JPH1118565A - Planting of plant on flooding slope of dam lake having large variation of water level - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective method for planting a plant on flooding slope of dam lake having large variation of water level. SOLUTION: Seedlings of naturally grown or locally grown plant (e.g. a plant of the family Salicaceae or Equisetaceae or a plant of the genus phragmites) capable of withstanding water immersion for several months are planted on flooding slope 3 so as to enable growth or life support even under drying conditions for several months or longer term by water supply utilizing highly water-absorbing and highly water-retaining material (e.g. polypropylene- based spun-bonded nonwoven fabric) (specifically, by a method absorbing and retaining rain water, ground water or pound water into a highly water-absorbing and highly water retaining material and supplying the absorbed and retained water to plants).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for planting a flooded slope such as a dam lake having a large fluctuation in water level.

[0002]

2. Description of the Related Art In general, water levels of dam lakes and the like caused by dam construction vary drastically, and the lowest water level during a drought period (drought level).
The difference between the water level and the maximum water level (full water level) during the rainy season often reaches 10 to 15 m. However, such flooded slopes such as dam lakes (slopes where flooding and exposure are repeated) are generally used. Because the plants do not grow on the slopes, the slopes become bare strips, which not only damages the landscape around the dam, but also significantly impairs the stability of the slopes, causing surface collapse and surface erosion. It is one of the causes of deterioration of water storage function due to sedimentation.

As a solution to the above problem, it is conceivable to plant trees on flooded slopes. Plants that withstand long-term flooding are vulnerable to drying, and plants that withstand long-term drying are flooding. Because there is no vegetation that is vulnerable to both inundation and drying, flooding where the water level fluctuates greatly and the inundation and drying are repeated at several months level, such as the flooded surface of a dam lake of a multipurpose dam It is very difficult to plant on a slope.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method effective in planting a flooded slope such as a dam lake having a large fluctuation in water level in view of the above-mentioned circumstances.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a method for planting a flooded surface of a dam lake or the like having a large water level fluctuation (hereinafter, simply referred to as a method of the present invention) according to the present invention is a basic method. In addition, on the inundated surface of a dam lake or the like where the water level fluctuates greatly, native or native plants that can withstand water inundation for several months or more (for example, Salixaceae: woody plants, Rhododaceae: ferns, reeds: herbs) ) Using high water-absorbing and highly water-retentive materials (for example, polymer materials such as polypropylene spunbonded nonwoven fabric and aliphatic polyestercarbonate nonwoven fabric, or natural materials) (rainwater and groundwater with high water-absorbing and highly water-retainable materials) , Or by absorbing and retaining pond water and supplying this water to the plants), so that the plants can grow or maintain their life even under dry conditions for several months or more.

The method of the present invention can be applied to both existing flooded slopes, such as dam lakes, and newly constructed flooded slopes, which are expected to be bare. When applying to a slope, planting work will be performed sequentially from the upper part of the flooded slope to the lower part as the water level decreases.

[0007] The method of the present invention is roughly divided into a first method and a second method. In the first method, an appropriate basement is formed on a flooded surface of a dam lake or the like where the water level fluctuates greatly. One or more seedlings of native or native plants that can withstand water immersion for several months or more are wrapped in a highly water-absorbent and highly water-retentive material that has been previously absorbed, and planted on the flooded surface.

In the second method, a suitable basement is formed on a flooded slope of a dam lake or the like where the water level fluctuates greatly, and at least one of a native or native plant that can withstand water inundation for several months or more. Wrap multiple types of seedlings in a highly water-absorbent and highly water-retentive material that has been pre-absorbed, plant them in planting soil in a box-shaped container with a relatively weak bottom, and install this box-shaped container on the flooded surface・ It is fixed.

[0009] In the first method, when the inundation surface is composed mainly of rock or soil poor in water absorption and water retention, a band-like or lattice-like groove is formed in the inundation surface. Insert a high water-absorbing / high water-retentive material into this groove (e.g. lay only a high water-absorbing / high water-retaining material in the groove, sex·
It is preferable to lay a foundation or mix a highly water-retentive material into the planting soil) or to install and fix a highly water-absorbent and highly water-retentive material as a mulching material on the flooded surface. It is convenient to install and fix one end of the water-absorbing / high-water-retention material below the water level, since pond water can be supplied to plants using capillary action.

In the second method, a highly water-absorbing and highly water-retentive material is mixed into the planting soil in the box-shaped container, or a box-shaped container made of the highly water-absorbent and highly water-retainable material is used. It is effective to use.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a flooded surface of a dam lake or the like to which the method of the present invention is applied will be described. In FIG. Is also a drought level, 3 is a flooded surface, and the flooded surface 3 often repeats submergence and exposure at the level of several months, and it is generally difficult for plants to grow.

In the first method of the present invention, the above-mentioned flooded surface 3 is, for example, entirely or in the form of a belt (longitudinal or horizontal direction) or lattice, and is formed by tilling, fertilization, earth retaining, or the like. After the development, select one or more species from among the native or native plants that can withstand the above-mentioned water immersion for several months or more, and have high water absorption and high preservation by pre-absorbing the cuttings or pot seedlings. Aqueous polymer material or natural material (hereinafter, referred to as
It is wrapped with water-absorbing / water-retaining material) and planted on the flooded slope 3 and, if necessary, covered with an appropriate covering material on the exposed slope between the seedlings and mulching.

It should be noted that even if a plant is resistant to water immersion for several months, there is a natural difference in the resistance to water immersion. Naturally, consideration must be given to those that are resistant to water immersion in the lower part of the flooded surface 3.

In the case where the flooded slope 3 to which the first method is applied is mainly made of rock or soil poor in water absorption and water retention and the planting conditions are more severe, for example, the flooded slope 3 may be used. Form a band-shaped or lattice-shaped groove and put a highly water-absorbent / highly water-retentive material in this groove. Lay it with the planting soil, or mix the high water-absorbing and high water-retentive material into the planting soil.) Create a foundation, or use the high water-absorbing and high water-retaining material as a mulching material on the flooded surface 3 It is good to fix.

In the case described above, when one end of the high water-absorbing / highly water-retaining material is installed and fixed below the surface of the water level 2, the water of a dam lake or the like with a water level of 2 or less rises by using the capillary phenomenon. Then, the planted plants can be supplied with water.

Next, in the second method of the present invention, for example, the surface layer of the flooded surface 3 is cultivated over a depth of 10 to 30 cm to form a base, and at least one of the above-mentioned plants 1 to 3 is cultivated. Plural seedlings are wrapped in a water-absorbing / water-retaining material that has been absorbed in advance, and planted in a box-shaped container with a relatively weak bottom so that the roots of the plant can be easily extended. Install and fix on the slope 3.

According to the second method, plant seedlings can be efficiently planted, and a water-absorbing / water-retaining material is mixed into planted soil in a box-shaped container, or a water-absorbing / water-retaining material is used. By using the box-shaped container made,
Water supply to the plant can be further ensured.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a part of a dam lake or the like.

[Explanation of symbols]

 1: water level, 2: drought level, 3: flooded level.

Claims (7)

[Claims] [Claim 1] After appropriately forming a foundation on a flooded slope of a dam lake or the like having a large fluctuation in water level, one or more seedlings of a native or native plant that can withstand flooding for several months or more are obtained. A method of planting a flooded slope such as a dam lake having a large fluctuation in water level, wherein the flooded slope is wrapped with a highly water-absorbent / highly water-retentive material that has been previously absorbed and planted on the flooded slope. 2. When the flooded surface is composed mainly of rock or soil poor in water absorption and water retention, a band-like or lattice-like groove is formed in the flooded surface, and high water absorption is formed in the groove.・
The method for planting a flooded slope of a dam lake or the like according to claim 1, wherein the base is laid by adding a high water retention material. 3. A method for installing and fixing a highly water-absorbing and highly water-retentive material as a mulching material on a flooded surface when the flooded surface is composed mainly of rock or soil poor in water absorption and water retention. 1. The method for planting a flooded slope such as a dam lake having a large fluctuation in water level according to 1. 4. The method for planting a flooded surface of a dam lake or the like having a large fluctuation in water level according to claim 2 or 3, wherein one end of the superabsorbent material and water retention material is installed and fixed below the water level. . 5. An appropriate foundation is formed on a flooded surface of a dam lake or the like having a large fluctuation in water level, and one or more seedlings of native or native plants that can withstand water inundation for several months or more are obtained. Wrapped in high water-absorbing and high water-retentive material,
It is planted in planting soil in a box container with a relatively weak bottom, and this box container is installed and fixed on the flooded surface. Planting method. 6. The method according to claim 5, wherein a highly water-absorbing and highly water-retaining material is mixed into the planting soil in the box-shaped container. 7. The method according to claim 5, wherein a box-shaped container made of a highly water-absorbing and highly water-retentive material is used.