CN110622765A - Method for introducing and afforesting pinus sylvestris in difficult-to-erect areas of Tibet - Google Patents
Method for introducing and afforesting pinus sylvestris in difficult-to-erect areas of Tibet Download PDFInfo
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Abstract
The invention discloses a pinus sylvestris introduction afforestation method in a difficult-to-erect region in Tibet, which comprises the steps of building sand barriers, replacing soil in large pits, strong seedling deep planting, watering and laminating films, and mixed crossing and insect prevention. The invention can effectively reduce the harm of wind erosion and sand burying, improve the conditions of water and nutrients, obviously improve the survival rate and the preservation rate of the pinus sylvestris planted in the Tibet area and enrich the biological diversity of the Tibet area.
Description
Technical Field
The invention relates to the technical field of forestry cultivation, in particular to a method for introducing and afforesting difficult-to-erect pinus sylvestris in Tibet areas.
Background
The Qinghai-Tibet plateau is an area with very weak natural environment, and Tibet is the main body of the Qinghai-Tibet plateau and is an important ecological safety barrier in China, so that the overall afforestation effect is very important for the ecological safety in China. The method is characterized in that drought and cold conditions in the plateau area are poor, the natural environment conditions are poor, the selection of afforestation tree species is required to have strong drought resistance, sand resistance, freezing resistance, barren resistance and other capabilities, the currently selected afforestation tree species are single, willows and poplar are mainly used, the evergreen tree species are extremely low in selectivity, conifers suitable for large-area afforestation in high-altitude areas of Tibet are rarely seen, and the lack of greenness and the oxygen content in the air are extremely low after the leaves of broad-leaved trees in winter season are fallen.
Pinus sylvestris var mongolica Litv, evergreen conifer, belonging to deep-rooted tree species, has extremely strong adaptability, has low requirement on soil, and can grow in various soil environments such as windy sandy soil, gravelly coarse sandy soil, chestnut calcareous soil and the like. Is naturally distributed in the great Khingan mountains and Hulunbei Shadi grasslands of China. Because the pinus sylvestris has strong cold resistance and stress resistance, the pinus sylvestris has the possibility of introduction in the Qinghai-Tibet plateau area.
At present, there is no report of introduction of pinus sylvestris to the Qinghai-Tibet plateau, so a method for introduction and cultivation of pinus sylvestris is urgently to be explored, which contributes great strength to vegetation restoration and ecological construction of the Qing-Tibet plateau.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for planting pinus sylvestris in a difficult-to-erect area of the Tibet region, which can improve the survival rate and the preservation rate of pinus sylvestris planted in the Tibet plateau area and enrich the variety of species in the Tibet region.
The invention solves the technical problems by the following technical means:
a camphor tree pine introduction afforestation method in a difficult-to-stand area in Tibet comprises the steps of building sand barriers, replacing soil in large pits, deep planting strong seedlings and watering and laminating films.
Further, the camphor pine introduction afforestation method comprises the following steps,
s1: setting up a sand barrier, wherein the planting time of pinus sylvestris is spring or autumn, setting up the sand barrier before afforestation, the direction of the sand barrier is vertical to the main wind direction, the sand barrier is set up to be a vertical sand barrier or a horizontal sand barrier according to the terrain and the environment condition of afforestation, and the vertical sand barrier or the horizontal sand barrier can be set to be a strip-shaped sand barrier or a grid sand barrier according to the flowing degree of surface sand; the pinus sylvestris can be planted in spring and autumn, mainly in spring, after the soil is unfrozen in spring, the temperature gradually rises, the sap begins to flow, but the young shoots are planted after sprouting, and the survival rate is obviously reduced after the young shoots sprout; the sand barrier is erected, so that the damage of wind erosion and sand burying can be effectively reduced, and the afforestation preservation rate and the forest growth amount are obviously improved.
S2: changing soil in the big pits, and planting in the introduction field according to the planting density of 22 plants/667 m2Digging planting holes, wherein the length of each planting hole is 40-60cm, the width of each planting hole is 40-60cm, the depth of each planting hole is 50-60cm, and each planting hole is filled with crushed clay or yellow soft soil 5-6kg at the bottom of the planting hole; the clay or the yellow cotton soil has the functions of absorbing water, preventing water leakage, ensuring water supply of nursery stocks, and simultaneously has the wind-proof function, and when wind sand is big, even if the sand on the upper part is blown away by strong wind, the clay part is not easy to blowAnd (4) walking. The large pit soil replacement improves the conditions of moisture and nutrients and improves the survival rate of afforestation.
S3: strong seedlings are deeply planted, 5-6 year old nutrition pot seedlings are selected as planted seedlings, the seedlings are strong, terminal buds are full, the height of the seedlings is larger than or equal to 60cm, the nutrition pots are removed during planting, nutrition soil keeps the original shape, then the seedlings are placed in planting pits, about 1/2 nutrition soil is buried in clay in the pits, the planting depth of the seedlings is 5-10cm higher than a root trace, and finally sand covering and treading are carried out; strong seedlings improve the physiological condition of the seedlings, and deep planting improves the water content of the soil in the root area, so that the combination of strong seedlings and deep planting obviously improves the afforestation preservation rate and the growth amount of the trees.
S4: watering and laminating, watering after planting, watering each plant 2-2.5kg, watering along with planting, laminating before the ground surface is not dry after planting and watering, wherein the length of the film is 60-70cm, the width of the film is 60-70cm, the mulching film is required to be tightly attached to the surface of a tree pit and is unfolded to be in a bottom shape, and after laminating, the nursery stock is positioned at the center of the film;
furthermore, the camphor tree pine introduction afforestation method also comprises mixed crossing and insect prevention, namely, the amorpha fruticosa and the camphor tree pine are mixed and crossed, and the amorpha fruticosa is planted in spring or autumn. The mixed afforestation can reduce the threat of forest plant diseases and insect pests, improve the growth amount of the nursery stocks, increase the thickness of withered and fallen objects and sand crusts and obviously improve the surface coverage.
Further, in the step S1, the belt pitch of the belt-shaped sand barriers is the same as the row pitch of the pinus sylvestris planting, the side length of the grids of the grid sand barriers is 1-2m, and the sand barriers are made of degradable PLA sand barriers, straws, wheat straws and chyme straws and are mixed with one or more straws.
Further, in step S3, the nutrition bowl seedlings should be introduced to a nursery of a lasza area for acclimatization when the seedling age is 3-4 years, and the acclimatization time is 2 years.
Furthermore, the big Huangmian soil ball with good water retention property and a nutrition pot specification of 30cm multiplied by 26cm is selected as the soil ball of the nutrition pot seedling.
Furthermore, 1-2-year-old seedlings are selected from the amorpha fruticosa planted seedlings, the ground diameter is larger than or equal to 0.3cm, the root system is complete, no plant diseases and insect pests exist, no water loss and no mildew phenomenon occur, the seedlings are cut by about 40cm during planting, then pits are dug and deeply planted, the planting depth is 30-35cm, the seedlings are exposed by 5-10cm, 2-3 plants are planted in each hole, the plant row spacing is 1m multiplied by 3m, the planting position is 30-35cm away from the lee of a sand barrier, and the seedlings are planted at the corners under the condition of grid barrier.
Furthermore, the sand barrier is composed of two rows of plants, the plants are buried into the planting holes in an inclined manner when being planted, the top ends of the two rows of plants are relatively close to each other, and the roots of the two rows of plants are far away from each other, so that the two rows of plants in the same area are nearly in an A shape, and the left row of sand barrier plants and the right row of sand barrier plants of the pinus sylvestris are in a V shape.
The invention has the beneficial effects that: for a long time, the Tibetan forest has a single tree species, mainly comprises willow and poplar, particularly has extremely low selectivity of evergreen tree species, and coniferous trees suitable for large-area afforestation in high-altitude areas of the Tibetan are rarely seen, so that the broad-leaved trees are lack of green and have extremely low oxygen content in the air after the leaves of the broad-leaved trees fall in winter. The introduction of the pinus sylvestris with extremely strong adaptability can adjust the stand structure of the forestation tree species in Tibet, increase the biodiversity and improve the fragile ecological environment of Tibet. According to the method, through the measures of building sand barriers, replacing soil in large pits, deep planting of strong seedlings, watering and film covering, mixed crossing and the like, the damage caused by wind erosion and sand burying is effectively reduced, the conditions of moisture and nutrients are improved, the survival rate and the preservation rate of the pinus sylvestris planted in the Tibet area are obviously improved, and the biological diversity is increased.
Drawings
FIG. 1 is a schematic illustration of a sand barrier according to a fourth embodiment of the present invention;
FIG. 2 is a schematic diagram of a sand dune formed in a sand barrier after wind blows in the fourth embodiment of the present invention;
wherein 1 is pinus sylvestris; 2 is a sand barrier material; and 3 is a sand dune.
Detailed Description
The present invention will be described in detail with reference to specific examples below:
example one
The camphor tree pine introduction afforestation method comprises the steps of building sand barriers, replacing soil in large pits, deep planting strong seedlings and watering and laminating films, and specifically comprises the following steps:
the planting time is spring, the temperature gradually rises after the soil is unfrozen in spring, the sap begins to flow, and the planting is carried out before the young shoots do not germinate.
S1: the sand barrier is erected before afforestation, the main wind direction of the test site is east wind, the trend of the sand barrier is perpendicular to the main wind direction, the sand barrier is erected into a latticed horizontal sand barrier due to the fact that the ground surface sand is high in mobility, the side length of the latticed horizontal sand barrier is 2m, the sand barrier is made of stumping sand punts, the sand barrier is erected, wind erosion sand burying hazards can be effectively relieved, and afforestation preservation rate and forest growth amount are improved.
S2: changing soil in large pits, planting in the planting field according to the planting density of 18 plants/667 m2Digging planting holes, wherein the length of each planting hole is 40cm, the width of each planting hole is 40cm, the depth of each planting hole is 50cm, and each planting hole is placed at the bottom of the corresponding planting hole by using 5kg of smashed clay; the clay has the functions of absorbing moisture, preventing moisture leakage and guaranteeing moisture supply of the nursery stocks, and has the windproof function, and when wind and sand are big, even if the sand on the upper part is blown away by strong wind, the clay part is not easy to blow away.
S3: and (3) strong seedlings are deeply planted, the nutrition pot seedlings are introduced to a nursery garden with good conditions in a Lasa area for domestication when the seedling age is 3 years, the domestication time is 2 years, the seedlings adapt to a high altitude climatic environment, and then the seedlings are introduced to forestation places such as Nikkai, Linzhi, Shannan and Lasa. The introduced pinus sylvestris is transported for a long distance and forestation is carried out in the soil with relatively poor water retention, such as a Tibet sand area, sandy loam and the like, and soil balls are fragile and lose water. During introduction, the big yellow cotton soil balls with good water retention and with the specification of a nutrition pot of 30cm multiplied by 26cm are selected as the soil balls of the seedlings of the nutrition pot so as to ensure the integrity of the root systems of introduced seedlings and the good water retention of soil. Selecting nutrition pot seedlings domesticated for 2 years and having the seedling age of more than 5 years, wherein the seedlings are strong, have plump terminal buds and have the height of more than 60cm, removing the nutrition bags during planting, keeping the original shape of the nutrition soil, then placing the seedlings in planting pits, burying about 1/2 of the nutrition soil in clay in the pits, and covering sand and treading down the seedlings, wherein the planting depth of the seedlings is 5cm higher than the root lines; strong seedlings improve the physiological condition of the seedlings, and deep planting improves the water content of the soil in the root area, so that the combination of strong seedlings and deep planting obviously improves the afforestation preservation rate and the growth amount of the trees.
S4: watering and laminating, watering after planting, watering 2kg of each plant, watering along with planting, laminating before the surface of the ground is not dry after planting and watering, wherein the size of the film is 60cm multiplied by 60cm, the mulching film is required to be tightly attached to the surface of a tree pit and is unfolded to be in a bottom shape, and the nursery stock is positioned in the center of the film after laminating;
and (3) taking nursery stock management and protection measures: fertilizing and irrigating according to the requirements of the pinus sylvestris on nutrients and moisture.
Example two
The camphor tree pine introduction afforestation method comprises the steps of building sand barriers, replacing soil in large pits, deep planting strong seedlings and watering and laminating films, and specifically comprises the following steps:
the planting time is spring, the temperature gradually rises after the soil is unfrozen in spring, the sap begins to flow, and the planting is carried out before the young shoots do not germinate.
S1: the sand barrier is erected before afforestation, the main wind direction of the test site is east wind, the trend of the sand barrier is perpendicular to the main wind direction, the sand barrier is erected into a latticed horizontal sand barrier due to the fact that the ground surface sand is high in mobility, the side length of the latticed horizontal sand barrier is 2m, the sand barrier is made of stumping sand punts, the sand barrier is erected, wind erosion sand burying hazards can be effectively relieved, and afforestation preservation rate and forest growth amount are improved.
S2: changing soil in large pits, planting in the introduction field according to the planting density of 20 plants/667 m2Digging planting holes, wherein the length of each planting hole is 50cm, the width of each planting hole is 50cm, the depth of each planting hole is 50cm, and each planting hole is placed at the bottom of the corresponding planting hole by using 5kg of smashed clay; the clay has the functions of absorbing moisture, preventing moisture leakage and guaranteeing moisture supply of the nursery stocks, and has the windproof function, and when wind and sand are big, even if the sand on the upper part is blown away by strong wind, the clay part is not easy to blow away.
S3: and (3) strong seedlings are deeply planted, the nutrition pot seedlings are introduced to a nursery garden with good conditions in a Lasa area for domestication when the seedling age is 3 years, the domestication time is 2 years, the seedlings adapt to a high altitude climatic environment, and then the seedlings are introduced to forestation places such as Nikkai, Linzhi, Shannan and Lasa. The introduced pinus sylvestris is transported for a long distance and forestation is carried out in the soil with relatively poor water retention, such as a Tibet sand area, sandy loam and the like, and soil balls are fragile and lose water. During introduction, the big yellow cotton soil balls with good water retention and with the specification of a nutrition pot of 30cm multiplied by 26cm are selected as the soil balls of the seedlings of the nutrition pot so as to ensure the integrity of the root systems of introduced seedlings and the good water retention of soil. Selecting nutrition pot seedlings domesticated for 2 years and having the seedling age of more than 5 years, wherein the seedlings are strong, have plump terminal buds and have the height of more than 60cm, removing the nutrition bags during planting, keeping the original shape of the nutrition soil, then placing the seedlings in planting pits, burying about 1/2 of the nutrition soil in clay in the pits, and covering sand and treading down the seedlings, wherein the planting depth of the seedlings is 5cm higher than the root lines; strong seedlings improve the physiological condition of the seedlings, and deep planting improves the water content of the soil in the root area, so that the combination of strong seedlings and deep planting obviously improves the afforestation preservation rate and the growth amount of the trees.
S4: watering and laminating, watering after planting, watering 2kg of each plant, watering along with planting, laminating before the surface of the ground is not dry after planting and watering, wherein the size of the film is 60cm multiplied by 60cm, the mulching film is required to be tightly attached to the surface of a tree pit and is unfolded to be in a bottom shape, and the nursery stock is positioned in the center of the film after laminating;
and (3) taking nursery stock management and protection measures: fertilizing and irrigating according to the requirements of the pinus sylvestris on nutrients and moisture.
EXAMPLE III
The camphor tree pine introduction afforestation method comprises the steps of building sand barriers, replacing soil in large pits, deep planting strong seedlings and watering and laminating films, and specifically comprises the following steps:
the planting time is spring, the temperature gradually rises after the soil is unfrozen in spring, the sap begins to flow, and the planting is carried out before the young shoots do not germinate.
S1: the sand barrier is erected before afforestation, the main wind direction of the test site is east wind, the trend of the sand barrier is perpendicular to the main wind direction, the sand barrier is erected into a latticed horizontal sand barrier due to the fact that the ground surface sand is high in mobility, the side length of the latticed horizontal sand barrier is 2m, the sand barrier is made of stumping sand punts, the sand barrier is erected, wind erosion sand burying hazards can be effectively relieved, and afforestation preservation rate and forest growth amount are improved.
S2: changing soil in the big pits, and planting in the introduction field according to the planting density of 22 plants/667 m2Digging planting holes, wherein the length of each planting hole is 60cm, the width of each planting hole is 60cm, the depth of each planting hole is 60cm, and each planting hole is placed at the bottom of the corresponding planting hole by using 6kg of smashed clay; the clay has the function of adsorbing waterThe water leakage is prevented, the water supply of the nursery stock is guaranteed, the wind-proof effect is achieved, and when wind sand is large, even if the sand on the upper portion is blown away by strong wind, the clay portion is not easily blown away.
S3: and (3) strong seedlings are deeply planted, the nutrition pot seedlings are introduced to a nursery garden with good conditions in a Lasa area for domestication when the seedling age is 3 years, the domestication time is 2 years, the seedlings adapt to a high altitude climatic environment, and then the seedlings are introduced to forestation places such as Nikkai, Linzhi, Shannan and Lasa. The introduced pinus sylvestris is transported for a long distance and forestation is carried out in the soil with relatively poor water retention, such as a Tibet sand area, sandy loam and the like, and soil balls are fragile and lose water. During introduction, the big yellow cotton soil balls with good water retention and with the specification of a nutrition pot of 30cm multiplied by 26cm are selected as the soil balls of the seedlings of the nutrition pot so as to ensure the integrity of the root systems of introduced seedlings and the good water retention of soil. Selecting nutrition pot seedlings domesticated for 2 years and having the seedling age of more than 5 years, wherein the seedlings are strong, have plump terminal buds and have the height of more than 80cm, removing the nutrition bags during planting, keeping the original shape of the nutrition soil, then placing the seedlings in planting pits, burying about 1/2 of the nutrition soil in clay in the pits, and covering sand and treading down the seedlings, wherein the planting depth of the seedlings is 5cm higher than the root lines; strong seedlings improve the physiological condition of the seedlings, and deep planting improves the water content of the soil in the root area, so that the combination of strong seedlings and deep planting obviously improves the afforestation preservation rate and the growth amount of the trees.
S4: watering and laminating, watering after planting, watering each plant by 2.5kg, watering along with planting, laminating before the surface of the ground is not dry after planting and watering, wherein the size of the film is 80cm multiplied by 80cm, the mulching film is required to be tightly attached to the surface of a tree pit and is unfolded to be in a bottom shape, and the nursery stock is positioned in the center of the film after laminating;
and (3) taking nursery stock management and protection measures: fertilizing and irrigating according to the requirements of the pinus sylvestris on nutrients and moisture.
Example four
The camphor tree pine introduction afforestation method comprises the steps of building sand barriers, replacing soil in large pits, deep planting strong seedlings and watering and laminating films, and specifically comprises the following steps:
the planting time is spring, the temperature gradually rises after the soil is unfrozen in spring, the sap begins to flow, and the planting is carried out before the young shoots do not germinate.
S1: building a sand barrier, building the sand barrier before afforestation, wherein the main wind direction of a test field is east wind, the trend of the sand barrier is vertical to the main wind direction, the sand barrier is built as a strip-shaped vertical sand barrier, the strip interval of the strip-shaped sand barrier is the same as the row interval of the pinus sylvestris 1, the sand barrier material 2 is sand willow, each strip sand barrier is composed of two rows of sand willows, the sand willows are obliquely buried in planting holes when planted, the top ends of the two rows of the sand willows are relatively close to each other, and the root parts of the two rows of the sand willows are far away from, so that the two rows of salix mongolica in the same belt are similar to the shape of the A, the left row of salix mongolica and the right row of salix mongolica in the pinus sylvestris are similar to the shape of the V, as shown in the attached figure 1, the salix mongolica positioned at the two sides of the pinus sylvestris 1 is in a shape that the upper end is inclined outwards, so that the function of water collection is achieved, rainwater can flow to the rhizosphere of the pinus sylvestris along the salix mongolica in rainfall, so as to increase the water content of the soil around the root system of the pinus sylvestris and improve the survival rate of afforestation and the growth amount of forest trees; in addition, because the two rows of salix mongolica in the same belt are nearly in an A shape, sand is not easy to blow to the periphery of the pinus sylvestris root system after wind blows, a sand dune 3 is accumulated between the two rows of salix mongolica, the pinus sylvestris is relatively low in terrain after the sand dune 3 is formed, and rainfall is easier to flow to the pinus sylvestris root during rainfall.
S2: changing soil in the big pits, and planting in the introduction field according to the planting density of 22 plants/667 m2Digging planting holes, wherein the length of each planting hole is 60cm, the width of each planting hole is 60cm, the depth of each planting hole is 60cm, and each planting hole is placed at the bottom of the corresponding planting hole by using 6kg of smashed clay; the clay has the functions of absorbing moisture, preventing moisture leakage and guaranteeing moisture supply of the nursery stocks, and has the windproof function, and when wind and sand are big, even if the sand on the upper part is blown away by strong wind, the clay part is not easy to blow away.
S3: and (3) strong seedlings are deeply planted, the nutrition pot seedlings are introduced to a nursery garden with good conditions in a Lasa area for domestication when the seedling age is 3 years, the domestication time is 2 years, the seedlings adapt to a high altitude climatic environment, and then the seedlings are introduced to forestation places such as Nikkai, Linzhi, Shannan and Lasa. The introduced pinus sylvestris is transported for a long distance and forestation is carried out in the soil with relatively poor water retention, such as a Tibet sand area, sandy loam and the like, and soil balls are fragile and lose water. During introduction, the big yellow cotton soil balls with good water retention and with the specification of a nutrition pot of 30cm multiplied by 26cm are selected as the soil balls of the seedlings of the nutrition pot so as to ensure the integrity of the root systems of introduced seedlings and the good water retention of soil. Selecting nutrition pot seedlings domesticated for 2 years and having the seedling age of more than 5 years, wherein the seedlings are strong, have plump terminal buds and have the height of more than 80cm, removing the nutrition bags during planting, keeping the original shape of the nutrition soil, then placing the seedlings in planting pits, burying about 1/2 of the nutrition soil in clay in the pits, and covering sand and treading down the seedlings, wherein the planting depth of the seedlings is 5cm higher than the root lines; strong seedlings improve the physiological condition of the seedlings, and deep planting improves the water content of the soil in the root area, so that the combination of strong seedlings and deep planting obviously improves the afforestation preservation rate and the growth amount of the trees.
S4: watering and laminating, watering after planting, watering each plant by 2.5kg, watering along with planting, laminating before the surface of the ground is not dry after planting and watering, wherein the size of the film is 80cm multiplied by 80cm, the mulching film is required to be tightly attached to the surface of a tree pit and is unfolded to be in a bottom shape, and the nursery stock is positioned in the center of the film after laminating;
s5: the mixed crossing insect prevention is carried out, the amorpha fruticosa and pinus sylvestris are mixed and crossed, the amorpha fruticosa is planted in spring and autumn, 2-year-old seedlings are selected for planting, the ground diameter is more than 0.3cm, the root system is complete, diseases and insect pests do not exist, the phenomena of water loss and mildew do not exist, the seedlings are cut by 40cm during planting, then pits are dug for deep planting, the planting depth is 30cm, the plants are exposed for 5cm, 2 plants are planted in each hole, the row spacing is 1m multiplied by 3m, the planting position is 30cm away from the lees of sand barriers, and the grids are planted at the corners in a shielding mode.
And (3) taking nursery stock management and protection measures: fertilizing and irrigating according to the requirements of the pinus sylvestris on nutrients and moisture.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. The method for introducing and afforesting the pinus sylvestris in the difficult territory of Tibet is characterized in that: the camphor tree pine introduction afforestation method comprises the steps of building sand barriers, replacing soil in large pits, deep planting strong seedlings and watering and film mulching for planting.
2. The method of claim 1, wherein the method comprises the steps of: the introduction and afforestation method of the pinus sylvestris comprises the following steps,
s1: building a sand barrier, wherein the planting time of the pinus sylvestris is spring or autumn, building the sand barrier before afforestation, the direction of the sand barrier is vertical to the main wind direction, the sand barrier is built into a vertical sand barrier or a horizontal sand barrier according to the terrain and the environment condition of the afforestation, and the vertical sand barrier or the horizontal sand barrier can be a strip-shaped sand barrier or a grid sand barrier;
s2: changing soil in large pits, planting in the planting field according to the planting density of 18-22 plants/667 m2Digging planting holes, wherein the length of each planting hole is 40-60cm, the width of each planting hole is 40-60cm, the depth of each planting hole is 50-60cm, and each planting hole is filled with crushed clay or yellow soft soil 5-6kg at the bottom of the planting hole;
s3: strong seedlings are deeply planted, 5-6 year old nutrition pot seedlings are selected as planted seedlings, the seedlings are strong, terminal buds are full, the height of the seedlings is larger than or equal to 60cm, the nutrition pots are removed during planting, nutrition soil keeps the original shape, then the seedlings are placed in planting pits, about 1/2 nutrition soil is buried in clay in the pits, the planting depth of the seedlings is 5-10cm higher than a root trace, and finally sand covering and treading are carried out;
s4: watering and covering a film, watering 2-2.5kg of each plant after planting, watering along with planting, covering a film before the surface of the ground is not dry after planting and watering, wherein the length of the film is 60-70cm, the width of the film is 60-70cm, the mulching film is tightly attached to the surface of a tree pit and is unfolded to form a bottom shape, and after covering the film, the nursery stock is positioned in the center of the film.
3. The method of claim 2, wherein the method comprises the steps of: the camphor tree pine introduction afforestation method also comprises mixed crossing and insect prevention, namely, the amorpha fruticosa and the camphor tree pine are mixed and crossed, and the amorpha fruticosa is planted in spring or autumn.
4. The method of claim 2, wherein the method comprises the steps of: in the step S1, the belt pitch of the belt-shaped sand barriers is the same as the row pitch of the pinus sylvestris planting, the side length of the grids of the grid sand barriers is 1-2m, and the sand barriers are made of degradable PLA sand barriers, straws, wheat straws and chyme straws and are mixed with one or more straws.
5. The method of claim 2, wherein the method comprises the steps of: in the step S3, the nutrition bowl seedlings are introduced to a nursery garden in a Lasa area for domestication when the seedling age is 3-4 years, and the domestication time is 2 years.
6. The method for the introduction and afforestation of pinus sylvestris in Tibet area according to claim 2, wherein: the big Huangmian soil ball with good water retention property and a nutrition pot specification of 30cm multiplied by 26cm is selected as the nutrition pot seedling soil ball.
7. The method of claim 4, wherein the method comprises the steps of: the planting seedlings of amorpha fruticosa are 1-2 year old seedlings, the ground diameter is larger than or equal to 0.3cm, the root system is complete, diseases and insect pests are avoided, water loss and mildew phenomena are avoided, the seedlings are cut by 40-45cm during planting, then pits are dug and deep planting is carried out, the planting depth is 30-35cm, the planting depth is 5-10cm, 2-3 plants are planted in each hole, the plant row spacing is 1m multiplied by 3m, the planting position is 30-35cm away from a sand barrier lee, and the planting position is shielded by grids and planted at the corners.
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