JP2003274760A - Method for planting tree in coast - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for preventing pinetree seedlings and other tree seedlings from withering by salt damage when pinetree seedlings and other tree seedlings are planted on a banking layer or a sandy beach layer of a coast. <P>SOLUTION: When trees are planted on a banking layer laid on a sandy beach of a coast, planting holes are dug at the planting parts of the banking layer, the bottom parts of the planting holes are connected to a sandy area by connection holes and the connection holes are provided with a lower desalination layer packed with a desalination material consisting essentially of a salt removing agent. When trees are planted on a sandy beach layer, the circumferences of the planting holes are provided with a peripheral desalination layer together with the lower desalination layer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an improvement in a planting method on a coast.

[0002]

2. Description of the Related Art Japan has a long coastline, and many coasts are rich in sandy beaches. And, as it has been traditionally called Shirasuna Aomatsu,
There are many sandy beaches covered with pine forests. These pine forests, especially black pine forests, are used to protect against blown sand, salt damage, and wind damage.
It plays an important role as a coastal protection forest with the purpose of attaching fish and sailing goals. However, recently, there are many pine wilts, exhaust gas from cars, and even pine withering due to acid rain, and pine forests are declining nationwide.

As a result, sand accumulates on the road due to quicksand or blown sand, causing a slip accident, and sand containing salt flies to a place far away from the coast, causing serious damage such as salt damage. ing.

[0004] Therefore, especially in a place where heavy sand or flying sand is severe or a facility such as a seaside park is established, sand is also held down by embankment. This embankment may break down nearby mountains and use the earth and sand, but in many cases, the earth remains after construction to serve as a dumping place for the remaining soil. The thickness of the embankment layer depends on the amount of earth and sand that can be used, etc.
Relatively many are about m to 1 m.

[0005]

By the way, it is possible to plant trees such as pine and flowering trees such as azaleas and cherry trees in such embankment areas from the viewpoints of preventing sea breeze and soil scattering and environmental greening. It is normal. It may also be planted on the beach itself to prevent salt breeze and flying sand.

However, according to the experience of the present inventors, even if pine trees and azaleas are planted on the sandy beach itself in the embankment, most of them die after one to two to three years. In most cases, the remaining trees are not healthy and show little growth.

In view of the above situation, the present inventors have conducted various studies on planting in the sandy beach layer and the embankment layer, and as a result, have speculated the following.

First, in the case of the embankment layer, conventionally, a planting hole is dug at a planting site, and the soil such as masa soil, upland soil or the excavated embankment itself is mixed with fertilizer and the like. I was just planting. However, although high quality soil such as masa soil is also used for the embankment, most of it is made of clay or gravel and mountain soil and construction soil, and because it is compacted with a bulldozer, it is poorly drained. Moreover, seawater permeates from the sandy layer below or at the edge of the beach, and salt in the seawater creates a hard impermeable layer below and around the planting hole. Therefore, rainwater and sprinkled water contain salt and accumulate at the bottom of the planting hole, causing the tree to rot and die. This salt root rot is the most common reason for dying within a year of planting.

Further, even if the roots manage to grow and the trees begin to grow, the bottom of the embankment layer is a sandy beach layer containing salt due to waves and infiltration, so when the roots of the tree reach the sandy beach layer, the growth will be caused by salt damage. It is blocked or withers. Therefore,
By all means, long-term training is not possible. And most of them die within 3 years. Even if the roots do not reach the sandy beach layer, sprinkling water or rainwater reaches the sandy beach layer, and this water vaporizes to absorb salt water, which causes salt damage.

On the other hand, although not extensively practiced, planting directly on a sandy beach layer has been conventionally practiced. In this case as well, planting holes are dug in the planting area, and a large amount of soil mixed with fertilizer is added to the soil such as masa soil and the planting is continued. However, in this case as well, most of the trees die with salt coming from the sandy layer.

[0011]

In order to prevent root rot in planting on the embankment, the present inventors have provided a connecting hole to the sandy beach layer below the planting hole, and connecting hole The soil was mixed with organic-inorganic soil conditioner. Soil for cultivation was put in the planting holes for planting. Here, the soil for cultivation is a soil such as masa soil or upland soil mixed with an organic or inorganic soil improving material. As the organic soil improving material, compost, cow dung, mulch, special organic fertilizer, etc. were used. Also,
Zeolite, perlite, and a diatomaceous earth processed product (trade name: Isolite CG, manufactured by Isolite Industry Co., Ltd.) were used as the inorganic soil conditioner.

As a result, I tried to plant pine trees in the third grade,
It did not die 1 year after planting. The roots of all of these pine trees grew long in the ground, indicating that root rot was effectively prevented. Also, since the momentum of the trees has not diminished much, it is considered that the effects of salt damage have been largely avoided. It is presumed that these are due to the action of the connecting holes and the zeolite filled therein.

In view of the above results, the present inventors have further researched and completed the present invention.
The main feature is to prevent salt damage in planting on the beach and further prevent root rot in the case of embankment.
The present invention will be described below.

First, in the case of vegetation on the embankment layer, a planting hole is dug in the planting site of the embankment layer, and the bottom of the planting hole and the sandy land are connected by a connecting hole. The planting hole (pot digging) is usually dug into a pot shape or a cylindrical shape by a heavy machine such as a Yumbo. The efficiency of the connecting holes can also be increased by machine digging. Note that the connecting hole may cut into the sand. The size of the planting hole depends on the size of the tree plant to be planted, but the depth is about 1/2 of the height of the plant (excluding the root) 40 to 70 cm
The diameter is preferably 40 to 70 cm in a flowerpot shape or a cylindrical shape, although the diameter depends on the size of the sapling.
As a tree seedling, in the case of San'in Kaigan, for example, in the case of a pine (Kuromatsu), it is about 1 to several years old, and the height is about 30 to 150 cm. Also, depending on the region, those which are strong against sea breeze and dry, such as azaleas and cherry blossoms of one to several years old, are preferably used. Of course, it is possible to transplant not only the seedlings but also the adult trees which have passed several decades. In this case, the size of the planting hole also becomes large, and it is necessary to increase the diameter or the number of the connecting holes.

Cultivation soil is put into these planting holes. The cultivated soil is a soil such as masa soil or upland soil mixed with fertilizer and organic / inorganic soil improving material. Zeolite, perlite, diatomaceous earth processed products (trade name: Isolite CG, diatomaceous earth fired grains, manufactured by Isolite Industrial Co., Ltd.) are used as inorganic soil conditioners, and compost, cow dung, leaf soil, special organic fertilizers, etc. are used as organic soil conditioners. To use. The mixing ratio of these is about 10 to 20% for both organic and inorganic with respect to the soil.

Next, the connecting hole will be described. The connection hole connects between the bottom of the planting hole and the sandy land, and the diameter or the size of one side is 5 to 50 cm for the seedling and the depth is about 20 to 100 cm. Then, the connection hole is filled with a mixture of an inorganic soil improving agent and an organic soil improving agent containing a salt removing agent as a main component or a desalination agent to which soil is further added to form a desalination layer. In addition, this desalination layer is referred to as a lower desalination layer in distinction from the desalination layer provided around the planting hole described later.

The lower desalination layer may be formed by filling the desalination material into a tubular or box-shaped container made of natural material such as a unglazed clay pipe, a paper pipe, a cardboard box, and a bamboo basket. By doing so, a uniform desalination layer can be formed with good working efficiency. As the container, a plastic film or a plastic sandbag can be used, but these are not preferable from the viewpoint of environmental protection.

The desalination material is a mixture of the inorganic soil improving material and the organic soil improving material described below. The inorganic soil conditioner is mainly composed of zeolite, to which isolite CG or perlite is appropriately mixed. Among them, zeolite is excellent in ion exchange capacity (cation exchange performance: CEC),
It adsorbs sodium ions satisfactorily and is the main force of salt removal agents. Also, inorganic organic soil conditioners such as Isolite CG and humus also have excellent base substitution ability, and are considered to be involved in sodium ion adsorption. The chlorine ions and hydrogen chloride remaining after the adsorption of sodium ions are adsorbed and removed by Isolite CG, fly ash, coffee grounds and the like. Therefore, it can be said that a mixed product of organic and inorganic soil improving materials containing these substances is an excellent desalination material. As the desalination material, these organic and inorganic soil improving materials may be mixed with an equal amount or less of soil such as masa soil and upland soil, if necessary.
Further, Isolite CG exhibits excellent effects on air permeability and water permeability, and perlite imparts bulk and aeration to soil.

In addition to removing salt, the inorganic soil conditioner also has a function of giving activity to plants and holding fertilizer in soil. Especially, when zeolite is mixed with masa soil, humus is likely to be accumulated to improve the physicochemical properties of the soil, and when mixed with sand, fertilizer retention capacity is increased and nitrogen content is increased.

As the organic soil improving material, compost, cow dung, mulch, special organic fertilizer, special organic liquid fertilizer, etc. are appropriately used.
Here, special organic fertilizer refers to a mixture of enzyme-fermented compost, organic blur fertilizer, and microbial culture soil, and refers to organic fertilizer rich in Chisso, phosphoric acid, and potassium, and special organic liquid fertilizer is potassium. , Calcium, trace amounts of copper, zinc, iron, manganese, etc., mixed with organic acids such as lactic acid and citric acid. The ratio of the inorganic soil improving material to the organic soil improving material is, for example, approximately equal.

The desalination layer may be provided not only on the inner circumference of the planting hole but also on the bottom. In this case, a large planting hole is dug, the desalination material is filled along the inner circumference of the hole, and the cultivation soil is filled from the inside. By filling the desalination material into a bag-shaped or sheet-shaped container made of paper, cloth, corrugated cardboard, etc. and laying it along the inner circumference of the cultivation soil, a uniform desalination layer can be worked efficiently. Can be formed. Also in this case, the material of the container is preferably a natural product. The desalination layer provided on the inner circumference is referred to as a surrounding desalination layer. The thickness of the surrounding desalination layer is 5 to
20 cm is enough.

With the above arrangement, first, by providing the connecting hole, rainwater and sprayed water do not collect in the planting hole but flow down to the sandy beach layer. Therefore, root rot does not occur.
In addition, even if salt (sodium chloride) is contained in rainwater, sprinkling water or cultivated soil, it is adsorbed by a salt remover such as zeolite and does not contain salt, that is, desalinated water is retained in the cultivated soil. It is also permeated into the sandy beach layer. Therefore, the hair roots in the cultivated soil part will survive without being hindered by salt content.

Further, the sandy beach layer originally contains seawater (salt water), but the freshwater that has flowed down has a low specific gravity, so that both do not mix, and a freshwater layer is formed here. Then, the roots of the trees gradually extend to reach the sandy beach layer, but since they grow along this freshwater layer and absorb freshwater, they are not damaged by salt. In addition, seawater becomes excellent drinking water rich in minerals and water for hydroponic culture, except for salt, and in the case of the present invention, plants absorb the minerals and show an excellent growth condition. In addition, once rooted and grown smoothly, the presence of some salt in the surroundings and the presence of a freshwater layer in other places allow the roots to grow smoothly. This is also evident in the natural pine forest on the beach. In short, most of the objectives can be achieved by controlling salt damage until they become active, and whether or not they have become active can be estimated in about one year or half a year.

In the present invention, the coast means the coastal part of the sea covered with sandy beaches. The location is not limited to the beach, but includes a location several hundred meters inward toward the inland area and several kilometers away. Infiltration of seawater is 100-200m from the beach
It is said that the effect of salt carried by the sea breeze is
It is said that it even reaches the mountain, and the range is quite large. The embankment layer is not limited to artificial ones,
It is also applicable to materials such as Masa soil and mountain soil naturally deposited on the sandy layer.

Next, the case of directly planting trees on the beach sand layer will be described. In this case, there is no such thing as the embankment layer that hinders the permeation of water. Conversely, rainwater or sprinkled water is absorbed by sand and causes a dry state (up to about 60 cm from the surface). In addition, the water content of sand beaches is high in salt, and most of the planted trees die due to salt damage within a year.

Therefore, in the present invention, prior to excavating a planting hole in the planting cylinder in the sandy beach layer and adding the cultivation soil, a desalination material is provided below the planting hole as in the case of the embankment layer. Is provided to provide a lower desalination layer to prevent salt damage. Further, in the case of sand beach layer planting, it is more necessary to provide the surrounding desalination layer in order to prevent salt permeation from the sand layer around the planting hole than in the case of the embankment layer. The dimensions of the planting holes, the cultivation soil and the desalination material are the same as those in the case of the embankment layer.

As a result of such vegetation, the salt (salt) contained in the sandy beach layer does not penetrate into the planting holes at the beginning of the vegetation, so that the planting well establishes and continues to grow. Further, rainwater and sprinkled water have a low specific gravity even if they flow down because they are fresh water, and they do not mix with a certain seawater layer in the sandy beach layer, and a freshwater layer is formed here. Then, the roots of the trees gradually extend to reach the sandy beach layer, but since they grow along this freshwater layer and absorb freshwater, they are not damaged by salt.

[0028]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 is a schematic cross-sectional view near the coast where the present invention is implemented. In the figure, the planted portion A is a sand dune (sand beach) area that has entered about 100 m from the edge of the beach, and the embankment layer 1 is provided here with a thickness of about 1 m.
The embankment layer 1 is made of masa soil and is located about 5 m from the sea surface. In the figure, reference numeral 2 is a sandy beach layer, and reference numeral 3 is a windbreak bamboo fence. Then, planting was also carried out in the cylinder place B on the sandy beach between the two rows of bamboo fences.

(Example 1) FIG. 2 shows an example of the present invention, in which a planting hole 4 having a diameter of 60 cm and a depth of about 60 cm is dug in the embankment layer 1 and further from the bottom thereof to a sandy beach. The connection hole 5 reaching the layer 2 is dug. The connection hole 5 has a diameter of about 20 cm and a depth of about 50 cm, and the desalination material 6 is filled therein to form the lower desalination layer 7. Next, the cultivation soil 8 is put into the planting hole 4, and the pine seedling 9 is planted. Reference numeral 91 indicates a headband of the root of the Matsunae 9, reference numeral 92 indicates an initial root, and reference numeral 93 indicates a trunk root that is extended later.

The desalination material 6 is composed of 40% (weight%, the same applies hereinafter) of inorganic soil improving material and 40% of organic soil improving material.
It is a mixture obtained by adding 0% of Masa soil. As an inorganic soil conditioner, a crushed zeolite product of about 2 to 5 mm 20
%, Diatomaceous earth granules (Isolite CG) of about 2 mm 10
%, Perlite 10%, and as an organic soil improving material, an appropriate amount of compost, cow dung, mulch, special organic fertilizer, special organic liquid fertilizer, etc. was used.

The cultivated soil 8 is made of masa soil as a guest soil, and is mixed with about 5% of an inorganic soil improving material and an organic soil improving material mixed product of about 5% mixed with zeolite and the like in equal amounts.

The pine seedlings 9 used were those newly planted in the embankment layer 1 rather than those newly picked up from the nursery. That is, a large number of pine seedlings are planted in this embankment layer 1, but most of them die after one to several years, and the remaining ones have poor leaf color and no momentum. 50 pine trees were planted in one plot, and there were 20 such plots, and the planting was supposed to proceed sequentially.
At present, it is in a state of being left alone in the middle.

The Matsunae 9 used in the experiment of the present invention is
It was planted with pine seedlings in the second grade in March, 1999.
It is one of the 40 which has managed to grow out of 100 in 2 plots as of the month and is divided into 20 each. Then, 20 pieces were left as they were (comparative example), and the remaining 20 pieces were replanted by the method shown in FIG. 2 (example). For those that were replanted, other than watering appropriately at the beginning,
Neither did any treatment. In addition, these 40
The leaves of all Matsunae in the book were about to turn yellow green.

Table 1 shows 10 of the 20 lines.
The results of measuring the height and width of the pine seedlings three times by selecting each book are shown. In terms of dimensions, there is almost no difference between the examples and the comparative examples. However, in comparison with the real ones, the branches and leaves of the example are thick and the color is dark green, but the branches of the comparative example are generally thin and yellow-green, and no occurrence occurs. Then, 7 out of 10 have died, and the remaining 3 have brown leaves, and are on the verge of death (as of January 2002).

[Table 1]

The initial planting method is as shown in FIG. 9, in which a planting hole 4 is dug in the embankment layer 1 and the masa soil mixed with about 15% of bark compost is put in as the soil for the soil 10. Matsunae 1
1 was planted. Reference numeral 111 is a headband of the root of Matsunae 11, reference numeral 112 is an initial root, and reference numeral 113 is a trunk root that has been extended later. Surprisingly, when this pine seedling 11 was dug up to carry out the present invention, a hard layer 12 was found below the planting hole 4. This layer 12 is formed by gathering and depositing seawater components. Originally, the pine root (trunk root) extends downward to the same length as the height of the tree, but in the case of the comparative example, the root growth is poor and the trunk root 113 is thin and the other roots mustache. There were only sparsely grown seeds that looked like roots (as of January 2002).

This is a natural result of following the usual inland planting method without considering the salt damage. For example, in the spring of 1999, we planted 50 7th grade Kuromatsu seedlings (height 1.5m) in a test plot in the embankment layer nearer to the coast than point B shown in Fig. 1, but in 1 year Most have died. Therefore, the trees were replanted in the spring of 2012, but most of them died in the same year, and the pine trees replanted again in the spring of 2013 are almost completely destroyed. In this way, replanting costs unnecessary costs. And the results are disastrous.

On the other hand, in the case of the present invention, as shown in FIG. 2, several trunk roots 93 extend straight downward with a length comparable to the tree height (as of January 2002). By the way, both No. When the root (trunk root) of No. 1 was dug to measure the length, in Example, what was 1.02 mm at the first time in Table 1 was 3.00 m at the third time.
It was m. On the other hand, the comparative example had a thickness of 1.1 mm at the first time point and did not have a length of 1.20 m at the third time point. Thus, although the tree heights and widths of both plants were growing similarly, there was a large difference in stem root growth. As a result, it is considered that many of the comparative examples die.

At present (as of January 2002, about 3 years have passed since the present invention was carried out), none of the examples of the present invention died, and the tree vigor was well established. It seems to be. It should be noted that once it has lived, it seems that it grows as it is like a natural pine tree unless there is much.

FIG. 3 shows a cardboard box 13 for filling the desalination material 6. When the desalination material 6 is filled in the cardboard box 13 and embedded in the connection hole 5, the lower desalination layer 7 can be easily formed.
Is obtained. This makes it possible to make the amount of the desalination material 6 per pine seedling uniform and to speed up the work. In this cardboard box 13, a small hole 13b is appropriately opened in an inner lid 13a on the lower side (upper side in the figure), Japanese paper 13c is put on the small hole 13b to close it, and the outer lid 13d is removed and buried at the time of construction. . The outer lid 13e and the inner lid on the upper side (lower side in the figure) of the cardboard box 13 are removed at the time of embedding.

FIG. 4 shows that, in the above example, a peripheral desalination layer 14 is further provided on the inner peripheral portion of the planting hole 4 or on the inner peripheral portion and the bottom portion. In this case, even if a large amount of salt is present in the embankment layer 1, it has an effect of preventing the salt from permeating into the cultivated soil 8. Although the thickness of the surrounding desalination layer 14 depends on the conditions of the planting site, a sufficient effect is exhibited when it is about 5 to 20 cm.

However, it is difficult to provide the desalination material 6 on the peripheral desalination layer 14, especially on the inner peripheral portion as it is. Therefore, in the present invention, as shown in FIG. 5, the tubular frame 15 is first set in the planting hole 4, the desalination material 6 is placed on the outer side thereof, and the cultivation soil 8 is placed on the inner side thereof, and then the tubular frame 15 is placed. I tried to pull it out. In this way, the desalination material 6 can be easily and surely filled. Alternatively, as shown in FIG. 6, a multiple partition bag 16 made of cotton is sewn, and the desalination material 6 is filled into this to form a mat-shaped desalination body 17, which is placed on the inner circumference of the planting hole 4. You may do it. By doing so, as in the case of the corrugated cardboard box 13, the amount of the desalination material 6 per pine seedling can be made uniform and the work can be speeded up.

The method of the present invention is not limited to the above-mentioned planting in the embankment layer, but can also be conducted in the sandy beach layer. Figure 7
An example of a case where planting is performed at the point B in FIG. 1 is shown. Also in this case, as in the case of planting in the embankment layer 1, by providing a lower desalination layer in which the connection holes 5 are filled with the desalination material 6, salt damage caused by water containing salt from the lower sand layer is prevented. Get out. In addition, since it is originally a sandy ground, there is no physical obstacle that the trunk root extends downward. FIG. 8 shows that the surrounding desalination layer 14 is further provided in the planting on the sandy beach layer 2. By doing so, it is possible to prevent the salt content from surrounding sand beach layers, and this form can be said to be an ideal form of planting in the sand beach layer 2.

[0043]

As described in detail above, in the planting method in the coastal zone of the present invention, when there is a bank of embankment, a connection hole reaching the sandy beach layer is formed below the planting hole, and salt is added here. An organic / inorganic soil conditioner containing a remover as a main component is filled.

Therefore, unlike the conventional case, water containing salt does not accumulate in the lower part of the planting hole, and death due to root rot can be effectively avoided. Further, conventionally, even if rooted, root growth and overgrowth were small after that, and it often died after several years, but in the present invention, it is surely rooted after 2-3 years and many pines can be formed on the male pines. It shows abundant growth.

In the case of planting by the conventional method, after 3 years, the pine needles have a yellowish tint even if they do not die, and the branches and leaves are thin and show malnutrition as a whole. On the other hand, in the present invention, after the rooting, the organic soil improving material in the cultivated soil or the desalination material feeds the pine seedlings with nutrients and is in a lively state.

The method of the present invention is less laborious than the conventional method because it simply forms a connecting hole under the planting hole, and the material to be filled is a processed product of zeolite or diatomaceous earth,

[Procedure amendment]

[Submission date] May 30, 2002 (2002.5.3)
0)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Added

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view near a coast where the present invention is implemented.

FIG. 2 is a cross-sectional view showing an example of a planting method of the present invention.

FIG. 3 is a perspective view of a cardboard box for filling the desalination material used in the present invention.

FIG. 4 is a sectional view showing another example of the present invention.

FIG. 5 is a perspective view showing an example of a method for filling an inner peripheral desalination material.

FIG. 6 is a perspective view of a mat-like desalination body filled with the desalination material used in the present invention.

FIG. 7 is a cross-sectional view showing an example of how the present invention is implemented in a sandy beach layer.

FIG. 8 is a cross-sectional view showing another example of a method for carrying out the present invention in a sandy beach layer.

FIG. 9 is a cross-sectional view showing a conventional way of planting.

[Explanation of symbols] 1 embankment layer 2 Sandy layer 3 Takegaki A Planting position (embankment layer) B Planting position (sand beach layer) 4 planting holes 5 connection holes 6 Desalination materials 7 Lower desalination layer 8 cultivation soil 9 Matsunae 91 headband 92 Original root 93 Trunk root that grew after 11 Matsunae 10 Soil 111 headband 112 the original root 113 Trunk roots extended after 12 solid layers 13 cardboard boxes 13a inner lid 13b small hole 13c Japanese paper 13d outer lid 13e outer lid 14 Surrounding desalination layer 15 Cylindrical frame 16 cotton multiple partition bags 17 Matte desalination

Claims (7)

[Claims] 1. When planting trees in an embankment layer laid on a sandy beach on the coast, a planting hole is dug at a planting site of the embankment layer and the bottom of the planting hole and the sandy land are connected. Connected by holes, the connecting holes are filled with a desalination material obtained by adding soil to the mixture of an inorganic substance and an organic substance containing a salt removing agent as a main component to form a lower desalination layer, and then a planting hole A method for planting trees on the coast, which comprises cultivating soil and planting trees. 2. When a tree is planted in a sandy beach layer on the coast, prior to digging a planting hole at the planting site and adding cultivation soil, the plant is in contact with the bottom of the planting hole to remove salt. Providing a lower desalination layer filled with a desalination material obtained by adding soil to the mixture of an inorganic substance and an organic substance having the agent as a main component, and planting a tree in the cultivated soil at the coast How to plant. 3. The method for planting trees on the coast according to claim 1 or 2, wherein a peripheral desalination layer is provided also on the inner peripheral portion or the inner peripheral portion and the bottom portion of the planting hole. 4. The lower desalination layer has a diameter or one side of 5 to 50.
The method for planting trees on the coast according to claim 1 or 2, wherein the length is 20 cm to 100 cm. 5. The lower desalination layer is formed by filling a desalination material in a container such as a unglazed clay pipe, a paper pipe, a cardboard box, a bamboo basket, or a wooden frame. Alternatively, the method for planting trees on the coast according to claim 4. 6. The peripheral desalination layer is formed by filling a desalination material in a bag-shaped or sheet-shaped container made of paper, cloth, corrugated cardboard, or the like. The method for planting trees on the coast according to claim 3. 7. The method of planting trees on the coast according to claim 3 or 6, wherein the surrounding desalination layer has a thickness of 5 to 20 cm.