JP2686134B2 - Subsea forest development base - Google Patents

Description

TECHNICAL FIELD The present invention relates to a foundation for submarine forest development. More specifically, the present invention relates to a submerged forest formation base for selectively growing larvae and scabbards (hereinafter collectively referred to as swordfish and swordfish).

(Prior Art) Brown seaweed Arame and Kajime are warm-sea kelp, large perennial seaweeds, and form undersea forests in coastal reef areas. In recent years, the importance of marine forests has been pointed out as a habitat for useful marine products such as abalone, turban shell, and sea urchin, and a place for feeding foods, from the standpoint of protecting marine resources and environmental conservation.

By the way, as a conventional structure for creating a seaweed bed, a natural stone crushed stone or a concrete block resembling a rock reef is generally used (Act No. 57-18531). A concrete block that resembles a reef generally has large and small irregularities to make it resemble a rock surface in order to promote the growth of zoospores (spores) and gametophyte of seaweed. In addition, artificial rock formation is generally targeted for aquaculture of kelp.

(Problems to be Solved by the Invention) However, since the zoospores of various types of seaweed float in the sea, only the target algae do not grow. For this reason, the original 1
For 2 years, the kelp that is the target of growth grows and grows,
Then replaced by perennial weeds that thrived in breeding,
After that, a situation arises in which they cannot enter again. That is, the effect as a kelp reef cannot be sustained. Therefore, it is not sufficient as a basis for continuously growing kelp for a long period of time.

In addition, the conventional kelp aquaculture base cannot grow and grow only specific algae. This is because the colonization of target algae constituting the underwater forest is hindered by the colonization of algae such as Aonori and Aosa, which are dominant species in the early stage of seaweed transition. For this reason, conventionally, there has not been a foundation for submarine forest development for selectively cultivating Arame and Kajime.

It is an object of the present invention to provide a submerged forest formation base capable of selectively growing only arame and kajime that compose the undersea forest.

(Means for Solving the Problem) In order to achieve such an object, the submarine forest creation base according to claim 1 of the present invention has a protrusion formed on a surface parallel to the sea surface of the base body laid on the seabed. Is provided with an overhang portion which is an inclined surface continuous with the surface and having an elevation angle of 120 degrees with respect to the surface.

Further, in the undersea forest formation base according to claim 2, the overhang portion intersects the ridge end surface parallel to the sea surface of the protrusion and the inclined surface.
It has a 60 degree ridge.

(Operation) Therefore, according to the undersea forest formation base of claim 1,
A vortex is swirled in the overhang part of the protrusion, and a large amount of zoospores grow. Then, this overhanging part becomes a shadow of the ridge, and the gametophyte of Ala meridian Kajime can grow, but it creates a light condition in which other seaweeds are difficult to grow and escapes the accumulation of mud.

That is, according to the undersea forest formation base of claim 1, since the inclined surface of the overhang portion is shaded with respect to the rays of light from the sea surface, it is darker than the surface of the base body and is suitable for the growth of sea bream and Kajime. Because of the amount of light, these settle as the dominant species. Further, since the mud does not accumulate on this inclined surface, it is possible to avoid the adverse effect of the mud at the initial growth stage such as the gametophyte generation of Alame and Kajime. On the other hand, in the early stage of seaweed transition, weeds that are not to be raised are planted as dominant species in the bright areas of the base surface and the top and top edges of the protrusions, or they do not grow due to sedimentation of mud or die.
Therefore, only Alame and Kajime are raised.

Further, according to the undersea forest formation base of claim 2, since the ridge of 60 degrees is formed at the uppermost part of the slope, the upper part of the slope becomes a dark place due to the shadow of the ridge and the lamellae are slightly dark.・ The light environment suitable for the growth of Kajime can be obtained.

(Examples) Hereinafter, the configuration of the present invention will be described in detail based on examples shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of a marine forest formation base of the present invention. This base is composed of a base body 1 made of concrete block or natural stone and a projection 2 formed on a top surface 3 thereof. The base body 1 has such a size and weight that it does not move by the flow of seawater, and has a height (thickness) such that at least the top end face 3 portion is not buried when laid on the seabed. The feature of the present invention lies in the fine surface shape of the base, not in the overall shape or material of the base. Therefore, the shape of the base body 1
The size and material are not particularly limited.

As shown in FIG. 2, the projection 2 has an overhang portion 5 formed by the inclined surface 4 in at least a part thereof. The overhang portion 5 has an elevation angle θ of about 120 ° with respect to a surface parallel to the sea surface, for example, the top end surface 3. The existence of this overhang part 5 causes
Protects Kagame's gametophyte 12. Therefore, the base body 1
Is laid so that the top surface 3 is substantially parallel to the sea surface.
Table 1 shows the relationship between the angle of overhang and the change in the dominant species of seaweed.
The change of the cumulative population of Kajime is shown. As is clear from Table 1 and FIG. 5, the elevation angle θ of the overhang portion 5 is
It can be seen that at 120 degrees, the most favorable environment is for the growth and growth of Ala kajime.

Alame and Kajime grow especially on the overhang portion 5 near the ridge 6 of the protrusion 2. Therefore, in order to efficiently form a large number of protrusions 2, the height is preferably about 10 cm or less. Further, the shape of the top end surface 7 of the projection 2 is not particularly limited, and may be a table shape as shown or a mountain shape. Although not shown, it is also possible to form the top end surface 7 to be a depression. Further, if the density of the projections 2 is too high, the passage of seawater will be poor, and the growth of the sea bream will not be good, and if it is too low, the density will be inefficient. . The projection 2 may have a horizontally long rod shape as shown in FIG. 1 or a pin shape.

With the above configuration,
Kajime is selectively raised.

The zoospores 10 of Arame, Kajime, and other seaweeds are carried by the flow of seawater to the top surface 3 of the submerged forest formation base, and a large amount of vortices are formed in the stagnant area 11 formed on the sides of the protrusions 2, causing a large amount of overshoot. It grows on the side wall surface 4 of the hang portion 5 [FIG. 3 (A)]. At this time, it is difficult for the zoospores 10 to grow on the top end surface 7 of the table-shaped projection 2. Side wall surface 4 of protrusion 2
Is an overhang, so it is a little dark behind the ridge 6 and is suitable for the growth of gametophyte 12. However, weeds such as Aonori and Aosa, which are dominant species in the early stage of seaweed transition
14 prefers a bright place, so settlement is prevented. For this reason, in the overhang portion 5, Alame and Kajime 13 immediately become the dominant species of seaweed. Moreover, since the sloped surface (side wall surface) 4 of the protrusion 2 is behind the overhanging ridge corner portion 6, the slack 13
At the early stage of growth such as gametophyte generation, the fear of adverse effects due to the accumulation of fine suspended matter (mud) on the surface of algal cells is eliminated. On the other hand, on the top surface 7 of the projection 2, which is a bright place, weeds 14 that grow faster than the larvae and Kajime are planted.
Under the influence of 15 deposits, the growth is suppressed or they die (Fig. 3 (C)). Furthermore, when a marine forest is formed by Arame and Kajime 13, the marine forest becomes dark, and weeds that prefer light are unable to grow. In addition, the roots develop so as to wrap around the ridge corner 6 in the process of the growth of algal bodies [Fig. 3 (D)]. Therefore, the fixing force in the adhesion period becomes strong, and the effect of preventing the alga bodies from being washed away due to strong waves can be obtained.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example,
As shown in FIG. 4 (A), it is sufficient that the inclined surface 4 of the protrusion 2 is formed at least in the vicinity of the overhang portion 5, and other portions may be vertical or trapezoidal or have other shapes. Further, as shown in FIG. 4 (C),
The base body 1 is not limited to the flat block as shown in FIG. 1 and may have a trapezoidal shape as shown.

(Effect of the invention) As is clear from the above description, the undersea forest creation base according to claim 1 of the present invention has a large number of protrusions having overhanging portions arranged on the surface of the undersea forest, so that the undersea forest creation is possible. It promotes zoospores and gametophyte growth of the target organism, Alame and Kajime, while preventing the infestation of weeds and eliminating concerns about the effect of sedimentation of sludge on initial growth. That is, it is possible to selectively grow only Arame and Kajime to form a marine forest in a short time. Moreover, since the root is rooted around the ridge corner of the overhang portion of the projection, the strong affixing force can prevent the algal cells from being washed away.

Therefore, according to the submarine forest creation base of the present invention, the zoospores and the adherence of the appressor are superior to the conventional one in which the top surface of the base is flat, and further, there is no overhang portion. Compared to the case where protrusions are arranged, it is superior in the formation rate of marine forests and the prevention of the influence of mud.

That is, according to the submerged forest development base of the present application, the inclined surface of the overhang portion is shaded against the rays of light from the sea surface, so that it is darker than the surface of the base body and is used for the growth of the lamella and swordfish to be grown. With the formation of a suitable environment,
Since the mud does not accumulate on the slopes, it is possible to avoid the adverse effects of the mud during the initial growth stage such as the gametophyte generation of Alame and Kajime. On the other hand, since the surface of the base body on which the overhang portion is formed is horizontal and the mud is easily deposited, it is possible to suppress the growth of weeds other than arame / kajime on the surface of the base body. As a result, it becomes possible to selectively grow only Arame and Kajime to form a marine forest in a short time.

Further, according to the undersea forest formation base of claim 2, since the ridge of 60 degrees is formed at the uppermost part of the slope, the upper part of the slope becomes a dark place due to the shadow of the ridge and the lamellae are slightly dark.・ It is possible to obtain a light environment in which Kajime can grow preferentially, and there is no effect of sedimentation. In addition, the accumulation of floating mud also occurs on the top surface of the protrusion, which hinders or kills the growth of weeds. As a result, in the overhang portion, Alame and Kajime immediately become the dominant species of seaweed, and growth of the target seaweed is not hindered by the floating mud deposit, and only the target seaweed can be propagated on the substrate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a marine forest formation base according to the present invention, and FIG. 2 is an enlarged vertical sectional view of a protruding portion of the base. FIGS. 3 (A), (B), (C) and (D) are schematic diagrams for explaining the settlement / growth and sticking force of lamellae / caullet. 4 (A) and 4 (B) are enlarged explanatory views of protrusions showing another embodiment of the present invention, and FIG. 4 (C) is a front view of a submerged forest formation base showing another embodiment of the present invention. , FIG. 5 is a graph showing the relationship between the angle θ of the protrusion with respect to the plane parallel to the sea surface and the cumulative population of the sea bream and the swallowtail. 1 ... Base body, 2 ... Protrusion, 3 ... Crown surface (surface parallel to the sea surface), 4 ... Side wall surface, 5 ... Overhang portion, 6 ... Ridge portion, 13 ... Lame / caullet.

Claims (2)

(57) [Claims] 1. An overhang comprising a projection formed on a surface parallel to the sea surface of a base body laid on the seabed, the projection being an inclined surface continuous from the surface and having an elevation angle of 120 degrees with respect to the surface. Submarine forest development base characterized by having a hang section. 2. The undersea forest formation base according to claim 1, wherein the overhang portion has a ridge angle portion of 60 degrees where a top end surface parallel to the sea surface of the protrusion and the inclined surface intersect.