JP5992794B2 - Porting method - Google Patents

Description

  The present invention relates to a method for transplanting grass bodies such as aquatic plants and seaweeds.

  Plants such as aquatic plants and seaweeds that grow on the coastal areas of lakes and seas not only serve as spawning grounds for fish and larvae, but also have the function of releasing oxygen and absorbing nutrients in soil. , Play an important role in water purification. In addition, since these densely grow in the coastal area, the bottom sediment stabilization function that prevents the bottom sediment from being rolled up and eroded is also regarded as important.

  However, because of the disappearance of these vegetation zones due to coastal land reclamation and water pollution, technological development of aquatic plants and seagrass transplantation, restoration of lakeside vegetation zones, and the creation of seaweed beds have been proposed. For example, a method has been proposed in which grass is collected together with soil, stored in a container, transported, and buried in a transplant destination. Patent Document 1 discloses a method in which a plant transplant device made of a biodegradable material is installed in the vicinity of a plant community of a transplant source, and after the plant body grows on the plant transplant device, the plant transplant device is installed at the transplant destination together with the plant body. Proposed.

JP 2008-148575 A

  In the method in which the grass is collected together with the soil, stored in a container and transported, the soil may flow out due to waves or the like at the transplantation destination, and the grass body may be less fixed. In the method of Patent Document 1, it may be costly to create a grass transplant device.

  An object of the present invention is to enable transplanting of grasses more simply and at low cost.

  According to the present invention, a plant community collected from the bottom of the transplant source is sandwiched between upper and lower nets to form a transplant, and the transplant is fixed to the transplant bottom and the plant community is grown. And a transplanting step of moving the transplant to the bottom of the transplant destination and fixing it to the bottom of the transplant destination.

  According to the present invention, transplantation of grass can be performed more easily and at low cost.

(A) And (B) is explanatory drawing of the transplanting method which concerns on one Embodiment of this invention. (A) And (B) is explanatory drawing of the transplanting method which concerns on one Embodiment of this invention. (A) And (B) is explanatory drawing of the transplanting method which concerns on one Embodiment of this invention. (A) And (B) is explanatory drawing of the transplanting method which concerns on one Embodiment of this invention. (A) and (B) are tables showing test results.

  A transplanting method according to an embodiment of the present invention will be described with reference to FIGS. Here, although the case where the seaweed of a seabed is transplanted is assumed, this invention is applicable to various transplants of the grassland community which inhabits a waterbed, such as transplanting of aquatic plants, such as a lake bottom.

  The transplanting method of this embodiment is roughly divided into a preparation process shown in FIGS. 1 to 3 and a transplanting process shown in FIG. Hereinafter, the preparation process will be described in order.

  FIG. 1 (A) shows a process of installing a net sheet 3 on the seabed 1 of the transplant source where the seagrass community 2 is regenerating. As the seaweed to be transplanted, it is suitable for seagrass that extends in the rhizome, and examples thereof include sea urchins and sea urchins.

  The net sheet 3 is preferably a biodegradable material net sheet from the viewpoint of disappearance after transplantation, and examples thereof include polylactic acid fibers. In the present embodiment, the mesh sheet 3 is square, but the shape is not limited.

  The mesh size of the mesh sheet 3 is preferably large enough to allow the roots and stems of seaweed to pass through, but is preferably small in terms of reducing soil loss, for example, 0.5 mm to 5 mm. Further, it is preferable that the mesh is easy to spread relatively easily so as not to hinder the growth of seaweed stalks or the like passing through the mesh, and the weave of the mesh sheet 3 is preferably a plain weave such as a woven weave. Furthermore, in the present embodiment, since the work is based on manual work, it is preferable that the net sheet 3 is of a size that can be conveyed by one person or several persons.

  In the case of this embodiment, as will be described later, the net sheet 3 is folded in half so as to sandwich the collected seaweed community 2. The portion 3a of the mesh sheet 3 constitutes a lower mesh body, and the portion 3b constitutes an upper mesh body. The seaweed community 2 to be collected is placed on the portion 3a. Therefore, when installing the net sheet 3 on the seabed 1, it is preferable to install the net sheet 3 as close as possible to the seagrass community 2 to be sampled adjacent to the portion 3a.

  FIG. 1 (B) shows a state where the seagrass community 2 is collected from the seabed 1 together with the soil. The seaweed community 2 can be collected using, for example, a scoop or a transplanting grab, and the whole soil can be collected easily, and the soil can be left attached to the seagrass. Therefore, it becomes possible to promote the growth of seaweed thereafter.

  FIG. 2A shows a state where the collected seaweed community 2 is placed on the portion 3 a of the net sheet 3. After placing an appropriate amount of the virtual community 2 on the portion 3a, the portion 3b is folded with respect to the portion 3a to cover the seagrass community 2 placed on the portion 3a as shown in FIG.

  In this way, a transplant 6 is prepared in which the seagrass community 2 is sandwiched between the upper and lower nets (parts 3a, 3b). In the present embodiment, the transplant 6 is formed by folding one net sheet 3, but the seagrass community 2 may be sandwiched between two net sheets. However, workability is better in the configuration in which one net sheet 3 is folded as in the present embodiment.

  Subsequently, the transplant 6 is fixed to the seabed 1. For example, as shown in FIG. 2 (B), the pin member 5 is driven into the seabed 1 through the upper and lower portions 3a and 3b from the top of the transplant body 6, and the transplant body 6 is inserted into the seabed 1 as shown in FIG. 3 (A). To fix. Thereby, it can prevent that the transplant 6 is washed away by an ocean current.

  Thereafter, the transplant 6 is left on the seabed 1 for a predetermined period, and the seaweed community 2 to be transplanted is grown on the transplant 6. The growing period depends on the type of seaweed and the season, but can be, for example, about several months to one year. As shown in FIG. 3B, the seaweed stems and roots pass through the mesh of the mesh sheet 3 and become entangled with the mesh. Thereby, the fixing property of the seaweed to the net sheet 3 is improved. In addition, soil fixation is improved by the propagation of seaweed in the transplant 6. The preparation process is thus completed, and the process proceeds to the transplantation process.

  First, the pin member 5 is removed to release the fixation of the transplant body 6, and the transplant body 6 is removed from the seabed 1 as shown in FIG. Next, the transplant body 6 is conveyed and moved to the seabed of the transplant destination. When moving to the seabed of the transplant destination, the transplant 6 is fixed to the seabed. FIG. 4B shows a state in which the transplant body 6 is fixed to the seabed 7 of the transplant destination. The transplant body 6 is fixed using the pin member 5 as in the case of fixing on the seabed 1 of the transplant source, but other fixing methods may be used.

  Thus, the transplanting process is also completed. By fixing the transplant body 6 with the pin member 5, it is possible to prevent the transplant body 6 from being washed away by the ocean current. Moreover, since the seaweed community in the transplant body 6 is entangled with the mesh of the net sheet 3, it can also be prevented that the seagrass community is washed away by the ocean current. By creating the net sheet 3 and the pin member 5 from a biodegradable material, the net sheet 3 and the pin member 5 can be eliminated over time.

  As described above, in this embodiment, the operations necessary for relocation are the collection of seaweed communities, placement on the net sheet 3, fixing and transfer of the transplant 6, and seagrass can be transplanted more easily. Moreover, the necessary instruments are the net sheet 3 and the pin member 5 and can transplant seaweed at a lower cost.

  5 (A) and 5 (B) show the test results of seagrass transplantation. FIG. 5 (A) shows the growth of seagrass in the transplant on the seabed of the transplant source. The seabed of the transplant source was set at two points, point A and point B, and three transplants corresponding to the transplant 6 of the above embodiment were fixed at point A and 17 at point B. The coverage means a ratio of covering the net on the surface side of the transplant body (corresponding to the portion 3b in the above embodiment) with the seaweed inside. In other words, the degree of seagrass encapsulated in the transplant grows and passes through the mesh and is exposed to the surface side when the transplant is installed, and is evaluated by visual observation. It is naturally 0% at the time of installation, but it can be seen that the growth is progressing with the passage of time.

  FIG. 5 (B) shows the state of seagrass growth in the transplant on the seabed of the transplant destination. A total of 20 transplants (one year after installation) shown in FIG. 5 (A) were distributed and fixed at three locations C to E, respectively, and their coverage over time was observed. Half a year later, it dropped sharply to 1%. This is because the leaves of seaweeds flowed out because it was just in winter, and the exposed part on the surface side of the transplant was greatly reduced. The growth of rhizomes and roots was fully confirmed. After 1 year and 2 years, the coverage was stable, and it was confirmed that the transplanted seaweed was growing without dying on the seabed of the transplant destination.

Claims (3)

A preparatory step of growing the grass community by fixing the transplant to the water bottom of the transplant source by sandwiching the grass community collected together with the soil from the bottom of the transplant source water into a transplant body,
A transplanting step of moving the transplant to the bottom of the transplant destination and fixing to the bottom of the transplant;
A transplantation method comprising the steps of: The upper and lower nets are obtained by folding one net sheet in two,
In the preparation step,
Of the net sheet, the step of setting the lower part of the transplant adjacent to the plant community to be collected;
Collecting the grassland community with the soil from the bottom of the transplant source, and placing it on the lower part,
Of the net sheet, the step of folding the upper part of the transplant body with respect to the lower part, covering the grassland community placed on the lower part,
The transplantation method of Claim 1 characterized by the above-mentioned. In the preparation step, an operator installs the net body on the bottom of the water, collects a grassland community with soil by a scoop or a transplanting grab, places it on the net body, sandwiches the net body, and fixes it to the bottom of the water. The transplantation method according to claim 1, wherein the transplantation method is performed .

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