JP5388926B2 - Community formation method of submerged plant and vegetation base used for the same - Google Patents

Description

  The present invention relates to a method for forming a submerged plant community that forms a community of submerged plants such as Fusamo, Itomo, shrimp, etc. on the bottom of a closed water area such as a lake, and a structure of a vegetation base for growing a submerged plant used therefor About.

  Various subsidence plants such as Fusamo, Itomo, and Shrimp have various water purification effects such as nutrient absorption, suspension attachment, sedimentation, resuspension prevention, zooplankton such as daphnia and increase of attached microorganisms. It is known that there is. It is also known to have an ecosystem repair function such as an increase in small fish and benthic animals.

  However, due to the increase in nutrients during the period of high economic growth and water pollution caused by the addition of excess herbicides, the submerged plant communities have become extinct, disappeared, or declined in closed waters throughout the country.

  Therefore, from the viewpoint of improving water quality and protecting biodiversity, attempts are being made to regenerate submerged plant communities in such closed waters.

  For example, in Patent Document 1, a vegetation mat is accommodated in a floating island by accommodating a vegetation mat in a sheet member hung on a float, and a submerged plant is cultivated on the vegetation mat, and the vegetation platform is gradually added to the growth. The technology is described in which the vegetation base where the submerged plant finally grew is submerged to the bottom of the water and settled on the bottom of the water.

2007-259790

  However, in the technology of Patent Document 1, soil containing nutrients is applied to the surface of the vegetation mat in order to give the nutrients necessary for growing submerged plants until the vegetation base is fixed on the bottom of the water. When the vegetation base was thrown into the water or while it was installed in the water for a long period of time, there was a risk of soil flowing out from the vegetation mat into the water. When soil flows out from the vegetation mat into the water, the vegetation mat growing function is lowered and water pollution occurs. In addition, the surface of the vegetation mat coated with soil becomes mud, so that the algae and sprouts of the submerged plant are less likely to get caught and the submerged plant is less fixed on the vegetation mat.

  Furthermore, since the operation | work which smears the soil on the surface of a vegetation mat is performed by filling soil in the space | gap of a vegetation mat, there exists a problem that the filling operation takes time and manufacturing cost becomes high.

  An object of the present invention is to reduce a decrease in the growth function of a vegetation mat and water pollution caused by the vegetation-based soil being washed away into water.

  Another object of the present invention is to reduce the cost of regenerating a submerged plant community to the bottom of a closed water area.

  The submerged plant canopy formation method of the present invention is a submerged plant canopy formation method that forms a submerged plant community on the bottom of a closed water area such as a lake and marshes, wherein the water surface or light quantity of the closed water area can be secured. A vegetation base is installed, a submerged plant is pre-cultivated with a vegetation mat laid on a soil layer of the vegetation base, the vegetation mat on which the submerged plant has grown by pre-cultivation is removed from the vegetation base, and the removed vegetation mat Is submerged in the bottom of the closed water area, and the submerged plant is fixed on the bottom of the water.

  In the submerged plant canopy formation method of the present invention, the vegetation base has a structure in which a sucking prevention material such as a nonwoven fabric is arranged on a base mat held by a support net, and the soil layer is provided on the sucking prevention material. It is characterized by being.

  In the method for forming a submerged plant community according to the present invention, a new vegetation mat is laid on the soil layer of the vegetation base from which the vegetation mat is removed, and the pre-cultivation of the submerged plant and the closed water area using the vegetation mat are performed. It is characterized by repeatedly fixing to the bottom of water.

  The submerged plant community forming method of the present invention is a submerged plant community forming method that forms a submerged plant community on the bottom of a closed water area such as a lake, and is a water tank, a field, a water depth different from the closed water area. The vegetation mat, in which a soil layer is provided at the bottom of the pre-cultivation water area that can secure the amount of light in a shallow pond, etc., and the submerged plants are pre-cultivated with a vegetation mat laid on the soil layer, and the submerged plants have flourished by pre-cultivation Is taken out from the pre-cultivation water area, and the taken out vegetation mat is submerged in the bottom of the closed water area to fix the submerged plant on the bottom.

  In the method for forming a submerged plant community according to the present invention, a new vegetation mat is laid on the soil layer of the pre-cultivation water area from which the vegetation mat has been taken out, and the pre-cultivation of the submerged plant using the vegetation mat and the It is characterized by repeatedly fixing the closed water area to the bottom of the water.

  The submerged plant canopy formation method of the present invention is characterized in that the vegetation mat is formed of synthetic fibers such as polyethylene or vinyl chloride or natural fibers such as palm fibers, and is fixed to the soil layer with a pin member. To do.

  The vegetation base of the present invention is a submerged plant community forming method for forming a submerged plant community on the bottom of a closed water area such as a lake, and the vegetation base is installed in the water that can secure the water surface or the amount of light in the closed water area. And cultivating a submerged plant with a vegetation mat laid on the soil layer of the vegetation base, removing the vegetation mat on which the submerged plant has grown by pre-cultivation from the vegetation base, and removing the removed vegetation mat with the closing property The present invention is characterized by being used in a submerged plant community forming method characterized in that the submerged plant is submerged in the bottom of a water area and the submerged plant is fixed on the bottom of the water.

  In the vegetation base of the present invention, the vegetation base has a structure in which a suck-out preventing material such as a nonwoven fabric is disposed on a base mat held by a reinforcing net, and the soil layer is provided on the suck-out preventive material. It is used for the formation method of the submerged plant community characterized.

  In the vegetation base of the present invention, a new vegetation mat is laid on the soil layer of the vegetation base from which the vegetation mat has been removed, and the vegetation mat is used to pre-cultivate submerged plants and to the bottom of the closed water area. It is characterized by being used in a method for forming a submerged plant community characterized by repeated fixing.

  The vegetation base of the present invention is a submerged plant community forming method for forming a submerged plant community on the bottom of a closed water area such as a lake, and is a water tank, a field, a shallow pond, etc., separate from the closed water area. A soil layer is provided at the bottom of the pre-cultivation water area that can secure a sufficient amount of light, and the submerged plants are pre-cultivated with a vegetation mat laid on the soil layer, and the vegetation mat on which the submerged plants have proliferated is pre-cultivated. It is used in a method for forming a submerged plant community characterized in that the vegetation mat taken out from a cultivation water area is submerged in the bottom of the closed water area and the submerged plant is fixed on the bottom of the water.

  In the vegetation base of the present invention, a new vegetation mat is laid on the soil layer of the pre-cultivation water area from which the vegetation mat is taken out, and the pre-cultivation of submerged plants and the closed water area are performed using the vegetation mat. It is characterized by being used in a method for forming a submerged plant community characterized by repeatedly fixing to the bottom of the water.

  The vegetation base of the present invention is a submerged plant characterized in that the vegetation mat is formed of synthetic fibers such as polyethylene and vinyl chloride or natural fibers such as palm fibers and is fixed to the soil layer with a pin member. It is used for a community formation method.

  According to the present invention, since the vegetation mat is laid on the soil layer provided on the vegetation base, it is possible to prevent the soil on the vegetation base from flowing out into the water. Thereby, the fall of the growth function of the vegetation mat and water pollution which arise by the loss | flow of the soil to the water can be reduced. In addition, the vegetation base has a structure in which the soil layer is covered with the vegetation mat, and the surface of the vegetation mat does not become mud, making it easy to catch the algae and sprouting plants of submerged plants on the surface of the vegetation mat. , Can improve the fixity of submerged plants to vegetation mats. Furthermore, the vegetation mat was submerged by the submerged plant absorbing nutrients in the soil and growing and rooted, so that it was submerged in the bottom of the water. It can promote the expansion of plants.

  According to the present invention, since the vegetation mat is laid on the soil layer, the formation of the vegetation base can be facilitated. Moreover, since only the vegetation mat removed from the vegetation base is submerged in the bottom of the water, the vegetation base can be reused. Therefore, according to the present invention, it is possible to reduce the cost of regenerating a submerged plant community to the bottom of a closed water area.

  According to the present invention, a submerged plant is pre-cultivated with a vegetation mat laid on a soil layer provided at the bottom of a pre-cultivation water area, and thereby a vegetation mat on which a submerged plant has flourished is a target for regeneration of a submerged plant community. It is possible to reduce the cost of regenerating submerged plant communities to the bottom of the closed water area by facilitating pre-cultivation and installation of vegetation mats on the bottom of the closed water area. it can. Even in this case, the vegetation mat was submerged by the submerged plant absorbing nutrients in the soil and growing and rooted, so that it was submerged in the bottom of the water. The expansion of submerged plants in can be promoted.

It is explanatory drawing which shows the outline of the community formation method of the submerged plant which is one embodiment of this invention. It is explanatory drawing which shows the vegetation base | substrate shown in FIG. It is sectional drawing which shows the detail of the vegetation base | substrate shown in FIG. It is sectional drawing which shows the modification of the vegetation base | substrate shown in FIG. (A), (b) is explanatory drawing which shows the mode of the prior cultivation of the submerged plant by a vegetation base, respectively. It is explanatory drawing which shows the state which removed the vegetation mat in which the submerged plant flourished by prior cultivation from the vegetation base. It is a perspective view which shows the attachment structure of the weight to a vegetation mat. It is a perspective view which shows the modification of the attachment structure of the weight shown in FIG. It is explanatory drawing which shows the outline of the community formation method of the submerged plant which is other embodiment of this invention. (A)-(c) is explanatory drawing which shows the procedure of the prior cultivation of the submerged plant by the water tank shown in FIG. 9, respectively. It is explanatory drawing which shows the state which took out the vegetation mat in which the submerged plant overgrown by prior cultivation was taken out from the water tank.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The present invention relates to a submerged plant pre-cultivated using a vegetation mat in order to regenerate a submerged plant community in a closed water area where the submerged plant has disappeared due to water pollution or the like. By transplanting to the bottom of the water area and fixing and expanding it on the bottom, a submerged plant community is formed at the bottom of the water with high efficiency and low cost.

  FIG. 1 shows a case in which a community of submerged plants 12 is formed on the bottom of a closed water area 11 such as a lake. As a pre-cultivation method, a vegetation base 13 is installed in the water of the closed water area 11, and this vegetation is formed. The case where the submerged plant 12 is grown in the water of the closed water area 11 using the base 13 is shown.

  As shown in FIG. 2, the floating island 14 used in this method is formed by, for example, a float 14 a, and the vegetation base 13 is suspended on the floating island 14 by a suspension member (rope or the like) 15 so that the amount of light (sunlight) is sufficient. It is submerged in water of a predetermined depth that can be secured. In addition, the vegetation base 13 is not limited to the structure suspended from the floating island 14 by the suspension member 15, and may be configured to be suspended by a rope driven on a pile driven into the bottom of the water. In addition, depending on the type of the submerged plant 12, the vegetation base 13 may be placed on the water surface together with the floating island 14.

  As shown in FIG. 3, the vegetation base 13, which is an embodiment of the present invention used in this method, includes a support frame 21, a reinforcement member 22, a support net (reinforcement net) 23, a base mat 24, and a suction prevention material 25. The soil layer 26 and the vegetation mat 27.

  The support frame 21 is formed in an angle shape from steel, wood, FRP (fiber reinforced plastics) or the like, and is configured to have a strength that prevents the vegetation base 13 from being damaged when the vegetation base 13 is transported on land. . Moreover, the support frame 21 is set to a size of, for example, 1 m × 2 m or less so that a person can easily carry and install it.

  A support net 23 is attached to the support frame 21, and the bottom portion of the vegetation base 13 is formed by the support net 23. As the support net 23, for example, a support net 23 having a sufficient tensile strength necessary for transporting the vegetation base 13 on land is used. The size of the eyes of the support net 23 is set to such an extent that the soil does not sink between the meshes, for example, 25 mm or less.

  The support frame 21 is provided with a reinforcing member 22 for preventing the support net 23 from drooping downward. The reinforcing member 22 is formed in an angle shape or a plate shape from steel, wood, FRP (fiber reinforced plastics) or the like, and is disposed below the support net 23 or inside the vegetation base 13.

  A base mat 24 is laid on the support net 23. The base mat 24 facilitates the expansion of the submerged plant 12 on the lateral vegetation base 13 by allowing the rhizome of the submerged plant 12 to sufficiently develop below the thin soil layer 26. The load of the acting soil layer 26 is dispersed to stabilize the shape of the vegetation base 13 in a plane, and the roots of the submerged plant 12 are entangled with the base mat 24, thereby submerging the plant against the influence of fish and the like. It is installed for the purpose of making it difficult to pull out 12. As the base mat 24, a synthetic fiber mat formed of polyethylene, vinyl chloride or the like, or a natural fiber mat formed of palm fiber or the like is used. The base mat 24 has a thickness of about 10 mm to 30 mm. In the present embodiment, a thickness of 20 mm is used.

  On the base mat 24, a sucking prevention member 25 is laid in order to prevent the soil from flowing out from below the vegetation base 13. As the suck-out preventing member 25, a nonwoven fabric or a woven fabric made of polypropylene or the like is used.

  On the sucking prevention material 25, a soil layer 26 is provided by soil containing nutrient salts. As the soil, keto soil or dredged soil with high tackiness, dewatered treated soil, treated soil treated with a soil improvement material, black soil, etc. are used. The thickness of the soil layer 26 is set in the range of 5 mm to 20 mm in consideration of the weight during land transportation, the period of use in water, and the like. For example, when used for a long time in water, it is set to about 15 mm.

  A vegetation mat 27 is installed on the soil layer 26. As the vegetation mat 27, a synthetic fiber mat formed of polyethylene, vinyl chloride or the like, or a natural fiber mat formed of palm fiber or the like is used. The vegetation mat 27 has a thickness of about 5 mm to 20 mm. In order to make the root of the submerged plant 12 easily reach the soil layer 26, the thickness is about 10 mm in the present embodiment. Is set.

  In the case shown in FIG. 3, an angle-shaped support frame 21 is used. However, a plate-shaped support frame 21 may be used as shown in FIG.

  The submerged plant 12 is transplanted on the vegetation mat 27 of the vegetation base 13 configured as described above, as shown in FIG. The submerged plant 12 to be transplanted to the vegetation mat 27 is selected from those obtained by germinating buried seeds in the closed water area 11 that fixes the submerged plant 12, or submerged plants that grow naturally in the same watershed. The selected submerged plant 12 is fixed to the upper surface of the vegetation mat 27 using a U-shaped pin member 28 formed of a resin material such as polyethylene, a steel wire, or bamboo.

  When the submerged plant 12 is transplanted, the length of the suspension member 15 of the floating island 14 is adjusted, and the vegetation base 13 is submerged in water of a predetermined depth that can sufficiently secure the amount of light in the closed water area 11. As a result, the submerged plant 12 transplanted to the vegetation mat 27 receives sufficient sunlight, roots from a node or the like and settles on the vegetation mat 27, or the buds germinate and settle on the vegetation mat 27. The plant grows on the vegetation mat 27, develops the roots to the soil layer 26, and expands and grows on the vegetation base 13. Moreover, as shown in FIG.5 (b), the length of the suspension member 15 of the floating island 14 is adjusted with expansion and prosperity, and the vegetation base 13 is moved deeply in water. Thus, the submerged plant 12 is pre-cultivated in the water of the closed water area 11 over several weeks to several months using the vegetation mat 27 of the vegetation base 13.

  When the submerged plant 12 grows on the vegetation mat 27 by pre-cultivation, the vegetation mat 27 on which the submerged plant 12 has grown is removed from the vegetation base 13, and the removed vegetation mat 27 is submerged in the bottom of the closed water area 11. . At this time, the vegetation mat 27 removed from the vegetation base 13 may be cut and divided as necessary. The division shape is set to, for example, a width of 30 cm to 1 m in consideration of workability when installed on the bottom of the water, expansion of a submerged plant after installation on the bottom of the water, and the like.

  As shown in FIG. 7, weights 31 are attached to both sides of the vegetation mat 27 in order to quickly sink the vegetation mat 27 to the bottom of the water. In the case illustrated in FIG. 7, a rod-shaped reinforcing bar is used as the weight 31, but the present invention is not limited thereto, and a stone or the like may be used as illustrated in FIG. 8. Further, the weight 31 is not limited to the both side portions of the vegetation mat 27, and may be mounted inside the vegetation mat 27 according to the size and shape of the vegetation mat 27.

  In this way, by submerging the vegetation mat 27 in which the submerged plant 12 is prosperous on the bottom of the closed water area 11 and fixing and expanding it, a community of the submerged plant 12 can be formed on the bottom of the closed water area 11. .

  Further, a new vegetation mat 27 is installed on the soil layer 26 of the vegetation base 13 from which the vegetation mat 27 has been removed, and the submerged plant 12 is pre-cultivated using the vegetation mat 27 in the same manner as described above. . And the vegetation mat 27 in which the submerged plant 12 flourished by prior cultivation is submerged in the bottom of the water. In this way, the pre-cultivation of the submerged plant 12 and the fixing to the bottom of the water are repeatedly performed using one vegetation base 13.

  As described above, in the configuration of the present invention, since the vegetation mat 27 is laid on the soil layer 26 provided on the vegetation base 13, the soil layer 26 of the vegetation base 13 flows out into the water by the vegetation mat 27. Is prevented. Thereby, the fall of the growth function of the vegetation mat 27 and water pollution which arise by the loss | flow of the soil to the water are reduced. Further, the vegetation base 13 has a structure in which the soil layer 26 is covered with the vegetation mat 27, and the surface of the vegetation mat 27 does not become muddy. It becomes easy to get caught on the surface, and the fixability of the submerged plant 12 to the vegetation mat 27 is enhanced. Furthermore, since the vegetation mat 27 is submerged in the bottom of the submerged plant 12 in a state where the submerged plant 12 has grown, root damage is reduced in the initial stage of transfer to the bottom of the water, and the expansion of the submerged plant 12 on the bottom of the water is promoted. Is done.

  In the configuration of the present invention described above, since the vegetation mat 27 is laid on the soil layer 26, an operation of filling the vegetation mat 27 with soil is unnecessary, and the vegetation base 13 can be easily formed. can do. Moreover, since only the vegetation mat 27 removed from the vegetation base 13 is submerged in the water bottom, the vegetation base 13 can be reused. Therefore, the cost of regenerating the community of the submerged plant 12 to the bottom of the closed water area 11 is reduced.

  FIG. 9 is an explanatory diagram showing an outline of a submerged plant community formation method according to another embodiment of the present invention.

  In the case shown in FIG. 1, as a pre-cultivation method, the submerged plant 12 is grown in the water of the closed water area 11 using the vegetation base 13 installed in the water of the closed water area 11. On the other hand, in the method shown in FIG. 9, the submerged plant 12 is preliminarily used in a pre-cultivation water area in which the amount of light (sunlight) can be secured, which is different from the closed water area 11 that is a formation target of the submerged plant 12. I try to grow it.

  FIG. 9 shows a case where a water tank 41 is used as the pre-cultivation water area. The pre-cultivation water area is not limited to the water tank 41, and may be a farm field, a shallow pond, or the like.

  As shown in FIG. 10 (a), the bottom of the water tank 41 is provided with a soil layer 42 by introducing bottom mud of the bottom of the closed water area 11 that is a target for forming a community of the submerged plants 12. . The thickness of the soil layer 42 is 1 cm to 5 cm.

  In addition, when using a farm, a shallow pond, etc. as a water area for pre-cultivation, the bottom mud can be used as the soil layer 42. In addition to bottom mud, horticultural soils rich in nutrition may be used as the soil layer.

  As shown in FIG. 10B, a vegetation mat 43 similar to that used for the vegetation base 13 in FIG. 3 is laid on the soil layer 42. The vegetation mat 43 is pressed onto the soil layer 42 by a weight such as a reinforcing bar (not shown) or a weight such as a stone so as not to be buried in the soil layer 42.

  In this case, the thickness of the vegetation mat 43 may be set to about 5 mm to 40 mm in consideration of transportation, mud thickness, and the like. If the thickness of the vegetation mat 43 is 40 mm or more, the thickness of the soil layer 42 to be introduced into the aquarium 41 is increased, increasing the labor of the work, and the roots of the submerged plant 12 are difficult to reach the soil layer 42 and become rooted. This is not desirable because it takes time.

  The submerged plant 12 is fixed to the vegetation mat 43 with the same configuration as shown in FIG. In addition, when using the water tank 41, since the vegetation mat 43 is stabilized compared with the case where the vegetation base 13 is installed in the water of the closed water area 11, it replaces with the method using the pin member 28, and the submerged plant 12 is made into a stone. It is good also as a structure pressed against the vegetation mat 43 using weights, such as.

  Thus, the submerged plant 12 is pre-cultivated in the aquarium 41 over several weeks to several months using the vegetation mat 43 installed on the soil layer 42 of the aquarium 41.

  As shown in FIG. 10 (c), when the submerged plant 12 is prospered on the vegetation mat 43 by pre-cultivation, the vegetation mat 43 in which the submerged plant 12 has proliferated from the aquarium 41 is formed as shown in FIG. The removed vegetation mat 43 is submerged in the bottom of the closed water area 11 in the same manner as shown in FIG.

  Further, a new vegetation mat 43 is installed on the soil layer 42 of the water tank 41 from which the vegetation mat 43 has been taken out, and the submerged plant 12 is preliminarily used by using the vegetation mat 43 installed in the water tank 41 as described above. Cultivation is performed. And the vegetation mat 43 in which the submerged plant 12 flourished by prior cultivation is submerged in the water bottom. As described above, the pre-cultivation of the submerged plant 12 and the fixing to the water bottom are repeatedly performed using one water tank 41.

  As described above, according to the present invention, the submerged plant 12 is pre-cultivated with the vegetation mat 43 laid on the soil layer 42 provided at the bottom of the water tank 41, and the vegetation mat 43 on which the submerged plant 12 prospered is closed. Since it was made to sink to the bottom of the basin 11, pre-cultivation and installation work of the vegetation mat 43 on the bottom of the water are facilitated, and the cost of regenerating the community of the submerged plant 12 to the bottom of the closed basin 11 is reduced. Can do. Even in this case, the vegetation mat 43 is submerged in the bottom of the submerged plant 12 so that the submerged plant 12 grows deeply. Expansion can be promoted.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 11 Closed water area 12 Submerged plant 13 Vegetation base 14 Floating island 14a Float 15 Suspension member 21 Support frame 22 Reinforcement member 23 Support net 24 Base mat 25 Suction prevention material 26 Soil layer 27 Vegetation mat 28 Pin member 31 Weight 41 Water tank (Pre-cultivation) Water area)
42 Soil Layer 43 Vegetation Mat

Claims (7)

A submergence plant formation method for forming a submergence plant community on the bottom of a closed water such as a lake,
Installing a vegetation base in the water that can secure the water surface or light quantity of the closed water area,
Pre-cultivate submerged plants with a vegetation mat laid on the soil layer of the vegetation base,
Remove the vegetation mat on which submerged plants have prospered by pre-cultivation from the vegetation base,
A method of forming a submerged plant community, wherein the removed vegetation mat is submerged in a bottom of the closed water area and the submerged plant is fixed on the bottom of the water.   2. The method for forming a submerged plant community according to claim 1, wherein the vegetation base is provided with a sucking prevention material such as a nonwoven fabric on a base mat held by a support net, and the soil layer is provided on the sucking prevention material. A method for forming a submerged plant community, characterized in that   The method for forming a submerged plant community according to claim 1 or 2, wherein a new vegetation mat is laid on the soil layer of the vegetation base from which the vegetation mat has been removed, and the submerged plant is pre-cultivated using the vegetation mat. A method for forming a submerged plant community, comprising repeatedly fixing the closed water area to the bottom of the water. A submergence plant formation method for forming a submergence plant community on the bottom of a closed water such as a lake,
Provide a soil layer on the bottom of the pre-cultivation water area that can secure the amount of light such as a water tank different from the closed water area, farm field, shallow pond, etc.,
Pre-cultivate submerged plants with a vegetation mat laid on the soil layer,
Taking out the vegetation mat on which submerged plants have prospered by pre-cultivation from the pre-cultivation water area,
A method for forming a submerged plant community, wherein the vegetation mat taken out is submerged in a bottom of the closed water area and the submerged plant is fixed on the bottom of the water.   5. A method for forming a submerged plant community according to claim 4, wherein a new vegetation mat is laid on the soil layer of the pre-cultivation water area from which the vegetation mat has been taken out, and the submerged plant is pre-cultivated using the vegetation mat. And a method of forming a submerged plant community characterized by repeatedly fixing the closed water area to the bottom of the water.   The submerged plant community formation method according to any one of claims 1 to 5, wherein the vegetation mat is formed of synthetic fibers such as polyethylene or vinyl chloride or natural fibers such as palm fibers, and is pinned on the soil layer. A method for forming a community of a submerged plant, characterized by being fixed by a member.   A vegetation base for a submerged plant, which is used in the method for forming a submerged plant community according to any one of claims 1 to 3.

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