A Case of Utilizing Results

Manual of the slope revegetation method forconservation of regional ecosystem
IIZUKA Yasuo, Senior researcher
OONUKI Makiko, External researcher
KURIHARA Masao, HeadEnvironment Department, Landscape and Ecology Division（Key words）

face of slope，slope revegetation，native species，surface soil，soil seed bank

Application

promotion method
1. Introduction
It is a method to capture those seeds invaded fromOn the slope face that is constructed accompanied bynatural vegetation around through the wind dispersal
development business, afforestation has beenand bird dispersal and expect the vegetation recovery
implemented mainly by using exotic plants to the present,by bud break and settlement of those seeds on thebut there arose a problem of giving bad effect on the local
vegetation mound, which is appropriate in case where
ecological system through partial exotic plants growing
a certain period was allowed to create vegetation. The
outside the slope face.
condition is that target vegetation exists adjacent to theFurther, in an area that has a good natural environment,slope. More specifically, there is a method to locate
it is required to decrease effects on the local ecologicalvegetation mats in order to capture invading seeds
system by utilizing native plants that is the regionality
easily.
system (plant group having a certain commonality in(3) Local seeds and nursery trees use methodgenes).
It is a method to utilize the seeds collected from natural
This guideline is the outline of the method to afforest
vegetation around as well as nursery trees brought up
the slope face by utilizing native plants in the area infrom them, which is appropriate in case where ensuredorder to resolve the problem of exotic plants.
and earlier vegetation was required. The condition is2. Outline of the Manualthat seeds or nursery trees of target vegetation are
As the slope face afforestation method using the local
secured. More specifically, there is a method tonative plants, there are three construction methods such
implements the work through putting collected seeds
as “Surface soil use method,” “Natural invasion
on the vegetation material blow work, planting work ofpromotion method” and “Local seeds and nursery trees
nursery trees, and nursery tree set blow work thatuse method.” (Fig. 1) Each of them is respectively amixed two methods.
method of afforestation utilizing the soil seeds buried in
3. Public announcement of the result
the surface soil of the developed land or seeds or
We have published this result as the TECHNICAL
seeds/nursery trees of the native plants growing in theNOTE of NILIM No.722. We expect that this guideline
developed land, which is a method to create vegetation
contributes to develop a slope face that confronts theappropriate for the targeted afforestation.
denudation and secure and maintain the biodiversity.
(1) Surface soil use method
http://www.nilim.go.jp/lab/ddg/
It is an afforestation method to utilize the soil seeds(Landscape and Ecology Division)
buried in the surface soil, which is appropriate in casewhere earlier afforestation was required. The conditionis that there should be
Surface soil use method
Natural invasion promotion method
Local seeds and nursery trees use method
surface soil containing
Case where earlier afforestation is required. Case where a certain period was allowed to Case where ensured and earlier afforestation isburied seeds of target
T here exists surface soil that contains create vegetation.
required.
buried seeds of afforestation targeted T here exist vegetations of targeted T here exist vegetations around that can secure
vegetation around thevegetation (woofs or field) around the afforestation adjacent to the slope (Seeds seeds and/or nursery trees of the plants of targeted
slope face in question.
slope.
flying in expected).
afforestation.
More specifically, there
Afforestation method that utilizes buried Afforestation method that utilizes those Afforestation method that utilizes seeds and/or
exists a method that
seeds contained in the surface soil.
seeds that naturally invaded from periphery. nursery trees collected in periphery.
collects and stores theWork example of Surface soil + Vegetation Work example of the Vegetation mat Work example of the Local seeds and nursery trees
material blow work
construction
plant construction
surface soil beforehand(Just after the work)(Just after the work)(Just after the work)and after having created(Six years from
(Six years from
(Six years fromcompletion of the work)
completion of the work)
completion of the work)
the slope face, mix thatsoil with the vegetationmaterial and implements
the work through thevegetation material blow
work.
(2)
Naturalinvasion
OutlineFig. 1 Examples of construction works “slope face afforestation method using the local native plants”