JPH02255027A - Bed for preparing marine forest - Google Patents

Abstract

PURPOSE:To provide the subject bed used for selectively raising brown algae Eisenia and Ecklonia by disposing an overhung portion on each of projections formed on the upper surface of a bed main body set on a sea bottom. CONSTITUTION:An overhung portion 5 having an elevation angle theta of 90-180 deg. is formed on each of projections 2 disposed on the upper surface 3 of a bed main body 1 to provide the objective bed for making the marine forest, the bed main body being made of e.g. a concrete block, having such a size and a weight as not being moved by the sea water current and having such a thickness as the upper surface 3 is not buried when set on the sea bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a base for creating an underwater forest. More specifically, the present invention relates to a base for creating an underwater forest that selectively grows Aran and rivulets (hereinafter collectively referred to as arran and rivulets).

(Prior Art) The brown algae Arran and Arunidae are large perennial seaweeds that live in warm seas and form underwater forests in rocky reef areas along the coast. In recent years, the importance of marine forests has been pointed out from the standpoint of marine resource protection and environmental conservation as habitats and food sources for useful marine organisms such as abalone, turban shells, and sea urchins.

By the way, as conventional structures for creating seaweed beds, split natural stones and concrete blocks that resemble reefs are common (Utility Model Application No. 57-18531).6 Concrete blocks that resemble reefs are used for seaweed fishing and boat fishing. In order to encourage the settlement of zoospores (spores) and the growth of gametophytes, large and small irregularities are provided to resemble rock surfaces. The creation of artificial reefs is generally aimed at cultivating kelp species.

(Problems to be Solved by the Invention) However, since fumespores of various types of seaweed are floating in the sea, the target algae do not grow on them. For this reason, the initial 1~
For two years, the kelp species targeted for cultivation settle and grow, but after that they are replaced by perennial algae that reproduce vigorously, and a situation arises in which they are unable to re-enter. In other words, the effects of kelp reefs cannot be sustained. This lick is insufficient as a basis for continuously growing kelp over a long period of time.

Furthermore, conventional substrates for cultivating kelp cannot allow only specific algae to settle and grow. This is because the colonization of miscellaneous algae such as blue laver and sea lettuce, which are dominant species in the early stages of seaweed succession, prevents the colonization of the target algae that make up the underwater forest. Until now, there was no infrastructure for creating underwater forests that could selectively grow Ara 7 and Kashima.

An object of the present invention is to provide a base for creating an underwater forest that can selectively grow only the ara 7 and caulking that make up the underwater forest.

(Means for Solving the Problems) In order to achieve the above object, the base for creating an underwater forest of the present invention has a structure in which a protrusion is formed on the surface of the base body to be laid on the seabed, and an overhang part is provided on the protrusion. I have to.

And, the overhang part is 90° with respect to the plane parallel to the sea surface.
consisting of an inclined surface having an elevation angle greater than 1800°,
Preferably, it is formed with an inclined surface of about 120°.

Therefore, a vortex is formed in the overhang part of the protrusion, and a large amount of zoospores settle thereon. This overhang area provides shade at the ridge, allowing the gametophyte of the Arachnid to grow, while creating a light condition in which other potted plants grow and are protected from the accumulation of floating mud.

(Example) Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings.
111 will explain.

FIG. 1 shows a perspective view of an embodiment of a base for creating an underwater forest according to the present invention. This base consists of a base body 1 made of concrete slabs or natural stone, and a protrusion 2 formed on the top end face 3 of the base. The base body 1 has a size and weight that will not be moved by the flow of seawater, and a height (thickness) that will prevent at least the top surface 3 from being buried when it is laid on the seabed. The feature of this invention lies in the Rdish blue surface shape of the base, but not in the overall shape or material of the base. There are no particular limitations on the shape, size, material, etc. of the base body 1.

As shown in FIG. 2, the protrusion 2 has at least a portion of an overhang portion 5 formed by an inclined surface 4. This overhang portion 5 is parallel to the sea surface, so for example, the elevation angle θ is in the range of more than 90° and 180° with respect to the top surface 3, preferably more than 9° and less than 130°, and most preferably 120°. It has an elevation angle θ of around °. The existence of this overhang portion 5 protects the ara 7 and caulking gametophyte 12 from sedimentation of floating mud. Therefore, the base body 1
is laid so that the top surface 3 is approximately parallel to the sea surface.

Further, the protrusion 2 can be formed on a surface other than the top surface 3 of the base body I, and if the surface on which it is formed is not parallel to the sea surface, it may be formed on a curved surface or a surface as shown in FIG. 4(C), for example. Even in the case of a trapezoid or the like, the inclined surface 4 of the above-mentioned overhang portion 5 is formed so as to have an elevation angle θ greater than 90' and 180 degrees with respect to the sea surface or a plane parallel thereto. Table 1 shows the relationship between the overhang angle and changes in the dominant species of seaweed, and Figure 5 shows the relationship between the overhang angle and the change in the cumulative number of non-epiphytic Ara 7 and Kashima. 1st and 5th
As is clear from the figure, it can be understood that the more the elevation angle θ increases to a certain extent and the culm, that is, the overhang portion 5 becomes more conspicuous, the more favorable the environment is for the establishment and growth of Arame and Kajime.

The roughness 7 and caulking especially grow in the bar hang part 5 near the ridge corner part 6 of the protrusion 2. Therefore, in order to efficiently form a large number of protrusions 2, it is preferable to set the height to about 0 cm or less. Further, the shape of the top end surface 7 of the protrusion 2 is not particularly limited, and may be a table shape as shown in the figure, or may be a chevron shape. Furthermore, it is also possible to form the top end surface 7 of the force plate (not shown) into a depression.
If the arrangement density is too high, the passage of seawater will be poor, which is not good for the growth of Ara 7 and Kashima, and if the feeding density is too low, it will be inefficient, so they are arranged to have an appropriate density. . Further, the protrusion 2 may be in the shape of a horizontally long bar as shown in FIG. 1, or may be in the shape of a pin.

With the above configuration, Alain Kasime is selectively trained as follows.

The zoospores 10 of Aran's caulking and other seaweeds are carried to the top surface 3 of the underwater forest foundation by the flow of seawater, and are overflowed in large quantities by the eddies in the catchment area 11 formed on the side of the protrusion 2. It grows on the side wall surface 4 of the hang part 5 [
FIG. 3(A)]. At this time, zoospores 10 are difficult to adhere to the top surface 7 of the table-shaped projection 2. Since the side wall surface 4 of the protrusion 2 has an overhang, it becomes a slightly dark place in the shadow of the ridge 6, which is suitable for the growth of the gametophyte 12. The colonization of algae 14 is prevented because they prefer bright places.

Therefore, in the overhang portion 5, the Aran caulking 13 immediately becomes the dominant species of seaweed. Moreover, since the sloped surface (side wall surface) 4 of the protrusion 2 is in the shadow of the protruding ridge corner 6, fine suspended matter (fluid mud) is generated during the initial growth stage such as the gametophyte generation of Alain Kasime 13. Eliminates concerns about adverse effects caused by accumulation on the surface of algae. On the other hand, the protrusion 2 that becomes the bright spot
The top surface 7 of the algae is colonized by algae 14, or is affected by the accumulation of floating mud 15, and its growth is suppressed or it dies [
Figure 3 (C)]. Therefore, an underwater forest is formed in a short time by Aaran Kasime 13. Further, as the algal body continues to grow, roots develop to wrap around the ridge 6 [FIG. 3(D)]. Therefore, the adhesion force of the appressorium becomes stronger, and the effect of preventing the algae from being washed away by strong waves can be obtained.

It should be noted that, although the above-described embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited thereto, 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 surfaces 4 of the two protrusions 2 are formed at least near the overhang portion 5;
The other portions may be vertical, trapezoidal, or other shapes. Further, as shown in FIG. 4(B), the protrusion may be in the shape of a 1-shape, in which case the inclined surface 4 will have an elevation angle θ of approximately 1706° to 180° with respect to the sea surface. Furthermore, as shown in FIG. 4(C), the base body 1 is not limited to the flat block shown in FIG. 1, but may be trapezoidal as shown. And in this case protrusion 2
may be formed on a surface other than the large end surface 3, for example, on the slope 8.

(Effects of the Invention) As is clear from the above explanation, the base for creating a marine forest of the present invention has a large number of protrusions having overhangs on the surface of the base, so it is suitable for organisms targeted for creating a marine forest. While promoting the attachment of zoospores and the growth of gametophytes of Aranian cauliformes, it prevents the colonization of algae and eliminates concerns about the influence of floating mud accumulation on early growth. That is, by selectively cultivating only Aran cauliflower, an underwater forest can be formed in a short time. Furthermore, since the roots grow around the ridges of the overhanging parts of the protrusions, strong adhesion forces can prevent the algae from being washed away.

Therefore, the base for creating an underwater forest of the present invention has superior zoospore attachment and adhesion of appressoria compared to the conventional base where the top surface is flat, and furthermore, it does not have an overhang part. Compared to the case where protrusions are arranged, the formation rate of underwater forests and the prevention of the influence of floating mud are superior.

(Margin below)

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a base for creating an underwater forest according to the present invention, and FIG. 2 is an enlarged vertical cross-sectional view of a protruding portion of the base. Figure 3 (A), (B), (c) and (D) are Alan
FIG. 3 is a schematic diagram illustrating the settlement, growth, and fixation force of caulking. Figures 4A and 4B are enlarged explanatory views of protrusions showing another embodiment of the present invention, and Figure 4C is a front view of a base for creating an underwater forest 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 a plane parallel to the sea surface and the cumulative number of Aran caulking. ■... Base body, 2... Protrusion, 3... Top surface (parallel to the sea surface), 4... Side wall surface,
5... Overhang part, 6... Edge part, 13...
・Alan Kasime.

Claims (2)

[Claims] (1) Forming protrusions on the surface of the base body to be laid on the seabed,
A base for creating an underwater forest, characterized in that the protrusion has an overhang part. (2) The overhang part is
The foundation for creating an underwater forest according to claim 1, characterized in that it consists of an inclined surface having an elevation angle of more than 0° and less than 180°.