as follows: A fir plantation obtained by the forest management method for improving the quality and efficiency of the fir plantation.

[0016] Another specific embodiment of the present invention provides a technical solution as follows: A forest management method for improving the quality and efficiency of Chinese fir plantations is used in improving the quality and efficiency of Chinese fir plantations or in transforming low-efficiency forests.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention targets Chinese fir plantations at different age groups, dynamically regulates the tree species configuration structure and stand density, and selects precious and native tree species for replanting according to local conditions, so as to achieve the management goal of improving the quality and efficiency of Chinese fir plantations.

[0018] 2. The present invention enables both species and existing fir trees to better adapt to the environment by replanting precious and native tree species early in the year, thus avoiding the problem of established niche suppression faced by replanting later. When the stand density is high, the replanted species prioritize resources for vertical growth to obtain light. Therefore, measures to improve the quality and efficiency of fir plantations in the young and middle-aged forest stage, while simultaneously replanting common precious and native tree species in the province, such as Phoebe bournei, Schima superba, Cyclobalanopsis glauca, Liquidambar formosana, and Cinnamomum camphora, can achieve better quality and efficiency improvements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the examples of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation cases or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a growth performance diagram of Chinese fir trees and replanted tree species in different age groups of forest stands in Example 1 of the present invention; Figure 2 This is a growth performance diagram of different replanted tree species in Example 1 of the present invention. DETAILED DESCRIPTION

[0021] To help those skilled in the art better understand the technical solutions of the present invention, the following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0022] A specific embodiment of the present invention provides a forest management method for improving the quality and efficiency of a Chinese fir plantation, comprising steps 1-2.

[0023] Step 1: Remove some trees in the existing fir forest to keep the stand density at 100 trees / hm2. 2 -1050 plants / hm 2 .

[0024] Specifically, through thinning, the density of existing forest stands can be controlled within a reasonable range, providing space for the replanting of precious and native tree species.

[0025] Step 2: Replant precious and native tree species in the thinned stands at a rate of 300 trees / hm2. 2 -1260 plants / hm 2 .

[0026] Specifically, at least three of the precious and native tree species selected from Phoebe chinensis, Liquidambar formosana, Schima superba, Cinnamomum camphora, Cyclobalanopsis glauca, Taxus chinensis var. mairei, Ginkgo biloba, Schima superba, Magnolia officinalis, Chinaberry tree, and Sapium sebiferum are replanted. By responding to the invasion and competition of the replanted tree species, the growth of the Chinese fir forest is promoted, and the growth performance of the replanted tree species is excellent.

[0027] Furthermore, the age group of the existing Chinese fir plantations is at least one of middle-aged forests, near-mature forests and mature forests. Precious and native tree species are replanted, and a stable root system and canopy structure can be formed after replanting, so that the growth potential of precious and native tree species can be maximized and the quality of the forest stand can be improved.

[0028] Further, according to the reserved density of the Cunninghamia lanceolata stand after thinning, the number of the rare and native species of the supplementary planting plants satisfies any one of the following: the reserved density of the Cunninghamia lanceolata stand after thinning is 100 plants / hm 2 -250 plants / hm 2 , the number of the rare and native species of the supplementary planting plants is 675 plants / hm 2 -890 plants / hm 2 ; the reserved density of the Cunninghamia lanceolata stand after thinning is 500 plants / hm 2 -650 plants / hm 2 , the number of the rare and native species of the supplementary planting plants is 540 plants / hm 2 -1260 plants / hm 2 ; the reserved density of the Cunninghamia lanceolata stand after thinning is 750 plants / hm 2 -1050 plants / hm 2 , the number of the rare and native species of the supplementary planting plants is 300 plants / hm 2 -870 plants / hm 2 .

[0029] Specifically, by controlling the reserved density and the number of the supplementary planting plants, the Cunninghamia lanceolata and the supplementary planting plants have good growth performance after the supplementary planting.

[0030] Further, when part of the Cunninghamia lanceolata in the Cunninghamia lanceolata forest is cut, the reserved density of the remaining Cunninghamia lanceolata satisfies any one of the following according to different age groups: the Cunninghamia lanceolata plantation is middle-aged forest, and the reserved density of the transformed stand is 800 plants / hm 2 -1020 plants / hm 2 ; the Cunninghamia lanceolata plantation is near-mature forest, and the reserved density of the transformed stand is 500 plants / hm 2 -600 plants / hm 2 ; the Cunninghamia lanceolata plantation is mature forest, and the reserved density of the transformed stand is 700 plants / hm 2 -800 plants / hm 2 .

[0031] Specifically, the corresponding control of the reserved density according to different age groups can better promote the growth of the Cunninghamia lanceolata.

[0032] Further, the number of the rare and native species of the supplementary planting plants satisfies any one of the following according to different age groups: the stand is middle-aged forest, and the number of the rare and native species of the supplementary planting plants is 300 plants / hm 2 -600 plants / hm 2 ; the stand is near-mature forest, and the number of the rare and native species of the supplementary planting plants is 540 plants / hm 2 -1260 plants / hm 2 ; the stand is mature forest, and the number of the rare and native species of the supplementary planting plants is 675 plants / hm 2-870 plants / hm 2 .

[0033] Specifically, there are certain differences in the responses of Chinese fir forests of different age groups to the invasion and competition of precious and native tree species. Controlling the number of replanting of precious and native tree species according to age groups can better optimize the growth of Chinese fir.

[0034] Furthermore, if the fir forest age group is any of the following: mid-aged, near-mature, or mature forests, the replanting of precious and native tree species should be at least three of Phoebe bournei, Liquidambar formosana, Cyclobalanopsis glauca, Cinnamomum camphora, Cyclobalanopsis glauca, Taxus chinensis var. mairei, Ginkgo biloba, Schima superba, Magnolia officinalis, Chinaberry, and Sapium sebiferum. For the fir plantation age group, the ratio of fir to precious and native tree species should be (1.5-3):1; for the fir plantation age group, the ratio of fir to precious and native tree species should be (1:1.0-2); and for the fir plantation age group, the ratio of fir to precious and native tree species should be (1:1.5-6). Combining fir forests of the above age groups with precious and native tree species at a certain ratio can simultaneously promote the growth of both fir and precious and native tree species.

[0035] Furthermore, when replanting precious and native tree species, soil mixed with bamboo fiber, soil mixed with modified zeolite powder, and soil mixed with unmodified zeolite powder are filled in the tree hole from bottom to top in sequence. Among them, the modified zeolite powder is zeolite powder loaded with hyaluronic acid. Fertilizer is applied above the soil mixed with unmodified soil, and water is applied after the tree hole is filled with soil.

[0036] Specifically, the mesh size of the bamboo fiber is 30-60 mesh, the mass ratio of the bamboo fiber to soil is (3-5):20, the mass ratio of the modified zeolite powder to soil is (1-3):10, and the mass ratio of the unmodified zeolite powder to soil is (1-3):10. After fertilization, the fertilizer dissolves in water, and the water containing the fertilizer seeps down to be absorbed by the tree roots. The soil layer containing the unmodified zeolite powder has high porosity, which accelerates water penetration. When water penetrates the soil layer mixed with the modified zeolite powder, the zeolite powder absorbs the water containing the fertilizer due to the strong water absorption of hyaluronic acid, achieving a storage effect. Once the free fertilizer in the soil layer is absorbed, the zeolite powder releases the absorbed fertilizer, making it available for tree absorption and growth. After passing through the soil layer mixed with modified zeolite powder, the water penetrates into the soil layer mixed with bamboo fiber. Bamboo fiber has good moisture absorption and moisture discharge properties, can conduct water, and accelerate the flow of water containing fertilizer in the soil layer, which is more conducive to absorption by tree roots.

[0037] Furthermore, the modified zeolite powder has a particle size of 100-120 mesh, while the unmodified zeolite powder has a particle size of 60-80 mesh. By controlling the mesh size, the soil layer mixed with the unmodified zeolite powder has larger pores, which facilitates the penetration of water containing fertilizer, while the soil layer mixed with the modified zeolite powder has smaller pores, which slows the water penetration and facilitates the adsorption of fertilizer components by the modified zeolite powder.

[0038] Further, the preparation of modified zeolite powder is as follows: Soak the zeolite powder in a hydrochloric acid aqueous solution with a mass concentration of 25%-35%, and heat it at 70℃-80℃ for 1h-2h to activate the zeolite powder so that the zeolite powder contains more hydroxyl groups; then filter, wash, and dry to obtain the activated zeolite powder; The activated zeolite powder and the hyaluronic acid aqueous solution with a concentration of 2mg / ml-3mg / ml are mixed in a mass ratio of 1:(3-4), soaked for 2h-3h, and filtered to obtain the modified zeolite powder.

[0039] Specifically, the molecular weight of hyaluronic acid is 800,000 Daltons to 1.5 million Daltons. Selecting hyaluronic acid with an appropriate molecular weight is conducive to loading hyaluronic acid on the pores and surface of zeolite powder, so that when hyaluronic acid absorbs water, it can load the fertilizer components in the water on the zeolite powder.

[0040] Another specific embodiment of the present invention provides a Chinese fir plantation obtained by the above-mentioned forest management method for improving the quality and efficiency of Chinese fir plantations.

[0041] Another specific embodiment of the present invention provides the application of the above-mentioned forest management method for improving the quality and efficiency of Chinese fir plantations in improving the quality and efficiency of Chinese fir plantations.

[0042] The present invention is further described in detail below with reference to specific embodiments.

[0043] Example 1 Nine experimental plots and two control plots were set up at Jindong Forest Farm in Qiyang City, Yangtang Forest Farm in Ningyuan County, Tian'eshan Forest Farm in Zixing City, Taodong Forest Farm in Guidong County, and Chaoyang Forest Farm in Hunan Province. Plots 1, 2, and a control plot 2 (2-DZYD) were set up at Jindong Forest Farm; Plots 3, 4, and a control plot 4 (4-DZYD) were set up at Yangtang Forest Farm; Plots 5 and 6 were set up at Tian'eshan Forest Farm; Plot 7 was set up at Taodong Forest Farm; and Plots 8 and 9 were set up at Chaoyang Forest Farm. The Chinese fir forest age groups of the present invention were divided into the following categories: young forest: 1-10 years; middle-aged forest: 11-20 years; near-mature forest: 21-25 years; and mature forest: 26-35 years.

[0044] Before March, thinning was carried out on the Chinese fir forests in the experimental and control plots to maintain a certain density, and a certain number of precious and native tree species were replanted in the experimental plots. The original tree species composition, Chinese fir forest age group, initial planting density, replanted tree species, replanted tree age group, total number of replanted trees, and existing stand density after replanting of the experimental and control plots are shown in Table 1.

[0045] Table 1 Experimental plot and control plot settings Table 2 Specific tree species configuration after replanting in the experimental and control plots After the replanting of precious and native tree species, the basic information of the sample plots will be monitored for three consecutive years (October 2022, October 2023, and October 2024), and growth index factors such as diameter at breast height (or ground diameter / d) and tree height (h) will be measured, as shown in Table 3. In Table 3, d is the average diameter at breast height and h is the average tree height.

[0046] Table 3 Tree species growth indicators within three years Table 4 Growth differences of various tree species in different Chinese fir reserve densities Note: * refers to the measurement data of trees with a breast diameter of 5 cm or more.

[0047] Table 5 Growth performance of Chinese fir at different retention densities in stands of different age groups Table 6 Growth performance of various tree species in stands of different age groups Note: * refers to the measurement data of trees with a breast diameter of 5 cm or more.

[0048] Example 2 Select 120-mesh zeolite powder and mix it with a 30% hydrochloric acid solution at a mass ratio of 1:5. Heat the mixture at 70°C for 1 hour, then filter, wash with water, and dry to obtain activated zeolite powder. Dissolve hyaluronic acid (1,000,000 Daltons) in water to prepare a 2 mg / ml treatment solution. Mix the activated zeolite powder and the treatment solution at a mass ratio of 1:4, soak for 2 hours, and filter to obtain modified zeolite powder.

[0049] Plot A was established in Jindong Forest Farm, with the same tree species configuration as Plot 2. Plot B was established in Yangtang Forest Farm, with the same tree species configuration as Plot 4. The corresponding tree species were replanted in March, with the pit depth set at 25 cm. At the same time, soil was filled in at a depth of 22 cm with soil mixed with 50-mesh bamboo fiber at a bamboo fiber to soil ratio of 5:20. At a depth of 20 cm, soil was filled with 120-mesh modified zeolite powder at a modified zeolite to soil ratio of 1:10. At a depth of 17 cm, soil was filled with 80-mesh zeolite powder at a zeolite to soil ratio of 1:10. Fertilize the tree pit at a depth of 15 cm at a rate of 110 g per plant. Use a commercially available fertilizer. In this example, the fertilizer is Stanley fertilizer. The total nitrogen (N), water-soluble phosphorus (P2O5), and soluble potassium (K2O) content in the fertilizer are all 15%, with a total nutrient content of ≥45%. After filling the soil, water the soil appropriately.

[0050] At the same time, deep plowing was carried out on other tree species in the fir forest, with a plowing depth of 20 cm and a plowing area of ​​10 m 2 / plant, fertilize when deep plowing, the fertilization depth is 15cm, and the fertilizer amount is 100g / plant.

[0051] After replanting the trees, deep plowing and fertilization should be carried out once a year in March using the same deep plowing method mentioned above.

[0052] Table 7 Tree species growth indicators in plots A and B over three years Analysis of tree species configuration, combined with Table 3, shows that the stands in the experimental plots exhibited superior growth compared to the control plots. Among them, fir trees grew well in plots 3 and 4, with average annual growth rates of 0.4-0.6 cm and 0.4-0.9 cm for diameter at breast height (DBH), and 0.9-1.4 m and 0.7-1.4 m for height, respectively. The two plots were middle-aged and near-mature forests, respectively, and the replanted species were Phoebe bournei, Liquidambar formosana, Photinia fraseri, Phoebe bournei, and Schima superba. The ratio of the dominant fir species to the replanted species was 1.9:1 and 1:1.9, respectively. Fir trees in the remaining seven plots grew more slowly, with average annual growth rates of 0.2-0.6 cm for DBH and 0.1-0.9 m for height. In addition, the growth of the replanted tree species showed an increasing trend year by year. The tree species replanted in plot No. 7 grew the best, followed by the tree species replanted in plots No. 2 and No. 4, and the tree species replanted in plots No. 1, No. 8 and No. 9 grew poorly.

[0053] Analysis of Chinese fir retention density, as shown in Table 4, shows a significant effect of different stand retention densities on Chinese fir growth. The annual growth rates of both average diameter at breast height and average tree height were positively correlated with retention density. While the annual growth rates of average ground diameter among the replanted tree species did not differ significantly among the three Chinese fir retention density stands, the annual growth rates of average tree height were significantly different, with a positive correlation between the annual growth rates and retention density. Table 5 shows that under different Chinese fir retention densities, Plot 3 exhibited the best growth performance in the mid-aged stand stage, Plot 4 in the near-mature stand stage, and Plot 9 in the mature stand stage.

[0054] From the age group analysis, combined Figure 1 As shown in Table 6, the growth of the dominant Chinese fir species varied significantly across stands of different age groups. The average annual growth rates of diameter at breast height (DBH) in middle-aged, near-mature, and mature stands were 0.47 cm, 0.40 cm, and 0.52 cm, respectively, with the highest values ​​in mature stands followed by middle-aged stands. The average annual growth rates of tree height were 0.57 m, 0.40 m, and 0.45 m, respectively, with the highest values ​​in middle-aged stands followed by mature stands. Near-mature stands had the lowest annual growth rates for both indicators among the three age groups. The growth of replanted species varied significantly across the three age groups, with the average annual growth rates of both ground diameter and height showing a negative correlation with stand age group. In Chinese fir stands of middle-aged, near-mature, and mature stages, the average annual growth rates of ground diameter for replanted species were 0.94 cm, 0.72 cm, and 0.35 cm, respectively, and the average annual growth rates of tree height were 0.89 m, 0.54 m, and 0.27 m, respectively. In the three age groups, the average number of replanted trees was 450 trees / hm2. 2 ,917 plants / hm 2 and 773 strains / hm 2 .

[0055] From the analysis of the growth performance of replanted tree species, combined with Figure 2 As shown in Table 2, the average annual growth in diameter at breast height of replanted Chinese fir plantations is ranked as follows: Cyclobalanopsis > Schima superba > Cinnamomum camphora > Liquidambar formosana > Phoebe bournei > Magnolia officinalis > Taxus chinensis > Ginkgo biloba. The average annual growth in tree height is ranked as follows: Cyclobalanopsis > Schima superba > Liquidambar formosana > Phoebe bournei > Cinnamomum camphora > Magnolia officinalis > Taxus chinensis > Ginkgo biloba. Cyclobalanopsis and Schima superba show good growth, while Phoebe bournei, Liquidambar formosana, and Cinnamomum camphora show stable growth, while Taxus chinensis and Ginkgo biloba show poor growth. Broadleaf trees such as Phoebe bournei and Liquidambar formosana perform worst when replanted with Magnolia officinalis, while Magnolia officinalis shows average growth.

[0056] Therefore, it can be learned from Example 1 that the growth of common and precious native broad-leaved tree species in the province, such as Phoebe chinensis, Liquidambar formosana, Schima superba, Cinnamomum camphora, and Cyclobalanopsis glauca, and the replanted Chinese fir and the replanted tree species all performed well. The stage in which the forest stands and the replanted tree species grew better was mainly the middle-aged forest, and the stage in which the growth was poor was mainly the mature forest. This shows that trees replanted in the early stage can better adapt to the environment and form a stable root system and canopy structure; replanting in the later stage faces the suppression of the established ecological niche. Improving the quality and efficiency of Chinese fir plantations should be carried out in the middle-aged and young forest stage, and should not exceed the near-mature forest.

[0057] From Example 2, it can be seen that when replanting trees, the soil filling the tree holes is mixed with modified zeolite powder, so that the modified zeolite powder adsorbs and gradually releases fertilizer components, so that there are continuous nutrients for root absorption, which is beneficial to tree growth.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A forest management method for improving the quality and efficiency of Chinese fir plantations, characterized in that: The steps include: Fell some trees in the fir forest to keep the density of the existing forest at 100 trees / hm2. 2 -1050 plants / hm 2 ; Replant precious and native tree species in the gaps between stands, with a planting number of 300 trees / hm2 2 -1260 plants / hm 2 ; The replanted tree species are at least three of Phoebe bournei, Liquidambar formosana, Schima superba, Cinnamomum camphora, Cyclobalanopsis glauca, Taxus chinensis var. mairei, Ginkgo biloba, Schima superba, Magnolia officinalis, Chinaberry and Sapium sebiferum.

2. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 1, characterized in that: The age group of the Chinese fir plantation is at least one of a middle-aged forest, a near-mature forest and a mature forest.

3. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 1, characterized in that: Based on the stand retention density of the transformed Chinese fir plantation, the number of replanted trees of the precious and native tree species shall meet any of the following requirements: The stand density of the transformed Chinese fir plantation is 100 trees / hm2. 2 -250 plants / hm 2 The number of replanted precious and native tree species is 675 trees / hm2 2 -890 plants / hm 2 ; The stand density of the transformed Chinese fir plantation is 500 trees / hm2. 2 -650 plants / hm 2 The number of replanted precious and native tree species is 540 trees / hm2 2 -1260 plants / hm 2 ; The stand retention density of the Chinese fir plantation after transformation is 750 trees / hm2 2 -1050 plants / hm 2 The number of replanted precious and native tree species is 300 trees / hm2 2 -870 plants / hm 2 .

4. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 1, characterized in that: When some trees in a Chinese fir forest are felled, the stand retention density of the transformed Chinese fir plantation after felling shall meet any of the following requirements for different age groups: The Chinese fir plantation is a middle-aged forest, and the density of the stand after transformation is 800 trees / hm2. 2 -1020 plants / hm 2 ; The fir plantation is a near-mature forest, and the density of the stand after transformation is 500 trees / hm2. 2 -600 plants / hm 2 ; The fir plantation is a mature forest, and the density of the stand after transformation is 700 trees / hm2. 2 -800 plants / hm 2 .

5. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 1, characterized in that: For different age groups, the number of replanted precious and native tree species must meet any of the following requirements: The forest is classified as a middle-aged forest, and the number of replanted precious and native tree species is 300 trees / hm2. 2 -600 plants / hm 2 ; The forest is classified as near-mature forest, and the number of replanted precious and native tree species is 540 trees / hm2. 2 -1260 plants / hm 2 ; The forest is classified as mature forest, and the number of replanted precious and native tree species is 675 trees / hm2. 2 -870 plants / hm 2 .

6. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 1, characterized in that: The fir plantation age group is any one of middle-aged forest, near-mature forest and mature forest, and the precious and native tree species to be replanted are at least three of Phoebe fujianensis, Liquidambar formosana, Cyclobalanopsis glauca, Cinnamomum camphora, Taxus chinensis var. mairei, Ginkgo biloba, Schima superba, Magnolia officinalis, Chinaberry and Sapium sebiferum.

7. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 6, characterized in that: The Chinese fir plantation age group is a middle-aged forest, and the ratio of the number of Chinese fir trees to precious and native tree species is (1.5-3):

1.

8. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 6, characterized in that: The fir plantation age group is a nearly mature forest, and the ratio of the number of fir trees to precious and native tree species is 1:(1.0-2).

9. The forest management method for improving the quality and efficiency of Chinese fir plantations according to claim 6, characterized in that: The fir plantation age group is a mature forest, and the ratio of the number of fir trees to precious and native tree species is 1:(1.5-6).

10. A Chinese fir plantation obtained by the forest management method for improving the quality and efficiency of Chinese fir plantations according to any one of claims 1 to 9.

11. Use of the forest management method for improving the quality and efficiency of Chinese fir plantations according to any one of claims 1 to 9 in improving the quality and efficiency of Chinese fir plantations or in transforming low-efficiency forests.

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