JPH0740839B2 - Method for constructing eelgrass field and seeding substrate used for the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for artificially constructing a eelgrass field in a relatively shallow sea and a seeding substrate suitable for forming a growth base by the method.

[0002]

2. Description of the Related Art Seaweed beds, which consist of, for example, eelgrass, which grows in coastal waters in shallow water, are ideal for growing adult fish as well as juvenile fish. An attempt has been made to do so.
In one of them, for example, a bag body is formed from a cloth having a mesh of ¹ to 4 mm ² called a mesh using a synthetic resin thread,
This fabric bag is filled with eelgrass seeds and laid down on the bottom of the water, and means for growing eelgrass are known.According to such means, for example, when seeds of eelgrass are directly sown from the ship, It is suitable for the creation of an eelgrass field, because there is no risk of uncertain curing due to the flow of eelgrass seeds in the tidal current.

[0003]

However, because the mesh of the fabric bag is small, it is difficult for the seeds of eelgrass to germinate, and even if the seeds germinate, the nets do not corrode and the growth and rooting properties are deteriorated. However, it cannot be said that it is suitable for creating an eelgrass field. Alternatively, if the material of the cloth bag is made of corrosive fiber, it will be suitable for the germination of seeds due to the corrosion of the fiber, but the fiber will be corroded and the cloth bag will be broken by the time the eelgrass is sufficiently grown and propagated. , There was a problem that germination and developing eelgrass were also washed away. The present invention has been made in view of such actual circumstances, and not only effective prevention of the loss of eelgrass seeds,
It is an object of the present invention to provide a method for constructing an eelgrass field that allows good germination and growth of seeds, and to provide a suitable seeding substrate for use in the method.

[0004]

[Summary of the first invention has been made regarding the reclamation method of eelgrass beds, premature corrosive fibers and flame corrosive or non-corrosive fiber net-like, which are interwoven with < The fabric's eyes after the fabric has corroded the premature corrosive fibers.
So that the mating is more than twice the mesh of the cloth before corrosion,
Forming the bag body, the bag body by filling the growing base material comprising seeds of eelgrass form a sowing substrate, further, the seeded substrate
It is characterized by laying sediment on the bottom of the water. The second invention has been made about the seeding substrate used in Construction of eelgrass beds, the union nets shaped fabric in early corrosion of the fiber and the flame-corrosive or non-corrosive fiber, early corrosive fibers The texture of the cloth after corrosion is the texture of the cloth before corrosion
As it is twice or more, characterized in that to form the bag body, formed by filling the growing base material to the bag containing the seeds of eelgrass
I am trying.

[0005]

According to the method of the first aspect of the present invention, the bag body made of cloth prevents the growth base material containing eelgrass seeds from being washed away, and the early corrosive fibers corrode over time, thereby germinating the seeds. And the development is good. In addition, after the corrosion of premature corrosive fiber, the net-like bag body made of non-corrosive or non-corrosive fiber remains, so that not only the growth base material is washed away, but also germination and the loss of eelgrass in the developing stage are effective. The basic function of eelgrass field growth is reliably maintained. Then, if the net-shaped bag body is a fiber that is difficult to corrode, it will corrode soon, but by the time the eelgrass is fully rooted and propagates and the roots and stems hold the growth base material, the growth base material and The loss of eelgrass is prevented. According to the second aspect of the invention, a suitable seeding substrate can be obtained by using the method for creating an eelgrass field described above.

[0006]

EXAMPLE A method for constructing an eelgrass field according to the first invention will be described below. First, as to the seeding base 1 used in this method, as shown in FIG. 1, the seeding base 1 is prepared by filling a bag 3 made of cloth with a growth base material 2 in which seeds of eelgrass and fertilizer are mixed with sand and mud. In the bag body 3 made of fabric, the ratio of pre-corrosive fiber (cotton thread is selected) a and non-corrosive fiber (polyamide fiber is selected) b is 2 to 1 in length and width. Growth base material 2 to be woven and filled in
A fabric 4 having a mesh size of ¹ to 4 mm ² that does not spill out is used.
The periphery is sewn so as to form the injection part 5 of the growth base material 2, and the upper and lower fabrics 4 are partially connected so that the thickness of the growth base material 2 in the filled state is about 5 cm. The bag body 3 is formed in a size of about 1 m × 1 m. When constructing an eelgrass farm, 5 g of eelgrass seeds and 100 g of resin-coated fertilizer were mixed with water to sand mud having an average particle size of 0.1 to 3 mm to be filled in the fabric bag body 3. Then, a slurry-like growth base material 2 is prepared, and the growth base material 2 is filled in a bag 3 with a squeeze pump to form a seeding base 1, which is the germination time of eelgrass seeds.
It was loaded in the middle of November, and it was settled on the bottom of the water in the planned sea area (average water level plus 0.6m to 2m) for the creation of the eelgrass ground, and it was used as an artificial growth base for eelgrass.

In such a method for constructing an eelgrass yard, the precipitating corrosive fiber a corrodes about one month after the seeding substrate 1 is settled down, and during this period, not only the growth base material 2 is washed away, but also the eelgrass seeds are washed away. 2 is not seen, and as shown in FIG. 2, the early corrosive fiber a corrodes and only the net-shaped bag body 3b made of the hardly corrosive fiber b remains, so that the germinated eelgrass sprouts are in good condition. It grew to, grew the grape stems and propagated. Then, the net-shaped bag 3b made of the non-corrosive fiber b whose mesh is 9 times as large as that before the corrosion due to the corrosion of the early-corrosive fiber a remains, so that the net-shaped bag 3b becomes the growth base material 2 Satisfactorily maintained, and the roots and vines of the eelgrass that also grew together were kept so as to cover the growth base material 2, and the growth base material 2 and the eelgrass were hardly washed away. Therefore, an eelgrass field as a facility for growing marine products was successfully constructed in the settling area of the seed substrate 1.

Examples of the early corrosive fiber a used in the above examples are natural fibers such as cotton and hemp, which have poor environmental resistance to early corrosion including brittleness, and cellulosic regenerated fibers such as rayon and acetate. Is suitable. Examples of the non-corrosive fiber b include natural fibers such as wool and palm shell fiber, which are particularly excellent in corrosion resistance, and other polynosic rayon and viscose rayon for tire cord, and also polyester, polyamide, polyethylene, vinyl chloride, etc., and starch. Artificial fiber made by mixing calcium carbonate and calcium carbonate, or man-made made of biodegradable plastics (for example, tone made by AMKO in the United States, pullulan made by Hayashibara Co., Ltd., Soar Fill made by Mitsubishi Rayon Co., Ltd.) Fibers, and even corrosive fibers which have been subjected to antiseptic treatment, are preferably used.

As the antiseptic treatment for the above corrosive fiber, an antiseptic treatment for surface water repellent with a water repellent or an adhesive, or an antiseptic treatment in which the corrosive fiber is applied or dipped in an antibacterial agent or an antiseptic agent is carried out. It is possible. As the water repellent, when the subject of the water repellent treatment is a cellulosic fiber, for example, Asahi Guard AG-310 or AG manufactured by Asahi Glass Co., Ltd.
A 5-7% solution of -433 is suitable, and in the case of other chemical fibers, for example, a 3-5% solution of Asahi Guard AG-710 or AG-730 manufactured by Asahi Glass Co., Ltd. is suitable. Depending on the object to be treated, other silicone-based, fluorine-based, wax-based water repellents and the like can also be suitably implemented. As the adhesive, for example, Polysol A-403-2 or AT-130 manufactured by Showa Polymer Co., Ltd., or other A
P-6710 and the like can be used by diluting it 2-3 times, and as antibacterial agents, Benrate manufactured by DuPont, Topzin M manufactured by Nippon Tanka Co., Ltd., and Xylamon EX manufactured by Takeda Pharmaceutical Co., Ltd. It can be preferably used.

Fibers made of mixed fiber rayon, in which at least one of a high molecular emulsion and a water-soluble polymer is internally added to a viscose solution, as the hardly corrosive fiber b, that is, regenerated by decomposition and corrosion by microorganisms A viscose solution composed of cellulose, a high molecular emulsion (for example, vinyl acetate resin, acrylic resin, ethylene vinyl acetate resin, etc.) that is not decomposed and corroded by microorganisms and can compensate the strength decrease due to decomposition and corrosion of rayon, and a water-soluble polymer A fiber obtained by internally adding one of (for example, polyvinyl alcohol, polyacrylic amide, etc.) at a rate of 2 to 15% at the stage of the viscose solution can also be suitably used, and in any case, as the noncorrosive fiber b. Seed substrate 1
It is preferable to maintain the shape of the seeding substrate 1 for at least about 6 months to 1 year after the sedimentation is laid on the water bottom.

Instead of the above-mentioned various types of hardly corrosive fibers b,
It goes without saying that this can be implemented as a non-corrosive fiber. As the non-corrosive fibers, for example, vinylon type such as polyvinyl alcohol, polyester type such as polyester, polyamide type such as nylon,
Alternatively, it is possible to use synthetic fibers such as polyacrylonitrile-based materials such as acrylic, and fibers obtained by mixing these synthetic fibers with natural fibers such as cotton and hemp and biodegradable chemical fibers such as viscose rayon. As the fiber composition, a mixture of corrosive fibers 60 to 80% and synthetic fibers 40 to 20% is preferable.

In the above embodiment, the bag body 3 made of interwoven cloth is used.
The pre-corrosion mesh size is set to about 1 to 4 mm ^2, and the non-corrosive fiber b remaining when the pre-corrosive fiber a corrodes
The bag 3b has a mesh size 9 times larger than that before corrosion, but this is an example, and the growth base material 2 to be filled is set so that it does not easily spill out. It is sufficient to set the mesh when the early corrosive fiber a is corroded to be at least twice as large as the mesh before corrosion, preferably 4 to 400 times, more preferably 9 to 50 times. do it. Also, as the growth base material 2, eelgrass seeds and resin-coated fertilizer are mixed with water and sand to form a slurry, but the mixture is not limited to this, and organic bark, peat moss, etc. may be used as needed. It may be added.
Furthermore, as the fertilizer, it is possible to select a fertilizer having an extremely slow-acting high control, which has a fertilizing effect for 2 to 3 years, manufactured by Chisso Asahi Kasei Co., Ltd.

[0013]

As described above, in the method for constructing an eelgrass yard according to the present invention, as a seeding substrate to be settled down in the eelgrass basin formation water body, a bag which grows in mesh due to partial corrosion over time is used as a growth base material. By using the one containing the seeds, it is possible to effectively prevent the loss of the growth base material containing eelgrass seeds, as well as the germination of seeds due to the corrosion of the early corrosive fibers over time. Develops good growth, and the net-like bag remains after the corrosion of premature corrosive fibers, effectively suppressing not only the growth base material but also germination and the loss of eelgrass during development. However, since the long-term maintenance of the growth base and the germination and growth of the eelgrass were successfully achieved, it has become possible to create an eelgrass field accurately in the prescribed water area. Then, by using the seeding substrate according to the present invention, it is possible to preferably carry out the creation of the eelgrass field by the above-mentioned method.

[Brief description of drawings]

FIG. 1 is a perspective view in which a main part of a seeding substrate used for carrying out a method of the first invention is cut away.

FIG. 2 is an explanatory diagram showing a state in which early corrosive fibers corrode and eelgrass propagates.

[Explanation of symbols]

1 ... Seeding substrate, 2 ... Growth base material, 3 ... Bag, 3a ... Net bag, 4 ... Cloth, a ... Early corrosive fiber, b ... Hardly corrosive fiber.

Claims (2)

[Claims] 1. A cloth formed by interweaving an early corrosive fiber and a non-corrosive or non-corrosive fiber, wherein the mesh of the cloth after the early corrosive fiber is corroded is a cloth before corrosion.
As it will be帛eyes fit more than twice, to form the bag body, this
Of the bag body by filling the growing base material comprising seeds of eelgrass form a sowing substrate, further, eelgrass beds method Construction, characterized in that settling laying the seed substrate to the bottom of the water. 2. A net-like cloth formed by interweaving pre -corrosive fibers and non-corrosive or non-corrosive fibers so that the mesh of the cloth after the pre- corroding fibers is corroded is a cloth before corrosion.
As it will be帛eyes fit more than twice, to form the bag body, this
A seeding substrate, which is obtained by filling the bag body of the above with a growth base material containing eelgrass seeds.