CN111226733A - Sustainable management method for dual-purpose forest of pine resin material - Google Patents
Sustainable management method for dual-purpose forest of pine resin material Download PDFInfo
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 8
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 8
- 238000005065 mining Methods 0.000 claims description 7
- 235000004213 low-fat Nutrition 0.000 abstract description 2
- 235000011609 Pinus massoniana Nutrition 0.000 description 9
- 241000018650 Pinus massoniana Species 0.000 description 9
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Abstract
The invention discloses a sustainable management method for a dual-purpose forest of pine resin materials, which comprises the following steps: (1) selecting the upper slope of pine, and collecting the fat by a descending type bilateral fat collection method; a middle ditch is arranged on the longitudinal central line of the cutting surface, and a grease receiving container is arranged at the lower end of the middle ditch to finish the grease collection on the upper slope; (2) selecting a downhill surface of a tree, and adopting a descending type double-lateral ditch two-surface grease collection method to collect grease; a middle ditch is arranged on the longitudinal central line of the cutting surface, and a grease receiving container is arranged at the lower end of the middle ditch to finish the grease collection of the downhill surface of the tree; (3) calculating the total area of resin collection, cutting and selling the pine trees which finish the resin collection on the two sides of the uphill slope and the downhill slope, counting the total value of the sum of the pine resin income and the wood income, and calculating the economic benefit. The method is suitable for middle-long-term fat extraction of pine trees, and solves the problems of backward fat extraction technology, poor stand quality, slow forest growth, low fat yield per unit area, shortened harvesting life, low economic benefit and the like in the traditional fat extraction technology.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of pine tree planting, and particularly relates to a sustainable management method for a dual-purpose forest of pine resin.
[ background of the invention ]
The masson pine grows rapidly and has wide application, is an important soil dominant tree species in the south of China, and supports the development of the 'billions yuan industry and the characteristic dominant' rosin industry 'of papermaking and wood deep processing' in Guangxi. Guangxi is the central producing area of masson pine, and has rich genetic resource and obvious genetic improvement effect. Guangxi is the most important producing area of rosin and rosin in China, the rosin and rosin yield stably stays at the first place of China for many years, and meanwhile, the rosin can provide important economic income besides wood and is the most traditional major bulk forest product source of artificial forests in south China. With the continuous improvement of the pine artificial forest cultivation technology, the area of the forest stand capable of picking resin is increased, the initial tree-picking age of most of the forest stands is advanced, the initial cutting diameter step is smaller, the size of the pine resin cutting surface is pursued eccentrically, the resin-picking frequency is increased, the resin-picking time is prolonged to pursue the yield of the resin, the cutting life of the existing pine resin raw material forest is short, and the goals of sustainable utilization and sustainable development of the forest are difficult to achieve.
The traditional single-side high-load bridging fat-collecting method has the fat-collecting load rate of over 60 percent, the height of collecting and cutting is 4-6m, the height of climbing by bridging is 2-4m, the problems of high risk coefficient and high cost exist, and in addition, the problem of seriously influencing the growth of pine trees also exists in the high-load middle-long term fat-collecting.
[ summary of the invention ]
The invention provides a sustainable management method for a dual-purpose forest of pine resin materials, which aims to solve the problems that the growth of pine trees is not influenced, the large output value of the produced materials is realized, and the goals of sustainable utilization and sustainable development of the forest are realized under the condition of realizing large-degree resin extraction.
In order to solve the technical problems, the invention adopts the following technical scheme:
a sustainable management method for a dual-purpose forest of pine resin materials comprises the following steps:
(1) selecting the upper slope of the pine, and collecting the fat by a descending type bilateral ditch two-side fat collection method; a middle ditch is arranged on the longitudinal central line of the cutting surface, and a resin receiving container is arranged at the lower end of the middle ditch to finish the resin extraction on the upper slope surface of the tree;
(2) selecting a downhill surface of a tree, and adopting a descending type double-lateral ditch two-surface grease collection method to collect grease; a middle ditch is arranged on the longitudinal central line of the cutting surface, and a grease receiving container is arranged at the lower end of the middle ditch to finish the grease collection of the downhill surface of the tree;
(3) calculating the total area of resin collection, cutting the pine trees which finish the resin collection on the front slope and the down slope of the trees, selling, counting the total value of the sum of the income of the pine trees and the income of the wood, and calculating the economic benefit.
Preferably, the diameter at breast height of the pine tree in the step (1) is more than 16 cm.
Preferably, the specific fat extraction parameters in step (1) are carried out according to an area formula (1):
in the formula: sAscending slopeRepresenting the fat-collecting area of the upper slope of the pine; n represents the year of mining and cutting, and n is more than or equal to 1 and less than or equal to 8; d1Representing the diameter of the breast during extraction; dnRepresenting the diameter of breast in the nth harvest year, △ D representing the average increase of the annual diameter of breast, DnIs set as the first item D1The tolerance is △ D, pi is circumference ratio, 3.14 is taken, gamma is the fat-collecting load rate, L is the step pitch value, and D is the number of days of fat collection.
Preferably, the descending slope of the tree is selected in the step (2), and the two sides of the double-lateral ditch are subjected to grease collection by a descending type two-side grease collection method from the ground to the position 1.9-2.1m higher than the tree.
Preferably, the specific fat extraction parameter in the step (2) is performed according to an area formula (2):
in the formula: sDownhill slopeRepresenting the fat-collecting area of the lower slope of the pine tree; n represents the year of mining and cutting, and n is more than or equal to 9 and less than or equal to 16; d1Representing the diameter of the breast during extraction; dn-1Representing the breast diameter of the (n-1) th harvest year, △ D representing the average annual breast diameter growth, DnIs set as the first item D1The tolerance is △ D, pi is the circumferential rate, 3.14 is taken, gamma is the fat-collecting load rate, L is the step pitch value, D is the number of days of fat collection;
preferably, the fat-collecting load rate in the steps (1) and (2) is 41-45%.
Preferably, the total area of fat extracted in step (3) is calculated as follows:
Sgeneral assembly＝SAscending slope+SDownhill slope(3)
In the formula: sGeneral assemblyRepresents the total area of the pitch.
The invention has the following beneficial effects:
(1) the invention is suitable for the middle-term and long-term fat extraction of pine trees, and solves the problems of backward fat extraction technology, poor forest stand quality, slow forest growth, low fat yield per unit area, short harvesting life, low economic benefit and the like in the traditional fat extraction technology.
(2) The method effectively solves the problems that the traditional high-load middle-long-term fat collection seriously affects the growth of the pine trees and needs to be erected and climbed for fat collection, the risk coefficient is high, the personal safety is caused, the cost is high, and the like.
[ description of the drawings ]
FIG. 1 is a first structural diagram of a descending bilateral sulcus fat sampling method;
FIG. 2 is a schematic diagram of a two-sided grease collection method using a descending double-sided ditch;
fig. 3 is a schematic diagram of two faces of a pine tree fat-collecting ascending face and a pine tree fat-collecting descending face.
[ detailed description ] embodiments
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
The invention researches the grease collecting technology and selects better process parameters such as the cutting load rate, the step pitch and the like, thereby providing theoretical and data basis for realizing the purpose of obtaining great economic benefit of grease production and material production.
(I) relationship between different cutting load rates and fat yield
A comparison test of different harvesting load rates and fat yields of 10-year-old masson pines of 16cm diameter steps (the diameter at breast height is 15.0cm-16.9cm) is carried out in a big wu branch log yard in a Town Longlinken farm in the Yangxi county, and 4 load rate treatments of 35%, 40%, 45% and 50% are set. The grease collection analysis is carried out for 3 years continuously, and the test result shows that: (1) in the first year of initial fat collection at the radius of 16cm, the difference of fat yields among different fat collection load rates is obvious, the fat yield is higher when the fat collection load rate is higher, and the fat yields of 50% of the fat collection load rate are respectively improved by 34.75%, 28.94% and 17.62% compared with 35%, 40% and 45%; (2) in the second and third years of fat collection, the difference of the fat yields between different fat collection load rates is obvious in the fat yield, wherein the difference of the fat yields between two groups of 35% and 40% load rates and 45% and 50% load rates is not obvious, the fat yields between the groups are obviously different, and the fat yield between 45% and 50% is obviously 25.36-41.23% lower than the load between 35% and 40%; (3) in the aspect of breast diameter growth amount, annual breast diameter growth amount of 50% of fat collection load rate and 35% of load rate is 0.54cm and 1.24cm respectively, which shows that under the condition of a diameter grade of 16cm for 10 years, the fat collection load rate is not more than 45%, and both the yield of rosin and wood can be achieved.
(II) area formula of mining and cutting
The traditional single-side high-load bridging fat-collecting method has the advantages that the fat-collecting load rate is more than 60%, the height of collecting and cutting is 4-6m, the height of bridging and climbing is 2-4m, the problems of high risk coefficient and high cost exist, in addition, the growth of pine trees is seriously influenced by the high-load medium-long term fat-collecting, the balanced development of fat production and wood production is not favorably realized, and the purpose of obtaining larger economic benefit is achieved. The invention researches the fat-collecting technology, selects the better process parameters such as the collecting and cutting load rate, the step pitch and the like, and adopts a 'two-sided' fat-collecting method to collect fat. The specific formula of the area for sampling the fat is as follows:
in the formula: sAscending slopeRepresenting the fat-collecting area of the upper slope of the pine; n represents the year of mining and cutting, and n is more than or equal to 1 and less than or equal to 8; d1Representing the diameter of the breast during extraction; dnRepresenting the diameter of breast in the nth harvest year, △ D representing the average increase of the annual diameter of breast, DnIs set as the first item D1The tolerance is △ D, pi is circumference ratio, 3.14 is taken, gamma is the fat-collecting load rate, L is the step pitch value, and D is the number of days of fat collection.
In the formula: sDownhill slopeIs shown below the pine treeThe fat sampling area of the slope; n represents the year of mining and cutting, and n is more than or equal to 9 and less than or equal to 16; d1Representing the diameter of the breast during extraction; dn-1Representing the breast diameter of the (n-1) th harvest year, △ D representing the average annual breast diameter growth, DnIs set as the first item D1The tolerance is △ D, pi is circumference ratio, 3.14 is taken, gamma is the fat-collecting load rate, L is the step pitch value, and D is the number of days of fat collection.
SGeneral assembly＝SAscending slope+SDownhill slope(3)
In the formula: sGeneral assemblyRepresents the total area of the pitch.
(III) relationship between cutting step pitch and fat yield of different side ditches
A comparison test of different cutting step distances and fat yield of 10-year-old masson pines is carried out in a big wu branch wood storage yard in a Town Longlinyard in the Yangxian county, and three treatments of 0.1cm, 0.3cm and 0.5cm of lateral ditch cutting step distances are set. The analysis of the test data of 2 years of continuous fat collection shows that: (1) the lipid yield of the treatment rooms with three cutting step distances of 0.1cm, 0.3cm and 0.5cm is slightly different, but the difference does not reach a significant level; (2) although there is no significant difference in the yield of turpentine among 3 different harvesting steps, the 0.3cm and 0.5cm significantly increase the consumption of the cutting surface, which has adverse effects on the growth of the breast diameter and wind resistance, and the harvesting step of 10-year-old masson pine is recommended to be 0.1cm as the best.
According to the invention, the fat-collecting load rate is strictly controlled, a certain amount of bark is reserved for conveying nutrients, and healthy growth of pine trees is realized, so that great economic benefits of fat production and wood production are realized, and the problems that the growth of pine trees is seriously influenced by traditional high-load middle-and-long-term fat collection, the wood production is greatly reduced, and high risk coefficient is high, personal safety is caused, the cost is high and the like due to the fact that the high-load middle-and-long-term fat collection needs to be erected and climbed for fat collection are effectively solved.
On the basis of the above-described optimization parameters, the present invention is explained below by way of more specific examples.
Example 1
Referring to fig. 1, 2 and 3, a sustainable management method for a dual-purpose forest of pine resin material comprises the following steps:
(1) selecting 10-year-old masson pine with a breast diameter of 16.5cm in a division wood storage yard of the big wu in a Town Longlincourt in the horizontal county, collecting resin on the upper slope surface of the tree by a descending type double-lateral ditch two-side resin collection method from a position 2m away from the ground to the height of the tree, wherein the single included angle is 30 degrees, the depth of a cutting ditch into the xylem is 0.3cm, the step distance is 0.1cm, and the wood is collected according to 1 day; a middle ditch is cut at the longitudinal central line of the cutting surface, the cutting length is 30cm, the width is 1.0cm, the depth is 0.5cm, a fat receiving container is installed at the lower end of the middle ditch, the fat receiving container is a plastic cup and is fixed by adopting bamboo products, the fat collecting load rate is 45%, the circumference of the cutting surface is 23.3cm, and the fat collection on the upper slope surface is finished after the continuous fat collection for 8 years;
(2) selecting a downhill surface of a tree, reserving 10cm and 12cm nutrition zones away from an uphill cutting surface respectively, and collecting the resin at a position 2m from the ground to the height of the tree by a descending type double-lateral ditch two-surface resin collection method, wherein the included angle is 30 degrees, the cutting ditch is 0.3cm deep into the xylem, the step distance is 0.1cm, and the resin is collected in 1 day; a middle ditch is cut on the longitudinal central line of the cutting surface, the cutting length is 30cm, the width is 1.0cm, the depth is 0.5cm, a fat receiving container is installed at the lower end of the middle ditch, the fat receiving container is a plastic cup and is fixed by bamboo products, the fat collecting load rate is 41%, the circumference of the cutting surface is 31.5cm, the fat is collected for 8 years continuously, and the fat collection of the downhill surface is finished;
(3) and (3) felling and selling the pine trees which finish the resin picking on the front slope and the back slope of the trees, calculating the resin picking area and the resin yield according to the formulas (1) to (3), counting the total yield of the sum of the pine resin income and the wood income, and calculating the economic benefit.
Example 2
Referring to fig. 1, 2 and 3, a sustainable management method for a dual-purpose forest of pine resin material comprises the following steps:
(1) selecting 10-year-old masson pine with a breast diameter of 16.7cm in a big wu branch wood storage yard in a Town Longlincourt in the horizontal county, adopting a descending type double-lateral ditch two-side grease collection method for collecting grease from the place 1.9m away from the ground to the height of the tree on the upper slope of the tree, wherein the single included angle is 30 degrees, the cutting ditch is 0.3cm deep into the xylem, the step distance is 0.1cm, and 1-day 1 collection is carried out; a middle ditch is cut at the longitudinal central line of the cutting surface, the cutting length is 32cm, the width is 1.2cm, the depth is 0.5cm, a fat receiving container is installed at the lower end of the middle ditch, the fat receiving container is a plastic film bag and is fixed by wood products, the fat collecting load rate is 44%, the circumference of the cutting surface is 23.1cm, and the fat collection on the upper slope surface is finished after the continuous fat collection for 8 years;
(2) selecting a downhill surface of a tree, reserving 11cm and 10cm nutrition zones away from an uphill cutting surface respectively, and collecting the resin at a position 1.9m from the ground to the height of the tree by a descending type double-side ditch two-surface resin collection method, wherein the included angle is 30 degrees, the depth of a cutting ditch into a xylem is 0.3cm, the step distance is 0.1cm, and the resin is collected according to 1 day; a middle ditch is cut on the longitudinal central line of the cutting surface, the cutting length is 32cm, the width is 1.2cm, the depth is 0.5cm, a grease receiving container is installed at the lower end of the middle ditch, the grease receiving container is a plastic film bag and is fixed by wood products, the grease collecting load rate is 43 percent, the perimeter of the cutting surface is 33.3cm, grease is collected continuously for 8 years, and grease collection on the downhill surface is completed;
(3) felling the pine trees which finish the resin picking on the front slope and the lower slope of the trees, calculating the resin picking area and the resin yield according to the formulas (1) to (3), counting the total yield of the sum of the pine resin income and the wood income, and calculating the economic benefit.
Example 3
Referring to fig. 1, 2 and 3, a sustainable management method for a dual-purpose forest of pine resin material comprises the following steps:
(1) selecting 10-year-old masson pine with a breast diameter of 17.3cm in a big wu branch wood storage yard in a Town Longlincourt in the horizontal county, adopting a descending type double-lateral ditch two-side grease collection method for collecting grease from a place 2.1m away from the ground to a tree height on the upper slope of the tree, wherein the single included angle is 30 degrees, the cutting ditch is 0.3cm deep into the xylem, the step distance is 0.1cm, and 1-day 1 collection is carried out; a middle ditch is cut at the longitudinal central line of the cutting surface, the cutting length is 36cm, the width is 1.3cm, the depth is 0.5cm, a fat receiving container is installed at the lower end of the middle ditch, the fat receiving container is a plastic cup and is fixed by bamboo products, the fat collecting load rate is 45%, the circumference of the cutting surface is 24.4cm, and the fat collection on the upper slope surface is completed after the continuous fat collection for 8 years;
(2) selecting a downhill surface of a tree, reserving 12cm and 11cm nutrition zones away from an uphill cutting surface respectively, and collecting the resin at a position 2.1m from the ground to the height of the tree by a descending type double-side ditch two-surface resin collection method, wherein the included angle is 30 degrees, the depth of a cutting ditch into a xylem is 0.3cm, the step distance is 0.1cm, and the resin is collected in 1 day; a middle ditch is cut on the longitudinal central line of the cutting surface, the cutting length is 35cm, the width is 1.2cm, the depth is 0.5cm, a fat receiving container is installed at the lower end of the middle ditch, the fat receiving container is a plastic cup and is fixed by adopting bamboo products, the fat collecting load rate is 42%, the circumference of the cutting surface is 33.4cm, the fat is collected continuously for 8 years, and the fat collection of the downhill surface is completed;
(3) and (3) felling the pine trees which finish the resin picking on the front downhill surface of the trees, selling, calculating the resin picking area and the resin yield according to the formulas (1) to (3), counting the total value of the sum of the pine resin income and the wood income, and calculating the economic benefit.
Comparative example
Adopting a traditional high-load medium-and-long-term fat extraction method to extract fat:
(1) selecting 10-year-old masson pine with a breast diameter of 16.6cm in a division wood storage yard of the Dawu in the Longlincourt of the Yangxian county, collecting the grease according to a descending grease collecting method from the ground to a position 2m higher than the tree, carrying out single included angle of 30 degrees, enabling a cutting ditch to be deep into xylem by 0.3cm, enabling the step pitch to be 0.1cm, and collecting 1 day by 1; a middle ditch is cut on the longitudinal central line of the cutting surface, the cutting length is 30cm, the width is 1.0cm, the depth is 0.5cm, a fat receiving container is arranged at the lower end of the middle ditch, the fat receiving container is a plastic cup and is fixed by adopting bamboo products, the fat collecting load rate is 60%, the circumference of the cutting surface is 31.3cm, and the fat collecting period is 8 years;
(2) building a wooden ladder about 2m on a cutting surface, selecting a position 4m away from the ground to the height of a tree, adopting a descending type fat extraction method to extract fat, forming a single included angle of 30 degrees, enabling a cutting ditch to be 0.3cm deep into the xylem, enabling the step pitch to be 0.1cm, and extracting 1 day by 1; a middle ditch is cut on the longitudinal central line of the cutting surface, the cutting length is 30cm, the width is 1.0cm, the depth is 0.5cm, a fat receiving container is arranged at the lower end of the middle ditch, the fat receiving container is a plastic cup and is fixed by adopting bamboo products, the fat collecting load rate is 65%, the circumference of the cutting surface is 42cm, and the fat collecting period is 8 years;
(3) and (4) felling the pine trees which finish the resin collection, counting the total yield of the sum of the pine resin income and the wood income, and calculating the economic benefit.
The economic benefits per acre of examples 1-3 and comparative example 1 were counted as shown in table 1.
| Experimental project | Pine resin income (Wanyuan) | Wood income (Wanyuan) | Total income (Wanyuan) |
| Example 1 | 1.298 | 1.439 | 2.737 |
| Example 2 | 1.269 | 1.472 | 2.741 |
| Example 3 | 1.443 | 1.572 | 3.015 |
| Comparative example | 1.503 | 0.810 | 2.313 |
From the above table, it can be seen that: the total revenue was increased by 18.33%, 18.50% and 30.35% for the comparative examples using the methods of examples 1-3, respectively. In addition, the method of the embodiment 1-3 is adopted, and the fat sampling is carried out without the need of building a frame and climbing, so that the danger coefficient is reduced, the personal safety of forest farmers is improved, and the fat sampling efficiency is obviously improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A sustainable management method for a dual-purpose forest of pine resin materials is characterized by comprising the following steps:
(1) selecting the upper slope of pine, and collecting the fat by a descending type bilateral fat collection method; a middle ditch is arranged on the longitudinal central line of the cutting surface, and a grease receiving container is arranged at the lower end of the middle ditch to finish the grease collection on the upper slope;
(2) selecting a downhill surface of a tree, and adopting a descending type double-lateral ditch two-surface grease collection method to collect grease; a middle ditch is arranged on the longitudinal central line of the cutting surface, and a grease receiving container is arranged at the lower end of the middle ditch to finish grease collection on the downhill surface;
(3) calculating the total area of resin picking, cutting and selling the pine trees which finish the resin picking on the front slope and the down slope of the trees, counting the total value of the sum of the income of the pine trees and the income of the wood, and calculating the economic benefit.
2. The method according to claim 1, wherein the diameter at breast height of the pine tree in step (1) is 16cm or more.
3. The method of claim 1, wherein the specific parameters for the production of the rosin-derived forest in step (1) are determined according to the area formula (1):
in the formula: sAscending slopeRepresenting the fat-collecting area of the upper slope of the pine; n represents the year of mining and cutting, and n is more than or equal to 1 and less than or equal to 8; d1Representing the diameter of the breast during extraction; dnRepresenting the diameter of breast in the nth harvest year, △ D representing the average increase of the annual diameter of breast, DnIs set as the first item D1The tolerance is △ D, pi is circumference ratio, 3.14 is taken, gamma is the fat-collecting load rate, L is the step pitch value, and D is the number of days of fat collection.
4. The method of claim 1, wherein the descending slope of the tree is selected in the step (2) and the resin is collected by a descending type bilateral ditch two-sided resin collection method from the ground to a height of 1.9-2.1m from the tree.
5. The method of claim 1, wherein the specific resin production parameters in step (2) are determined according to the area formula (2):
in the formula: sDownhill slopeRepresenting the fat-collecting area of the lower slope of the pine tree; n represents the year of mining and cutting, and n is more than or equal to 9 and less than or equal to 16; d1Representing the diameter of the breast during extraction; dn-1Representing the breast diameter of the (n-1) th harvest year, △ D representing the average annual breast diameter growth, DnIs set as the first item D1The tolerance is △ D, pi is circumference ratio, 3.14 is taken, gamma is the fat-collecting load rate, L is the step pitch value, and D is the number of days of fat collection.
6. The method of claim 1, wherein the loading rate of the collected resin in the steps (1) and (2) is 41-45%.
7. The method of claim 1, wherein the total area of extracted resin calculated in step (3) is calculated as follows:
Sgeneral assembly＝SAscending slope+SDownhill slope(3)
In the formula: sGeneral assemblyRepresents the total area of the pitch.
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| CN105354625A (en) * | 2015-10-12 | 2016-02-24 | 北京林业大学 | Method for realizing optimal forest selective cutting model |
| CN109362467A (en) * | 2018-12-17 | 2019-02-22 | 许承荣 | The business method of Masson Pine Plantation |
| CN110432112A (en) * | 2019-08-01 | 2019-11-12 | 王挺良 | A kind of Forest Cultivation method of soil fertility nature getting fat, high value sustainable fast growing forever |
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|---|---|---|---|---|
| CN105354625A (en) * | 2015-10-12 | 2016-02-24 | 北京林业大学 | Method for realizing optimal forest selective cutting model |
| CN109362467A (en) * | 2018-12-17 | 2019-02-22 | 许承荣 | The business method of Masson Pine Plantation |
| CN110432112A (en) * | 2019-08-01 | 2019-11-12 | 王挺良 | A kind of Forest Cultivation method of soil fertility nature getting fat, high value sustainable fast growing forever |
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