CN117044554B - Directional cultivation method for fir large-diameter material - Google Patents
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- 239000000463 material Substances 0.000 title claims abstract description 72
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- 239000002023 wood Substances 0.000 claims abstract description 90
- 238000005520 cutting process Methods 0.000 claims abstract description 34
- 230000014759 maintenance of location Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000003306 harvesting Methods 0.000 claims abstract description 17
- 241000196324 Embryophyta Species 0.000 description 9
- 238000009825 accumulation Methods 0.000 description 6
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- TUZYXOIXSAXUGO-UHFFFAOYSA-N Pravastatin Natural products C1=CC(C)C(CCC(O)CC(O)CC(O)=O)C2C(OC(=O)C(C)CC)CC(O)C=C21 TUZYXOIXSAXUGO-UHFFFAOYSA-N 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- TUZYXOIXSAXUGO-PZAWKZKUSA-N pravastatin Chemical compound C1=C[C@H](C)[C@H](CC[C@@H](O)C[C@@H](O)CC(O)=O)[C@H]2[C@@H](OC(=O)[C@@H](C)CC)C[C@H](O)C=C21 TUZYXOIXSAXUGO-PZAWKZKUSA-N 0.000 description 1
- 229960002965 pravastatin Drugs 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
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Abstract
The invention relates to the technical field of forestry, in particular to a method for directionally cultivating fir large-diameter materials, which comprises the following steps: s1, planting fir wood forest according to a preset site index and a preset initial planting density; the preset floor index is in a preset index range; the preset initial planting density is within a preset initial planting density range; s2, performing first intermediate cutting on the planted fir wood according to the preset first intermediate cutting age, enabling the planted fir wood to keep preset stand retention density, and further, harvesting fir wood meeting the preset main cutting age in a main cutting time period of the planted fir wood to obtain the fir wood large-diameter wood harvesting amount of the planted fir wood.
Description
Technical Field
The invention relates to the technical field of forestry, in particular to a method for directionally cultivating fir large-diameter materials.
Background
Large diameter wood is a shortage of wood species that affects the structural contradiction of wood supply in China. China fir grows in the whole subtropical zone, the tropical zone northern margin, the warm temperate zone south edge and other climatic regions in China, the cultivation area reaches 1.49 hundred million mu, the accumulation amount reaches 7.55 hundred million m 3, and the China fir accounts for about 1/4 and 1/3 of the main dominant tree species of the national artificial arbor and forest respectively, and is an important quick-growing rural needle-leaved wood species in China.
However, due to the long cultivation period of fir, the existing cultivation technology lacks long-term positioning research on formation of large-diameter fir in the complete round-cut period and system integration analysis of the cultivation technology of large-diameter wood in different production areas, and therefore the yield of the large-diameter wood obtained by the existing cultivation method of fir is not high.
Disclosure of Invention
In view of the above-mentioned shortcomings and disadvantages of the prior art, the present invention provides a method for directional cultivation of fir large-diameter materials, which solves the technical problem that the yield of the large-diameter materials obtained by the existing cultivation method for fir is not high.
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
the embodiment of the invention provides a method for directionally cultivating fir large-diameter materials, which comprises the following steps:
S1, planting fir wood forest according to a preset site index and a preset initial planting density;
The preset floor index is in a preset index range;
the preset initial planting density is within a preset initial planting density range;
S2, performing first intermediate cutting on the planted fir wood according to the preset first intermediate cutting age, enabling the planted fir wood to keep preset stand retention density, and further, harvesting fir wood meeting the preset main cutting age in a main cutting time period of the planted fir wood to obtain the fir wood large-diameter wood harvesting amount of the planted fir wood.
Preferably, the method comprises the steps of,
The preset site index range is 14-28 index stages;
the preset initial planting density range is 111-222 plants/mu.
Preferably, the method comprises the steps of,
The preset first-time meta-validleness is calculated by adopting a formula (1) in advance;
The formula (1) is:
Y＝17.911-0.001a-0.35b；
Wherein Y is the first metavalidleness;
a is the initial planting density; b is the floor index.
Preferably, the method comprises the steps of,
The preset main forest age is in the range of a first forest age interval;
The first forest age interval is [22, 50].
Preferably, the method comprises the steps of,
The preset main cutting age is calculated by adopting a formula (2) based on the preset site index in advance;
the formula (2) is:
W＝168.29e-0.08b；
W is the age of main varactors;
b is the floor index.
Preferably, the method comprises the steps of,
The preset stand retention density is in a first density interval range;
The first density interval is [45, 85].
Preferably, the method comprises the steps of,
The preset stand retention density is calculated by adopting a formula (3) based on the preset site index in advance;
the formula (3) is:
E＝0.1507b2－8.9281b+182.65；
E is the stand retention density;
b is the floor index.
Preferably, before S1, the method includes:
Obtaining a statistical dataset comprising a plurality of pieces of pattern data;
The statistical data set includes: performing 18 surveys on 15 fixed plots located in the forest farm of Shao Wuwei min of Fujian province to obtain 270 plot data; and, carrying out 13 surveys on 15 fixed plots located in a Tropical forest experiment center Fubo forest farm of the Chinese forest sciences of Guangxi Zhuang nationality pingxiang, and obtaining 195 plot data;
Counting the plurality of pieces of land data according to different land indexes to obtain an average value of stand retention densities of lands meeting a first preset condition and a second preset condition at the same time corresponding to the specified land indexes;
The specified floor index includes: 10. 12, 14, 16, 18, 20, 22, 24, 26, 28;
the first preset condition is that the yield of the large-diameter material reaches more than 50%;
the second preset condition is that the volume of the large-diameter material is more than 200m 3/hm2;
fitting the average value of the stand retention densities of the plots meeting the first preset condition and the second preset condition simultaneously corresponding to the opposite ground indexes to obtain a formula (3);
Wherein the pattern data comprises a pattern: floor index, initial planting density, forest age, stand retention density, average breast diameter, average tree height, large diameter material yield and total accumulation.
Preferably, before S1, the method includes:
Obtaining a statistical dataset comprising a plurality of pieces of pattern data;
The statistical data set includes: performing 18 surveys on 15 fixed plots located in the forest farm of Shao Wuwei min of Fujian province to obtain 270 plot data; and, carrying out 13 surveys on 15 fixed plots located in a Tropical forest experiment center Fubo forest farm of the Chinese forest sciences of Guangxi Zhuang nationality pingxiang, and obtaining 195 plot data;
wherein the pattern data comprises a pattern: floor index, primary planting density, forest age, stand retention density, average breast diameter, average tree height, large diameter material yield and total accumulation;
Counting the multiple pieces of sample plot data according to different site indexes to obtain fitting functions of forest age and large-diameter material yield corresponding to the specified site indexes;
The specified floor index includes: 10. 12, 14, 16, 18, 20, 22, 24, 26, 28;
setting the wood age corresponding to the specified site index and the large-diameter wood yield in the fitting function of the large-diameter wood yield to be 50%, and obtaining a specific numerical value of the wood age corresponding to the specified site index when the large-diameter wood yield is 50%;
fitting the specific numerical value of the forest age corresponding to the specified site index with the specified site index to obtain a formula (2).
Preferably, the method comprises the steps of,
When the floor index is 10, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.0079x2－0.2079x+1.0803；
x is forest age;
r is the yield of the large-diameter material;
When the floor index is 12, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.0115x2+0.109x－3.4188；
When the floor index is 14, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.012x2+0.2729x－5.2405；
when the standing index is 16, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝1.3276x－11.139；
when the floor index is 18, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝45.903log(x)－101.49；
When the floor index is 20, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.0505x2+0.0894x－3.8103；
when the floor index is 22, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.0176x2+1.5353x－15.761；
When the standing index is 24, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝2.9869x－26.141；
when the floor index is 26, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝-0.2697x2+16.861x－188.19；
when the standing index is 28, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝-0.4283x2+24.397x－268.86。
the beneficial effects of the invention are as follows: according to the method for directionally cultivating the fir wood large-diameter material, the fir wood is planted according to the preset site index and the preset initial planting density, then the planted fir wood is subjected to first thinning according to the preset first thinning age, the planted fir wood is enabled to keep the preset stand retaining density, and further, in the main thinning time period of the planted fir wood, the harvest is carried out on the fir wood meeting the preset main thinning age, and the fir wood large-diameter material harvest quantity of the planted fir wood is obtained. The directional cultivation method of the fir large-diameter wood improves the yield of the fir large-diameter wood of the planted fir forest.
Drawings
FIG. 1 is a flowchart of a method for directional cultivation of fir large-diameter wood according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for directional cultivation of fir large-diameter wood provided in the second embodiment of the invention.
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
Referring to fig. 1, the embodiment provides a method for directional cultivation of fir large-diameter wood, which includes:
S1, planting fir wood forest according to a preset site index and a preset initial planting density.
The preset floor index is in a preset index range; the preset site index range is 14-28 index grade.
The preset initial planting density is within a preset initial planting density range; the preset initial planting density range is 111-222 plants/mu.
S2, performing first intermediate cutting on the planted fir wood according to the preset first intermediate cutting age, enabling the planted fir wood to keep preset stand retention density, and further, harvesting fir wood meeting the preset main cutting age in a main cutting time period of the planted fir wood to obtain the fir wood large-diameter wood harvesting amount of the planted fir wood.
Wherein the preset first-time meta-validleness is calculated by adopting a formula (1) in advance; the formula (1) is:
Y＝17.911-0.001a-0.35b。
Wherein Y is the first metavalidleness; a is the initial planting density (plants/hectare); b is the floor index.
In a specific embodiment, the preset main cutting forest age is in the range of the first forest age interval; the first forest age interval is [22, 50].
In another specific embodiment, the preset main lumber age is calculated in advance based on the preset floor index by using formula (2); the formula (2) is:
W＝168.29e-0.08b；
W is the age of main varactors; b is the floor index.
In a practical application of a specific embodiment, the preset stand retention density is within a first density interval; the first density interval is [45, 85] (strain/mu).
Or in another practical application of the specific embodiment, the preset stand retention density is calculated in advance based on the preset site index by adopting a formula (3); the formula (3) is:
E＝0.1507b2－8.9281b+182.65；
E is the stand retention density; b is the floor index.
According to the method for directionally cultivating the fir wood large-diameter material, the fir wood is planted according to the preset site index and the preset initial planting density, then the planted fir wood is subjected to first thinning according to the preset first thinning age, the planted fir wood is enabled to keep the preset stand retaining density, and further, in the main thinning time period of the planted fir wood, the harvest is carried out on the fir wood meeting the preset main thinning age, and the fir wood large-diameter material harvest quantity of the planted fir wood is obtained. The directional cultivation method of the fir large-diameter wood improves the yield of the fir large-diameter wood of the planted fir forest.
Example two
Referring to fig. 2, the embodiment provides a method for directional cultivation of fir large-diameter wood, which includes:
101. Acquiring a statistical data set, wherein the statistical data set comprises a plurality of pieces of sample plot data; counting a plurality of pieces of sample plot data according to different site indexes to obtain average values of the stand retention densities of the sample plots which simultaneously meet a first preset condition and a second preset condition and correspond to each site index, and fitting the average values of the stand retention densities of the sample plots which simultaneously meet the first preset condition and the second preset condition and correspond to the opposite site indexes to obtain a formula (3);
the formula (3) is:
E＝0.1507b2－8.9281b+182.65；
E is the stand retention density; b is the floor index.
The specified floor index includes: 10. 12, 14, 16, 18, 20, 22, 24, 26, 28.
The first preset condition is that the yield of the large-diameter material reaches more than 50%; the second preset condition is that the volume of the large-diameter material is more than 200m 3/hm2.
Wherein the pattern data comprises a pattern: floor index, initial planting density, forest age, stand retention density, average breast diameter, average tree height, large diameter material yield and total accumulation.
102. Obtaining a statistical dataset comprising a plurality of pieces of pattern data; and counting the plurality of pieces of sample plot data according to different site indexes to obtain a fitting function of the large-diameter material yield corresponding to the specified site indexes, setting the large-diameter material yield in the fitting function of the large-diameter material yield corresponding to the specified site indexes to be 50%, obtaining a specific numerical value of forest age corresponding to the specified site indexes when the large-diameter material yield is 50%, and fitting the specific numerical value of forest age corresponding to the specified site indexes and the specified site indexes to obtain the formula (2).
The formula (2) is:
W＝168.29e-0.08b；
W is the age of main varactors; b is the floor index.
Wherein the pattern data comprises a pattern: floor index, initial planting density, forest age, stand retention density, average breast diameter, average tree height, large diameter material yield and total accumulation. The specified floor index includes: 10. 12, 14, 16, 18, 20, 22, 24, 26, 28.
In step 101 and step 102, when the floor index is 10, the fitting function of the corresponding forest age and the large diameter material yield is: r=0.0079 x 2 -0.2079x+1.0803; x is forest age; r is the yield of the large-diameter material.
When the floor index is 12, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.0115x2+0.109x－3.4188。
When the floor index is 14, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.012x2+0.2729x－5.2405。
when the standing index is 16, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝1.3276x－11.139。
when the floor index is 18, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝45.903log(x)－101.49。
When the floor index is 20, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.0505x2+0.0894x－3.8103。
when the floor index is 22, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝0.0176x2+1.5353x－15.761。
When the standing index is 24, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝2.9869x－26.141。
when the floor index is 26, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝-0.2697x2+16.861x－188.19。
when the standing index is 28, the fitting function of the corresponding forest age and the large-diameter material yield is as follows:
R＝-0.4283x2+24.397x－268.86。
In this embodiment, there is no sequence between step 101 and step 102.
The statistical data set in this embodiment includes: performing 18 surveys on 15 fixed plots located in the forest farm of Shao Wuwei min of Fujian province to obtain 270 plot data; and carrying out 13 surveys on 15 fixed plots located in the Tropical forest experiment center Fubo forest farm of the Chinese forest sciences of Guangxi Zhuang nationality pingxiang, and obtaining 195 plot data.
For example, the statistical data set in the present embodiment includes: performing 18 surveys on 15 fixed plots located in the forest farm of Shao Wuwei min of Fujian province to obtain 270 plot data; and carrying out 13 surveys on 15 fixed plots of the Fubo forest farm at the tropical forestry experiment center of the Chinese forest sciences of Guangxi Zhuang nationality pingxiang, obtaining 195 plot data, and obtaining 1044 plot data in total from different site indexes, different reserved densities and fir artificial forest actual stand of different ages of the provinces of Guangxi Zhuang nationality, hunan, jiangxi and the like of a central output area. Wherein, 1044 chunk data cases are seen in table 1:
TABLE 1
With respect to plot data, the land index of the fixed plot was calculated using the average height of the dominant woods of the 20a season stand. The site index of the temporary sample plot is obtained by looking up the corresponding fir site index table of the average forest age of the stand and the dominant wood, and when the range of the forest age of the site index table is exceeded, the site index equation of the region guide curve conversion of the sample plot is adopted for calculation.
In the sample plot data, the volume of the large-diameter material is calculated by a volume calculation method in China fir management table and optimization density control research.
The total accumulation amount in the pattern data is obtained based on the subtotal binary volume table and the number of stand reserved strains.
103. Planting fir wood forest according to a preset site index and a preset initial planting density; the preset floor index is in a preset index range; the preset site index range is 14-28 index stages; the preset initial planting density is within a preset initial planting density range; the preset initial planting density range is 111-222 plants/mu.
In this example, by analysis of 1044 pieces of plot data, it was surprisingly found that the mass of fir stand large diameter wood output increased significantly with increasing floor index, and that the rate of such increase was higher in the high floor index range than in the low floor index range. And surprisingly, it was found that when the floor index is more than 14 index, a large proportion of samples can be produced with a large diameter of more than 200m 3/hm2, so that the preset floor index range in this example starts from 14 index.
In this embodiment, by analyzing 1044 pieces of plot data, it is surprisingly shown that when the plot is at a relatively low-index level, the initial planting density has less influence on the yield of large-diameter wood, and when the plot is at a higher-index level (20-22 index level), the smaller the initial planting density is, the larger the yield of large-diameter wood is under the same index level condition, and the higher the plot index level is, the stronger the promotion effect of the low density on the growth of large-diameter wood is, the higher the high density above 300 plants/mu has serious restriction on the yield of large-diameter wood, and the density setting range of density test forest and the common planting density in production practice are comprehensively considered, so that the proper planting density for cultivating the large-diameter fir wood can be designed to be in the range of 111 plants/mu to 222 plants/mu.
104. And (3) performing first intermediate cutting on the planted fir forest according to the preset first intermediate cutting age, and enabling the planted fir forest to keep the preset stand retention density, and further, harvesting the fir meeting the preset main cutting age in the main cutting time period of the planted fir forest to obtain the fir large-diameter wood harvesting amount of the planted fir forest.
The preset first-time meta-validleness is calculated by adopting a formula (1) in advance;
The formula (1) is:
Y＝17.911-0.001a-0.35b；
Wherein Y is the first metavalidleness; a is the initial planting density (plants/hectare); b is the floor index.
In a specific embodiment, the predetermined pravastatin age is calculated in advance based on the predetermined floor index using formula (2).
The formula (2) is:
W＝168.29e-0.08b；
W is the age of main varactors; b is the floor index.
In this embodiment, according to 1044 pieces of plot data, the upper and lower limit ranges of the actual forest stand ages satisfying the large diameter material yield reaching more than 50% and the yield reaching more than 200m 3/hm2 are counted according to the ground index level, see table 2, and further according to the principle that the first preset condition and the second preset condition are satisfied simultaneously and the fastest, the method of taking the upper value of 2 lower limit values and the lower value of 2 upper limit values when the same ground index level is adopted, so as to obtain the actual forest stand age ranges of different index levels when the first preset condition and the second preset condition are satisfied simultaneously, and the forest age ranges can be regarded as the actual main cut forest age ranges.
In order to more representatively and rationally determine the main cutting forest age, an optimal relation model of the yield of the large-diameter wood of the different site exponential woods and the forest age is constructed, and the expression form of the fitting function is not completely consistent when the exponential is different. For example, when the floor index is 10, the fitting function of the corresponding forest age and the large diameter material yield is: r=0.0079 x 2 -0.2079x+1.0803; x is forest age; r is the yield of the large-diameter material. When the floor index is 12, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r=0.0115 x 2 +0.109x-3.4188. When the floor index is 14, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r=0.012 x 2 +0.2729x-5.2405. When the standing index is 16, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r= 1.3276x-11.139. When the floor index is 18, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r= 45.903log (x) -101.49. When the floor index is 20, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r=0.0505 x 2 +0.0894x-3.8103. When the floor index is 22, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r=0.0176 x 2 +1.5353x-15.761. When the standing index is 24, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r= 2.9869x-26.141. When the floor index is 26, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r= -0.2697x 2 +16.861x-188.19. When the standing index is 28, the fitting function of the corresponding forest age and the large-diameter material yield is as follows: r= -0.4283x 2 +24.397x-268.86. Then, setting the R value in the relation model of the yield and the forest age of the large-diameter material corresponding to the forest stand corresponding to each site index as 50%, and obtaining the corresponding reference main tree forest age of different index sites, and then reconstructing the optimal power function relation between the series of main tree forest age values and the corresponding site indexes, namely the formula (2). The suitable forest stand main cut age of the fir large-diameter material cultivation can be obtained by substituting the formula (2) into the forest stand site index grade.
TABLE 2
In another embodiment, the predetermined main cutting forest age is within a first forest age range; the first forest age interval is [22, 50].
In this embodiment, by analyzing 1044 pieces of sample plot data, it was surprisingly found that the variation interval of the forest stand forest age of the sample plot with the yield of the large diameter wood of the forest stand reaching 50% or more is [22, 60], while the variation interval of the forest stand forest age of the sample plot with the yield of the large diameter wood of the forest stand reaching 200m 3/hm2 or more is [21, 60], it was found that the actual range of the forest stand forest ages respectively meeting the first preset condition and the second preset condition is relatively close, and the variation interval of the forest stand forest ages meeting the first preset condition and the second preset condition is [22, 60].
In this embodiment, the forest stand alone index of 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 is brought into the above formula (2), and the standard value of the suitable forest stand main cutting forest age of the fir tree large diameter wood cultivation corresponding to the forest stand alone index of 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 is obtained, namely the last column of "standard main cutting forest age" in table 2, and then the variation interval [22-50] of the standard main cutting forest age of the 14-28 stand alone index is taken as the first forest age interval.
In one embodiment, the preset stand retention density is within a first density interval; the first density interval is [45, 85] plants/mu.
In this embodiment, when the stand retention density is within the first density interval, it can be ensured that the stand has a higher large-diameter material yield and a higher material yield at the time of main cutting, that is, can satisfy the first preset condition and the second preset condition.
In another embodiment, the preset stand retention density is calculated in advance based on the preset site index using formula (3);
the formula (3) is:
E＝0.1507b2－8.9281b+182.65；
E is the stand retention density; b is the floor index.
In this embodiment, the variation ranges of the actual stand retention densities satisfying the large diameter material yield reaching more than 50% and the material yield reaching more than 200m 3/hm2 are counted according to the ground index level respectively, see table 3, and then the actual stand retention densities of the different index levels are obtained according to the condition that the first preset condition and the second preset condition are satisfied simultaneously. Meanwhile, the actual stand retention densities of different site indexes meeting the first preset condition and the second preset condition have certain randomness, and then a quantity relation formula, namely formula (3), with the average value as a dependent variable and the site index grade as an independent variable is constructed.
TABLE 3 Table 3
According to the method for directionally cultivating the fir wood large-diameter material, the fir wood is planted according to the preset site index and the preset initial planting density, then the planted fir wood is subjected to first interval cutting according to the preset first interval cutting age, the planted fir wood is enabled to keep the preset stand retaining density, and further, in the main cutting time period of the planted fir wood, the fir wood meeting the preset main cutting age is subjected to cutting, and the fir wood large-diameter material harvest quantity of the planted fir wood is obtained. The directional cultivation method of the fir large-diameter wood improves the yield of the fir large-diameter wood of the planted fir forest.
The method for directionally cultivating the fir large-diameter material provided by the embodiment actually determines the suitable site index range and the suitable planting density of cultivation of the fir large-diameter material in the afforestation stage, then determines the first-time m-cut forest age and the stand retaining density in the afforestation stage, and determines the harvest factors such as the stand main-cut forest age in the harvest stage.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.
In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.
Claims (1)
1. The method for directionally cultivating the fir large-diameter material is characterized by comprising the following steps of:
S1, planting fir wood forest according to a preset site index and a preset initial planting density;
The preset floor index is in a preset index range;
the preset initial planting density is within a preset initial planting density range;
S2, performing first intermediate cutting on the planted fir wood according to the preset first intermediate cutting age, enabling the planted fir wood to keep preset stand retention density, and further, harvesting fir wood meeting the preset main cutting age in a main cutting time period of the planted fir wood to obtain the fir wood large-diameter wood harvesting amount of the planted fir wood;
the preset site index range is 14-28 index stages;
the preset initial planting density range is 111-222 plants/mu;
the preset first-time meta-validleness is calculated by adopting a formula (1) in advance;
The formula (1) is:
Y＝17.911-0.001a-0.35b；
Wherein Y is the first metavalidleness;
a is the initial planting density; b is the floor index;
the preset main cutting age is calculated by adopting a formula (2) based on the preset site index in advance;
the formula (2) is:
W＝168.29e-0.08b；
W is the age of main varactors;
b is the floor index;
the preset stand retention density is calculated by adopting a formula (3) based on the preset site index in advance;
the formula (3) is:
E＝0.1507b2－8.9281b+182.65；
E is the stand retention density;
b is the floor index.
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